Azure IoT
/
azure_uamqp_c
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Dependents: iothub_client_sample_amqp remote_monitoring simplesample_amqp
connection.c
- Committer:
- AzureIoTClient
- Date:
- 2018-10-04
- Revision:
- 47:365a93fdb5bb
- Parent:
- 46:01f7ca900e07
File content as of revision 47:365a93fdb5bb:
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
#include <stdlib.h>
#include <string.h>
#include "azure_c_shared_utility/optimize_size.h"
#include "azure_c_shared_utility/gballoc.h"
#include "azure_c_shared_utility/xio.h"
#include "azure_c_shared_utility/xlogging.h"
#include "azure_c_shared_utility/tickcounter.h"
#include "azure_uamqp_c/connection.h"
#include "azure_uamqp_c/frame_codec.h"
#include "azure_uamqp_c/amqpvalue.h"
#include "azure_uamqp_c/amqp_frame_codec.h"
#include "azure_uamqp_c/amqp_definitions.h"
#include "azure_uamqp_c/amqpvalue_to_string.h"
/* Requirements satisfied by the virtue of implementing the ISO:*/
/* Codes_S_R_S_CONNECTION_01_088: [Any data appearing beyond the protocol header MUST match the version indicated by the protocol header.] */
/* Codes_S_R_S_CONNECTION_01_015: [Implementations SHOULD NOT expect to be able to reuse open TCP sockets after close performatives have been exchanged.] */
/* Codes_S_R_S_CONNECTION_01_087: [The protocol header consists of the upper case ASCII letters "AMQP" followed by a protocol id of zero, followed by three unsigned bytes representing the major, minor, and revision of the protocol version (currently 1 (MAJOR), 0 (MINOR), 0 (REVISION)). In total this is an 8-octet sequence] */
static const unsigned char amqp_header[] = { 'A', 'M', 'Q', 'P', 0, 1, 0, 0 };
typedef enum RECEIVE_FRAME_STATE_TAG
{
RECEIVE_FRAME_STATE_FRAME_SIZE,
RECEIVE_FRAME_STATE_FRAME_DATA
} RECEIVE_FRAME_STATE;
typedef struct ON_CONNECTION_CLOSED_EVENT_SUBSCRIPTION_TAG
{
ON_CONNECTION_CLOSE_RECEIVED on_connection_close_received;
void* context;
} ON_CONNECTION_CLOSED_EVENT_SUBSCRIPTION;
typedef struct ENDPOINT_INSTANCE_TAG
{
uint16_t incoming_channel;
uint16_t outgoing_channel;
ON_ENDPOINT_FRAME_RECEIVED on_endpoint_frame_received;
ON_CONNECTION_STATE_CHANGED on_connection_state_changed;
void* callback_context;
CONNECTION_HANDLE connection;
} ENDPOINT_INSTANCE;
typedef struct CONNECTION_INSTANCE_TAG
{
XIO_HANDLE io;
size_t header_bytes_received;
CONNECTION_STATE connection_state;
FRAME_CODEC_HANDLE frame_codec;
AMQP_FRAME_CODEC_HANDLE amqp_frame_codec;
ENDPOINT_INSTANCE** endpoints;
uint32_t endpoint_count;
char* host_name;
char* container_id;
TICK_COUNTER_HANDLE tick_counter;
uint32_t remote_max_frame_size;
ON_SEND_COMPLETE on_send_complete;
void* on_send_complete_callback_context;
ON_NEW_ENDPOINT on_new_endpoint;
void* on_new_endpoint_callback_context;
ON_CONNECTION_STATE_CHANGED on_connection_state_changed;
void* on_connection_state_changed_callback_context;
ON_IO_ERROR on_io_error;
void* on_io_error_callback_context;
ON_CONNECTION_CLOSED_EVENT_SUBSCRIPTION on_connection_close_received_event_subscription;
/* options */
uint32_t max_frame_size;
uint16_t channel_max;
milliseconds idle_timeout;
milliseconds remote_idle_timeout;
milliseconds remote_idle_timeout_send_frame_millisecond;
double idle_timeout_empty_frame_send_ratio;
tickcounter_ms_t last_frame_received_time;
tickcounter_ms_t last_frame_sent_time;
fields properties;
unsigned int is_underlying_io_open : 1;
unsigned int idle_timeout_specified : 1;
unsigned int is_remote_frame_received : 1;
unsigned int is_trace_on : 1;
} CONNECTION_INSTANCE;
/* Codes_S_R_S_CONNECTION_01_258: [on_connection_state_changed shall be invoked whenever the connection state changes.]*/
static void connection_set_state(CONNECTION_HANDLE connection, CONNECTION_STATE connection_state)
{
uint64_t i;
CONNECTION_STATE previous_state = connection->connection_state;
connection->connection_state = connection_state;
/* Codes_S_R_S_CONNECTION_22_001: [If a connection state changed occurs and a callback is registered the callback shall be called.] */
if (connection->on_connection_state_changed)
{
connection->on_connection_state_changed(connection->on_connection_state_changed_callback_context, connection_state, previous_state);
}
/* Codes_S_R_S_CONNECTION_01_260: [Each endpoint's on_connection_state_changed shall be called.] */
for (i = 0; i < connection->endpoint_count; i++)
{
/* Codes_S_R_S_CONNECTION_01_259: [The callback_context passed in connection_create_endpoint.] */
if (connection->endpoints[i]->on_connection_state_changed != NULL)
{
connection->endpoints[i]->on_connection_state_changed(connection->endpoints[i]->callback_context, connection_state, previous_state);
}
}
}
// This callback usage needs to be either verified and commented or integrated into
// the state machine.
static void unchecked_on_send_complete(void* context, IO_SEND_RESULT send_result)
{
(void)context;
(void)send_result;
}
static int send_header(CONNECTION_HANDLE connection)
{
int result;
/* Codes_S_R_S_CONNECTION_01_093: [_ When the client opens a new socket connection to a server, it MUST send a protocol header with the client's preferred protocol version.] */
/* Codes_S_R_S_CONNECTION_01_104: [Sending the protocol header shall be done by using xio_send.] */
if (xio_send(connection->io, amqp_header, sizeof(amqp_header), unchecked_on_send_complete, NULL) != 0)
{
/* Codes_S_R_S_CONNECTION_01_106: [When sending the protocol header fails, the connection shall be immediately closed.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
/* Codes_S_R_S_CONNECTION_01_057: [END In this state it is illegal for either endpoint to write anything more onto the connection. The connection can be safely closed and discarded.] */
connection_set_state(connection, CONNECTION_STATE_END);
/* Codes_S_R_S_CONNECTION_01_105: [When xio_send fails, connection_dowork shall return a non-zero value.] */
result = __FAILURE__;
}
else
{
if (connection->is_trace_on == 1)
{
LOG(AZ_LOG_TRACE, LOG_LINE, "-> Header (AMQP 0.1.0.0)");
}
/* Codes_S_R_S_CONNECTION_01_041: [HDR SENT In this state the connection header has been sent to the peer but no connection header has been received.] */
connection_set_state(connection, CONNECTION_STATE_HDR_SENT);
result = 0;
}
return result;
}
#ifndef NO_LOGGING
static const char* get_frame_type_as_string(AMQP_VALUE descriptor)
{
const char* result;
if (is_open_type_by_descriptor(descriptor))
{
result = "[OPEN]";
}
else if (is_begin_type_by_descriptor(descriptor))
{
result = "[BEGIN]";
}
else if (is_attach_type_by_descriptor(descriptor))
{
result = "[ATTACH]";
}
else if (is_flow_type_by_descriptor(descriptor))
{
result = "[FLOW]";
}
else if (is_disposition_type_by_descriptor(descriptor))
{
result = "[DISPOSITION]";
}
else if (is_transfer_type_by_descriptor(descriptor))
{
result = "[TRANSFER]";
}
else if (is_detach_type_by_descriptor(descriptor))
{
result = "[DETACH]";
}
else if (is_end_type_by_descriptor(descriptor))
{
result = "[END]";
}
else if (is_close_type_by_descriptor(descriptor))
{
result = "[CLOSE]";
}
else
{
result = "[Unknown]";
}
return result;
}
#endif // NO_LOGGING
static void log_incoming_frame(AMQP_VALUE performative)
{
#ifdef NO_LOGGING
UNUSED(performative);
#else
AMQP_VALUE descriptor = amqpvalue_get_inplace_descriptor(performative);
if (descriptor == NULL)
{
LogError("Error getting performative descriptor");
}
else
{
char* performative_as_string;
LOG(AZ_LOG_TRACE, 0, "<- ");
LOG(AZ_LOG_TRACE, 0, (char*)get_frame_type_as_string(descriptor));
performative_as_string = NULL;
LOG(AZ_LOG_TRACE, LOG_LINE, (performative_as_string = amqpvalue_to_string(performative)));
if (performative_as_string != NULL)
{
free(performative_as_string);
}
}
#endif
}
static void log_outgoing_frame(AMQP_VALUE performative)
{
#ifdef NO_LOGGING
UNUSED(performative);
#else
AMQP_VALUE descriptor = amqpvalue_get_inplace_descriptor(performative);
if (descriptor == NULL)
{
LogError("Error getting performative descriptor");
}
else
{
char* performative_as_string;
LOG(AZ_LOG_TRACE, 0, "-> ");
LOG(AZ_LOG_TRACE, 0, (char*)get_frame_type_as_string(descriptor));
performative_as_string = NULL;
LOG(AZ_LOG_TRACE, LOG_LINE, (performative_as_string = amqpvalue_to_string(performative)));
if (performative_as_string != NULL)
{
free(performative_as_string);
}
}
#endif
}
static void on_bytes_encoded(void* context, const unsigned char* bytes, size_t length, bool encode_complete)
{
CONNECTION_HANDLE connection = (CONNECTION_HANDLE)context;
if (xio_send(connection->io, bytes, length,
(encode_complete && connection->on_send_complete != NULL) ? connection->on_send_complete : unchecked_on_send_complete,
connection->on_send_complete_callback_context) != 0)
{
LogError("Cannot send encoded bytes");
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
}
}
static int send_open_frame(CONNECTION_HANDLE connection)
{
int result;
/* Codes_S_R_S_CONNECTION_01_151: [The connection max_frame_size setting shall be passed down to the frame_codec when the Open frame is sent.] */
if (frame_codec_set_max_frame_size(connection->frame_codec, connection->max_frame_size) != 0)
{
LogError("Cannot set max frame size");
/* Codes_S_R_S_CONNECTION_01_207: [If frame_codec_set_max_frame_size fails the connection shall be closed and the state set to END.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_134: [The container id field shall be filled with the container id specified in connection_create.] */
OPEN_HANDLE open_performative = open_create(connection->container_id);
if (open_performative == NULL)
{
LogError("Cannot create OPEN performative");
/* Codes_S_R_S_CONNECTION_01_208: [If the open frame cannot be constructed, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_137: [The max_frame_size connection setting shall be set in the open frame by using open_set_max_frame_size.] */
if (open_set_max_frame_size(open_performative, connection->max_frame_size) != 0)
{
LogError("Cannot set max frame size");
/* Codes_S_R_S_CONNECTION_01_208: [If the open frame cannot be constructed, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
/* Codes_S_R_S_CONNECTION_01_139: [The channel_max connection setting shall be set in the open frame by using open_set_channel_max.] */
else if (open_set_channel_max(open_performative, connection->channel_max) != 0)
{
LogError("Cannot set max channel");
/* Codes_S_R_S_CONNECTION_01_208: [If the open frame cannot be constructed, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
/* Codes_S_R_S_CONNECTION_01_142: [If no idle_timeout value has been specified, no value shall be stamped in the open frame (no call to open_set_idle_time_out shall be made).] */
else if ((connection->idle_timeout_specified) &&
/* Codes_S_R_S_CONNECTION_01_141: [If idle_timeout has been specified by a call to connection_set_idle_timeout, then that value shall be stamped in the open frame.] */
(open_set_idle_time_out(open_performative, connection->idle_timeout) != 0))
{
/* Codes_S_R_S_CONNECTION_01_208: [If the open frame cannot be constructed, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
/* Codes_S_R_S_CONNECTION_01_136: [If no hostname value has been specified, no value shall be stamped in the open frame (no call to open_set_hostname shall be made).] */
else if ((connection->host_name != NULL) &&
/* Codes_S_R_S_CONNECTION_01_135: [If hostname has been specified by a call to connection_set_hostname, then that value shall be stamped in the open frame.] */
(open_set_hostname(open_performative, connection->host_name) != 0))
{
LogError("Cannot set hostname");
/* Codes_S_R_S_CONNECTION_01_208: [If the open frame cannot be constructed, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
/* Codes_S_R_S_CONNECTION_01_243: [If no properties value has been specified, no value shall be stamped in the open frame (no call to open_set_properties shall be made).] */
else if ((connection->properties != NULL) &&
/* Codes_S_R_S_CONNECTION_01_244: [If properties has been specified by a call to connection_set_properties, then that value shall be stamped in the open frame.] */
(open_set_properties(open_performative, connection->properties) != 0))
{
LogError("Cannot set properties");
/* Codes_S_R_S_CONNECTION_01_208: [If the open frame cannot be constructed, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
else
{
AMQP_VALUE open_performative_value = amqpvalue_create_open(open_performative);
if (open_performative_value == NULL)
{
LogError("Cannot create OPEN AMQP value");
/* Codes_S_R_S_CONNECTION_01_208: [If the open frame cannot be constructed, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_002: [Each AMQP connection begins with an exchange of capabilities and limitations, including the maximum frame size.] */
/* Codes_S_R_S_CONNECTION_01_004: [After establishing or accepting a TCP connection and sending the protocol header, each peer MUST send an open frame before sending any other frames.] */
/* Codes_S_R_S_CONNECTION_01_005: [The open frame describes the capabilities and limits of that peer.] */
/* Codes_S_R_S_CONNECTION_01_205: [Sending the AMQP OPEN frame shall be done by calling amqp_frame_codec_begin_encode_frame with channel number 0, the actual performative payload and 0 as payload_size.] */
/* Codes_S_R_S_CONNECTION_01_006: [The open frame can only be sent on channel 0.] */
connection->on_send_complete = NULL;
connection->on_send_complete_callback_context = NULL;
if (amqp_frame_codec_encode_frame(connection->amqp_frame_codec, 0, open_performative_value, NULL, 0, on_bytes_encoded, connection) != 0)
{
LogError("amqp_frame_codec_encode_frame failed");
/* Codes_S_R_S_CONNECTION_01_206: [If sending the frame fails, the connection shall be closed and state set to END.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
else
{
if (connection->is_trace_on == 1)
{
log_outgoing_frame(open_performative_value);
}
/* Codes_S_R_S_CONNECTION_01_046: [OPEN SENT In this state the connection headers have been exchanged. An open frame has been sent to the peer but no open frame has yet been received.] */
connection_set_state(connection, CONNECTION_STATE_OPEN_SENT);
result = 0;
}
amqpvalue_destroy(open_performative_value);
}
}
open_destroy(open_performative);
}
}
return result;
}
static int send_close_frame(CONNECTION_HANDLE connection, ERROR_HANDLE error_handle)
{
int result;
CLOSE_HANDLE close_performative;
/* Codes_S_R_S_CONNECTION_01_217: [The CLOSE frame shall be constructed by using close_create.] */
close_performative = close_create();
if (close_performative == NULL)
{
LogError("Cannot create close performative");
result = __FAILURE__;
}
else
{
if ((error_handle != NULL) &&
/* Codes_S_R_S_CONNECTION_01_238: [If set, this field indicates that the connection is being closed due to an error condition.] */
(close_set_error(close_performative, error_handle) != 0))
{
LogError("Cannot set error on CLOSE");
result = __FAILURE__;
}
else
{
AMQP_VALUE close_performative_value = amqpvalue_create_close(close_performative);
if (close_performative_value == NULL)
{
LogError("Cannot create AMQP CLOSE performative value");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_215: [Sending the AMQP CLOSE frame shall be done by calling amqp_frame_codec_begin_encode_frame with channel number 0, the actual performative payload and 0 as payload_size.] */
/* Codes_S_R_S_CONNECTION_01_013: [However, implementations SHOULD send it on channel 0] */
connection->on_send_complete = NULL;
connection->on_send_complete_callback_context = NULL;
if (amqp_frame_codec_encode_frame(connection->amqp_frame_codec, 0, close_performative_value, NULL, 0, on_bytes_encoded, connection) != 0)
{
LogError("amqp_frame_codec_encode_frame failed");
result = __FAILURE__;
}
else
{
if (connection->is_trace_on == 1)
{
log_outgoing_frame(close_performative_value);
}
result = 0;
}
amqpvalue_destroy(close_performative_value);
}
}
close_destroy(close_performative);
}
return result;
}
static void close_connection_with_error(CONNECTION_HANDLE connection, const char* condition_value, const char* description, AMQP_VALUE info)
{
ERROR_HANDLE error_handle = error_create(condition_value);
if (error_handle == NULL)
{
/* Codes_S_R_S_CONNECTION_01_214: [If the close frame cannot be constructed or sent, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
}
else
{
/* Codes_S_R_S_CONNECTION_01_219: [The error description shall be set to an implementation defined string.] */
if (error_set_description(error_handle, description) != 0)
{
LogError("Cannot set error description on CLOSE frame");
/* Codes_S_R_S_CONNECTION_01_214: [If the close frame cannot be constructed or sent, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
}
else if ((info != NULL) &&
(error_set_info(error_handle, info) != 0))
{
LogError("Cannot set error info on CLOSE frame");
/* Codes_S_R_S_CONNECTION_01_214: [If the close frame cannot be constructed or sent, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
}
else if (send_close_frame(connection, error_handle) != 0)
{
LogError("Cannot send CLOSE frame");
/* Codes_S_R_S_CONNECTION_01_214: [If the close frame cannot be constructed or sent, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
}
else
{
/* Codes_S_R_S_CONNECTION_01_213: [When passing the bytes to frame_codec fails, a CLOSE frame shall be sent and the state shall be set to DISCARDING.] */
/* Codes_S_R_S_CONNECTION_01_055: [DISCARDING The DISCARDING state is a variant of the CLOSE SENT state where the close is triggered by an error.] */
/* Codes_S_R_S_CONNECTION_01_010: [After writing this frame the peer SHOULD continue to read from the connection until it receives the partner's close frame ] */
connection_set_state(connection, CONNECTION_STATE_DISCARDING);
}
error_destroy(error_handle);
}
}
static ENDPOINT_INSTANCE* find_session_endpoint_by_outgoing_channel(CONNECTION_HANDLE connection, uint16_t outgoing_channel)
{
uint32_t i;
ENDPOINT_INSTANCE* result;
for (i = 0; i < connection->endpoint_count; i++)
{
if (connection->endpoints[i]->outgoing_channel == outgoing_channel)
{
break;
}
}
if (i == connection->endpoint_count)
{
LogError("Cannot find session endpoint for channel %u", (unsigned int)outgoing_channel);
result = NULL;
}
else
{
result = connection->endpoints[i];
}
return result;
}
static ENDPOINT_INSTANCE* find_session_endpoint_by_incoming_channel(CONNECTION_HANDLE connection, uint16_t incoming_channel)
{
uint32_t i;
ENDPOINT_INSTANCE* result;
for (i = 0; i < connection->endpoint_count; i++)
{
if (connection->endpoints[i]->incoming_channel == incoming_channel)
{
break;
}
}
if (i == connection->endpoint_count)
{
LogError("Cannot find session endpoint for channel %u", (unsigned int)incoming_channel);
result = NULL;
}
else
{
result = connection->endpoints[i];
}
return result;
}
static int connection_byte_received(CONNECTION_HANDLE connection, unsigned char b)
{
int result;
switch (connection->connection_state)
{
default:
LogError("Unknown connection state: %d", (int)connection->connection_state);
result = __FAILURE__;
break;
/* Codes_S_R_S_CONNECTION_01_039: [START In this state a connection exists, but nothing has been sent or received. This is the state an implementation would be in immediately after performing a socket connect or socket accept.] */
case CONNECTION_STATE_START:
/* Codes_S_R_S_CONNECTION_01_041: [HDR SENT In this state the connection header has been sent to the peer but no connection header has been received.] */
case CONNECTION_STATE_HDR_SENT:
if (b != amqp_header[connection->header_bytes_received])
{
/* Codes_S_R_S_CONNECTION_01_089: [If the incoming and outgoing protocol headers do not match, both peers MUST close their outgoing stream] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
else
{
connection->header_bytes_received++;
if (connection->header_bytes_received == sizeof(amqp_header))
{
if (connection->is_trace_on == 1)
{
LOG(AZ_LOG_TRACE, LOG_LINE, "<- Header (AMQP 0.1.0.0)");
}
connection_set_state(connection, CONNECTION_STATE_HDR_EXCH);
if (send_open_frame(connection) != 0)
{
LogError("Cannot send open frame");
connection_set_state(connection, CONNECTION_STATE_END);
}
}
result = 0;
}
break;
/* Codes_S_R_S_CONNECTION_01_040: [HDR RCVD In this state the connection header has been received from the peer but a connection header has not been sent.] */
case CONNECTION_STATE_HDR_RCVD:
/* Codes_S_R_S_CONNECTION_01_042: [HDR EXCH In this state the connection header has been sent to the peer and a connection header has been received from the peer.] */
/* we should not really get into this state, but just in case, we would treat that in the same way as HDR_RCVD */
case CONNECTION_STATE_HDR_EXCH:
/* Codes_S_R_S_CONNECTION_01_045: [OPEN RCVD In this state the connection headers have been exchanged. An open frame has been received from the peer but an open frame has not been sent.] */
case CONNECTION_STATE_OPEN_RCVD:
/* Codes_S_R_S_CONNECTION_01_046: [OPEN SENT In this state the connection headers have been exchanged. An open frame has been sent to the peer but no open frame has yet been received.] */
case CONNECTION_STATE_OPEN_SENT:
/* Codes_S_R_S_CONNECTION_01_048: [OPENED In this state the connection header and the open frame have been both sent and received.] */
case CONNECTION_STATE_OPENED:
/* Codes_S_R_S_CONNECTION_01_212: [After the initial handshake has been done all bytes received from the io instance shall be passed to the frame_codec for decoding by calling frame_codec_receive_bytes.] */
if (frame_codec_receive_bytes(connection->frame_codec, &b, 1) != 0)
{
LogError("Cannot process received bytes");
/* Codes_S_R_S_CONNECTION_01_218: [The error amqp:internal-error shall be set in the error.condition field of the CLOSE frame.] */
/* Codes_S_R_S_CONNECTION_01_219: [The error description shall be set to an implementation defined string.] */
close_connection_with_error(connection, "amqp:internal-error", "connection_byte_received::frame_codec_receive_bytes failed", NULL);
result = __FAILURE__;
}
else
{
result = 0;
}
break;
}
return result;
}
static void connection_on_bytes_received(void* context, const unsigned char* buffer, size_t size)
{
size_t i;
for (i = 0; i < size; i++)
{
if (connection_byte_received((CONNECTION_HANDLE)context, buffer[i]) != 0)
{
LogError("Cannot process received bytes");
break;
}
}
}
static void connection_on_io_open_complete(void* context, IO_OPEN_RESULT io_open_result)
{
CONNECTION_HANDLE connection = (CONNECTION_HANDLE)context;
if (io_open_result == IO_OPEN_OK)
{
/* Codes_S_R_S_CONNECTION_01_084: [The connection_instance state machine implementing the protocol requirements shall be run as part of connection_dowork.] */
switch (connection->connection_state)
{
default:
LogError("Unknown connection state: %d", (int)connection->connection_state);
break;
case CONNECTION_STATE_START:
/* Codes_S_R_S_CONNECTION_01_086: [Prior to sending any frames on a connection_instance, each peer MUST start by sending a protocol header that indicates the protocol version used on the connection_instance.] */
/* Codes_S_R_S_CONNECTION_01_091: [The AMQP peer which acted in the role of the TCP client (i.e. the peer that actively opened the connection_instance) MUST immediately send its outgoing protocol header on establishment of the TCP connection_instance.] */
if (send_header(connection) != 0)
{
LogError("Cannot send header");
}
break;
case CONNECTION_STATE_HDR_SENT:
case CONNECTION_STATE_OPEN_SENT:
case CONNECTION_STATE_OPENED:
break;
case CONNECTION_STATE_HDR_EXCH:
/* Codes_S_R_S_CONNECTION_01_002: [Each AMQP connection_instance begins with an exchange of capabilities and limitations, including the maximum frame size.] */
/* Codes_S_R_S_CONNECTION_01_004: [After establishing or accepting a TCP connection_instance and sending the protocol header, each peer MUST send an open frame before sending any other frames.] */
/* Codes_S_R_S_CONNECTION_01_005: [The open frame describes the capabilities and limits of that peer.] */
if (send_open_frame(connection) != 0)
{
LogError("Cannot send OPEN frame");
connection_set_state(connection, CONNECTION_STATE_END);
}
break;
case CONNECTION_STATE_OPEN_RCVD:
break;
}
}
else
{
connection_set_state(connection, CONNECTION_STATE_END);
}
}
static void connection_on_io_error(void* context)
{
CONNECTION_HANDLE connection = (CONNECTION_HANDLE)context;
/* Codes_S_R_S_CONNECTION_22_005: [If the io notifies the connection instance of an IO_STATE_ERROR state and an io error callback is registered, the connection shall call the registered callback.] */
if (connection->on_io_error)
{
connection->on_io_error(connection->on_io_error_callback_context);
}
if (connection->connection_state != CONNECTION_STATE_END)
{
/* Codes_S_R_S_CONNECTION_01_202: [If the io notifies the connection instance of an IO_STATE_ERROR state the connection shall be closed and the state set to END.] */
connection_set_state(connection, CONNECTION_STATE_ERROR);
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
}
}
static void on_empty_amqp_frame_received(void* context, uint16_t channel)
{
CONNECTION_HANDLE connection = (CONNECTION_HANDLE)context;
/* It does not matter on which channel we received the frame */
(void)channel;
if (connection->is_trace_on == 1)
{
LOG(AZ_LOG_TRACE, LOG_LINE, "<- Empty frame");
}
if (tickcounter_get_current_ms(connection->tick_counter, &connection->last_frame_received_time) != 0)
{
LogError("Cannot get tickcounter value");
}
}
static void on_amqp_frame_received(void* context, uint16_t channel, AMQP_VALUE performative, const unsigned char* payload_bytes, uint32_t payload_size)
{
CONNECTION_HANDLE connection = (CONNECTION_HANDLE)context;
(void)channel;
if (tickcounter_get_current_ms(connection->tick_counter, &connection->last_frame_received_time) != 0)
{
LogError("Cannot get tickcounter value");
close_connection_with_error(connection, "amqp:internal-error", "cannot get current tick count", NULL);
}
else
{
if (connection->is_underlying_io_open)
{
switch (connection->connection_state)
{
default:
if (performative == NULL)
{
/* Codes_S_R_S_CONNECTION_01_223: [If the on_endpoint_frame_received is called with a NULL performative then the connection shall be closed with the error condition amqp:internal-error and an implementation defined error description.] */
close_connection_with_error(connection, "amqp:internal-error", "connection_endpoint_frame_received::NULL performative", NULL);
LogError("connection_endpoint_frame_received::NULL performative");
}
else
{
AMQP_VALUE descriptor = amqpvalue_get_inplace_descriptor(performative);
if (connection->is_trace_on == 1)
{
log_incoming_frame(performative);
}
if (is_open_type_by_descriptor(descriptor))
{
if (channel != 0)
{
/* Codes_S_R_S_CONNECTION_01_006: [The open frame can only be sent on channel 0.] */
/* Codes_S_R_S_CONNECTION_01_222: [If an Open frame is received in a manner violating the ISO specification, the connection shall be closed with condition amqp:not-allowed and description being an implementation defined string.] */
close_connection_with_error(connection, "amqp:not-allowed", "OPEN frame received on a channel that is not 0", NULL);
LogError("OPEN frame received on a channel that is not 0");
}
if (connection->connection_state == CONNECTION_STATE_OPENED)
{
/* Codes_S_R_S_CONNECTION_01_239: [If an Open frame is received in the Opened state the connection shall be closed with condition amqp:illegal-state and description being an implementation defined string.] */
close_connection_with_error(connection, "amqp:illegal-state", "OPEN frame received in the OPENED state", NULL);
LogError("OPEN frame received in the OPENED state");
}
else if ((connection->connection_state == CONNECTION_STATE_OPEN_SENT) ||
(connection->connection_state == CONNECTION_STATE_HDR_EXCH))
{
OPEN_HANDLE open_handle;
if (amqpvalue_get_open(performative, &open_handle) != 0)
{
/* Codes_S_R_S_CONNECTION_01_143: [If any of the values in the received open frame are invalid then the connection shall be closed.] */
/* Codes_S_R_S_CONNECTION_01_220: [The error amqp:invalid-field shall be set in the error.condition field of the CLOSE frame.] */
close_connection_with_error(connection, "amqp:invalid-field", "connection_endpoint_frame_received::failed parsing OPEN frame", NULL);
LogError("connection_endpoint_frame_received::failed parsing OPEN frame");
}
else
{
if (open_get_idle_time_out(open_handle, &connection->remote_idle_timeout) == 0)
{
/* since we obtained the remote_idle_timeout, compute at what millisecond we should send the empty frame */
connection->remote_idle_timeout_send_frame_millisecond = (milliseconds)(connection->idle_timeout_empty_frame_send_ratio * connection->remote_idle_timeout);
}
if ((open_get_max_frame_size(open_handle, &connection->remote_max_frame_size) != 0) ||
/* Codes_S_R_S_CONNECTION_01_167: [Both peers MUST accept frames of up to 512 (MIN-MAX-FRAME-SIZE) octets.] */
(connection->remote_max_frame_size < 512))
{
/* Codes_S_R_S_CONNECTION_01_143: [If any of the values in the received open frame are invalid then the connection shall be closed.] */
/* Codes_S_R_S_CONNECTION_01_220: [The error amqp:invalid-field shall be set in the error.condition field of the CLOSE frame.] */
close_connection_with_error(connection, "amqp:invalid-field", "connection_endpoint_frame_received::failed parsing OPEN frame", NULL);
LogError("connection_endpoint_frame_received::failed parsing OPEN frame");
}
else
{
if (connection->connection_state == CONNECTION_STATE_OPEN_SENT)
{
connection_set_state(connection, CONNECTION_STATE_OPENED);
}
else
{
if (send_open_frame(connection) != 0)
{
connection_set_state(connection, CONNECTION_STATE_END);
}
else
{
connection_set_state(connection, CONNECTION_STATE_OPENED);
}
}
}
open_destroy(open_handle);
}
}
else
{
/* do nothing for now ... */
}
}
else if (is_close_type_by_descriptor(descriptor))
{
/* Codes_S_R_S_CONNECTION_01_242: [The connection module shall accept CLOSE frames even if they have extra payload bytes besides the Close performative.] */
/* Codes_S_R_S_CONNECTION_01_225: [HDR_RCVD HDR OPEN] */
if ((connection->connection_state == CONNECTION_STATE_HDR_RCVD) ||
/* Codes_S_R_S_CONNECTION_01_227: [HDR_EXCH OPEN OPEN] */
(connection->connection_state == CONNECTION_STATE_HDR_EXCH) ||
/* Codes_S_R_S_CONNECTION_01_228: [OPEN_RCVD OPEN *] */
(connection->connection_state == CONNECTION_STATE_OPEN_RCVD) ||
/* Codes_S_R_S_CONNECTION_01_235: [CLOSE_SENT - * TCP Close for Write] */
(connection->connection_state == CONNECTION_STATE_CLOSE_SENT) ||
/* Codes_S_R_S_CONNECTION_01_236: [DISCARDING - * TCP Close for Write] */
(connection->connection_state == CONNECTION_STATE_DISCARDING))
{
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
}
else
{
CLOSE_HANDLE close_handle;
/* Codes_S_R_S_CONNECTION_01_012: [A close frame MAY be received on any channel up to the maximum channel number negotiated in open.] */
if (channel > connection->channel_max)
{
close_connection_with_error(connection, "amqp:invalid-field", "connection_endpoint_frame_received::failed parsing CLOSE frame", NULL);
LogError("connection_endpoint_frame_received::failed parsing CLOSE frame");
}
else
{
if (amqpvalue_get_close(performative, &close_handle) != 0)
{
close_connection_with_error(connection, "amqp:invalid-field", "connection_endpoint_frame_received::failed parsing CLOSE frame", NULL);
LogError("connection_endpoint_frame_received::failed parsing CLOSE frame");
}
else
{
ERROR_HANDLE error;
if (close_get_error(close_handle, &error) != 0)
{
error = NULL;
}
close_destroy(close_handle);
connection_set_state(connection, CONNECTION_STATE_CLOSE_RCVD);
if (send_close_frame(connection, NULL) != 0)
{
LogError("Cannot send CLOSE frame");
}
/* Codes_S_R_S_CONNECTION_01_214: [If the close frame cannot be constructed or sent, the connection shall be closed and set to the END state.] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
if (connection->on_connection_close_received_event_subscription.on_connection_close_received != NULL)
{
connection->on_connection_close_received_event_subscription.on_connection_close_received(connection->on_connection_close_received_event_subscription.context, error);
}
error_destroy(error);
}
}
}
}
else
{
uint64_t performative_ulong;
if (amqpvalue_get_ulong(descriptor, &performative_ulong) != 0)
{
LogError("Failed getting ulong amqp performative");
}
else
{
switch (performative_ulong)
{
default:
LogError("Bad performative: %02x", performative);
break;
case AMQP_BEGIN:
{
BEGIN_HANDLE begin;
if (amqpvalue_get_begin(performative, &begin) != 0)
{
LogError("Cannot get begin performative");
}
else
{
uint16_t remote_channel;
ENDPOINT_HANDLE new_endpoint = NULL;
bool remote_begin = false;
if (begin_get_remote_channel(begin, &remote_channel) != 0)
{
remote_begin = true;
if (connection->on_new_endpoint != NULL)
{
new_endpoint = connection_create_endpoint(connection);
if (!connection->on_new_endpoint(connection->on_new_endpoint_callback_context, new_endpoint))
{
connection_destroy_endpoint(new_endpoint);
new_endpoint = NULL;
}
}
}
if (!remote_begin)
{
ENDPOINT_INSTANCE* session_endpoint = find_session_endpoint_by_outgoing_channel(connection, remote_channel);
if (session_endpoint == NULL)
{
LogError("Cannot create session endpoint");
}
else
{
session_endpoint->incoming_channel = channel;
session_endpoint->on_endpoint_frame_received(session_endpoint->callback_context, performative, payload_size, payload_bytes);
}
}
else
{
if (new_endpoint != NULL)
{
new_endpoint->incoming_channel = channel;
new_endpoint->on_endpoint_frame_received(new_endpoint->callback_context, performative, payload_size, payload_bytes);
}
}
begin_destroy(begin);
}
break;
}
case AMQP_FLOW:
case AMQP_TRANSFER:
case AMQP_DISPOSITION:
case AMQP_END:
case AMQP_ATTACH:
case AMQP_DETACH:
{
ENDPOINT_INSTANCE* session_endpoint = find_session_endpoint_by_incoming_channel(connection, channel);
if (session_endpoint == NULL)
{
LogError("Cannot find session endpoint for channel %u", (unsigned int)channel);
}
else
{
session_endpoint->on_endpoint_frame_received(session_endpoint->callback_context, performative, payload_size, payload_bytes);
}
break;
}
}
}
}
}
break;
case CONNECTION_STATE_START:
/* Codes_S_R_S_CONNECTION_01_224: [START HDR HDR] */
case CONNECTION_STATE_HDR_SENT:
/* Codes_S_R_S_CONNECTION_01_226: [HDR_SENT OPEN HDR] */
case CONNECTION_STATE_OPEN_PIPE:
/* Codes_S_R_S_CONNECTION_01_230: [OPEN_PIPE ** HDR] */
case CONNECTION_STATE_OC_PIPE:
/* Codes_S_R_S_CONNECTION_01_232: [OC_PIPE - HDR TCP Close for Write] */
case CONNECTION_STATE_CLOSE_RCVD:
/* Codes_S_R_S_CONNECTION_01_234: [CLOSE_RCVD * - TCP Close for Read] */
case CONNECTION_STATE_END:
/* Codes_S_R_S_CONNECTION_01_237: [END - - TCP Close] */
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
break;
}
}
}
}
static void frame_codec_error(void* context)
{
/* Bug: some error handling should happen here
Filed: uAMQP: frame_codec error and amqp_frame_codec_error should handle the errors */
LogError("A frame_codec_error occured");
(void)context;
}
static void amqp_frame_codec_error(void* context)
{
/* Bug: some error handling should happen here
Filed: uAMQP: frame_codec error and amqp_frame_codec_error should handle the errors */
LogError("An amqp_frame_codec_error occured");
(void)context;
}
/* Codes_S_R_S_CONNECTION_01_001: [connection_create shall open a new connection to a specified host/port.] */
CONNECTION_HANDLE connection_create(XIO_HANDLE xio, const char* hostname, const char* container_id, ON_NEW_ENDPOINT on_new_endpoint, void* callback_context)
{
return connection_create2(xio, hostname, container_id, on_new_endpoint, callback_context, NULL, NULL, NULL, NULL);
}
/* Codes_S_R_S_CONNECTION_01_001: [connection_create shall open a new connection to a specified host/port.] */
/* Codes_S_R_S_CONNECTION_22_002: [connection_create shall allow registering connections state and io error callbacks.] */
CONNECTION_HANDLE connection_create2(XIO_HANDLE xio, const char* hostname, const char* container_id, ON_NEW_ENDPOINT on_new_endpoint, void* callback_context, ON_CONNECTION_STATE_CHANGED on_connection_state_changed, void* on_connection_state_changed_context, ON_IO_ERROR on_io_error, void* on_io_error_context)
{
CONNECTION_HANDLE connection;
if ((xio == NULL) ||
(container_id == NULL))
{
/* Codes_S_R_S_CONNECTION_01_071: [If xio or container_id is NULL, connection_create shall return NULL.] */
LogError("Bad arguments: xio = %p, container_id = %p",
xio, container_id);
connection = NULL;
}
else
{
connection = (CONNECTION_HANDLE)malloc(sizeof(CONNECTION_INSTANCE));
/* Codes_S_R_S_CONNECTION_01_081: [If allocating the memory for the connection fails then connection_create shall return NULL.] */
if (connection == NULL)
{
LogError("Cannot allocate memory for connection");
}
else
{
connection->io = xio;
/* Codes_S_R_S_CONNECTION_01_082: [connection_create shall allocate a new frame_codec instance to be used for frame encoding/decoding.] */
connection->frame_codec = frame_codec_create(frame_codec_error, connection);
if (connection->frame_codec == NULL)
{
/* Codes_S_R_S_CONNECTION_01_083: [If frame_codec_create fails then connection_create shall return NULL.] */
LogError("Cannot create frame_codec");
free(connection);
connection = NULL;
}
else
{
connection->amqp_frame_codec = amqp_frame_codec_create(connection->frame_codec, on_amqp_frame_received, on_empty_amqp_frame_received, amqp_frame_codec_error, connection);
if (connection->amqp_frame_codec == NULL)
{
/* Codes_S_R_S_CONNECTION_01_108: [If amqp_frame_codec_create fails, connection_create shall return NULL.] */
LogError("Cannot create amqp_frame_codec");
frame_codec_destroy(connection->frame_codec);
free(connection);
connection = NULL;
}
else
{
if (hostname != NULL)
{
size_t hostname_length = strlen(hostname);
connection->host_name = (char*)malloc(hostname_length + 1);
if (connection->host_name == NULL)
{
/* Codes_S_R_S_CONNECTION_01_081: [If allocating the memory for the connection fails then connection_create shall return NULL.] */
LogError("Cannot allocate memory for host name");
amqp_frame_codec_destroy(connection->amqp_frame_codec);
frame_codec_destroy(connection->frame_codec);
free(connection);
connection = NULL;
}
else
{
(void)memcpy(connection->host_name, hostname, hostname_length + 1);
}
}
else
{
connection->host_name = NULL;
}
if (connection != NULL)
{
size_t container_id_length = strlen(container_id);
connection->container_id = (char*)malloc(container_id_length + 1);
if (connection->container_id == NULL)
{
/* Codes_S_R_S_CONNECTION_01_081: [If allocating the memory for the connection fails then connection_create shall return NULL.] */
LogError("Cannot allocate memory for container_id");
free(connection->host_name);
amqp_frame_codec_destroy(connection->amqp_frame_codec);
frame_codec_destroy(connection->frame_codec);
free(connection);
connection = NULL;
}
else
{
connection->tick_counter = tickcounter_create();
if (connection->tick_counter == NULL)
{
LogError("Cannot create tick counter");
free(connection->container_id);
free(connection->host_name);
amqp_frame_codec_destroy(connection->amqp_frame_codec);
frame_codec_destroy(connection->frame_codec);
free(connection);
connection = NULL;
}
else
{
(void)memcpy(connection->container_id, container_id, container_id_length + 1);
/* Codes_S_R_S_CONNECTION_01_173: [<field name="max-frame-size" type="uint" default="4294967295"/>] */
connection->max_frame_size = 4294967295u;
/* Codes: [<field name="channel-max" type="ushort" default="65535"/>] */
connection->channel_max = 65535;
/* Codes_S_R_S_CONNECTION_01_175: [<field name="idle-time-out" type="milliseconds"/>] */
/* Codes_S_R_S_CONNECTION_01_192: [A value of zero is the same as if it was not set (null).] */
connection->idle_timeout = 0;
connection->remote_idle_timeout = 0;
connection->remote_idle_timeout_send_frame_millisecond = 0;
connection->idle_timeout_empty_frame_send_ratio = 0.5;
connection->endpoint_count = 0;
connection->endpoints = NULL;
connection->header_bytes_received = 0;
connection->is_remote_frame_received = 0;
connection->properties = NULL;
connection->is_underlying_io_open = 0;
connection->remote_max_frame_size = 512;
connection->is_trace_on = 0;
/* Mark that settings have not yet been set by the user */
connection->idle_timeout_specified = 0;
connection->on_new_endpoint = on_new_endpoint;
connection->on_new_endpoint_callback_context = callback_context;
connection->on_connection_close_received_event_subscription.on_connection_close_received = NULL;
connection->on_connection_close_received_event_subscription.context = NULL;
connection->on_io_error = on_io_error;
connection->on_io_error_callback_context = on_io_error_context;
connection->on_connection_state_changed = on_connection_state_changed;
connection->on_connection_state_changed_callback_context = on_connection_state_changed_context;
if (tickcounter_get_current_ms(connection->tick_counter, &connection->last_frame_received_time) != 0)
{
LogError("Could not retrieve time for last frame received time");
tickcounter_destroy(connection->tick_counter);
free(connection->container_id);
free(connection->host_name);
amqp_frame_codec_destroy(connection->amqp_frame_codec);
frame_codec_destroy(connection->frame_codec);
free(connection);
connection = NULL;
}
else
{
connection->last_frame_sent_time = connection->last_frame_received_time;
/* Codes_S_R_S_CONNECTION_01_072: [When connection_create succeeds, the state of the connection shall be CONNECTION_STATE_START.] */
connection_set_state(connection, CONNECTION_STATE_START);
}
}
}
}
}
}
}
}
return connection;
}
void connection_destroy(CONNECTION_HANDLE connection)
{
/* Codes_S_R_S_CONNECTION_01_079: [If handle is NULL, connection_destroy shall do nothing.] */
if (connection == NULL)
{
LogError("NULL connection");
}
else
{
/* Codes_S_R_S_CONNECTION_01_073: [connection_destroy shall free all resources associated with a connection.] */
if (connection->is_underlying_io_open)
{
(void)connection_close(connection, NULL, NULL, NULL);
}
amqp_frame_codec_destroy(connection->amqp_frame_codec);
frame_codec_destroy(connection->frame_codec);
tickcounter_destroy(connection->tick_counter);
if (connection->properties != NULL)
{
amqpvalue_destroy(connection->properties);
}
free(connection->host_name);
free(connection->container_id);
/* Codes_S_R_S_CONNECTION_01_074: [connection_destroy shall close the socket connection.] */
free(connection);
}
}
int connection_open(CONNECTION_HANDLE connection)
{
int result;
if (connection == NULL)
{
LogError("NULL connection");
result = __FAILURE__;
}
else
{
if (!connection->is_underlying_io_open)
{
if (xio_open(connection->io, connection_on_io_open_complete, connection, connection_on_bytes_received, connection, connection_on_io_error, connection) != 0)
{
LogError("Opening the underlying IO failed");
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
else
{
connection->is_underlying_io_open = 1;
connection_set_state(connection, CONNECTION_STATE_START);
result = 0;
}
}
else
{
result = 0;
}
}
return result;
}
int connection_listen(CONNECTION_HANDLE connection)
{
int result;
if (connection == NULL)
{
LogError("NULL connection");
result = __FAILURE__;
}
else
{
if (!connection->is_underlying_io_open)
{
if (xio_open(connection->io, connection_on_io_open_complete, connection, connection_on_bytes_received, connection, connection_on_io_error, connection) != 0)
{
LogError("Opening the underlying IO failed");
connection_set_state(connection, CONNECTION_STATE_END);
result = __FAILURE__;
}
else
{
connection->is_underlying_io_open = 1;
connection_set_state(connection, CONNECTION_STATE_HDR_EXCH);
result = 0;
}
}
else
{
result = 0;
}
}
return result;
}
int connection_close(CONNECTION_HANDLE connection, const char* condition_value, const char* description, AMQP_VALUE info)
{
int result;
if (connection == NULL)
{
LogError("NULL connection");
result = __FAILURE__;
}
else if ((info != NULL) &&
(amqpvalue_get_type(info) != AMQP_TYPE_MAP) &&
(amqpvalue_get_type(info) != AMQP_TYPE_NULL))
{
LogError("Invalid info, expected a map");
result = __FAILURE__;
}
else
{
if (condition_value != NULL)
{
close_connection_with_error(connection, condition_value, description, info);
}
else
{
if (send_close_frame(connection, NULL) != 0)
{
LogError("Sending CLOSE frame failed");
}
connection_set_state(connection, CONNECTION_STATE_END);
}
if (xio_close(connection->io, NULL, NULL) != 0)
{
LogError("xio_close failed");
}
connection->is_underlying_io_open = 1;
result = 0;
}
return result;
}
int connection_set_max_frame_size(CONNECTION_HANDLE connection, uint32_t max_frame_size)
{
int result;
/* Codes_S_R_S_CONNECTION_01_163: [If connection is NULL, connection_set_max_frame_size shall fail and return a non-zero value.] */
if (connection == NULL)
{
LogError("NULL connection");
result = __FAILURE__;
}
/* Codes_S_R_S_CONNECTION_01_150: [If the max_frame_size is invalid then connection_set_max_frame_size shall fail and return a non-zero value.] */
/* Codes_S_R_S_CONNECTION_01_167: [Both peers MUST accept frames of up to 512 (MIN-MAX-FRAME-SIZE) octets.] */
else if (max_frame_size < 512)
{
LogError("max_frame_size too small");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_157: [If connection_set_max_frame_size is called after the initial Open frame has been sent, it shall fail and return a non-zero value.] */
if (connection->connection_state != CONNECTION_STATE_START)
{
LogError("Connection already open");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_148: [connection_set_max_frame_size shall set the max_frame_size associated with a connection.] */
/* Codes_S_R_S_CONNECTION_01_164: [If connection_set_max_frame_size fails, the previous max_frame_size setting shall be retained.] */
connection->max_frame_size = max_frame_size;
/* Codes_S_R_S_CONNECTION_01_149: [On success connection_set_max_frame_size shall return 0.] */
result = 0;
}
}
return result;
}
int connection_get_max_frame_size(CONNECTION_HANDLE connection, uint32_t* max_frame_size)
{
int result;
/* Codes_S_R_S_CONNECTION_01_170: [If connection or max_frame_size is NULL, connection_get_max_frame_size shall fail and return a non-zero value.] */
if ((connection == NULL) ||
(max_frame_size == NULL))
{
LogError("Bad arguments: connection = %p, max_frame_size = %p",
connection, max_frame_size);
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_168: [connection_get_max_frame_size shall return in the max_frame_size argument the current max frame size setting.] */
*max_frame_size = connection->max_frame_size;
/* Codes_S_R_S_CONNECTION_01_169: [On success, connection_get_max_frame_size shall return 0.] */
result = 0;
}
return result;
}
int connection_set_channel_max(CONNECTION_HANDLE connection, uint16_t channel_max)
{
int result;
/* Codes_S_R_S_CONNECTION_01_181: [If connection is NULL then connection_set_channel_max shall fail and return a non-zero value.] */
if (connection == NULL)
{
LogError("NULL connection");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_156: [If connection_set_channel_max is called after the initial Open frame has been sent, it shall fail and return a non-zero value.] */
if (connection->connection_state != CONNECTION_STATE_START)
{
LogError("Connection already open");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_153: [connection_set_channel_max shall set the channel_max associated with a connection.] */
/* Codes_S_R_S_CONNECTION_01_165: [If connection_set_channel_max fails, the previous channel_max setting shall be retained.] */
connection->channel_max = channel_max;
/* Codes_S_R_S_CONNECTION_01_154: [On success connection_set_channel_max shall return 0.] */
result = 0;
}
}
return result;
}
int connection_get_channel_max(CONNECTION_HANDLE connection, uint16_t* channel_max)
{
int result;
/* Codes_S_R_S_CONNECTION_01_184: [If connection or channel_max is NULL, connection_get_channel_max shall fail and return a non-zero value.] */
if ((connection == NULL) ||
(channel_max == NULL))
{
LogError("Bad arguments: connection = %p, channel_max = %p",
connection, channel_max);
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_182: [connection_get_channel_max shall return in the channel_max argument the current channel_max setting.] */
*channel_max = connection->channel_max;
/* Codes_S_R_S_CONNECTION_01_183: [On success, connection_get_channel_max shall return 0.] */
result = 0;
}
return result;
}
int connection_set_idle_timeout(CONNECTION_HANDLE connection, milliseconds idle_timeout)
{
int result;
/* Codes_S_R_S_CONNECTION_01_191: [If connection is NULL, connection_set_idle_timeout shall fail and return a non-zero value.] */
if (connection == NULL)
{
LogError("NULL connection");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_158: [If connection_set_idle_timeout is called after the initial Open frame has been sent, it shall fail and return a non-zero value.] */
if (connection->connection_state != CONNECTION_STATE_START)
{
LogError("Connection already open");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_159: [connection_set_idle_timeout shall set the idle_timeout associated with a connection.] */
/* Codes_S_R_S_CONNECTION_01_166: [If connection_set_idle_timeout fails, the previous idle_timeout setting shall be retained.] */
connection->idle_timeout = idle_timeout;
connection->idle_timeout_specified = true;
/* Codes_S_R_S_CONNECTION_01_160: [On success connection_set_idle_timeout shall return 0.] */
result = 0;
}
}
return result;
}
int connection_get_idle_timeout(CONNECTION_HANDLE connection, milliseconds* idle_timeout)
{
int result;
/* Codes_S_R_S_CONNECTION_01_190: [If connection or idle_timeout is NULL, connection_get_idle_timeout shall fail and return a non-zero value.] */
if ((connection == NULL) ||
(idle_timeout == NULL))
{
LogError("Bad arguments: connection = %p, idle_timeout = %p",
connection, idle_timeout);
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_188: [connection_get_idle_timeout shall return in the idle_timeout argument the current idle_timeout setting.] */
*idle_timeout = connection->idle_timeout;
/* Codes_S_R_S_CONNECTION_01_189: [On success, connection_get_idle_timeout shall return 0.] */
result = 0;
}
return result;
}
int connection_set_properties(CONNECTION_HANDLE connection, fields properties)
{
int result;
/* Codes_S_R_S_CONNECTION_01_261: [If connection is NULL, connection_set_properties shall fail and return a non-zero value.] */
if (connection == NULL)
{
LogError("NULL connection");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_262: [If connection_set_properties is called after the initial Open frame has been sent, it shall fail and return a non-zero value.] */
if (connection->connection_state != CONNECTION_STATE_START)
{
LogError("Connection already open");
result = __FAILURE__;
}
else
{
if (properties == NULL)
{
/* Codes_S_R_S_CONNECTION_01_263: [ If `properties` is NULL, the previously stored properties associated with `connection` shall be freed. ]*/
if (connection->properties != NULL)
{
fields_destroy(connection->properties);
connection->properties = NULL;
}
/* Codes_S_R_S_CONNECTION_01_264: [ On success it shall return 0. ]*/
result = 0;
}
else
{
fields new_properties;
/* Codes_S_R_S_CONNECTION_01_265: [ `connection_set_properties` shall copy the contents of `properties` as the properties contents for the connection instance identified by `connection`. ]*/
/* Codes_S_R_S_CONNECTION_01_266: [ Cloning the properties shall be done by calling `fields_clone`. ]*/
new_properties = fields_clone(properties);
if (new_properties == NULL)
{
/* Codes_S_R_S_CONNECTION_01_267: [ If `fields_clone` fails, `connection_set_properties` shall fail and return a non-zero value. ]*/
LogError("Cannot clone connection properties");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_268: [ If setting the properties fails, the previous value shall be preserved. ]*/
/* Only do the free of the previous value if we could clone the new one*/
if (connection->properties != NULL)
{
fields_destroy(connection->properties);
}
connection->properties = new_properties;
/* Codes_S_R_S_CONNECTION_01_264: [ On success it shall return 0. ]*/
result = 0;
}
}
}
}
return result;
}
int connection_get_properties(CONNECTION_HANDLE connection, fields* properties)
{
int result;
/* Codes_S_R_S_CONNECTION_01_269: [If connection or properties is NULL, connection_get_properties shall fail and return a non-zero value.] */
if ((connection == NULL) ||
(properties == NULL))
{
LogError("Bad arguments: connection = %p, properties = %p",
connection, properties);
result = __FAILURE__;
}
else
{
if (connection->properties == NULL)
{
/* Codes_S_R_S_CONNECTION_01_270: [ If no properties have been set, `connection_get_properties` shall set `properties` to NULL. ]*/
*properties = NULL;
/* Codes_S_R_S_CONNECTION_01_271: [On success, connection_get_properties shall return 0.] */
result = 0;
}
else
{
/* Codes_S_R_S_CONNECTION_01_272: [connection_get_properties shall return in the properties argument the current properties setting.] */
/* Codes_S_R_S_CONNECTION_01_273: [ Cloning the properties shall be done by calling `fields_clone`. ]*/
*properties = fields_clone(connection->properties);
if (*properties == NULL)
{
/* Codes_S_R_S_CONNECTION_01_274: [ If `fields_clone` fails, `connection_get_properties` shall fail and return a non-zero value. ]*/
LogError("Cannot clone properties");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_271: [On success, connection_get_properties shall return 0.] */
result = 0;
}
}
}
return result;
}
int connection_get_remote_max_frame_size(CONNECTION_HANDLE connection, uint32_t* remote_max_frame_size)
{
int result;
if ((connection == NULL) ||
(remote_max_frame_size == NULL))
{
LogError("Bad arguments: connection = %p, remote_max_frame_size = %p",
connection, remote_max_frame_size);
result = __FAILURE__;
}
else
{
*remote_max_frame_size = connection->remote_max_frame_size;
result = 0;
}
return result;
}
uint64_t connection_handle_deadlines(CONNECTION_HANDLE connection)
{
uint64_t local_deadline = (uint64_t)-1;
uint64_t remote_deadline = (uint64_t)-1;
if (connection == NULL)
{
LogError("NULL connection");
}
else
{
tickcounter_ms_t current_ms;
if (tickcounter_get_current_ms(connection->tick_counter, ¤t_ms) != 0)
{
LogError("Could not get tick counter value");
close_connection_with_error(connection, "amqp:internal-error", "Could not get tick count", NULL);
}
else
{
if (connection->idle_timeout_specified && (connection->idle_timeout != 0))
{
/* Calculate time until configured idle timeout expires */
uint64_t time_since_last_received = current_ms - connection->last_frame_received_time;
if (time_since_last_received < connection->idle_timeout)
{
local_deadline = connection->idle_timeout - time_since_last_received;
}
else
{
local_deadline = 0;
/* close connection */
close_connection_with_error(connection, "amqp:internal-error", "No frame received for the idle timeout", NULL);
}
}
if (local_deadline != 0 && connection->remote_idle_timeout != 0)
{
/* Calculate time until remote idle timeout expires */
uint64_t remote_idle_timeout = connection->remote_idle_timeout_send_frame_millisecond;
uint64_t time_since_last_sent = current_ms - connection->last_frame_sent_time;
if (time_since_last_sent < remote_idle_timeout)
{
remote_deadline = remote_idle_timeout - time_since_last_sent;
}
else
{
connection->on_send_complete = NULL;
if (amqp_frame_codec_encode_empty_frame(connection->amqp_frame_codec, 0, on_bytes_encoded, connection) != 0)
{
LogError("Encoding the empty frame failed");
/* close connection */
close_connection_with_error(connection, "amqp:internal-error", "Cannot send empty frame", NULL);
}
else
{
if (connection->is_trace_on == 1)
{
LOG(AZ_LOG_TRACE, LOG_LINE, "-> Empty frame");
}
connection->last_frame_sent_time = current_ms;
remote_deadline = remote_idle_timeout;
}
}
}
}
}
/* Return the shorter of each deadline, or 0 to indicate connection closed */
return local_deadline > remote_deadline ? remote_deadline : local_deadline;
}
void connection_dowork(CONNECTION_HANDLE connection)
{
/* Codes_S_R_S_CONNECTION_01_078: [If handle is NULL, connection_dowork shall do nothing.] */
if (connection == NULL)
{
LogError("NULL connection");
}
else
{
if (connection_handle_deadlines(connection) > 0)
{
/* Codes_S_R_S_CONNECTION_01_076: [connection_dowork shall schedule the underlying IO interface to do its work by calling xio_dowork.] */
xio_dowork(connection->io);
}
}
}
ENDPOINT_HANDLE connection_create_endpoint(CONNECTION_HANDLE connection)
{
ENDPOINT_HANDLE result;
/* Codes_S_R_S_CONNECTION_01_113: [If connection, on_endpoint_frame_received or on_connection_state_changed is NULL, connection_create_endpoint shall fail and return NULL.] */
/* Codes_S_R_S_CONNECTION_01_193: [The context argument shall be allowed to be NULL.] */
if (connection == NULL)
{
LogError("NULL connection");
result = NULL;
}
else
{
/* Codes_S_R_S_CONNECTION_01_115: [If no more endpoints can be created due to all channels being used, connection_create_endpoint shall fail and return NULL.] */
if (connection->endpoint_count >= connection->channel_max)
{
result = NULL;
}
else
{
uint32_t i = 0;
/* Codes_S_R_S_CONNECTION_01_128: [The lowest number outgoing channel shall be associated with the newly created endpoint.] */
for (i = 0; i < connection->endpoint_count; i++)
{
if (connection->endpoints[i]->outgoing_channel > i)
{
/* found a gap in the sorted endpoint array */
break;
}
}
/* Codes_S_R_S_CONNECTION_01_127: [On success, connection_create_endpoint shall return a non-NULL handle to the newly created endpoint.] */
result = (ENDPOINT_HANDLE)malloc(sizeof(ENDPOINT_INSTANCE));
/* Codes_S_R_S_CONNECTION_01_196: [If memory cannot be allocated for the new endpoint, connection_create_endpoint shall fail and return NULL.] */
if (result == NULL)
{
LogError("Cannot allocate memory for endpoint");
}
else
{
ENDPOINT_HANDLE* new_endpoints;
result->on_endpoint_frame_received = NULL;
result->on_connection_state_changed = NULL;
result->callback_context = NULL;
result->outgoing_channel = (uint16_t)i;
result->connection = connection;
/* Codes_S_R_S_CONNECTION_01_197: [The newly created endpoint shall be added to the endpoints list, so that it can be tracked.] */
new_endpoints = (ENDPOINT_HANDLE*)realloc(connection->endpoints, sizeof(ENDPOINT_HANDLE) * (connection->endpoint_count + 1));
if (new_endpoints == NULL)
{
/* Tests_S_R_S_CONNECTION_01_198: [If adding the endpoint to the endpoints list tracked by the connection fails, connection_create_endpoint shall fail and return NULL.] */
LogError("Cannot reallocate memory for connection endpoints");
free(result);
result = NULL;
}
else
{
connection->endpoints = new_endpoints;
if (i < connection->endpoint_count)
{
(void)memmove(&connection->endpoints[i + 1], &connection->endpoints[i], sizeof(ENDPOINT_INSTANCE*) * (connection->endpoint_count - i));
}
connection->endpoints[i] = result;
connection->endpoint_count++;
/* Codes_S_R_S_CONNECTION_01_112: [connection_create_endpoint shall create a new endpoint that can be used by a session.] */
}
}
}
}
return result;
}
int connection_start_endpoint(ENDPOINT_HANDLE endpoint, ON_ENDPOINT_FRAME_RECEIVED on_endpoint_frame_received, ON_CONNECTION_STATE_CHANGED on_connection_state_changed, void* context)
{
int result;
if ((endpoint == NULL) ||
(on_endpoint_frame_received == NULL) ||
(on_connection_state_changed == NULL))
{
LogError("Bad arguments: endpoint = %p, on_endpoint_frame_received = %p, on_connection_state_changed = %p",
endpoint, on_endpoint_frame_received, on_connection_state_changed);
result = __FAILURE__;
}
else
{
endpoint->on_endpoint_frame_received = on_endpoint_frame_received;
endpoint->on_connection_state_changed = on_connection_state_changed;
endpoint->callback_context = context;
result = 0;
}
return result;
}
int connection_endpoint_get_incoming_channel(ENDPOINT_HANDLE endpoint, uint16_t* incoming_channel)
{
int result;
if ((endpoint == NULL) ||
(incoming_channel == NULL))
{
LogError("Bad arguments: endpoint = %p, incoming_channel = %p",
endpoint, incoming_channel);
result = __FAILURE__;
}
else
{
*incoming_channel = endpoint->incoming_channel;
result = 0;
}
return result;
}
/* Codes_S_R_S_CONNECTION_01_129: [connection_destroy_endpoint shall free all resources associated with an endpoint created by connection_create_endpoint.] */
void connection_destroy_endpoint(ENDPOINT_HANDLE endpoint)
{
if (endpoint == NULL)
{
LogError("NULL endpoint");
}
else
{
CONNECTION_HANDLE connection = (CONNECTION_HANDLE)endpoint->connection;
size_t i;
for (i = 0; i < connection->endpoint_count; i++)
{
if (connection->endpoints[i] == endpoint)
{
break;
}
}
/* Codes_S_R_S_CONNECTION_01_130: [The outgoing channel associated with the endpoint shall be released by removing the endpoint from the endpoint list.] */
/* Codes_S_R_S_CONNECTION_01_131: [Any incoming channel number associated with the endpoint shall be released.] */
if (i < connection->endpoint_count)
{
// endpoint found
if (connection->endpoint_count == 1)
{
free(connection->endpoints);
connection->endpoints = NULL;
connection->endpoint_count = 0;
}
else
{
ENDPOINT_HANDLE* new_endpoints;
if ((connection->endpoint_count - i - 1) > 0)
{
(void)memmove(connection->endpoints + i, connection->endpoints + i + 1, sizeof(ENDPOINT_HANDLE) * (connection->endpoint_count - i - 1));
}
new_endpoints = (ENDPOINT_HANDLE*)realloc(connection->endpoints, (connection->endpoint_count - 1) * sizeof(ENDPOINT_HANDLE));
if (new_endpoints != NULL)
{
connection->endpoints = new_endpoints;
}
connection->endpoint_count--;
}
}
free(endpoint);
}
}
/* Codes_S_R_S_CONNECTION_01_247: [connection_encode_frame shall send a frame for a certain endpoint.] */
int connection_encode_frame(ENDPOINT_HANDLE endpoint, AMQP_VALUE performative, PAYLOAD* payloads, size_t payload_count, ON_SEND_COMPLETE on_send_complete, void* callback_context)
{
int result;
/* Codes_S_R_S_CONNECTION_01_249: [If endpoint or performative are NULL, connection_encode_frame shall fail and return a non-zero value.] */
if ((endpoint == NULL) ||
(performative == NULL))
{
LogError("Bad arguments: endpoint = %p, performative = %p",
endpoint, performative);
result = __FAILURE__;
}
else
{
CONNECTION_HANDLE connection = (CONNECTION_HANDLE)endpoint->connection;
AMQP_FRAME_CODEC_HANDLE amqp_frame_codec = connection->amqp_frame_codec;
/* Codes_S_R_S_CONNECTION_01_254: [If connection_encode_frame is called before the connection is in the OPENED state, connection_encode_frame shall fail and return a non-zero value.] */
if (connection->connection_state != CONNECTION_STATE_OPENED)
{
LogError("Connection not open");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_255: [The payload size shall be computed based on all the payload chunks passed as argument in payloads.] */
/* Codes_S_R_S_CONNECTION_01_250: [connection_encode_frame shall initiate the frame send by calling amqp_frame_codec_begin_encode_frame.] */
/* Codes_S_R_S_CONNECTION_01_251: [The channel number passed to amqp_frame_codec_begin_encode_frame shall be the outgoing channel number associated with the endpoint by connection_create_endpoint.] */
/* Codes_S_R_S_CONNECTION_01_252: [The performative passed to amqp_frame_codec_begin_encode_frame shall be the performative argument of connection_encode_frame.] */
connection->on_send_complete = on_send_complete;
connection->on_send_complete_callback_context = callback_context;
if (amqp_frame_codec_encode_frame(amqp_frame_codec, endpoint->outgoing_channel, performative, payloads, payload_count, on_bytes_encoded, connection) != 0)
{
/* Codes_S_R_S_CONNECTION_01_253: [If amqp_frame_codec_begin_encode_frame or amqp_frame_codec_encode_payload_bytes fails, then connection_encode_frame shall fail and return a non-zero value.] */
LogError("Encoding AMQP frame failed");
result = __FAILURE__;
}
else
{
if (connection->is_trace_on == 1)
{
log_outgoing_frame(performative);
}
if (tickcounter_get_current_ms(connection->tick_counter, &connection->last_frame_sent_time) != 0)
{
LogError("Getting tick counter value failed");
result = __FAILURE__;
}
else
{
/* Codes_S_R_S_CONNECTION_01_248: [On success it shall return 0.] */
result = 0;
}
}
}
}
return result;
}
void connection_set_trace(CONNECTION_HANDLE connection, bool trace_on)
{
/* Codes_S_R_S_CONNECTION_07_002: [If connection is NULL then connection_set_trace shall do nothing.] */
if (connection == NULL)
{
LogError("NULL connection");
}
else
{
/* Codes_S_R_S_CONNECTION_07_001: [connection_set_trace shall set the ability to turn on and off trace logging.] */
connection->is_trace_on = trace_on ? 1 : 0;
}
}
int connection_set_remote_idle_timeout_empty_frame_send_ratio(CONNECTION_HANDLE connection, double idle_timeout_empty_frame_send_ratio)
{
int result;
if ((connection == NULL) ||
(idle_timeout_empty_frame_send_ratio <= 0.0) ||
(idle_timeout_empty_frame_send_ratio > 1.0))
{
LogError("Bad arguments: connection = %p, idle_timeout_empty_frame_send_ratio = %f",
connection, idle_timeout_empty_frame_send_ratio);
result = __FAILURE__;
}
else
{
connection->idle_timeout_empty_frame_send_ratio = idle_timeout_empty_frame_send_ratio;
result = 0;
}
return result;
}
ON_CONNECTION_CLOSED_EVENT_SUBSCRIPTION_HANDLE connection_subscribe_on_connection_close_received(CONNECTION_HANDLE connection, ON_CONNECTION_CLOSE_RECEIVED on_connection_close_received, void* context)
{
ON_CONNECTION_CLOSED_EVENT_SUBSCRIPTION_HANDLE result;
/* Codes_S_R_S_CONNECTION_01_279: [ `context` shall be allowed to be NULL. ]*/
/* Codes_S_R_S_CONNECTION_01_277: [ If `connection` is NULL, `connection_subscribe_on_connection_close_received` shall fail and return NULL. ]*/
if ((connection == NULL) ||
/* Codes_S_R_S_CONNECTION_01_278: [ If `on_connection_close_received` is NULL, `connection_subscribe_on_connection_close_received` shall fail and return NULL. ]*/
(on_connection_close_received == NULL))
{
LogError("Invalid arguments: connection = %p, on_connection_close_received = %p, context = %p",
connection, on_connection_close_received, context);
result = NULL;
}
else
{
if (connection->on_connection_close_received_event_subscription.on_connection_close_received != NULL)
{
/* Codes_S_R_S_CONNECTION_01_280: [ Only one subscription shall be allowed per connection, if a subsequent second even subscription is done while a subscription is active, `connection_subscribe_on_connection_close_received` shall fail and return NULL. ]*/
LogError("Already subscribed for on_connection_close_received events");
result = NULL;
}
else
{
/* Codes_S_R_S_CONNECTION_01_275: [ `connection_subscribe_on_connection_close_received` shall register the `on_connection_close_received` handler to be triggered whenever a CLOSE performative is received.. ]*/
connection->on_connection_close_received_event_subscription.on_connection_close_received = on_connection_close_received;
connection->on_connection_close_received_event_subscription.context = context;
/* Codes_S_R_S_CONNECTION_01_276: [ On success, `connection_subscribe_on_connection_close_received` shall return a non-NULL handle to the event subcription. ]*/
result = &connection->on_connection_close_received_event_subscription;
}
}
return result;
}
void connection_unsubscribe_on_connection_close_received(ON_CONNECTION_CLOSED_EVENT_SUBSCRIPTION_HANDLE event_subscription)
{
if (event_subscription == NULL)
{
LogError("NULL event_subscription");
}
else
{
/* Codes_S_R_S_CONNECTION_01_281: [ `connection_unsubscribe_on_connection_close_received` shall remove the subscription for the connection closed event that was made by calling `connection_subscribe_on_connection_close_received`. ]*/
event_subscription->on_connection_close_received = NULL;
event_subscription->context = NULL;
}
}
