Xin Zhang
/
azure-iot-c-sdk-f767zi
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Diff: uamqp/src/session.c
- Revision:
- 0:f7f1f0d76dd6
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/uamqp/src/session.c Thu Aug 23 06:52:14 2018 +0000
@@ -0,0 +1,1645 @@
+// 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_uamqp_c/session.h"
+#include "azure_uamqp_c/connection.h"
+#include "azure_uamqp_c/amqp_definitions.h"
+
+typedef enum LINK_ENDPOINT_STATE_TAG
+{
+ LINK_ENDPOINT_STATE_NOT_ATTACHED,
+ LINK_ENDPOINT_STATE_ATTACHED,
+ LINK_ENDPOINT_STATE_DETACHING
+} LINK_ENDPOINT_STATE;
+
+typedef struct LINK_ENDPOINT_INSTANCE_TAG
+{
+ char* name;
+ handle input_handle;
+ handle output_handle;
+ ON_ENDPOINT_FRAME_RECEIVED frame_received_callback;
+ ON_SESSION_STATE_CHANGED on_session_state_changed;
+ ON_SESSION_FLOW_ON on_session_flow_on;
+ void* callback_context;
+ SESSION_HANDLE session;
+ LINK_ENDPOINT_STATE link_endpoint_state;
+} LINK_ENDPOINT_INSTANCE;
+
+typedef struct SESSION_INSTANCE_TAG
+{
+ ON_ENDPOINT_FRAME_RECEIVED frame_received_callback;
+ void* frame_received_callback_context;
+ SESSION_STATE session_state;
+ SESSION_STATE previous_session_state;
+ CONNECTION_HANDLE connection;
+ ENDPOINT_HANDLE endpoint;
+ LINK_ENDPOINT_INSTANCE** link_endpoints;
+ uint32_t link_endpoint_count;
+
+ ON_LINK_ATTACHED on_link_attached;
+ void* on_link_attached_callback_context;
+
+ /* Codes_S_R_S_SESSION_01_016: [next-outgoing-id The next-outgoing-id is the transfer-id to assign to the next transfer frame.] */
+ transfer_number next_outgoing_id;
+ transfer_number next_incoming_id;
+ uint32_t desired_incoming_window;
+ uint32_t incoming_window;
+ uint32_t outgoing_window;
+ handle handle_max;
+ uint32_t remote_incoming_window;
+ uint32_t remote_outgoing_window;
+ unsigned int is_underlying_connection_open : 1;
+} SESSION_INSTANCE;
+
+#define UNDERLYING_CONNECTION_NOT_OPEN 0
+#define UNDERLYING_CONNECTION_OPEN 1
+
+static void remove_link_endpoint(LINK_ENDPOINT_HANDLE link_endpoint)
+{
+ if (link_endpoint != NULL)
+ {
+ LINK_ENDPOINT_INSTANCE* endpoint_instance = (LINK_ENDPOINT_INSTANCE*)link_endpoint;
+ SESSION_INSTANCE* session_instance = endpoint_instance->session;
+ uint32_t i;
+
+ for (i = 0; i < session_instance->link_endpoint_count; i++)
+ {
+ if (session_instance->link_endpoints[i] == link_endpoint)
+ {
+ break;
+ }
+ }
+
+ if (i < session_instance->link_endpoint_count)
+ {
+ LINK_ENDPOINT_INSTANCE** new_endpoints;
+
+ if (i < (session_instance->link_endpoint_count - 1))
+ {
+ (void)memmove(&session_instance->link_endpoints[i], &session_instance->link_endpoints[i + 1], (session_instance->link_endpoint_count - (uint32_t)i - 1) * sizeof(LINK_ENDPOINT_INSTANCE*));
+ }
+
+ session_instance->link_endpoint_count--;
+
+ if (session_instance->link_endpoint_count == 0)
+ {
+ free(session_instance->link_endpoints);
+ session_instance->link_endpoints = NULL;
+ }
+ else
+ {
+ new_endpoints = (LINK_ENDPOINT_INSTANCE**)realloc(session_instance->link_endpoints, sizeof(LINK_ENDPOINT_INSTANCE*) * session_instance->link_endpoint_count);
+ if (new_endpoints != NULL)
+ {
+ session_instance->link_endpoints = new_endpoints;
+ }
+ }
+ }
+ }
+}
+
+static void free_link_endpoint(LINK_ENDPOINT_HANDLE link_endpoint)
+{
+ if (link_endpoint->name != NULL)
+ {
+ free(link_endpoint->name);
+ }
+
+ free(link_endpoint);
+}
+
+static void session_set_state(SESSION_INSTANCE* session_instance, SESSION_STATE session_state)
+{
+ uint32_t i;
+
+ session_instance->previous_session_state = session_instance->session_state;
+ session_instance->session_state = session_state;
+
+ for (i = 0; i < session_instance->link_endpoint_count; i++)
+ {
+ if (session_instance->link_endpoints[i]->on_session_state_changed != NULL)
+ {
+ if (session_instance->link_endpoints[i]->link_endpoint_state != LINK_ENDPOINT_STATE_DETACHING)
+ {
+ session_instance->link_endpoints[i]->on_session_state_changed(session_instance->link_endpoints[i]->callback_context, session_state, session_instance->previous_session_state);
+ }
+ }
+ }
+}
+
+static int send_end_frame(SESSION_INSTANCE* session_instance, ERROR_HANDLE error_handle)
+{
+ int result;
+ END_HANDLE end_performative;
+
+ end_performative = end_create();
+ if (end_performative == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ if ((error_handle != NULL) &&
+ (end_set_error(end_performative, error_handle) != 0))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ AMQP_VALUE end_performative_value = amqpvalue_create_end(end_performative);
+ if (end_performative_value == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ if (connection_encode_frame(session_instance->endpoint, end_performative_value, NULL, 0, NULL, NULL) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ result = 0;
+ }
+
+ amqpvalue_destroy(end_performative_value);
+ }
+ }
+
+ end_destroy(end_performative);
+ }
+
+ return result;
+}
+
+static void end_session_with_error(SESSION_INSTANCE* session_instance, const char* condition_value, const char* description)
+{
+ ERROR_HANDLE error_handle = error_create(condition_value);
+ if (error_handle == NULL)
+ {
+ /* fatal error */
+ session_set_state(session_instance, SESSION_STATE_DISCARDING);
+ (void)connection_close(session_instance->connection, "amqp:internal-error", "Cannot allocate error handle to end session", NULL);
+ }
+ else
+ {
+ if ((error_set_description(error_handle, description) != 0) ||
+ (send_end_frame(session_instance, error_handle) != 0))
+ {
+ /* fatal error */
+ session_set_state(session_instance, SESSION_STATE_DISCARDING);
+ (void)connection_close(session_instance->connection, "amqp:internal-error", "Cannot allocate error handle to end session", NULL);
+ }
+ else
+ {
+ session_set_state(session_instance, SESSION_STATE_DISCARDING);
+ }
+
+ error_destroy(error_handle);
+ }
+}
+
+static int send_begin(SESSION_INSTANCE* session_instance)
+{
+ int result;
+ BEGIN_HANDLE begin = begin_create(session_instance->next_outgoing_id, session_instance->incoming_window, session_instance->outgoing_window);
+
+ if (begin == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ uint16_t remote_channel;
+ if (begin_set_handle_max(begin, session_instance->handle_max) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else if ((session_instance->session_state == SESSION_STATE_BEGIN_RCVD) &&
+ ((connection_endpoint_get_incoming_channel(session_instance->endpoint, &remote_channel) != 0) ||
+ (begin_set_remote_channel(begin, remote_channel) != 0)))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ AMQP_VALUE begin_performative_value = amqpvalue_create_begin(begin);
+ if (begin_performative_value == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ if (connection_encode_frame(session_instance->endpoint, begin_performative_value, NULL, 0, NULL, NULL) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ result = 0;
+ }
+
+ amqpvalue_destroy(begin_performative_value);
+ }
+ }
+
+ begin_destroy(begin);
+ }
+
+ return result;
+}
+
+static int send_flow(SESSION_INSTANCE* session)
+{
+ int result;
+ if (session == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ FLOW_HANDLE flow = flow_create(session->incoming_window, session->next_outgoing_id, session->outgoing_window);
+
+ if (flow == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ if (flow_set_next_incoming_id(flow, session->next_incoming_id) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ AMQP_VALUE flow_performative_value = amqpvalue_create_flow(flow);
+ if (flow_performative_value == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ if (connection_encode_frame(session->endpoint, flow_performative_value, NULL, 0, NULL, NULL) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ result = 0;
+ }
+
+ amqpvalue_destroy(flow_performative_value);
+ }
+ }
+
+ flow_destroy(flow);
+ }
+ }
+
+ return result;
+}
+
+static LINK_ENDPOINT_INSTANCE* find_link_endpoint_by_name(SESSION_INSTANCE* session, const char* name)
+{
+ uint32_t i;
+ LINK_ENDPOINT_INSTANCE* result;
+
+ for (i = 0; i < session->link_endpoint_count; i++)
+ {
+ if (strcmp(session->link_endpoints[i]->name, name) == 0)
+ {
+ break;
+ }
+ }
+
+ if (i == session->link_endpoint_count)
+ {
+ result = NULL;
+ }
+ else
+ {
+ result = session->link_endpoints[i];
+ }
+
+ return result;
+}
+
+static LINK_ENDPOINT_INSTANCE* find_link_endpoint_by_input_handle(SESSION_INSTANCE* session, handle input_handle)
+{
+ uint32_t i;
+ LINK_ENDPOINT_INSTANCE* result;
+
+ for (i = 0; i < session->link_endpoint_count; i++)
+ {
+ if (session->link_endpoints[i]->input_handle == input_handle)
+ {
+ break;
+ }
+ }
+
+ if (i == session->link_endpoint_count)
+ {
+ result = NULL;
+ }
+ else
+ {
+ result = session->link_endpoints[i];
+ }
+
+ return result;
+}
+
+static void on_connection_state_changed(void* context, CONNECTION_STATE new_connection_state, CONNECTION_STATE previous_connection_state)
+{
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)context;
+
+ /* Codes_S_R_S_SESSION_01_060: [If the previous connection state is not OPENED and the new connection state is OPENED, the BEGIN frame shall be sent out and the state shall be switched to BEGIN_SENT.] */
+ if ((new_connection_state == CONNECTION_STATE_OPENED) && (previous_connection_state != CONNECTION_STATE_OPENED) && (session_instance->session_state == SESSION_STATE_UNMAPPED))
+ {
+ if (send_begin(session_instance) == 0)
+ {
+ session_set_state(session_instance, SESSION_STATE_BEGIN_SENT);
+ }
+ }
+ /* Codes_S_R_S_SESSION_01_061: [If the previous connection state is OPENED and the new connection state is not OPENED anymore, the state shall be switched to DISCARDING.] */
+ else if ((new_connection_state == CONNECTION_STATE_CLOSE_RCVD) || (new_connection_state == CONNECTION_STATE_END))
+ {
+ session_set_state(session_instance, SESSION_STATE_DISCARDING);
+ }
+ /* Codes_S_R_S_SESSION_09_001: [If the new connection state is ERROR, the state shall be switched to ERROR.] */
+ else if (new_connection_state == CONNECTION_STATE_ERROR)
+ {
+ session_set_state(session_instance, SESSION_STATE_ERROR);
+ }
+}
+
+static void on_frame_received(void* context, AMQP_VALUE performative, uint32_t payload_size, const unsigned char* payload_bytes)
+{
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)context;
+ AMQP_VALUE descriptor = amqpvalue_get_inplace_descriptor(performative);
+
+ if (is_begin_type_by_descriptor(descriptor))
+ {
+ BEGIN_HANDLE begin_handle;
+
+ if (amqpvalue_get_begin(performative, &begin_handle) != 0)
+ {
+ connection_close(session_instance->connection, "amqp:decode-error", "Cannot decode BEGIN frame", NULL);
+ }
+ else
+ {
+ if ((begin_get_incoming_window(begin_handle, &session_instance->remote_incoming_window) != 0) ||
+ (begin_get_next_outgoing_id(begin_handle, &session_instance->next_incoming_id) != 0))
+ {
+ /* error */
+ begin_destroy(begin_handle);
+ session_set_state(session_instance, SESSION_STATE_DISCARDING);
+ connection_close(session_instance->connection, "amqp:decode-error", "Cannot get incoming windows and next outgoing id", NULL);
+ }
+ else
+ {
+ begin_destroy(begin_handle);
+
+ if (session_instance->session_state == SESSION_STATE_BEGIN_SENT)
+ {
+ session_set_state(session_instance, SESSION_STATE_MAPPED);
+ }
+ else if(session_instance->session_state == SESSION_STATE_UNMAPPED)
+ {
+ session_set_state(session_instance, SESSION_STATE_BEGIN_RCVD);
+ if (send_begin(session_instance) != 0)
+ {
+ connection_close(session_instance->connection, "amqp:internal-error", "Failed sending BEGIN frame", NULL);
+ session_set_state(session_instance, SESSION_STATE_DISCARDING);
+ }
+ else
+ {
+ session_set_state(session_instance, SESSION_STATE_MAPPED);
+ }
+ }
+ }
+ }
+ }
+ else if (is_attach_type_by_descriptor(descriptor))
+ {
+ const char* name = NULL;
+ ATTACH_HANDLE attach_handle;
+
+ if (amqpvalue_get_attach(performative, &attach_handle) != 0)
+ {
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot decode ATTACH frame");
+ }
+ else
+ {
+ role role;
+ AMQP_VALUE source;
+ AMQP_VALUE target;
+
+ if (attach_get_name(attach_handle, &name) != 0)
+ {
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot get link name from ATTACH frame");
+ }
+ else if (attach_get_role(attach_handle, &role) != 0)
+ {
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot get link role from ATTACH frame");
+ }
+ else
+ {
+ LINK_ENDPOINT_INSTANCE* link_endpoint;
+
+ if (attach_get_source(attach_handle, &source) != 0)
+ {
+ source = NULL;
+ }
+ if (attach_get_target(attach_handle, &target) != 0)
+ {
+ target = NULL;
+ }
+
+ link_endpoint = find_link_endpoint_by_name(session_instance, name);
+ if (link_endpoint == NULL)
+ {
+ /* new link attach */
+ if (session_instance->on_link_attached != NULL)
+ {
+ LINK_ENDPOINT_HANDLE new_link_endpoint = session_create_link_endpoint(session_instance, name);
+ if (new_link_endpoint == NULL)
+ {
+ end_session_with_error(session_instance, "amqp:internal-error", "Cannot create link endpoint");
+ }
+ else if (attach_get_handle(attach_handle, &new_link_endpoint->input_handle) != 0)
+ {
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot get input handle from ATTACH frame");
+ }
+ else
+ {
+ new_link_endpoint->link_endpoint_state = LINK_ENDPOINT_STATE_ATTACHED;
+
+ if (!session_instance->on_link_attached(session_instance->on_link_attached_callback_context, new_link_endpoint, name, role, source, target))
+ {
+ remove_link_endpoint(new_link_endpoint);
+ free_link_endpoint(new_link_endpoint);
+ new_link_endpoint = NULL;
+ }
+ else
+ {
+ if (new_link_endpoint->frame_received_callback != NULL)
+ {
+ new_link_endpoint->frame_received_callback(new_link_endpoint->callback_context, performative, payload_size, payload_bytes);
+ }
+ }
+ }
+ }
+ }
+ else
+ {
+ if (attach_get_handle(attach_handle, &link_endpoint->input_handle) != 0)
+ {
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot get input handle from ATTACH frame");
+ }
+ else
+ {
+ link_endpoint->link_endpoint_state = LINK_ENDPOINT_STATE_ATTACHED;
+
+ link_endpoint->frame_received_callback(link_endpoint->callback_context, performative, payload_size, payload_bytes);
+ }
+ }
+ }
+
+ attach_destroy(attach_handle);
+ }
+ }
+ else if (is_detach_type_by_descriptor(descriptor))
+ {
+ DETACH_HANDLE detach_handle;
+
+ if (amqpvalue_get_detach(performative, &detach_handle) != 0)
+ {
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot decode DETACH frame");
+ }
+ else
+ {
+ uint32_t remote_handle;
+ if (detach_get_handle(detach_handle, &remote_handle) != 0)
+ {
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot get handle from DETACH frame");
+
+ detach_destroy(detach_handle);
+ }
+ else
+ {
+ LINK_ENDPOINT_INSTANCE* link_endpoint;
+ detach_destroy(detach_handle);
+
+ link_endpoint = find_link_endpoint_by_input_handle(session_instance, remote_handle);
+ if (link_endpoint == NULL)
+ {
+ end_session_with_error(session_instance, "amqp:session:unattached-handle", "");
+ }
+ else
+ {
+ if (link_endpoint->link_endpoint_state != LINK_ENDPOINT_STATE_DETACHING)
+ {
+ link_endpoint->link_endpoint_state = LINK_ENDPOINT_STATE_DETACHING;
+ link_endpoint->frame_received_callback(link_endpoint->callback_context, performative, payload_size, payload_bytes);
+ }
+ else
+ {
+ /* remove the link endpoint */
+ remove_link_endpoint(link_endpoint);
+ free_link_endpoint(link_endpoint);
+ }
+ }
+ }
+ }
+ }
+ else if (is_flow_type_by_descriptor(descriptor))
+ {
+ FLOW_HANDLE flow_handle;
+
+ if (amqpvalue_get_flow(performative, &flow_handle) != 0)
+ {
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot decode FLOW frame");
+ }
+ else
+ {
+ uint32_t remote_handle;
+ transfer_number flow_next_incoming_id;
+ uint32_t flow_incoming_window;
+
+ if (flow_get_next_incoming_id(flow_handle, &flow_next_incoming_id) != 0)
+ {
+ /*
+ If the next-incoming-id field of the flow frame is not set,
+ then remote-incomingwindow is computed as follows:
+ initial-outgoing-id(endpoint) + incoming-window(flow) - next-outgoing-id(endpoint)
+ */
+ flow_next_incoming_id = session_instance->next_outgoing_id;
+ }
+
+ if ((flow_get_next_outgoing_id(flow_handle, &session_instance->next_incoming_id) != 0) ||
+ (flow_get_incoming_window(flow_handle, &flow_incoming_window) != 0))
+ {
+ flow_destroy(flow_handle);
+
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot decode FLOW frame");
+ }
+ else
+ {
+ LINK_ENDPOINT_INSTANCE* link_endpoint_instance = NULL;
+ size_t i;
+
+ session_instance->remote_incoming_window = flow_next_incoming_id + flow_incoming_window - session_instance->next_outgoing_id;
+
+ if (flow_get_handle(flow_handle, &remote_handle) == 0)
+ {
+ link_endpoint_instance = find_link_endpoint_by_input_handle(session_instance, remote_handle);
+ }
+
+ flow_destroy(flow_handle);
+
+ if (link_endpoint_instance != NULL)
+ {
+ if (link_endpoint_instance->link_endpoint_state != LINK_ENDPOINT_STATE_DETACHING)
+ {
+ link_endpoint_instance->frame_received_callback(link_endpoint_instance->callback_context, performative, payload_size, payload_bytes);
+ }
+ }
+
+ i = 0;
+ while ((session_instance->remote_incoming_window > 0) && (i < session_instance->link_endpoint_count))
+ {
+ /* notify the caller that it can send here */
+ if (session_instance->link_endpoints[i]->on_session_flow_on != NULL)
+ {
+ session_instance->link_endpoints[i]->on_session_flow_on(session_instance->link_endpoints[i]->callback_context);
+ }
+
+ i++;
+ }
+ }
+ }
+ }
+ else if (is_transfer_type_by_descriptor(descriptor))
+ {
+ TRANSFER_HANDLE transfer_handle;
+
+ if (amqpvalue_get_transfer(performative, &transfer_handle) != 0)
+ {
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot decode TRANSFER frame");
+ }
+ else
+ {
+ uint32_t remote_handle;
+ delivery_number delivery_id;
+
+ transfer_get_delivery_id(transfer_handle, &delivery_id);
+ if (transfer_get_handle(transfer_handle, &remote_handle) != 0)
+ {
+ transfer_destroy(transfer_handle);
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot get handle from TRANSFER frame");
+ }
+ else
+ {
+ LINK_ENDPOINT_INSTANCE* link_endpoint;
+ transfer_destroy(transfer_handle);
+
+ session_instance->next_incoming_id++;
+ session_instance->remote_outgoing_window--;
+ session_instance->incoming_window--;
+
+ link_endpoint = find_link_endpoint_by_input_handle(session_instance, remote_handle);
+ if (link_endpoint == NULL)
+ {
+ end_session_with_error(session_instance, "amqp:session:unattached-handle", "");
+ }
+ else
+ {
+ if (link_endpoint->link_endpoint_state != LINK_ENDPOINT_STATE_DETACHING)
+ {
+ link_endpoint->frame_received_callback(link_endpoint->callback_context, performative, payload_size, payload_bytes);
+ }
+ }
+
+ if (session_instance->incoming_window == 0)
+ {
+ session_instance->incoming_window = session_instance->desired_incoming_window;
+ send_flow(session_instance);
+ }
+ }
+ }
+ }
+ else if (is_disposition_type_by_descriptor(descriptor))
+ {
+ uint32_t i;
+
+ for (i = 0; i < session_instance->link_endpoint_count; i++)
+ {
+ LINK_ENDPOINT_INSTANCE* link_endpoint = session_instance->link_endpoints[i];
+ if (link_endpoint->link_endpoint_state != LINK_ENDPOINT_STATE_DETACHING)
+ {
+ link_endpoint->frame_received_callback(link_endpoint->callback_context, performative, payload_size, payload_bytes);
+ }
+ }
+ }
+ else if (is_end_type_by_descriptor(descriptor))
+ {
+ END_HANDLE end_handle;
+
+ if (amqpvalue_get_end(performative, &end_handle) != 0)
+ {
+ end_session_with_error(session_instance, "amqp:decode-error", "Cannot decode END frame");
+ }
+ else
+ {
+ end_destroy(end_handle);
+ if ((session_instance->session_state != SESSION_STATE_END_RCVD) &&
+ (session_instance->session_state != SESSION_STATE_DISCARDING))
+ {
+ session_set_state(session_instance, SESSION_STATE_END_RCVD);
+ if (send_end_frame(session_instance, NULL) != 0)
+ {
+ /* fatal error */
+ (void)connection_close(session_instance->connection, "amqp:internal-error", "Cannot send END frame.", NULL);
+ }
+
+ session_set_state(session_instance, SESSION_STATE_DISCARDING);
+ }
+ }
+ }
+}
+
+SESSION_HANDLE session_create(CONNECTION_HANDLE connection, ON_LINK_ATTACHED on_link_attached, void* callback_context)
+{
+ SESSION_INSTANCE* result;
+
+ if (connection == NULL)
+ {
+ /* Codes_S_R_S_SESSION_01_031: [If connection is NULL, session_create shall fail and return NULL.] */
+ result = NULL;
+ }
+ else
+ {
+ /* Codes_S_R_S_SESSION_01_030: [session_create shall create a new session instance and return a non-NULL handle to it.] */
+ result = (SESSION_INSTANCE*)malloc(sizeof(SESSION_INSTANCE));
+ /* Codes_S_R_S_SESSION_01_042: [If allocating memory for the session fails, session_create shall fail and return NULL.] */
+ if (result != NULL)
+ {
+ result->connection = connection;
+ result->link_endpoints = NULL;
+ result->link_endpoint_count = 0;
+ result->handle_max = 4294967295u;
+
+ /* Codes_S_R_S_SESSION_01_057: [The delivery ids shall be assigned starting at 0.] */
+ /* Codes_S_R_S_SESSION_01_017: [The nextoutgoing-id MAY be initialized to an arbitrary value ] */
+ result->next_outgoing_id = 0;
+
+ result->desired_incoming_window = 1;
+ result->incoming_window = 1;
+ result->outgoing_window = 1;
+ result->handle_max = 4294967295u;
+ result->remote_incoming_window = 0;
+ result->remote_outgoing_window = 0;
+ result->previous_session_state = SESSION_STATE_UNMAPPED;
+ result->is_underlying_connection_open = UNDERLYING_CONNECTION_NOT_OPEN;
+ result->session_state = SESSION_STATE_UNMAPPED;
+ result->on_link_attached = on_link_attached;
+ result->on_link_attached_callback_context = callback_context;
+
+ /* Codes_S_R_S_SESSION_01_032: [session_create shall create a new session endpoint by calling connection_create_endpoint.] */
+ result->endpoint = connection_create_endpoint(connection);
+ if (result->endpoint == NULL)
+ {
+ /* Codes_S_R_S_SESSION_01_033: [If connection_create_endpoint fails, session_create shall fail and return NULL.] */
+ free(result);
+ result = NULL;
+ }
+ else
+ {
+ session_set_state(result, SESSION_STATE_UNMAPPED);
+ }
+ }
+ }
+
+ return result;
+}
+
+SESSION_HANDLE session_create_from_endpoint(CONNECTION_HANDLE connection, ENDPOINT_HANDLE endpoint, ON_LINK_ATTACHED on_link_attached, void* callback_context)
+{
+ SESSION_INSTANCE* result;
+
+ if (endpoint == NULL)
+ {
+ result = NULL;
+ }
+ else
+ {
+ result = (SESSION_INSTANCE*)malloc(sizeof(SESSION_INSTANCE));
+ if (result != NULL)
+ {
+ result->connection = connection;
+ result->link_endpoints = NULL;
+ result->link_endpoint_count = 0;
+ result->handle_max = 4294967295u;
+
+ result->next_outgoing_id = 0;
+
+ result->desired_incoming_window = 1;
+ result->incoming_window = 1;
+ result->outgoing_window = 1;
+ result->handle_max = 4294967295u;
+ result->remote_incoming_window = 0;
+ result->remote_outgoing_window = 0;
+ result->previous_session_state = SESSION_STATE_UNMAPPED;
+ result->is_underlying_connection_open = UNDERLYING_CONNECTION_NOT_OPEN;
+ result->session_state = SESSION_STATE_UNMAPPED;
+ result->on_link_attached = on_link_attached;
+ result->on_link_attached_callback_context = callback_context;
+
+ result->endpoint = endpoint;
+ session_set_state(result, SESSION_STATE_UNMAPPED);
+ }
+ }
+
+ return result;
+}
+
+void session_destroy(SESSION_HANDLE session)
+{
+ /* Codes_S_R_S_SESSION_01_036: [If session is NULL, session_destroy shall do nothing.] */
+ if (session != NULL)
+ {
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)session;
+
+ session_end(session, NULL, NULL);
+
+ /* Codes_S_R_S_SESSION_01_034: [session_destroy shall free all resources allocated by session_create.] */
+ /* Codes_S_R_S_SESSION_01_035: [The endpoint created in session_create shall be freed by calling connection_destroy_endpoint.] */
+ connection_destroy_endpoint(session_instance->endpoint);
+ if (session_instance->link_endpoints != NULL)
+ {
+ free(session_instance->link_endpoints);
+ }
+
+ free(session);
+ }
+}
+
+int session_begin(SESSION_HANDLE session)
+{
+ int result;
+
+ if (session == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)session;
+
+ if (connection_start_endpoint(session_instance->endpoint, on_frame_received, on_connection_state_changed, session_instance) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ if (!session_instance->is_underlying_connection_open)
+ {
+ if (connection_open(session_instance->connection) != 0)
+ {
+ session_instance->is_underlying_connection_open = UNDERLYING_CONNECTION_NOT_OPEN;
+ result = __FAILURE__;
+ }
+ else
+ {
+ session_instance->is_underlying_connection_open = UNDERLYING_CONNECTION_OPEN;
+ result = 0;
+ }
+ }
+ else
+ {
+ result = 0;
+ }
+ }
+ }
+
+ return result;
+}
+
+int session_end(SESSION_HANDLE session, const char* condition_value, const char* description)
+{
+ int result;
+
+ if (session == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)session;
+ size_t i;
+
+ if ((session_instance->session_state != SESSION_STATE_UNMAPPED) &&
+ (session_instance->session_state != SESSION_STATE_DISCARDING))
+ {
+ ERROR_HANDLE error_handle = NULL;
+ result = 0;
+
+ if (condition_value != NULL)
+ {
+ error_handle = error_create(condition_value);
+ if (error_handle == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ if (error_set_description(error_handle, description) != 0)
+ {
+ result = __FAILURE__;
+ }
+ }
+ }
+
+ if (result == 0)
+ {
+ if (send_end_frame(session_instance, error_handle) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ session_set_state(session_instance, SESSION_STATE_DISCARDING);
+ result = 0;
+ }
+ }
+
+ if (error_handle != NULL)
+ {
+ error_destroy(error_handle);
+ }
+ }
+ else
+ {
+ result = 0;
+ }
+
+ // all link endpoints are destroyed when the session end happens
+ for (i = 0; i < session_instance->link_endpoint_count; i++)
+ {
+ free_link_endpoint(session_instance->link_endpoints[i]);
+ }
+
+ session_instance->link_endpoint_count = 0;
+ }
+
+ return result;
+}
+
+int session_set_incoming_window(SESSION_HANDLE session, uint32_t incoming_window)
+{
+ int result;
+
+ if (session == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)session;
+
+ session_instance->desired_incoming_window = incoming_window;
+ session_instance->incoming_window = incoming_window;
+
+ result = 0;
+ }
+
+ return result;
+}
+
+int session_get_incoming_window(SESSION_HANDLE session, uint32_t* incoming_window)
+{
+ int result;
+
+ if ((session == NULL) ||
+ (incoming_window == NULL))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)session;
+
+ *incoming_window = session_instance->incoming_window;
+
+ result = 0;
+ }
+
+ return result;
+}
+
+int session_set_outgoing_window(SESSION_HANDLE session, uint32_t outgoing_window)
+{
+ int result;
+
+ if (session == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)session;
+
+ session_instance->outgoing_window = outgoing_window;
+
+ result = 0;
+ }
+
+ return result;
+}
+
+int session_get_outgoing_window(SESSION_HANDLE session, uint32_t* outgoing_window)
+{
+ int result;
+
+ if ((session == NULL) ||
+ (outgoing_window == NULL))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)session;
+
+ *outgoing_window = session_instance->outgoing_window;
+
+ result = 0;
+ }
+
+ return result;
+}
+
+int session_set_handle_max(SESSION_HANDLE session, handle handle_max)
+{
+ int result;
+
+ if (session == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)session;
+
+ session_instance->handle_max = handle_max;
+
+ result = 0;
+ }
+
+ return result;
+}
+
+int session_get_handle_max(SESSION_HANDLE session, handle* handle_max)
+{
+ int result;
+
+ if ((session == NULL) ||
+ (handle_max == NULL))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)session;
+
+ *handle_max = session_instance->handle_max;
+
+ result = 0;
+ }
+
+ return result;
+}
+
+LINK_ENDPOINT_HANDLE session_create_link_endpoint(SESSION_HANDLE session, const char* name)
+{
+ LINK_ENDPOINT_INSTANCE* result;
+
+ /* Codes_S_R_S_SESSION_01_044: [If session, name or frame_received_callback is NULL, session_create_link_endpoint shall fail and return NULL.] */
+ if ((session == NULL) ||
+ (name == NULL))
+ {
+ result = NULL;
+ }
+ else
+ {
+ /* Codes_S_R_S_SESSION_01_043: [session_create_link_endpoint shall create a link endpoint associated with a given session and return a non-NULL handle to it.] */
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)session;
+
+ result = (LINK_ENDPOINT_INSTANCE*)malloc(sizeof(LINK_ENDPOINT_INSTANCE));
+ /* Codes_S_R_S_SESSION_01_045: [If allocating memory for the link endpoint fails, session_create_link_endpoint shall fail and return NULL.] */
+ if (result != NULL)
+ {
+ /* Codes_S_R_S_SESSION_01_046: [An unused handle shall be assigned to the link endpoint.] */
+ handle selected_handle = 0;
+ size_t i;
+ size_t name_length;
+
+ for (i = 0; i < session_instance->link_endpoint_count; i++)
+ {
+ if (session_instance->link_endpoints[i]->output_handle > selected_handle)
+ {
+ break;
+ }
+
+ selected_handle++;
+ }
+
+ result->on_session_state_changed = NULL;
+ result->on_session_flow_on = NULL;
+ result->frame_received_callback = NULL;
+ result->callback_context = NULL;
+ result->output_handle = selected_handle;
+ result->input_handle = 0xFFFFFFFF;
+ result->link_endpoint_state = LINK_ENDPOINT_STATE_NOT_ATTACHED;
+ name_length = strlen(name);
+ result->name = (char*)malloc(name_length + 1);
+ if (result->name == NULL)
+ {
+ /* Codes_S_R_S_SESSION_01_045: [If allocating memory for the link endpoint fails, session_create_link_endpoint shall fail and return NULL.] */
+ free(result);
+ result = NULL;
+ }
+ else
+ {
+ LINK_ENDPOINT_INSTANCE** new_link_endpoints;
+ (void)memcpy(result->name, name, name_length + 1);
+ result->session = session;
+
+ new_link_endpoints = (LINK_ENDPOINT_INSTANCE**)realloc(session_instance->link_endpoints, sizeof(LINK_ENDPOINT_INSTANCE*) * (session_instance->link_endpoint_count + 1));
+ if (new_link_endpoints == NULL)
+ {
+ /* Codes_S_R_S_SESSION_01_045: [If allocating memory for the link endpoint fails, session_create_link_endpoint shall fail and return NULL.] */
+ free(result->name);
+ free(result);
+ result = NULL;
+ }
+ else
+ {
+ session_instance->link_endpoints = new_link_endpoints;
+
+ if (session_instance->link_endpoint_count - selected_handle > 0)
+ {
+ (void)memmove(&session_instance->link_endpoints[selected_handle + 1], &session_instance->link_endpoints[selected_handle], (session_instance->link_endpoint_count - selected_handle) * sizeof(LINK_ENDPOINT_INSTANCE*));
+ }
+
+ session_instance->link_endpoints[selected_handle] = result;
+ session_instance->link_endpoint_count++;
+ }
+ }
+ }
+ }
+
+ return result;
+}
+
+void session_destroy_link_endpoint(LINK_ENDPOINT_HANDLE link_endpoint)
+{
+ if (link_endpoint != NULL)
+ {
+ LINK_ENDPOINT_INSTANCE* endpoint_instance = (LINK_ENDPOINT_INSTANCE*)link_endpoint;
+
+ if (endpoint_instance->link_endpoint_state == LINK_ENDPOINT_STATE_ATTACHED)
+ {
+ endpoint_instance->link_endpoint_state = LINK_ENDPOINT_STATE_DETACHING;
+ }
+ else
+ {
+ remove_link_endpoint(link_endpoint);
+ free_link_endpoint(link_endpoint);
+ }
+ }
+}
+
+int session_start_link_endpoint(LINK_ENDPOINT_HANDLE link_endpoint, ON_ENDPOINT_FRAME_RECEIVED frame_received_callback, ON_SESSION_STATE_CHANGED on_session_state_changed, ON_SESSION_FLOW_ON on_session_flow_on, void* context)
+{
+ int result;
+
+ if ((link_endpoint == NULL) ||
+ (frame_received_callback == NULL))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ link_endpoint->frame_received_callback = frame_received_callback;
+ link_endpoint->on_session_state_changed = on_session_state_changed;
+ link_endpoint->on_session_flow_on = on_session_flow_on;
+ link_endpoint->callback_context = context;
+ link_endpoint->link_endpoint_state = LINK_ENDPOINT_STATE_NOT_ATTACHED;
+
+ if (link_endpoint->on_session_state_changed != NULL)
+ {
+ link_endpoint->on_session_state_changed(link_endpoint->callback_context, link_endpoint->session->session_state, link_endpoint->session->previous_session_state);
+ }
+
+ result = 0;
+ }
+
+ return result;
+}
+
+static int encode_frame(LINK_ENDPOINT_HANDLE link_endpoint, AMQP_VALUE performative, PAYLOAD* payloads, size_t payload_count)
+{
+ int result;
+
+ if ((link_endpoint == NULL) ||
+ (performative == NULL))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ LINK_ENDPOINT_INSTANCE* link_endpoint_instance = (LINK_ENDPOINT_INSTANCE*)link_endpoint;
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)link_endpoint_instance->session;
+
+ if (connection_encode_frame(session_instance->endpoint, performative, payloads, payload_count, NULL, NULL) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ result = 0;
+ }
+ }
+
+ return result;
+}
+
+int session_send_flow(LINK_ENDPOINT_HANDLE link_endpoint, FLOW_HANDLE flow)
+{
+ int result;
+
+ if ((link_endpoint == NULL) ||
+ (flow == NULL))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ LINK_ENDPOINT_INSTANCE* link_endpoint_instance = (LINK_ENDPOINT_INSTANCE*)link_endpoint;
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)link_endpoint_instance->session;
+
+ result = 0;
+
+ if (session_instance->session_state == SESSION_STATE_BEGIN_RCVD)
+ {
+ if (flow_set_next_incoming_id(flow, session_instance->next_incoming_id) != 0)
+ {
+ result = __FAILURE__;
+ }
+ }
+
+ if (result == 0)
+ {
+ if ((flow_set_next_incoming_id(flow, session_instance->next_incoming_id) != 0) ||
+ (flow_set_incoming_window(flow, session_instance->incoming_window) != 0) ||
+ (flow_set_next_outgoing_id(flow, session_instance->next_outgoing_id) != 0) ||
+ (flow_set_outgoing_window(flow, session_instance->outgoing_window) != 0) ||
+ (flow_set_handle(flow, link_endpoint_instance->output_handle) != 0))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ AMQP_VALUE flow_performative_value = amqpvalue_create_flow(flow);
+ if (flow_performative_value == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ if (encode_frame(link_endpoint, flow_performative_value, NULL, 0) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ result = 0;
+ }
+
+ amqpvalue_destroy(flow_performative_value);
+ }
+ }
+ }
+ }
+
+ return result;
+}
+
+int session_send_attach(LINK_ENDPOINT_HANDLE link_endpoint, ATTACH_HANDLE attach)
+{
+ int result;
+
+ if ((link_endpoint == NULL) ||
+ (attach == NULL))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ LINK_ENDPOINT_INSTANCE* link_endpoint_instance = (LINK_ENDPOINT_INSTANCE*)link_endpoint;
+
+ if (attach_set_handle(attach, link_endpoint_instance->output_handle) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ AMQP_VALUE attach_performative_value = amqpvalue_create_attach(attach);
+ if (attach_performative_value == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ if (encode_frame(link_endpoint, attach_performative_value, NULL, 0) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ result = 0;
+ }
+
+ amqpvalue_destroy(attach_performative_value);
+ }
+ }
+ }
+
+ return result;
+}
+
+int session_send_disposition(LINK_ENDPOINT_HANDLE link_endpoint, DISPOSITION_HANDLE disposition)
+{
+ int result;
+
+ if ((link_endpoint == NULL) ||
+ (disposition == NULL))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ AMQP_VALUE disposition_performative_value = amqpvalue_create_disposition(disposition);
+ if (disposition_performative_value == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ if (encode_frame(link_endpoint, disposition_performative_value, NULL, 0) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ result = 0;
+ }
+
+ amqpvalue_destroy(disposition_performative_value);
+ }
+ }
+
+ return result;
+}
+
+int session_send_detach(LINK_ENDPOINT_HANDLE link_endpoint, DETACH_HANDLE detach)
+{
+ int result;
+
+ if ((link_endpoint == NULL) ||
+ (detach == NULL))
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ LINK_ENDPOINT_INSTANCE* link_endpoint_instance = (LINK_ENDPOINT_INSTANCE*)link_endpoint;
+
+ if (detach_set_handle(detach, link_endpoint_instance->output_handle) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ AMQP_VALUE detach_performative_value = amqpvalue_create_detach(detach);
+ if (detach_performative_value == NULL)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ if (encode_frame(link_endpoint, detach_performative_value, NULL, 0) != 0)
+ {
+ result = __FAILURE__;
+ }
+ else
+ {
+ result = 0;
+ }
+
+ amqpvalue_destroy(detach_performative_value);
+ }
+ }
+ }
+
+ return result;
+}
+
+/* Codes_S_R_S_SESSION_01_051: [session_send_transfer shall send a transfer frame with the performative indicated in the transfer argument.] */
+SESSION_SEND_TRANSFER_RESULT session_send_transfer(LINK_ENDPOINT_HANDLE link_endpoint, TRANSFER_HANDLE transfer, PAYLOAD* payloads, size_t payload_count, delivery_number* delivery_id, ON_SEND_COMPLETE on_send_complete, void* callback_context)
+{
+ SESSION_SEND_TRANSFER_RESULT result;
+
+ /* Codes_S_R_S_SESSION_01_054: [If link_endpoint or transfer is NULL, session_send_transfer shall fail and return a non-zero value.] */
+ if ((link_endpoint == NULL) ||
+ (transfer == NULL))
+ {
+ result = SESSION_SEND_TRANSFER_ERROR;
+ }
+ else
+ {
+ LINK_ENDPOINT_INSTANCE* link_endpoint_instance = (LINK_ENDPOINT_INSTANCE*)link_endpoint;
+ SESSION_INSTANCE* session_instance = (SESSION_INSTANCE*)link_endpoint_instance->session;
+
+ /* Codes_S_R_S_SESSION_01_059: [When session_send_transfer is called while the session is not in the MAPPED state, session_send_transfer shall fail and return a non-zero value.] */
+ if (session_instance->session_state != SESSION_STATE_MAPPED)
+ {
+ result = SESSION_SEND_TRANSFER_ERROR;
+ }
+ else
+ {
+ size_t payload_size = 0;
+ size_t i;
+
+ for (i = 0; i < payload_count; i++)
+ {
+ if ((payloads[i].length > UINT32_MAX) ||
+ (payload_size + payloads[i].length < payload_size))
+ {
+ break;
+ }
+
+ payload_size += payloads[i].length;
+ }
+
+ if ((i < payload_count) ||
+ (payload_size > UINT32_MAX))
+ {
+ result = SESSION_SEND_TRANSFER_ERROR;
+ }
+ else
+ {
+ if (session_instance->remote_incoming_window == 0)
+ {
+ result = SESSION_SEND_TRANSFER_BUSY;
+ }
+ else
+ {
+ /* Codes_S_R_S_SESSION_01_012: [The session endpoint assigns each outgoing transfer frame an implicit transfer-id from a session scoped sequence.] */
+ /* Codes_S_R_S_SESSION_01_027: [sending a transfer Upon sending a transfer, the sending endpoint will increment its next-outgoing-id] */
+ *delivery_id = session_instance->next_outgoing_id;
+ if ((transfer_set_handle(transfer, link_endpoint_instance->output_handle) != 0) ||
+ (transfer_set_delivery_id(transfer, *delivery_id) != 0) ||
+ (transfer_set_more(transfer, false) != 0))
+ {
+ /* Codes_S_R_S_SESSION_01_058: [When any other error occurs, session_send_transfer shall fail and return a non-zero value.] */
+ result = SESSION_SEND_TRANSFER_ERROR;
+ }
+ else
+ {
+ AMQP_VALUE transfer_value;
+
+ transfer_value = amqpvalue_create_transfer(transfer);
+ if (transfer_value == NULL)
+ {
+ /* Codes_S_R_S_SESSION_01_058: [When any other error occurs, session_send_transfer shall fail and return a non-zero value.] */
+ result = SESSION_SEND_TRANSFER_ERROR;
+ }
+ else
+ {
+ uint32_t available_frame_size;
+ size_t encoded_size;
+
+ if ((connection_get_remote_max_frame_size(session_instance->connection, &available_frame_size) != 0) ||
+ (amqpvalue_get_encoded_size(transfer_value, &encoded_size) != 0))
+ {
+ result = SESSION_SEND_TRANSFER_ERROR;
+ }
+ else
+ {
+ payload_size = 0;
+
+ for (i = 0; i < payload_count; i++)
+ {
+ payload_size += payloads[i].length;
+ }
+
+ available_frame_size -= (uint32_t)encoded_size;
+ available_frame_size -= 8;
+
+ if (available_frame_size >= payload_size)
+ {
+ /* Codes_S_R_S_SESSION_01_055: [The encoding of the frame shall be done by calling connection_encode_frame and passing as arguments: the connection handle associated with the session, the transfer performative and the payload chunks passed to session_send_transfer.] */
+ if (connection_encode_frame(session_instance->endpoint, transfer_value, payloads, payload_count, on_send_complete, callback_context) != 0)
+ {
+ /* Codes_S_R_S_SESSION_01_056: [If connection_encode_frame fails then session_send_transfer shall fail and return a non-zero value.] */
+ result = SESSION_SEND_TRANSFER_ERROR;
+ }
+ else
+ {
+ /* Codes_S_R_S_SESSION_01_018: [is incremented after each successive transfer according to RFC-1982 [RFC1982] serial number arithmetic.] */
+ session_instance->next_outgoing_id++;
+ session_instance->remote_incoming_window--;
+ session_instance->outgoing_window--;
+
+ /* Codes_S_R_S_SESSION_01_053: [On success, session_send_transfer shall return 0.] */
+ result = SESSION_SEND_TRANSFER_OK;
+ }
+ }
+ else
+ {
+ size_t current_payload_index = 0;
+ uint32_t current_payload_pos = 0;
+
+ /* break it down into different deliveries */
+ while (payload_size > 0)
+ {
+ uint32_t transfer_frame_payload_count = 0;
+ uint32_t current_transfer_frame_payload_size = (uint32_t)payload_size;
+ uint32_t byte_counter;
+ size_t temp_current_payload_index = current_payload_index;
+ uint32_t temp_current_payload_pos = current_payload_pos;
+ AMQP_VALUE multi_transfer_amqp_value;
+ PAYLOAD* transfer_frame_payloads;
+ bool more;
+
+ if (current_transfer_frame_payload_size > available_frame_size)
+ {
+ current_transfer_frame_payload_size = available_frame_size;
+ }
+
+ if (available_frame_size >= payload_size)
+ {
+ more = false;
+ }
+ else
+ {
+ more = true;
+ }
+
+ if (transfer_set_more(transfer, more) != 0)
+ {
+ break;
+ }
+
+ multi_transfer_amqp_value = amqpvalue_create_transfer(transfer);
+ if (multi_transfer_amqp_value == NULL)
+ {
+ break;
+ }
+
+ byte_counter = current_transfer_frame_payload_size;
+ while (byte_counter > 0)
+ {
+ if (payloads[temp_current_payload_index].length - temp_current_payload_pos >= byte_counter)
+ {
+ /* more data than we need */
+ temp_current_payload_pos += byte_counter;
+ byte_counter = 0;
+ }
+ else
+ {
+ byte_counter -= (uint32_t)payloads[temp_current_payload_index].length - temp_current_payload_pos;
+ temp_current_payload_index++;
+ temp_current_payload_pos = 0;
+ }
+ }
+
+ transfer_frame_payload_count = (uint32_t)(temp_current_payload_index - current_payload_index + 1);
+ transfer_frame_payloads = (PAYLOAD*)malloc(transfer_frame_payload_count * sizeof(PAYLOAD));
+ if (transfer_frame_payloads == NULL)
+ {
+ amqpvalue_destroy(multi_transfer_amqp_value);
+ break;
+ }
+
+ /* copy data */
+ byte_counter = current_transfer_frame_payload_size;
+ transfer_frame_payload_count = 0;
+
+ while (byte_counter > 0)
+ {
+ if (payloads[current_payload_index].length - current_payload_pos > byte_counter)
+ {
+ /* more data than we need */
+ transfer_frame_payloads[transfer_frame_payload_count].bytes = payloads[current_payload_index].bytes + current_payload_pos;
+ transfer_frame_payloads[transfer_frame_payload_count].length = byte_counter;
+ current_payload_pos += byte_counter;
+ byte_counter = 0;
+ }
+ else
+ {
+ /* copy entire payload and move to the next */
+ transfer_frame_payloads[transfer_frame_payload_count].bytes = payloads[current_payload_index].bytes + current_payload_pos;
+ transfer_frame_payloads[transfer_frame_payload_count].length = payloads[current_payload_index].length - current_payload_pos;
+ byte_counter -= (uint32_t)payloads[current_payload_index].length - current_payload_pos;
+ current_payload_index++;
+ current_payload_pos = 0;
+ }
+
+ transfer_frame_payload_count++;
+ }
+
+ if (connection_encode_frame(session_instance->endpoint, multi_transfer_amqp_value, transfer_frame_payloads, transfer_frame_payload_count, on_send_complete, callback_context) != 0)
+ {
+ free(transfer_frame_payloads);
+ amqpvalue_destroy(multi_transfer_amqp_value);
+ break;
+ }
+
+ free(transfer_frame_payloads);
+ amqpvalue_destroy(multi_transfer_amqp_value);
+ payload_size -= current_transfer_frame_payload_size;
+ }
+
+ if (payload_size > 0)
+ {
+ result = SESSION_SEND_TRANSFER_ERROR;
+ }
+ else
+ {
+ /* Codes_S_R_S_SESSION_01_018: [is incremented after each successive transfer according to RFC-1982 [RFC1982] serial number arithmetic.] */
+ session_instance->next_outgoing_id++;
+ session_instance->remote_incoming_window--;
+ session_instance->outgoing_window--;
+
+ result = SESSION_SEND_TRANSFER_OK;
+ }
+ }
+ }
+
+ amqpvalue_destroy(transfer_value);
+ }
+ }
+ }
+ }
+ }
+ }
+
+ return result;
+}