File content as of revision 20:abfbaf524192:

/**
 * @file    DynamicResource.cpp
 * @brief   mbed CoAP Endpoint Dynamic Resource class
 * @author  Doug Anson/Chris Paola
 * @version 1.0
 * @see
 *
 * Copyright (c) 2014
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "DynamicResource.h"

// InstancePointerTable Helper
#include "InstancePointerTableHelper.h"

// default constructor
DynamicResource::DynamicResource(const Logger *logger,const char *name,const char *res_type,uint8_t res_mask,const bool observable) : Resource<string>(logger,string(name),string(""))
{
    this->m_res_type = string(res_type);
    this->m_observable = observable;
    this->m_res_mask = res_mask;
}

// constructor (input initial value)
DynamicResource::DynamicResource(const Logger *logger,const char *name,const char *res_type,const string value,uint8_t res_mask,const bool observable) : Resource<string>(logger,string(name),value)
{
    this->m_res_type = string(res_type);
    this->m_observable = observable;
    this->m_res_mask = res_mask;
}

// constructor (strings)
DynamicResource::DynamicResource(const Logger *logger,const string name,const string res_type,const string value,uint8_t res_mask,const bool observable) : Resource<string>(logger,name,value)
{
    this->m_res_type = res_type;
    this->m_observable = observable;
    this->m_res_mask = res_mask;
}

// copy constructor
DynamicResource::DynamicResource(const DynamicResource &resource) : Resource<string>((const Resource<string> &)resource)
{
    this->m_res_type = resource.m_res_type;
    this->m_observable = resource.m_observable;
    this->m_res_mask = resource.m_res_mask;
}

// destructor
DynamicResource::~DynamicResource()
{
}

// bind resource to NSDL
void DynamicResource::bind(void *p)
{
    if (p != NULL) {
        sn_nsdl_resource_info_s *resource_ptr = (sn_nsdl_resource_info_s *)p;
        const uint8_t *name = (const uint8_t *)(this->getName().c_str());
        const uint8_t *res_type = (const uint8_t *)this->m_res_type.c_str();
        int name_length = this->getName().size();
        int res_type_length = this->m_res_type.size();
        int is_observable = 0;
        if (this->m_observable == true) is_observable = 1;
        const string *key = new string(this->getName());
        ipt_helper_add_instance_pointer(key,this);
        nsdl_create_dynamic_resource(resource_ptr,name_length,(uint8_t *)name,res_type_length,(uint8_t *)res_type,is_observable,&ipt_helper_nsdl_callback_stub,this->m_res_mask);
        this->logger()->log("DynamicResource: [%s] type: [%s] bound (observable: %d)",name,res_type,is_observable);
    } else {
        this->logger()->log("DynamicResource: NULL parameter in bind()");
    }
}

// process NSDL message
uint8_t DynamicResource::process(sn_coap_hdr_s *received_coap_ptr, sn_nsdl_addr_s *address, sn_proto_info_s *proto)
{
    sn_coap_hdr_s *coap_res_ptr = 0;

    // create our key for debugging output...
    string key = this->coapDataToString(received_coap_ptr->uri_path_ptr,received_coap_ptr->uri_path_len);

    if(received_coap_ptr->msg_code == COAP_MSG_CODE_REQUEST_GET) {
        coap_res_ptr = sn_coap_build_response(received_coap_ptr, COAP_MSG_CODE_RESPONSE_CONTENT);

        // process the GET if we have registered a callback for it...
        if ((this->m_res_mask&SN_GRS_GET_ALLOWED) != 0) {
            // call the resource get() to get the resource value
            this->logger()->log("Calling resource(GET) for [%s]...",key.c_str());
            string value = this->get();

            // convert the string from the GET to something suitable for CoAP payloads
            this->logger()->log("Building payload for [%s]=[%s]...",key.c_str(),value.c_str());
            int length = value.size();
            char value_buffer[MAX_VALUE_BUFFER_LENGTH+1];
            if (length > MAX_VALUE_BUFFER_LENGTH) length = MAX_VALUE_BUFFER_LENGTH;
            memset(value_buffer,0,MAX_VALUE_BUFFER_LENGTH+1);
            memcpy(value_buffer,value.c_str(),length);

            // fill in the CoAP response payload
            coap_res_ptr->payload_len = length;
            coap_res_ptr->payload_ptr = (uint8_t *)value_buffer;

            // build out the response and send...
            sn_nsdl_send_coap_message(address, coap_res_ptr);
        } else {
            this->logger()->log("ERROR: resource(GET) mask is munged (mask: 0x%x)",this->m_res_mask);
        }
    } else if(received_coap_ptr->msg_code == COAP_MSG_CODE_REQUEST_PUT) {
        if(received_coap_ptr->payload_len > 0) {
            // process the PUT if we have registered a callback for it...
            if ((this->m_res_mask&SN_GRS_PUT_ALLOWED) != 0) {
                // binder interacts only with strings
                string value = this->coapDataToString(received_coap_ptr->payload_ptr,received_coap_ptr->payload_len);

                // call the resource put() to set the resource value
                this->logger()->log("Calling resource(PUT) with [%s]=[%s]...",key.c_str(),value.c_str());
                this->put(value);

                // build out the response and send...
                this->logger()->log("resource(PUT) completed for [%s]...",key.c_str());
                coap_res_ptr = sn_coap_build_response(received_coap_ptr, COAP_MSG_CODE_RESPONSE_CHANGED);
                sn_nsdl_send_coap_message(address, coap_res_ptr);
            } else {
                this->logger()->log("ERROR: resource(PUT) mask is munged (mask: 0x%x)",this->m_res_mask);
            }
        } else {
            this->logger()->log("ERROR: Binder(PUT) payload is NULL...");
        }
    }

    sn_coap_parser_release_allocated_coap_msg_mem(coap_res_ptr);

    return 0;
}

// default PUT (does nothing)
void DynamicResource::put(const string value)
{
    // not used by default
    ;
}

// convenience method to get the URI from its buffer field...
string DynamicResource::coapDataToString(uint8_t *coap_data_ptr,int coap_data_ptr_length)
{
    if (coap_data_ptr != NULL && coap_data_ptr_length > 0) {
        char buf[MAX_VALUE_BUFFER_LENGTH+1];
        memset(buf,0,MAX_VALUE_BUFFER_LENGTH+1);
        memcpy(buf,(char *)coap_data_ptr,coap_data_ptr_length);
        return string(buf);
    }
    return string("");
}