File content as of revision 0:b438482ebbfc:

/**
 * @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;
        std::printf("DynamicResource: name[%s] type:[%s] mask: 0x%.2x\r\n",this->getName().c_str(),this->m_res_type.c_str(),this->m_res_mask);
        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);
        std::printf("DynamicResource[%s(%d)] type: %s(%d) bound mask: 0x%.2x\r\n",name,name_length,res_type,res_type_length,this->m_res_mask);
    }
    else {
        std::printf("DynamicResource: NULL parameter in bind()\r\n");
    }
 }

 // 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)
    {        
        std::printf("GET requested for [%s]...\r\n",key.c_str());
        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
            std::printf("Calling resource(GET) for [%s]...\r\n",key.c_str());
            string value = this->get();
        
            // convert the string from the GET to something suitable for CoAP payloads    
            std::printf("Building payload for [%s]=[%s]...\r\n",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 {
            std::printf("ERROR: resource(GET) mask is munged (mask: 0x%x)\r\n",this->m_res_mask);
        }
    }
    else if(received_coap_ptr->msg_code == COAP_MSG_CODE_REQUEST_PUT)
    {
        std::printf("PUT requested for [%s]...\r\n",key.c_str());
        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
                std::printf("Calling resource(PUT) with [%s]=[%s]...\r\n",key.c_str(),value.c_str());
                this->put(value);
            
                // build out the response and send...
                std::printf("resource(PUT) completed for [%s]...\r\n",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 {
                std::printf("ERROR: resource(PUT) mask is munged (mask: 0x%x)\r\n",this->m_res_mask);
            }
        }
        else {
            std::printf("ERROR: Binder(PUT) payload is NULL...\r\n");
        }
    }

    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("");
 }