Api wrapper to communicate with EVRYTHNG's Engine.
Dependencies: EthernetInterface mbed-rtos
Dependents: EvrythngApiExample
EvrythngApi.cpp
00001 /* 00002 * (c) Copyright 2012 EVRYTHNG Ltd London / Zurich 00003 * www.evrythng.com 00004 * 00005 * --- DISCLAIMER --- 00006 * 00007 * EVRYTHNG provides this source code "as is" and without warranty of any kind, 00008 * and hereby disclaims all express or implied warranties, including without 00009 * limitation warranties of merchantability, fitness for a particular purpose, 00010 * performance, accuracy, reliability, and non-infringement. 00011 * 00012 * Author: Michel Yerly 00013 * 00014 */ 00015 #include "EvrythngApi.h" 00016 00017 #include <string> 00018 00019 #include "util.h" 00020 #include "evry_error.h" 00021 #include "JsonParser.h" 00022 00023 //#define DEBUG_EVRYTHNG_API 00024 00025 using namespace std; 00026 00027 const int HTTP_OK = 200; 00028 00029 const char* THNG_PATH = "/thngs/"; 00030 const char* THNG_PROP_PATH = "/properties/"; 00031 00032 EvrythngApi::EvrythngApi(const string& token, const string& host, int port) 00033 { 00034 this->token = token; 00035 this->host = host; 00036 this->port = port; 00037 } 00038 00039 EvrythngApi::~EvrythngApi() 00040 { 00041 } 00042 00043 int EvrythngApi::getThngPropertyValue(const string& thngId, const string& key, string& value) 00044 { 00045 string path = THNG_PATH; 00046 path += thngId; 00047 path += THNG_PROP_PATH; 00048 path += key; 00049 path += "?from=latest"; 00050 string res; 00051 int err; 00052 int code; 00053 if ((err = httpGet(path, res, code)) != 0) return err; 00054 if (code != HTTP_OK) return EVRY_ERR_UNEXPECTEDHTTPSTATUS; 00055 JsonParser json; 00056 json.parse(res.c_str()); 00057 JsonValue* doc = json.getDocument(); 00058 const char* v = doc->getString("0/value"); 00059 if (v) { 00060 value.assign(v); 00061 return 0; 00062 } else { 00063 return -1; 00064 } 00065 } 00066 00067 int EvrythngApi::setThngPropertyValue(const std::string& thngId, const std::string& key, const std::string& value, int64_t timestamp) 00068 { 00069 char strTimestamp[21]; 00070 char* end; 00071 sprinti64(strTimestamp, timestamp, &end); 00072 *end = '\0'; 00073 00074 string path = THNG_PATH; 00075 path += thngId; 00076 path += THNG_PROP_PATH; 00077 path += key; 00078 00079 string json = "[{\"timestamp\":"; 00080 json += strTimestamp; 00081 json += ",\"value\":\""; 00082 json += value; 00083 json += "\"}]"; 00084 00085 string res; 00086 int err; 00087 int code; 00088 if ((err = httpPut(path, json, res, code)) != 0) return err; 00089 if (code != HTTP_OK) return EVRY_ERR_UNEXPECTEDHTTPSTATUS; 00090 00091 return 0; 00092 } 00093 00094 00095 int EvrythngApi::httpRequest(HttpMethod method, const string& path, const string& content, string& out, int& codeOut) 00096 { 00097 int ret; 00098 00099 const char* strMethod; 00100 switch (method) { 00101 case GET: 00102 strMethod = "GET"; 00103 break; 00104 case PUT: 00105 strMethod = "PUT"; 00106 break; 00107 case POST: 00108 strMethod = "POST"; 00109 break; 00110 case DELETE: 00111 strMethod = "DELETE"; 00112 break; 00113 default: 00114 return EVRY_ERR_UNSUPPORTED; 00115 } 00116 00117 char contentLength[16]; 00118 snprintf(contentLength, sizeof(contentLength), "%d", content.size()); 00119 00120 string req = strMethod; 00121 req += " "; 00122 req += path; 00123 req += " HTTP/1.0\r\n" 00124 "Host: "; 00125 req += host; 00126 req += "\r\n" 00127 "Accept: application/json\r\n" 00128 "Content-Length: "; 00129 req += contentLength; 00130 req += "\r\n" 00131 "Content-Type: application/json\r\n" 00132 "Connection: close\r\n" 00133 "Authorization: "; 00134 req += token; 00135 req += "\r\n\r\n"; 00136 00137 req += content; 00138 00139 #ifdef DEBUG_EVRYTHNG_API 00140 dbg.printf("%s\r\n\r\n", req.c_str()); 00141 #endif 00142 00143 TCPSocketConnection socket; 00144 00145 out.clear(); 00146 00147 string res; 00148 00149 if (socket.connect(host.c_str(), port) == 0) { 00150 00151 char* snd = new char[req.size()+1]; 00152 req.copy(snd, req.size()); 00153 snd[req.size()]='\0'; 00154 bool sent = socket.send_all(snd, req.size()) >= 0; 00155 delete[] snd; 00156 00157 if (sent) { 00158 00159 char rcv[256]; 00160 00161 int r; 00162 while (true) { 00163 r = socket.receive(rcv, sizeof(rcv)); 00164 if (r <= 0) 00165 break; 00166 res.append(rcv, r); 00167 } 00168 00169 ret = EVRY_ERR_OK; 00170 00171 } else { 00172 ret = EVRY_ERR_CANTSEND; 00173 } 00174 00175 socket.close(); 00176 00177 } else { 00178 ret = EVRY_ERR_CANTCONNECT; 00179 } 00180 00181 #ifdef DEBUG_EVRYTHNG_API 00182 dbg.printf("%s", res.c_str()); 00183 #endif 00184 00185 if (res.compare(0,5,"HTTP/") != 0) { 00186 return EVRY_ERR_UNKNOWN; 00187 } 00188 00189 int spPos = res.find(' ', 5); 00190 if (spPos == string::npos) { 00191 return EVRY_ERR_UNKNOWN; 00192 } 00193 00194 // TODO: check str length 00195 int code = atoi(res.c_str()+spPos+1); 00196 if (code < 100 || code > 999) { 00197 return EVRY_ERR_UNKNOWN; 00198 } 00199 codeOut = code; 00200 00201 int startContent = res.find("\r\n\r\n"); 00202 if (startContent != string::npos) { 00203 out.append(res.substr(startContent+4,res.size()-startContent-4)); 00204 } 00205 00206 return ret; 00207 } 00208 00209 int EvrythngApi::httpPut(const string& path, const string& json, string& out, int& codeOut) 00210 { 00211 return httpRequest(PUT, path, json, out, codeOut); 00212 } 00213 00214 int EvrythngApi::httpGet(const string& path, string& out, int& codeOut) 00215 { 00216 return httpRequest(GET, path, "", out, codeOut); 00217 } 00218 00219 int EvrythngApi::httpPost(const string& path, const string& json, string& out, int& codeOut) 00220 { 00221 return httpRequest(POST, path, json, out, codeOut); 00222 } 00223 00224 int EvrythngApi::httpDelete(const string& path, string& out, int& codeOut) 00225 { 00226 return httpRequest(DELETE, path, "", out, codeOut); 00227 }
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