copy and modify json endpoint

tools/esp8266/app.cpp

@@ -574,6 +574,32 @@ String app::getJson(void) {
    return modJson;
 }
 
+//-----------------------------------------------------------------------------
+String app::getMetrics(void) {
+    DPRINTLN(DBG_VERBOSE, F("app::getMetrics"));
+    String metrics;
+    char headline[80];
+    
+    snprintf(headline, 80, "ahoy_solar_info{version=\"%s\",image=\"\",devicename=\"%s\"} 1", mVersion, mSysConfig.deviceName);
+    metrics += "# TYPE ahoy_solar_info gauge\n" + String(headline) + "\n";
+
+    for(uint8_t id = 0; id < mSys->getNumInverters(); id++) {
+        Inverter<> *iv = mSys->getInverterByPos(id);
+        if(NULL != iv) {
+            char type[40], topic[60], val[25];
+            for(uint8_t i = 0; i < iv->listLen; i++) {
+                uint8_t channel = iv->assign[i].ch;
+                if(channel == 0) {
+                    snprintf(type, 40, "# TYPE ahoy_solar_%s_ gauge", iv->getFieldName(i));
+                    snprintf(topic, 60, "ahoy_solar_%s_{inverter=\"%s\"}", iv->getFieldName(i), iv->name);
+                    snprintf(val, 25, "%.3f", iv->getValue(i));
+                    metrics += String(type) + "\n" + String(topic) + " " + String(val) + "\n";
+                }
+            }
+        }
+    }
+   return metrics;
+}
 
 //-----------------------------------------------------------------------------
 bool app::getWifiApActive(void) {

tools/esp8266/app.h

@@ -73,8 +73,10 @@ class app {
         void resetPayload(Inverter<>* iv);
         String getStatistics(void);
         String getJson(void);
+        String getMetrics(void);
         bool getWifiApActive(void);
         
+
         uint8_t getIrqPin(void) {
             return mConfig.pinIrq;
         }

tools/esp8266/web.cpp

@@ -71,6 +71,7 @@ void web::setup(void) {
     mWeb->on("/visualization",  std::bind(&web::showVisualization, this));
     mWeb->on("/livedata",       std::bind(&web::showLiveData,      this));
     mWeb->on("/json",           std::bind(&web::showJson,          this));
+    mWeb->on("/metrics",        std::bind(&web::showMetrics,       this));
     mWeb->on("/api", HTTP_POST, std::bind(&web::showWebApi,        this));
 }
 
@@ -568,6 +569,12 @@ void web::showJson(void) {
     mWeb->send(200, F("application/json"), mMain->getJson());
 }
 
+//-----------------------------------------------------------------------------
+void web::showMetrics(void) {
+    DPRINTLN(DBG_VERBOSE, F("web::showMetrics"));
+    mWeb->send(200, F("application/metrics"), mMain->getMetrics());
+}
+
 //-----------------------------------------------------------------------------
 void web::showWebApi(void)
 {

tools/esp8266/web.h

@@ -43,6 +43,7 @@ class web {
         void showLiveData(void);
         void showJson(void);
         void showWebApi(void);
+        void showMetrics(void);
 
     private:
         #ifdef ESP8266