Implement connection-checking

src/main.js

@@ -15,6 +15,7 @@ const { PacketStreamFactory } = require("./streamHandler/PacketStreamFactory.js"
 const { PacketInfluxPointFactory } = require("./streamHandler/PacketInfluxPointFactory.js");
 const { InfluxPointWriter } = require("./streamHandler/InfluxPointWriter.js");
 const { InfluxDbLineProtocolWriter } = require("./streamHandler/InfluxDbLineProtocolWriter.js");
+const { InfluxPointToLineProtoStream } = require("./streamHandler/InfluxPointToLineProtoStream.js");
 
 const userHelper = require("./helper/userHelper.js");
 
@@ -77,6 +78,37 @@ if(errorMsg){
     else {
         logger.info("Setup Influxdb-LineProtocol..");
 
+        let lineProtocolWriter = new InfluxDbLineProtocolWriter(env.INFLUXDB_LINEPROTOCOL_HOST, env.INFLUXDB_LINEPROTOCOL_PORT);
+
+        logger.debug("Create PointToLineProto and pipe to LineProtocolWriter");
+        pointWriter = new InfluxPointToLineProtoStream();
+        pointWriter
+            .setEncoding("utf8")
+            .pipe(lineProtocolWriter);
+        
+        logger.debug("Waiting for connection..");
+        await new Promise((resolve, reject) => {
+            lineProtocolWriter.once("connect", () => {
+                resolve();
+            });
+            lineProtocolWriter.once("error", (err) => {
+                reject(err);
+            });
+            setTimeout(() => {  // After timeout, reject promise
+                reject("Timeout whilst waiting to connect");
+            }, 6500);
+        })
+            .then(() => {
+                logger.info("Influxdb-LineProtocol ok");
+            })
+            .catch((err) => {
+                if(err) {
+                    logger.error("Error whilst checking Influxdb-LineProtocol:");
+                    logger.error(err);
+                }
+                logger.fatal("Setup Influxdb-LineProtocol failed!");
+                exit(1);
+            });
     }
 
     logger.info("Starting tcpdump..");
@@ -88,13 +120,12 @@ if(errorMsg){
     let regexBlockStream = new RegexBlockStream(/^\d{2}:\d{2}:\d{2}.\d{6}.*(\n( {4,8}|\t\t?).*)+\n/gm);
     let packetStreamFactory = new PacketStreamFactory();
     let packetInfluxPointFactory = new PacketInfluxPointFactory();
-    let influxPointWriter = new InfluxPointWriter(influxWriteApi);
     proc.stdout
         .setEncoding("utf8")
         .pipe(regexBlockStream)
         .pipe(packetStreamFactory)
         .pipe(packetInfluxPointFactory)
-        .pipe(influxPointWriter);
+        .pipe(pointWriter);
 
     logger.debug("Attaching error-logger..");
     const loggerTcpdump = logFactory("tcpdump");