connect error handling

Author: you21979

example/subscribe.js

@@ -2,17 +2,23 @@ const ElectrumClient = require('..')
 const sleep = (ms) => new Promise((resolve,_) => setTimeout(() => resolve(), ms))
 
 const main = async () => {
-    const ecl = new ElectrumClient(995, 'btc.smsys.me', 'tls')
-    ecl.subscribe.on('server.peers.subscribe', console.log)
-    ecl.subscribe.on('blockchain.numblocks.subscribe', console.log)
-    ecl.subscribe.on('blockchain.headers.subscribe', console.log)
-    await ecl.connect()
-    const p1 = await ecl.serverPeers_subscribe()
-    const p2 = await ecl.blockchainHeaders_subscribe()
-    const p3 = await ecl.blockchainNumblocks_subscribe()
-    while(true){
-        await sleep(1000)
+    try{
+        const ecl = new ElectrumClient(995, 'btc.smsys.me', 'tls')
+        ecl.subscribe.on('server.peers.subscribe', console.log)
+        ecl.subscribe.on('blockchain.numblocks.subscribe', console.log)
+        ecl.subscribe.on('blockchain.headers.subscribe', console.log)
+        await ecl.connect()
+        const p1 = await ecl.serverPeers_subscribe()
+        const p2 = await ecl.blockchainHeaders_subscribe()
+        const p3 = await ecl.blockchainNumblocks_subscribe()
+        while(true){
+            await sleep(1000)
+            let version = await ecl.server_version("2.7.11", "1.0")
+        }
+        await ecl.close()
+    }catch(e){
+        console.log("error")
+        console.log(e)
     }
-    await ecl.close()
 }
 main()

lib/client.js

@@ -14,22 +14,37 @@ class Client{
         this.mp = new util.MessageParser((body, n) => {
             this.onMessage(body, n)
         })
+        this.status = 0
     }
 
     connect(){
+        if(this.status) {
+            return Promise.resolve()
+        }
+        this.status = 1
         return new Promise((resolve, reject) => {
+            const errorHandler = (e) => reject(e)
             this.conn.connect(this.port, this.host, () => {
+                this.conn.removeListener('error', errorHandler)
                 resolve()
             })
+            this.conn.on('error', errorHandler)
         })
     }
 
     close(){
+        if(!this.status) {
+            return
+        }
         this.conn.end()
         this.conn.destroy()
+        this.status = 0
     }
 
     request(method, params){
+        if(!this.status) {
+            return Promise.reject(new Error('ESOCKET'))
+        }
         return new Promise((resolve, reject) => {
             const id = ++this.id;
             const content = util.makeRequest(method, params, id);
@@ -82,6 +97,9 @@ class Client{
     onEnd(){
     }
 
+    onError(e){
+    }
+
 }
 
 module.exports = Client

lib/init_socket.js

@@ -21,14 +21,17 @@ const initSocket = (self, protocol, options) => {
     conn.on('connect', () => {
         self.onConnect()
     })
-    conn.on('close', () => {
-        self.onClose()
+    conn.on('close', (e) => {
+        self.onClose(e)
     })
     conn.on('data', (chunk) => {
         self.onRecv(chunk)
     })
-    conn.on('end', () => {
-        self.onEnd()
+    conn.on('end', (e) => {
+        self.onEnd(e)
+    })
+    conn.on('error', (e) => {
+        self.onError(e)
     })
     return conn
 }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "electrum-client",
-  "version": "0.0.3",
+  "version": "0.0.4",
   "description": "Electrum protocol client for node.js",
   "main": "index.js",
   "scripts": {