From 90d67f0c72ea60ea5869e696050f7f90aa0bcc75 Mon Sep 17 00:00:00 2001
From: hatim boufnichel <boufni95@gmail.com>
Date: Sat, 5 Sep 2020 17:40:08 +0200
Subject: [PATCH] error manager

---
 utils/lightningServices/errors.js | 142 ++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 utils/lightningServices/errors.js

diff --git a/utils/lightningServices/errors.js b/utils/lightningServices/errors.js
new file mode 100644
index 00000000..f1051099
--- /dev/null
+++ b/utils/lightningServices/errors.js
@@ -0,0 +1,142 @@
+
+const LightningServices = require('./lightning-services')
+
+/**
+ * @typedef {{
+ * code:number,
+ * details:string,
+ * message:string
+ * }} LNDError 
+ */
+
+/**
+ * @typedef {(err:LNDError,response:object)=>void} HealthListener 
+ */
+
+class LNDErrorManager {
+
+  /**
+   * @type {boolean}
+   */
+  _isCheckingHealth = false
+
+  /**
+   * @type {HealthListener[]}
+   */
+  _healthListeners = []
+
+  getAvailableService(){
+    
+    //require('shock-common').Utils.makePromise((res, rej) => ...)
+    return new Promise((res,rej)=>{
+      if(!this._isCheckingHealth){
+        this._isCheckingHealth = true
+        this.getInfo()
+      }
+      /**
+       * 
+       * @param {LNDError} err 
+       * @param {object} response 
+       */
+      const listener = (err,response)=>{
+        if (err) {
+          if (err.code === 12) {
+            res({
+              service: 'walletUnlocker',
+              message: 'Wallet locked',
+              code: err.code,
+              walletStatus: 'locked',
+              success: true
+            })
+          } else if (err.code === 14) {
+            rej({
+              service: 'unknown',
+              message:
+                "Failed to connect to LND server, make sure it's up and running.",
+              code: 14,
+              walletStatus: 'unknown',
+              success: false
+            })
+          } else {
+            rej({
+              service: 'lightning',
+              message: this.sanitizeLNDError(err),
+              code: err.code,
+              walletStatus: 'unlocked',
+              success: false
+            })
+          }
+        }
+  
+        res({
+          service: 'lightning',
+          message: response,
+          code: null,
+          walletStatus: 'unlocked',
+          success: true
+        })
+        
+      }
+      this._healthListeners.push(listener)
+    })
+
+  }
+
+  //private
+  getInfo(){
+    const { lightning } = LightningServices.services
+    /**
+     * 
+     * @param {LNDError} err 
+     * @param {object} response 
+     */
+    const callback = (err, response) => {
+      this._healthListeners.forEach(l =>{
+        l(err,response)
+      })
+      this._healthListeners.length = 0
+      this._isCheckingHealth = false
+    }
+    const deadline = Date.now() + 2000
+    lightning.getInfo({},{deadline}, callback)
+  }
+
+  /**
+   * @param {LNDError} e 
+   */
+  handleError(e){
+    return this.sanitizeLNDError(e)
+  }
+
+  /**
+   * @param {LNDError} e 
+   */
+  // eslint-disable-next-line
+  sanitizeLNDError(e){
+    let eMessage = ''
+    if(typeof e === 'string'){
+      eMessage = e
+    }else if(e.details){
+      eMessage = e.details
+    } else if(e.message){
+      eMessage = e.message
+    }
+    if (eMessage.toLowerCase().includes('unknown')) {
+      const splittedMessage = eMessage.split('UNKNOWN: ')
+      return splittedMessage.length > 1
+        ? splittedMessage.slice(1).join('')
+        : splittedMessage.join('')
+    }
+    if(eMessage === ''){
+      return 'unknown LND error'
+    }
+    return eMessage
+  }
+
+  
+}
+
+
+const lndErrorManager = new LNDErrorManager()
+
+module.exports = lndErrorManager
\ No newline at end of file