refactor switchprovider method

libs/remix-debug/src/cmdline/contextManager.js

@@ -0,0 +1,57 @@
+const remixLib = require('@remix-project/remix-lib')
+
+const EventManager = remixLib.EventManager
+const Web3Providers = remixLib.vm.Web3Providers
+const DummyProvider = remixLib.vm.DummyProvider
+const init = remixLib.init
+
+class ContextManager {
+  constructor (executionContext) {
+    this.executionContext = executionContext
+    this.web3 = this.executionContext.web3()
+    this.event = new EventManager()
+  }
+
+  initProviders () {
+    this.web3Providers = new Web3Providers()
+    this.addProvider('DUMMYWEB3', new DummyProvider())
+    this.switchProvider('DUMMYWEB3')
+
+    this.addProvider('vm', this.executionContext.vm())
+    this.addProvider('injected', this.executionContext.internalWeb3())
+    this.addProvider('web3', this.executionContext.internalWeb3())
+    this.switchProvider(this.executionContext.getProvider())
+  }
+
+  getWeb3 () {
+    return this.web3
+  }
+
+  addProvider (type, obj) {
+    this.web3Providers.addProvider(type, obj)
+    this.event.trigger('providerAdded', [type])
+  }
+
+  switchProvider(type, cb) {
+    this.web3Providers.get(type, (error, obj) => {
+      if (error) {
+        return console.log('provider ' + type + ' not defined')
+      }
+      this.web3 = obj
+      this.executionContext.detectNetwork((error, network) => {
+        if (error || !network) {
+          this.web3 = obj
+        } else {
+          var webDebugNode = init.web3DebugNode(network.name)
+          this.web3 = (!webDebugNode ? obj : webDebugNode)
+        }
+        this.event.trigger('providerChanged', [type, this.web3])
+        if (cb) return cb()
+      })
+      this.event.trigger('providerChanged', [type, this.web3])
+    })
+  }
+
+}
+
+module.exports = ContextManager