fix(@embark/core): Prevent unnecessary re-renderings

The services websocket was initiated in the AppContainer and causing all child components to continuously re-render every time there was a service check (which is effectively every second). In addition, the socket was never stopped when not needed (ie when the services component was unmounted).

Create a ServicesContainer that initiates the websocket as part of the container, and stops the socket when the container is unmounted.

Move the ContractsList to be part of the ContractsContainer with a `mode` switch.

Add Deployment page title and description.

packages/embark-ui/src/actions/index.js

@@ -447,11 +447,13 @@ export const WATCH_SERVICES = 'WATCH_SERVICES';
 export const WATCH_NEW_CONTRACT_LOGS = 'WATCH_NEW_CONTRACT_LOGS';
 export const WATCH_NEW_CONTRACT_EVENTS = 'WATCH_NEW_CONTRACT_EVENTS';
 export const WATCH_CONTRACTS = 'WATCH_CONTRACTS';
+export const STOP_CONTRACTS = 'STOP_CONTRACTS';
 export const INIT_BLOCK_HEADER = 'INIT_BLOCK_HEADER';
 export const STOP_BLOCK_HEADER = 'STOP_BLOCK_HEADER';
 export const WATCH_GAS_ORACLE = 'WATCH_GAS_ORACLE';
 export const STOP_GAS_ORACLE = 'STOP_GAS_ORACLE';
 export const STOP_DEBUGGER = 'STOP_DEBUGGER';
+export const STOP_SERVICES = 'STOP_SERVICES';
 
 export function listenToProcessLogs(processName) {
   return {
@@ -509,12 +511,24 @@ export function listenToContracts(){
   };
 }
 
+export function stopContracts(){
+  return {
+    type: STOP_CONTRACTS
+  };
+}
+
 export function stopGasOracle(){
   return {
     type: STOP_GAS_ORACLE
   };
 }
 
+export function stopServices(){
+  return {
+    type: STOP_SERVICES
+  };
+}
+
 export function stopDebugger(){
   return {
     type: STOP_DEBUGGER

packages/embark-ui/src/components/Services.js

@@ -18,26 +18,26 @@ function iconClasses(state){
   });
 }
 
-const Process = ({process}) => (
+const Service = ({service}) => (
   <Col xs={12} sm={6} md={4} xl={3}>
-    <Widget02 header={process.name} mainText={process.description} icon={iconClasses(process.state)} color={colorClasses(process.state)} variant="1" />
+    <Widget02 header={service.name} mainText={service.description} icon={iconClasses(service.state)} color={colorClasses(service.state)} variant="1" />
   </Col>
 );
 
-Process.propTypes = {
-  process: PropTypes.object
+Service.propTypes = {
+  service: PropTypes.object
 };
 
-const Processes = ({processes}) => (
+const Services = ({services}) => (
   <Row>
-    {processes
+    {services
       .sort((a, b) => a.name < b.name ? 1 : 0)
-      .map((process) => <Process key={process.name} process={process} />)}
+      .map((service) => <Service key={service.name} service={service} />)}
   </Row>
 );
 
-Processes.propTypes = {
-  processes: PropTypes.arrayOf(PropTypes.object)
+Services.propTypes = {
+  services: PropTypes.arrayOf(PropTypes.object)
 };
 
-export default Processes;
+export default Services;

packages/embark-ui/src/containers/AppContainer.js

@@ -14,8 +14,6 @@ import {
   processes as processesAction,
   versions as versionsAction,
   plugins as pluginsAction,
-  listenToServices as listenToServicesAction,
-  listenToContracts as listenToContractsAction,
   initRegularTxs as initRegularTxsAction,
   stopRegularTxs as stopRegularTxsAction,
   changeTheme, fetchTheme
@@ -81,11 +79,8 @@ class AppContainer extends Component {
     }
 
     if (this.props.credentials.authenticated && !this.props.initialized) {
-      this.props.fetchProcesses();
-      this.props.fetchServices();
-      this.props.listenToServices();
       this.props.fetchPlugins();
-      this.props.listenToContracts();
+      this.props.fetchProcesses();
       if (enableRegularTxs === "true") {
         this.props.initRegularTxs();
         this.props.history.replace(stripQueryParam(this.props.location, ENABLE_REGULAR_TXS));
@@ -150,9 +145,7 @@ AppContainer.propTypes = {
   authenticate: PropTypes.func,
   logout: PropTypes.func,
   fetchCredentials: PropTypes.func,
-  initBlockHeader: PropTypes.func,
   fetchProcesses: PropTypes.func,
-  fetchServices: PropTypes.func,
   fetchPlugins: PropTypes.func,
   fetchVersions: PropTypes.func,
   location: PropTypes.object,
@@ -160,8 +153,6 @@ AppContainer.propTypes = {
   changeTheme: PropTypes.func,
   fetchTheme: PropTypes.func,
   history: PropTypes.object,
-  listenToServices: PropTypes.func,
-  listenToContracts: PropTypes.func,
   initRegularTxs: PropTypes.func,
   stopRegularTxs: PropTypes.func
 };
@@ -182,13 +173,10 @@ export default withRouter(connect(
     logout: logout.request,
     fetchCredentials: fetchCredentials.request,
     fetchProcesses: processesAction.request,
-    fetchServices: processesAction.request,
-    listenToServices: listenToServicesAction,
     fetchVersions: versionsAction.request,
     fetchPlugins: pluginsAction.request,
     changeTheme: changeTheme.request,
     fetchTheme: fetchTheme.request,
-    listenToContracts: listenToContractsAction,
     initRegularTxs: initRegularTxsAction.request,
     stopRegularTxs: stopRegularTxsAction.request
   },

packages/embark-ui/src/containers/ContractsContainer.js

@@ -1,9 +1,14 @@
 import React, {Component} from 'react';
 import {connect} from 'react-redux';
 import PropTypes from 'prop-types';
-import {contracts as contractsAction} from "../actions";
+import {
+  listenToContracts as listenToContractsAction,
+  stopContracts as stopContractsAction,
+  contracts as contractsAction
+} from "../actions";
 
 import Contracts from '../components/Contracts';
+import ContractsList from '../components/ContractsList';
 import DataWrapper from "../components/DataWrapper";
 import PageHead from "../components/PageHead";
 import {getContracts} from "../reducers/selectors";
@@ -11,15 +16,21 @@ import {getContracts} from "../reducers/selectors";
 class ContractsContainer extends Component {
   componentDidMount() {
     this.props.fetchContracts();
+    this.props.listenToContracts();
+  }
+
+  componentWillUnmount() {
+    this.props.stopContracts();
   }
 
   render() {
     return (
       <React.Fragment>
-        <PageHead title="Contracts" description="Summary of all deployed contracts" />
-        <DataWrapper shouldRender={this.props.contracts.length > 0} {...this.props} render={({contracts}) => (
-            <Contracts contracts={contracts} />
-        )} />
+        {this.props.updatePageHeader && <PageHead title="Contracts" description="Summary of all deployed contracts" />}
+        <DataWrapper shouldRender={this.props.contracts.length > 0} {...this.props} render={({contracts}) => {
+            if (this.props.mode === "list") return <ContractsList contracts={contracts} />;
+            if (this.props.mode === "detail") return <Contracts contracts={contracts} />; 
+        }} />
       </React.Fragment>
     );
   }
@@ -33,13 +44,24 @@ function mapStateToProps(state) {
 }
 
 ContractsContainer.propTypes = {
+  listenToContracts: PropTypes.func,
+  stopContracts: PropTypes.func,
   contracts: PropTypes.array,
   fiddleContracts: PropTypes.array,
-  fetchContracts: PropTypes.func
+  fetchContracts: PropTypes.func,
+  mode: PropTypes.string,
+  updatePageHeader: PropTypes.bool
 };
 
+ContractsContainer.defaultProps = {
+  mode: "detail",
+  updatePageHeader: true
+}
+
 export default connect(
   mapStateToProps,{
+    listenToContracts: listenToContractsAction,
+    stopContracts: stopContractsAction,
     fetchContracts: contractsAction.request
   }
 )(ContractsContainer);

packages/embark-ui/src/containers/DeploymentContainer.js

@@ -9,6 +9,7 @@ import {
 
 import ContractsDeployment from '../components/ContractsDeployment';
 import DataWrapper from "../components/DataWrapper";
+import PageHead from '../components/PageHead';
 import {getContracts, getDeploymentPipeline, getWeb3, getWeb3GasEstimates, getWeb3Deployments} from "../reducers/selectors";
 
 class DeploymentContainer extends Component {
@@ -18,16 +19,19 @@ class DeploymentContainer extends Component {
 
   render() {
     return (
-      <DataWrapper shouldRender={this.props.contracts.length > 0} {...this.props} render={() => (
-        <ContractsDeployment contracts={this.props.contracts}
-                             deploymentPipeline={this.props.deploymentPipeline}
-                             web3={this.props.web3}
-                             web3Deploy={this.props.web3Deploy}
-                             web3EstimateGas={this.props.web3EstimateGas}
-                             web3Deployments={this.props.web3Deployments}
-                             web3GasEstimates={this.props.web3GasEstimates}
-                             updateDeploymentPipeline={this.props.updateDeploymentPipeline} />
-      )} />
+      <React.Fragment>
+        <PageHead title="Deployment" description="Deploy your contracts using Embark or a web3-enabled browser such as Mist or MetaMask." />
+        <DataWrapper shouldRender={this.props.contracts.length > 0} {...this.props} render={() => (
+          <ContractsDeployment contracts={this.props.contracts}
+                              deploymentPipeline={this.props.deploymentPipeline}
+                              web3={this.props.web3}
+                              web3Deploy={this.props.web3Deploy}
+                              web3EstimateGas={this.props.web3EstimateGas}
+                              web3Deployments={this.props.web3Deployments}
+                              web3GasEstimates={this.props.web3GasEstimates}
+                              updateDeploymentPipeline={this.props.updateDeploymentPipeline} />
+        )} />
+      </React.Fragment>
     );
   }
 }

packages/embark-ui/src/containers/HomeContainer.js

@@ -18,12 +18,12 @@ import {
 } from "../actions";
 
 import DataWrapper from "../components/DataWrapper";
-import Processes from '../components/Processes';
 import Console from '../components/Console';
 import {EMBARK_PROCESS_NAME, LOG_LIMIT} from '../constants';
-import ContractsList from '../components/ContractsList';
 import PageHead from '../components/PageHead';
+import ServicesContainer from './ServicesContainer';
 import {getContracts, getProcesses, getProcessLogs, getServices, getCommandSuggestions} from "../reducers/selectors";
+import ContractsContainer from "./ContractsContainer";
 
 class HomeContainer extends Component {
   constructor(props) {
@@ -53,9 +53,7 @@ class HomeContainer extends Component {
     return (
       <React.Fragment>
         <PageHead title="Dashboard" description="Overview of available services and logs. Interact with Embark using the console. Summary of deployed contracts." />
-        <DataWrapper shouldRender={this.props.services.length > 0 } {...this.props} render={({services}) => (
-          <Processes processes={services} />
-        )} />
+        <ServicesContainer />
 
         <DataWrapper shouldRender={this.props.processes.length > 0 } {...this.props} render={({processes, postCommand, postCommandSuggestions, processLogs, commandSuggestions}) => (
           <Card>
@@ -78,7 +76,7 @@ class HomeContainer extends Component {
             <CardBody>
               <CardTitle>Deployed Contracts</CardTitle>
               <div style={{marginBottom: '1.5rem', overflow: 'auto'}}>
-                <ContractsList contracts={contracts} />
+                <ContractsContainer contracts={contracts} mode="list" updatePageHeader={false} />
               </div>
             </CardBody>
           </Card>

packages/embark-ui/src/containers/ServicesContainer.js

@@ -0,0 +1,49 @@
+import PropTypes from "prop-types";
+import React, {Component} from 'react';
+import {connect} from 'react-redux';
+import Services from '../components/Services';
+import {
+  listenToServices as listenToServicesAction, 
+  services as servicesAction,
+  stopServices as stopServicesAction
+} from "../actions";
+import DataWrapper from "../components/DataWrapper";
+import {getServices} from "../reducers/selectors";
+
+class ServicesContainer extends Component {
+  componentDidMount() {
+    this.props.fetchServices();
+    this.props.listenToServices();
+  }
+
+  componentWillUnmount() {
+    this.props.stopServices();
+  }
+
+  render() {
+    return <DataWrapper shouldRender={this.props.services.length > 0 } {...this.props} render={({services}) => (
+        <Services services={services} />
+      )} />;
+
+  }
+}
+
+ServicesContainer.propTypes = {
+  fetchServices: PropTypes.func,
+  listenToServices: PropTypes.func,
+};
+
+function mapStateToProps(state, _props) {
+  return {
+    services: getServices(state)
+  };
+}
+
+export default connect(
+  mapStateToProps,
+  {
+    fetchServices: servicesAction.request,
+    listenToServices: listenToServicesAction,
+    stopServices: stopServicesAction
+  }
+)(ServicesContainer);

packages/embark-ui/src/sagas/index.js

@@ -420,7 +420,15 @@ export function *listenServices() {
   const socket = api.webSocketServices(credentials);
   const channel = yield call(createChannel, socket);
   while (true) {
-    const services = yield take(channel);
+    const { cancel, services } = yield race({
+      services: take(channel),
+      cancel: take(actions.STOP_SERVICES)
+    });
+
+    if (cancel) {
+      channel.close();
+      return;
+    }
     yield put(actions.services.success(services));
   }
 }
@@ -506,7 +514,15 @@ export function *listenContracts() {
   const socket = api.webSocketContracts(credentials);
   const channel = yield call(createChannel, socket);
   while (true) {
-    const contracts = yield take(channel);
+    const { cancel, contracts } = yield race({
+      contracts: take(channel),
+      cancel: take(actions.STOP_CONTRACTS)
+    });
+
+    if (cancel) {
+      channel.close();
+      return;
+    }
     yield put(actions.contracts.success(contracts));
   }
 }