cmd, dashboard: dashboard using React, Material-UI, Recharts

.gitignore

@@ -33,3 +33,6 @@ profile.cov
 
 # IdeaIDE
 .idea
+
+# dashboard
+/dashboard/assets/node_modules

cmd/geth/config.go

@@ -30,6 +30,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/contracts/release"
+	"github.com/ethereum/go-ethereum/dashboard"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/node"
 	"github.com/ethereum/go-ethereum/params"
@@ -76,10 +77,11 @@ type ethstatsConfig struct {
 }
 
 type gethConfig struct {
-	Eth      eth.Config
+	Eth       eth.Config
-	Shh      whisper.Config
+	Shh       whisper.Config
-	Node     node.Config
+	Node      node.Config
-	Ethstats ethstatsConfig
+	Ethstats  ethstatsConfig
+	Dashboard dashboard.Config
 }
 
 func loadConfig(file string, cfg *gethConfig) error {
@@ -110,9 +112,10 @@ func defaultNodeConfig() node.Config {
 func makeConfigNode(ctx *cli.Context) (*node.Node, gethConfig) {
 	// Load defaults.
 	cfg := gethConfig{
-		Eth:  eth.DefaultConfig,
+		Eth:       eth.DefaultConfig,
-		Shh:  whisper.DefaultConfig,
+		Shh:       whisper.DefaultConfig,
-		Node: defaultNodeConfig(),
+		Node:      defaultNodeConfig(),
+		Dashboard: dashboard.DefaultConfig,
 	}
 
 	// Load config file.
@@ -134,6 +137,7 @@ func makeConfigNode(ctx *cli.Context) (*node.Node, gethConfig) {
 	}
 
 	utils.SetShhConfig(ctx, stack, &cfg.Shh)
+	utils.SetDashboardConfig(ctx, &cfg.Dashboard)
 
 	return stack, cfg
 }
@@ -153,6 +157,9 @@ func makeFullNode(ctx *cli.Context) *node.Node {
 
 	utils.RegisterEthService(stack, &cfg.Eth)
 
+	if ctx.GlobalBool(utils.DashboardEnabledFlag.Name) {
+		utils.RegisterDashboardService(stack, &cfg.Dashboard)
+	}
 	// Whisper must be explicitly enabled by specifying at least 1 whisper flag or in dev mode
 	shhEnabled := enableWhisper(ctx)
 	shhAutoEnabled := !ctx.GlobalIsSet(utils.WhisperEnabledFlag.Name) && ctx.GlobalIsSet(utils.DeveloperFlag.Name)

cmd/geth/main.go

@@ -61,6 +61,11 @@ var (
 		utils.DataDirFlag,
 		utils.KeyStoreDirFlag,
 		utils.NoUSBFlag,
+		utils.DashboardEnabledFlag,
+		utils.DashboardAddrFlag,
+		utils.DashboardPortFlag,
+		utils.DashboardRefreshFlag,
+		utils.DashboardAssetsFlag,
 		utils.EthashCacheDirFlag,
 		utils.EthashCachesInMemoryFlag,
 		utils.EthashCachesOnDiskFlag,

cmd/geth/usage.go

@@ -25,6 +25,7 @@ import (
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/internal/debug"
 	"gopkg.in/urfave/cli.v1"
+	"strings"
 )
 
 // AppHelpTemplate is the test template for the default, global app help topic.
@@ -97,6 +98,16 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.EthashDatasetsOnDiskFlag,
 		},
 	},
+	//{
+	//	Name: "DASHBOARD",
+	//	Flags: []cli.Flag{
+	//		utils.DashboardEnabledFlag,
+	//		utils.DashboardAddrFlag,
+	//		utils.DashboardPortFlag,
+	//		utils.DashboardRefreshFlag,
+	//		utils.DashboardAssetsFlag,
+	//	},
+	//},
 	{
 		Name: "TRANSACTION POOL",
 		Flags: []cli.Flag{
@@ -268,6 +279,9 @@ func init() {
 			uncategorized := []cli.Flag{}
 			for _, flag := range data.(*cli.App).Flags {
 				if _, ok := categorized[flag.String()]; !ok {
+					if strings.HasPrefix(flag.GetName(), "dashboard") {
+						continue
+					}
 					uncategorized = append(uncategorized, flag)
 				}
 			}

cmd/utils/flags.go

@@ -38,6 +38,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/dashboard"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/eth/downloader"
 	"github.com/ethereum/go-ethereum/eth/gasprice"
@@ -183,6 +184,31 @@ var (
 		Name:  "lightkdf",
 		Usage: "Reduce key-derivation RAM & CPU usage at some expense of KDF strength",
 	}
+	// Dashboard settings
+	DashboardEnabledFlag = cli.BoolFlag{
+		Name:  "dashboard",
+		Usage: "Enable the dashboard",
+	}
+	DashboardAddrFlag = cli.StringFlag{
+		Name:  "dashboard.addr",
+		Usage: "Dashboard listening interface",
+		Value: dashboard.DefaultConfig.Host,
+	}
+	DashboardPortFlag = cli.IntFlag{
+		Name:  "dashboard.host",
+		Usage: "Dashboard listening port",
+		Value: dashboard.DefaultConfig.Port,
+	}
+	DashboardRefreshFlag = cli.DurationFlag{
+		Name:  "dashboard.refresh",
+		Usage: "Dashboard metrics collection refresh rate",
+		Value: dashboard.DefaultConfig.Refresh,
+	}
+	DashboardAssetsFlag = cli.StringFlag{
+		Name:  "dashboard.assets",
+		Usage: "Developer flag to serve the dashboard from the local file system (default: \"\")",
+		Value: dashboard.DefaultConfig.Assets,
+	}
 	// Ethash settings
 	EthashCacheDirFlag = DirectoryFlag{
 		Name:  "ethash.cachedir",
@@ -1019,6 +1045,14 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
 	}
 }
 
+// SetDashboardConfig applies dashboard related command line flags to the config.
+func SetDashboardConfig(ctx *cli.Context, cfg *dashboard.Config) {
+	cfg.Host = ctx.GlobalString(DashboardAddrFlag.Name)
+	cfg.Port = ctx.GlobalInt(DashboardPortFlag.Name)
+	cfg.Refresh = ctx.GlobalDuration(DashboardRefreshFlag.Name)
+	cfg.Assets = ctx.GlobalString(DashboardAssetsFlag.Name)
+}
+
 // RegisterEthService adds an Ethereum client to the stack.
 func RegisterEthService(stack *node.Node, cfg *eth.Config) {
 	var err error
@@ -1041,6 +1075,13 @@ func RegisterEthService(stack *node.Node, cfg *eth.Config) {
 	}
 }
 
+// RegisterDashboardService adds a dashboard to the stack.
+func RegisterDashboardService(stack *node.Node, cfg *dashboard.Config) {
+	stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
+		return dashboard.New(cfg)
+	})
+}
+
 // RegisterShhService configures Whisper and adds it to the given node.
 func RegisterShhService(stack *node.Node, cfg *whisper.Config) {
 	if err := stack.Register(func(n *node.ServiceContext) (node.Service, error) {

dashboard/README.md

@@ -0,0 +1,62 @@
+## Go Ethereum Dashboard
+### Description
+
+The dashboard is a data visualizer integrated into geth, intended to collect and visualize useful information of an Ethereum node. 
+The dashboard consists of two parts:
+* The server listens to connections, collects data with a given refresh rate, and updates the dashboards through the opened connections.
+* The client waits for update messages, updates the content and tries to reconnect on connection loss.
+
+### Users
+#### Installation steps
+
+1. `cd .../go-ethereum/`
+1. `go install -v ./cmd/geth`
+1. Run the server with `geth --rinkeby --dashboard --vmodule=dashboard=5 --metrics`.
+1. Enter `localhost:8080` (or change the configuration).
+
+### Developers
+
+The client's UI is maintained by [React][React], the facebook's JavaScript library.
+
+The [ESLint pluggable linting utility][ESLint] validates the JSX syntax mostly according to the [Airbnb React/JSX Style Guide][Airbnb], the style is defined in the `.eslintrc` configuration file.
+
+[Webpack module bundler][Webpack] is used for bundling the resources in order to gain cost efficiency and maintainability.
+The resources are bundled into a single JS file (`bundle.js`), which is referenced from the main html file. 
+This JS file also takes part in the `assets.go`.
+
+[Node.js][Node.js] is used for installing the necessary dependencies for the module bundler.
+
+#### Installation steps
+
+_Module bundler_
+
+1. `cd .../go-ethereum/dashboard/assets/`
+1. `npm install`
+1. `./node_modules/.bin/webpack` // check out `webpack.config.js`
+    * Optionally use `--watch` to automatically bundle the resources on change.
+
+_Server_
+
+1. Bundle the resources.
+1. `cd .../go-ethereum/`.
+1. `go generate ./dashboard && go install -v ./cmd/geth`.
+1. Run the server with `geth --rinkeby --dashboard --vmodule=dashboard=5 --metrics console`.
+    * Optionally use `--dashboard.assets=<path>` to set the assets' path (e.g. `--dashboard.assets=".../go-ethereum/dashboard/assets/public"`). 
+Using this flag it is enough to only bundle the resources with webpack and refresh the page.
+There is no need for stopping the server and regenerating the `assets.go` on every change of the UI.
+1. Enter `localhost:8080` (or change the configuration).
+
+#### Tools
+[Webpack][Webpack] offers great tools for visualizing the bundle's dependency tree and space usage.
+
+* Generate the bundle's profile by running `webpack --profile --json > stats.json`
+* For the _dependency tree_ go to [Webpack Analyze][WA], and import `stats.json`
+* For the _space usage_ go to [Webpack Visualizer][WV], and import `stats.json`
+
+[React]: https://reactjs.org/
+[ESLint]: https://eslint.org/
+[Airbnb]: https://github.com/airbnb/javascript/tree/master/react
+[Webpack]: https://webpack.github.io/
+[WA]: http://webpack.github.io/analyse/
+[WV]: http://chrisbateman.github.io/webpack-visualizer/
+[Node.js]: https://nodejs.org/en/

dashboard/assets/.eslintrc

@@ -0,0 +1,31 @@
+// React syntax style mostly according to https://github.com/airbnb/javascript/tree/master/react
+{
+  "plugins": [
+    "react"
+  ],
+  "parser": "babel-eslint",
+  "parserOptions": {
+    "ecmaFeatures": {
+      "jsx": true,
+      "modules": true
+    }
+  },
+  "rules": {
+    "react/prefer-es6-class": 2,
+    "react/prefer-stateless-function": 2,
+    "react/jsx-pascal-case": 2,
+    "react/jsx-closing-bracket-location": [1, {"selfClosing": "tag-aligned", "nonEmpty": "tag-aligned"}],
+    "react/jsx-closing-tag-location": 1,
+    "jsx-quotes": ["error", "prefer-double"],
+    "no-multi-spaces": "error",
+    "react/jsx-tag-spacing": 2,
+    "react/jsx-curly-spacing": [2, {"when": "never", "children": true}],
+    "react/jsx-boolean-value": 2,
+    "react/no-string-refs": 2,
+    "react/jsx-wrap-multilines": 2,
+    "react/self-closing-comp": 2,
+    "react/jsx-no-bind": 2,
+    "react/require-render-return": 2,
+    "react/no-is-mounted": 2
+  }
+}

dashboard/assets/components/Common.jsx

@@ -0,0 +1,29 @@
+// isNullOrUndefined returns true if the given variable is null or undefined.
+export const isNullOrUndefined = variable => variable === null || typeof variable === 'undefined';
+
+// defaultZero returns 0 if the given element is null or undefined, otherwise returns the given element.
+export const defaultZero = elem => isNullOrUndefined(elem) ? 0 : elem;
+
+export const MEMORY_SAMPLE_LIMIT = 200; // Maximum number of memory data samples.
+export const TRAFFIC_SAMPLE_LIMIT = 200; // Maximum number of traffic data samples.
+
+// The sidebar menu and the main content are rendered based on these elements.
+export const TAGS = (() => {
+    const T = {
+        home: { title: "Home", },
+        logs: { title: "Logs", },
+        networking: { title: "Networking", },
+        txpool: { title: "Txpool", },
+        blockchain: { title: "Blockchain", },
+        system: { title: "System", },
+    };
+    // Using the key is circumstantial in some cases, so it is better to insert it also as a value.
+    // This way the mistyping is prevented.
+    for(let key in T) {
+        T[key]['id'] = key;
+    }
+    return T;
+})();
+
+// Temporary - taken from Material-UI
+export const DRAWER_WIDTH = 240;

dashboard/assets/components/Dashboard.jsx

@@ -0,0 +1,146 @@
+import React, {Component} from 'react';
+import PropTypes from 'prop-types';
+import {withStyles} from 'material-ui/styles';
+
+import SideBar from './SideBar.jsx';
+import Header from './Header.jsx';
+import Main from "./Main.jsx";
+import {isNullOrUndefined, defaultZero, MEMORY_SAMPLE_LIMIT, TAGS} from "./Common.jsx";
+
+// Styles for the Dashboard component.
+const styles = theme => ({
+    appFrame: {
+        position: 'relative',
+        display: 'flex',
+        width: '100%',
+        height: '100%',
+        background: '#303030',
+    },
+});
+
+// Dashboard is the main component, which renders the whole page,
+// makes connection with the server and listens for messages.
+// When there is an incoming message, updates the page's content correspondingly.
+class Dashboard extends Component {
+    constructor(props) {
+        super(props);
+        this.state = {
+            active: TAGS.home.id, // active menu
+            sideBar: true, // true if the sidebar is opened
+            memory: [],
+            traffic: [],
+            logs: [],
+        };
+    }
+
+    // componentDidMount initiates the establishment of the first websocket connection after the component is rendered.
+    componentDidMount() {
+        this.reconnect();
+    }
+
+    // reconnect establishes a websocket connection with the server, listens for incoming messages
+    // and tries to reconnect on connection loss.
+    reconnect = () => {
+        const server = new WebSocket("ws://" + location.host + "/api");
+
+        server.onmessage = event => {
+            const msg = JSON.parse(event.data);
+            if (isNullOrUndefined(msg)) {
+                return;
+            }
+            this.update(msg);
+        };
+
+        server.onclose = () => {
+            setTimeout(this.reconnect, 3000);
+        };
+    };
+
+    // update analyzes the incoming message, and updates the charts' content correspondingly.
+    update = msg => {
+        // (Re)initialize the state with the past data. metrics is set only in the first msg,
+        // after the connection is established.
+        if (!isNullOrUndefined(msg.metrics)) {
+            let memory = [];
+            let traffic = [];
+            if (!isNullOrUndefined(msg.metrics.memory)) {
+                memory = msg.metrics.memory.map(elem => ({memory: elem.value}));
+                traffic = msg.metrics.processor.map(elem => ({traffic: defaultZero(elem.value)})) // TODO (kurkomisi): traffic != processor!!!
+            }
+            this.setState({
+                memory: memory,
+                traffic: traffic,
+                logs: [],
+            });
+        }
+
+        // Insert the new data samples.
+        isNullOrUndefined(msg.memory) || this.setState(prevState => {
+            let memory = prevState.memory;
+            let traffic = prevState.traffic;
+            // Remove the first elements in case the samples' amount exceeds the limit.
+            if (memory.length === MEMORY_SAMPLE_LIMIT) {
+                memory.shift();
+                traffic.shift();
+            }
+            return ({
+                memory: [...memory, {memory: msg.memory.value}],
+                traffic: [...traffic, {traffic: defaultZero(msg.processor.value)}],
+            });
+        });
+
+        // Insert the new log.
+        isNullOrUndefined(msg.log) || this.setState(prevState => {
+            let logs = prevState.logs;
+            if(logs.length > 20) {
+                logs.shift();
+            }
+            return {logs: [...logs, msg.log]};
+        });
+    };
+
+    // The change of the active label on the SideBar component will trigger a new render in the Main component.
+    changeContent = active => {
+        this.state.active === active || this.setState({active: active});
+    };
+
+    openSideBar = () => {
+        this.setState({sideBar: true});
+    };
+
+    closeSideBar = () => {
+        this.setState({sideBar: false});
+    };
+
+    render() {
+        // The classes property is injected by withStyles().
+        const {classes} = this.props;
+
+        return (
+            <div className={classes.appFrame}>
+                <Header
+                    opened={this.state.sideBar}
+                    open={this.openSideBar}
+                />
+                <SideBar
+                    opened={this.state.sideBar}
+                    close={this.closeSideBar}
+                    changeContent={this.changeContent}
+                />
+                <Main
+                    opened={this.state.sideBar}
+                    active={this.state.active}
+                    memory={this.state.memory}
+                    traffic={this.state.traffic}
+                    logs={this.state.logs}
+                />
+            </div>
+        );
+    }
+}
+
+Dashboard.propTypes = {
+    classes: PropTypes.object.isRequired,
+};
+
+export default withStyles(styles)(Dashboard);

dashboard/assets/components/Header.jsx

@@ -0,0 +1,71 @@
+import React, {Component} from 'react';
+import PropTypes from 'prop-types';
+import classNames from 'classnames';
+import {withStyles} from 'material-ui/styles';
+import AppBar from 'material-ui/AppBar';
+import Toolbar from 'material-ui/Toolbar';
+import Typography from 'material-ui/Typography';
+import IconButton from 'material-ui/IconButton';
+import MenuIcon from 'material-ui-icons/Menu';
+
+import {DRAWER_WIDTH} from './Common.jsx';
+
+// Styles for the Header component.
+const styles = theme => ({
+    appBar: {
+        position: 'absolute',
+        transition: theme.transitions.create(['margin', 'width'], {
+            easing: theme.transitions.easing.sharp,
+            duration: theme.transitions.duration.leavingScreen,
+        }),
+    },
+    appBarShift: {
+        marginLeft: DRAWER_WIDTH,
+        width: `calc(100% - ${DRAWER_WIDTH}px)`,
+        transition: theme.transitions.create(['margin', 'width'], {
+            easing: theme.transitions.easing.easeOut,
+            duration: theme.transitions.duration.enteringScreen,
+        }),
+    },
+    menuButton: {
+        marginLeft: 12,
+        marginRight: 20,
+    },
+    hide: {
+        display: 'none',
+    },
+});
+
+// Header renders a header, which contains a sidebar opener icon when that is closed.
+class Header extends Component {
+    render() {
+        // The classes property is injected by withStyles().
+        const {classes} = this.props;
+
+        return (
+            <AppBar className={classNames(classes.appBar, this.props.opened && classes.appBarShift)}>
+                <Toolbar disableGutters={!this.props.opened}>
+                    <IconButton
+                        color="contrast"
+                        aria-label="open drawer"
+                        onClick={this.props.open}
+                        className={classNames(classes.menuButton, this.props.opened && classes.hide)}
+                    >
+                        <MenuIcon />
+                    </IconButton>
+                    <Typography type="title" color="inherit" noWrap>
+                        Go Ethereum Dashboard
+                    </Typography>
+                </Toolbar>
+            </AppBar>
+        );
+    }
+}
+
+Header.propTypes = {
+    classes: PropTypes.object.isRequired,
+    opened: PropTypes.bool.isRequired,
+    open: PropTypes.func.isRequired,
+};
+
+export default withStyles(styles)(Header);

dashboard/assets/components/Main.jsx

@@ -0,0 +1,158 @@
+import React, {Component} from 'react';
+import PropTypes from 'prop-types';
+import classNames from 'classnames';
+import {withStyles} from 'material-ui/styles';
+import Grid from 'material-ui/Grid';
+import {LineChart, AreaChart, Area, YAxis, CartesianGrid, Line, ResponsiveContainer} from 'recharts';
+
+import {TAGS, DRAWER_WIDTH} from "./Common.jsx";
+
+// ChartGrid renders a grid container for responsive charts.
+// The children are Recharts components extended with the Material-UI's xs property.
+class ChartGrid extends Component {
+    render() {
+        return (
+            <Grid container spacing={this.props.spacing}>
+                {
+                    React.Children.map(this.props.children, child => (
+                        <Grid item xs={child.props.xs}>
+                            <ResponsiveContainer width="100%" height={child.props.height}>
+                                {child}
+                            </ResponsiveContainer>
+                        </Grid>
+                    ))
+                }
+            </Grid>
+        );
+    }
+}
+
+ChartGrid.propTypes = {
+    spacing: PropTypes.number.isRequired,
+};
+
+// ContentSwitch chooses and renders the proper page content.
+class ContentSwitch extends Component {
+    render() {
+        switch(this.props.active) {
+            case TAGS.home.id:
+                return (
+                    <ChartGrid spacing={24}>
+                        <AreaChart xs={6} height={300} data={this.props.memory}>
+                            <YAxis />
+                            <Area type="monotone" dataKey="memory" stroke="#8884d8" fill="#8884d8" />
+                        </AreaChart>
+                        <LineChart xs={6} height={300} data={this.props.traffic}>
+                            <Line type="monotone" dataKey="traffic" dot={false} />
+                        </LineChart>
+                        <LineChart xs={6} height={300} data={this.props.memory}>
+                            <YAxis />
+                            <CartesianGrid stroke="#eee" strokeDasharray="5 5" />
+                            <Line type="monotone" dataKey="memory" stroke="#8884d8" dot={false} />
+                        </LineChart>
+                        <AreaChart xs={6} height={300} data={this.props.traffic}>
+                            <CartesianGrid stroke="#eee" strokeDasharray="5 5" vertical={false} />
+                            <Area type="monotone" dataKey="traffic" />
+                        </AreaChart>
+                    </ChartGrid>
+                );
+            case TAGS.logs.id:
+                return <div>{this.props.logs.map((log, index) => <div key={index}>{log}</div>)}</div>;
+            case TAGS.networking.id:
+                // Only for testing.
+                return (
+                    <Grid container spacing={24}>
+                        <Grid item xs={6}>
+                            <ResponsiveContainer width="100%" height={300}>
+                                <LineChart data={this.props.traffic}>
+                                    <Line type="monotone" dataKey="traffic" dot={false} />
+                                </LineChart>
+                            </ResponsiveContainer>
+                        </Grid>
+                        <Grid item xs={6}>
+                            <ResponsiveContainer width="100%" height={300}>
+                                <AreaChart data={this.props.memory}>
+                                    <YAxis />
+                                    <Area type="monotone" dataKey="memory" stroke="#8884d8" fill="#8884d8" />
+                                </AreaChart>
+                            </ResponsiveContainer>
+                        </Grid>
+                        <Grid item xs={6}>
+                            <ResponsiveContainer width="100%" height={300}>
+                                <AreaChart data={this.props.traffic}>
+                                    <CartesianGrid stroke="#eee" strokeDasharray="5 5" vertical={false} />
+                                    <Area type="monotone" dataKey="traffic" />
+                                </AreaChart>
+                            </ResponsiveContainer>
+                        </Grid>
+                    </Grid>
+
+                );
+            case TAGS.txpool.id:
+            case TAGS.blockchain.id:
+            case TAGS.system.id:
+        }
+        return null;
+    }
+}
+
+ContentSwitch.propTypes = {
+    active: PropTypes.string.isRequired,
+};
+
+// Styles for the Main component.
+const styles = theme => ({
+    content: {
+        width: '100%',
+        marginLeft: -DRAWER_WIDTH,
+        flexGrow: 1,
+        backgroundColor: theme.palette.background.default,
+        padding: theme.spacing.unit * 3,
+        transition: theme.transitions.create('margin', {
+            easing: theme.transitions.easing.sharp,
+            duration: theme.transitions.duration.leavingScreen,
+        }),
+        marginTop: 56,
+        overflow: 'auto',
+        [theme.breakpoints.up('sm')]: {
+            content: {
+                height: 'calc(100% - 64px)',
+                marginTop: 64,
+            },
+        },
+    },
+    contentShift: {
+        marginLeft: 0,
+        transition: theme.transitions.create('margin', {
+            easing: theme.transitions.easing.easeOut,
+            duration: theme.transitions.duration.enteringScreen,
+        }),
+    },
+});
+
+// Main renders a component for the page content.
+class Main extends Component {
+    render() {
+        // The classes property is injected by withStyles().
+        const {classes} = this.props;
+
+        return (
+            <main className={classNames(classes.content, this.props.opened && classes.contentShift)}>
+                <ContentSwitch
+                    active={this.props.active}
+                    memory={this.props.memory}
+                    traffic={this.props.traffic}
+                    logs={this.props.logs}
+                />
+            </main>
+        );
+    }
+}
+
+Main.propTypes = {
+    classes: PropTypes.object.isRequired,
+    opened: PropTypes.bool.isRequired,
+    active: PropTypes.string.isRequired,
+};
+
+export default withStyles(styles)(Main);

dashboard/assets/components/SideBar.jsx

@@ -0,0 +1,89 @@
+import React, {Component} from 'react';
+import PropTypes from 'prop-types';
+import {withStyles} from 'material-ui/styles';
+import Drawer from 'material-ui/Drawer';
+import {IconButton} from "material-ui";
+import List, {ListItem, ListItemText} from 'material-ui/List';
+import ChevronLeftIcon from 'material-ui-icons/ChevronLeft';
+
+import {TAGS, DRAWER_WIDTH} from './Common.jsx';
+
+// Styles for the SideBar component.
+const styles = theme => ({
+    drawerPaper: {
+        position: 'relative',
+        height: '100%',
+        width: DRAWER_WIDTH,
+    },
+    drawerHeader: {
+        display: 'flex',
+        alignItems: 'center',
+        justifyContent: 'flex-end',
+        padding: '0 8px',
+        ...theme.mixins.toolbar,
+        transitionDuration: {
+            enter: theme.transitions.duration.enteringScreen,
+            exit: theme.transitions.duration.leavingScreen,
+        }
+    },
+});
+
+// SideBar renders a sidebar component.
+class SideBar extends Component {
+    constructor(props) {
+        super(props);
+
+        // clickOn contains onClick event functions for the menu items.
+        // Instantiate only once, and reuse the existing functions to prevent the creation of
+        // new function instances every time the render method is triggered.
+        this.clickOn = {};
+        for(let key in TAGS) {
+            const id = TAGS[key].id;
+            this.clickOn[id] = e => {
+                e.preventDefault();
+                this.props.changeContent(id);
+            };
+        }
+    }
+
+    render() {
+        // The classes property is injected by withStyles().
+        const {classes} = this.props;
+
+        return (
+            <Drawer
+                type="persistent"
+                classes={{paper: classes.drawerPaper,}}
+                open={this.props.opened}
+            >
+                <div>
+                    <div className={classes.drawerHeader}>
+                        <IconButton onClick={this.props.close}>
+                            <ChevronLeftIcon />
+                        </IconButton>
+                    </div>
+                    <List>
+                        {
+                            Object.values(TAGS).map(tag => {
+                                return (
+                                    <ListItem button key={tag.id} onClick={this.clickOn[tag.id]}>
+                                        <ListItemText primary={tag.title} />
+                                    </ListItem>
+                                )
+                            })
+                        }
+                    </List>
+                </div>
+            </Drawer>
+        );
+    }
+}
+
+SideBar.propTypes = {
+    classes: PropTypes.object.isRequired,
+    opened: PropTypes.bool.isRequired,
+    close: PropTypes.func.isRequired,
+    changeContent: PropTypes.func.isRequired,
+};
+
+export default withStyles(styles)(SideBar);

dashboard/assets/index.jsx

@@ -0,0 +1,20 @@
+import React from 'react';
+import {hydrate} from 'react-dom';
+import {createMuiTheme, MuiThemeProvider} from 'material-ui/styles';
+
+import Dashboard from './components/Dashboard.jsx';
+
+// Theme for the dashboard.
+const theme = createMuiTheme({
+    palette: {
+        type: 'dark',
+    },
+});
+
+// Renders the whole dashboard.
+hydrate(
+    <MuiThemeProvider theme={theme}>
+        <Dashboard />
+    </MuiThemeProvider>,
+    document.getElementById('dashboard')
+); // server-side rendering

dashboard/assets/package.json

@@ -0,0 +1,22 @@
+{
+  "dependencies": {
+    "babel-core": "^6.26.0",
+    "babel-eslint": "^8.0.1",
+    "babel-loader": "^7.1.2",
+    "babel-preset-env": "^1.6.1",
+    "babel-preset-react": "^6.24.1",
+    "babel-preset-stage-0": "^6.24.1",
+    "classnames": "^2.2.5",
+    "eslint": "^4.5.0",
+    "eslint-plugin-react": "^7.4.0",
+    "material-ui": "^1.0.0-beta.18",
+    "material-ui-icons": "^1.0.0-beta.17",
+    "path": "^0.12.7",
+    "prop-types": "^15.6.0",
+    "recharts": "^1.0.0-beta.0",
+    "react": "^16.0.0",
+    "react-dom": "^16.0.0",
+    "url": "^0.11.0",
+    "webpack": "^3.5.5"
+  }
+}

dashboard/assets/public/dashboard.html

@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en" style="height: 100%">
+    <head>
+        <meta charset="UTF-8">
+        <meta http-equiv="X-UA-Compatible" content="IE=edge">
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+
+        <title>Go Ethereum Dashboard</title>
+        <link rel="shortcut icon" type="image/ico" href="https://ethereum.org/favicon.ico"/>
+
+        <!-- TODO (kurkomisi): Return to the external libraries to speed up the bundling during development -->
+    </head>
+    <body style="height: 100%; margin: 0">
+        <div id="dashboard" style="height: 100%"></div>
+        <script src="bundle.js"></script>
+    </body>
+</html>

dashboard/assets/webpack.config.js

@@ -0,0 +1,20 @@
+const path = require('path');
+
+module.exports = {
+    entry:  './index.jsx',
+    output: {
+        path:     path.resolve(__dirname, 'public'),
+        filename: 'bundle.js',
+    },
+    module: {
+        loaders: [
+            {
+                test: /\.jsx$/, // regexp for JSX files
+                loader: 'babel-loader', // The babel configuration is in the package.json.
+                query: {
+                    presets: ['env', 'react', 'stage-0']
+                }
+            },
+        ],
+    },
+};

dashboard/config.go

@@ -0,0 +1,45 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package dashboard
+
+import "time"
+
+// DefaultConfig contains default settings for the dashboard.
+var DefaultConfig = Config{
+	Host:    "localhost",
+	Port:    8080,
+	Refresh: 3 * time.Second,
+}
+
+// Config contains the configuration parameters of the dashboard.
+type Config struct {
+	// Host is the host interface on which to start the dashboard server. If this
+	// field is empty, no dashboard will be started.
+	Host string `toml:",omitempty"`
+
+	// Port is the TCP port number on which to start the dashboard server. The
+	// default zero value is/ valid and will pick a port number randomly (useful
+	// for ephemeral nodes).
+	Port int `toml:",omitempty"`
+
+	// Refresh is the refresh rate of the data updates, the data will be collected this often.
+	Refresh time.Duration `toml:",omitempty"`
+
+	// Assets offers a possibility to manually set the dashboard website's location on the server side.
+	// It is useful for debugging, avoids the repeated generation of the binary.
+	Assets  string `toml:",omitempty"`
+}

dashboard/dashboard.go

@@ -0,0 +1,314 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package dashboard
+
+//go:generate go-bindata -nometadata -o assets.go -prefix assets -pkg dashboard assets/public/...
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/rpc"
+	"github.com/rcrowley/go-metrics"
+	"golang.org/x/net/websocket"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+const (
+	processorSampleLimit = 200
+	memorySampleLimit    = 200
+	trafficSampleLimit   = 200
+)
+
+var (
+	nextId uint32 // Next connection id
+)
+
+type dashboard struct {
+	config *Config
+
+	listener net.Listener
+	conns    map[uint32]*client // Currently live websocket connections
+	Metrics  *metricSamples     `json:"metrics,omitempty"`
+	Stats    *status            `json:"stats,omitempty"`
+	lock     sync.RWMutex       // Lock protecting the dashboard's internals
+
+	closing chan chan error // Channel used for graceful exit
+	wg      sync.WaitGroup
+}
+
+type client struct {
+	conn   *websocket.Conn              // Particular live websocket connection
+	msg    chan *map[string]interface{} // Message queue for the update messages
+	logger log.Logger                   // Logger for the particular live websocket connection
+}
+
+type metricSamples struct {
+	Processor []*data `json:"processor,omitempty"`
+	Memory    []*data `json:"memory,omitempty"`
+}
+
+type data struct {
+	Time  time.Time `json:"time,omitempty"`
+	Value float64   `json:"value,omitempty"`
+}
+
+type status struct {
+	Peers int `json:"peers,omitempty"`
+	Block int `json:"block,omitempty"`
+}
+
+// New creates a new dashboard instance with the given configuration.
+func New(config *Config) (*dashboard, error) {
+	return &dashboard{
+		conns:   make(map[uint32]*client),
+		config:  config,
+		Metrics: &metricSamples{},
+		closing: make(chan chan error),
+	}, nil
+}
+
+// Protocols is a meaningless implementation of node.Service.
+func (db *dashboard) Protocols() []p2p.Protocol { return nil }
+
+// APIs is a meaningless implementation of node.Service.
+func (db *dashboard) APIs() []rpc.API { return nil }
+
+// Start implements node.Service, starting the data collection thread and the listening server of the dashboard.
+func (db *dashboard) Start(server *p2p.Server) error {
+	db.wg.Add(2)
+	go db.collectData()
+	go db.collectLogs() // In case of removing this line change 2 back to 1 in wg.Add.
+
+	http.HandleFunc("/", db.webHandler)
+	http.Handle("/api", websocket.Handler(db.apiHandler))
+
+	listener, err := net.Listen("tcp", fmt.Sprintf("%s:%d", db.config.Host, db.config.Port))
+	if err != nil {
+		return err
+	}
+	db.listener = listener
+
+	go http.Serve(listener, nil)
+
+	return nil
+}
+
+// Stop implements node.Service, stopping the data collection thread and the connection listener of the dashboard.
+func (db *dashboard) Stop() error {
+	var err error
+	// Close the connection listener
+	if err = db.listener.Close(); err != nil {
+		log.Warn("Failed to close listener", "err", err)
+	}
+
+	errc := make(chan error)
+	db.closing <- errc // collectData
+	<-errc
+	db.closing <- errc // collectLogs
+	<-errc
+
+	db.lock.Lock()
+	for _, c := range db.conns {
+		if err := c.conn.Close(); err != nil {
+			c.logger.Warn("Failed to close connection", "err", err)
+		}
+	}
+	db.lock.Unlock()
+
+	db.wg.Wait()
+	log.Info("Dashboard stopped")
+
+	return err
+}
+
+func join(strings ...string) *bytes.Buffer {
+	var buffer bytes.Buffer
+	for _, s := range strings {
+		buffer.WriteString(s)
+	}
+	return &buffer
+}
+
+// webHandler handles all non-api requests, simply flattening and returning the dashboard website.
+func (db *dashboard) webHandler(w http.ResponseWriter, r *http.Request) {
+	log.Info("Request", "URL", r.URL)
+
+	path := r.URL.String()
+	if path == "/" {
+		path = "/dashboard.html"
+	}
+
+	// If the path of the assets is manually set
+	if db.config.Assets != "" {
+		file, err := ioutil.ReadFile(join(db.config.Assets, path).String())
+		if err != nil {
+			log.Warn("Failed to read file", "err", err)
+			http.Error(w, "not found", http.StatusNotFound)
+			return
+		}
+		w.Write(file)
+		return
+	}
+
+	webapp, err := Asset(join("public", path).String())
+	if err != nil {
+		log.Warn("Failed to load the asset", "path", path, "err", err)
+		http.Error(w, "not found", http.StatusNotFound)
+		return
+	}
+	w.Write(webapp)
+}
+
+// apiHandler handles requests for the dashboard.
+func (db *dashboard) apiHandler(conn *websocket.Conn) {
+	id := atomic.AddUint32(&nextId, 1)
+	client := &client{
+		conn:   conn,
+		msg:    make(chan *map[string]interface{}, 128),
+		logger: log.New("id", id),
+	}
+
+	loss := make(chan bool, 1) // Buffered channel as sender may exit early
+
+	// Start listening for messages to send.
+	db.wg.Add(1)
+	go func() {
+		defer db.wg.Done()
+
+		for {
+			select {
+			case <-loss:
+				return
+			case msg := <-client.msg:
+				if err := websocket.JSON.Send(client.conn, msg); err != nil {
+					client.logger.Warn("Failed to send the message", "msg", msg, "err", err)
+					return
+				}
+			}
+		}
+	}()
+
+	// Send the past data.
+	client.msg <- &map[string]interface{}{
+		"metrics": db.Metrics,
+	}
+
+	// Start tracking the connection and drop at connection loss.
+	db.lock.Lock()
+	db.conns[id] = client
+	db.lock.Unlock()
+	defer func() {
+		db.lock.Lock()
+		delete(db.conns, id)
+		db.lock.Unlock()
+	}()
+
+	for {
+		fail := []byte{}
+		if _, err := conn.Read(fail); err != nil {
+			loss <- true
+			return
+		}
+		// Ignore all messages
+	}
+}
+
+// collectData collects the required data to plot on the dashboard.
+func (db *dashboard) collectData() {
+	defer db.wg.Done()
+
+	for {
+		select {
+		case errc := <-db.closing:
+			errc <- nil
+			return
+		case <-time.After(db.config.Refresh):
+			now := time.Now()
+			traffic := metrics.DefaultRegistry.Get("p2p/InboundTraffic").(metrics.Meter).Rate1()
+			memoryInUse := metrics.DefaultRegistry.Get("system/memory/inuse").(metrics.Meter).Rate1()
+			traff := &data{
+				Time:  now,
+				Value: traffic,
+			}
+			memory := &data{
+				Time:  now,
+				Value: memoryInUse,
+			}
+
+			// TODO (kurkomisi): do not mix traffic with processor!
+			db.update(traff, memory)
+		}
+	}
+}
+
+// collectLogs collects and sends the logs to the active dashboards.
+func (db *dashboard) collectLogs() {
+	defer db.wg.Done()
+
+	// TODO (kurkomisi): log collection comes here.
+	for {
+		select {
+		case errc := <-db.closing:
+			errc <- nil
+			return
+		case <-time.After(db.config.Refresh):
+			db.sendToAll(&map[string]interface{}{
+				"log": "This is a fake log.",
+			})
+		}
+	}
+}
+
+// update updates the dashboards through the live websocket connections.
+func (db *dashboard) update(processor *data, memory *data) {
+	// Remove the first elements in case the samples' amount exceeds the limit.
+	first := 0
+	if len(db.Metrics.Processor) == processorSampleLimit {
+		first = 1
+	}
+	db.Metrics.Processor = append(db.Metrics.Processor[first:], processor)
+	first = 0
+	if len(db.Metrics.Memory) == memorySampleLimit {
+		first = 1
+	}
+	db.Metrics.Memory = append(db.Metrics.Memory[first:], memory)
+
+	db.sendToAll(&map[string]interface{}{
+		"processor": processor,
+		"memory":    memory,
+	})
+}
+
+// Sends the given message to the active dashboards.
+func (db *dashboard) sendToAll(msg *map[string]interface{}) {
+	db.lock.Lock()
+	for _, c := range db.conns {
+		select {
+		case c.msg <- msg:
+		default:
+			c.logger.Warn("Client message queue is full")
+		}
+	}
+	db.lock.Unlock()
+}