From a125b6756a0803a692051d859f54b98be76e3e67 Mon Sep 17 00:00:00 2001
From: Julius Volz <julius.volz@gmail.com>
Date: Fri, 1 Feb 2019 21:32:45 +0000
Subject: [PATCH] Initial Prometheus expression browser code

Signed-off-by: Julius Volz <julius.volz@gmail.com>
---
 src/App.css          |  32 --------
 src/App.js           | 177 ++++++++++++++++++++++++++++++++++++++-----
 src/index.css        |  14 ----
 src/index.js         |   7 --
 src/logo.svg         |   7 --
 src/serviceWorker.js | 135 ---------------------------------
 6 files changed, 160 insertions(+), 212 deletions(-)
 delete mode 100755 src/App.css
 delete mode 100755 src/index.css
 delete mode 100755 src/logo.svg
 delete mode 100755 src/serviceWorker.js

diff --git a/src/App.css b/src/App.css
deleted file mode 100755
index 92f956e804..0000000000
--- a/src/App.css
+++ /dev/null
@@ -1,32 +0,0 @@
-.App {
-  text-align: center;
-}
-
-.App-logo {
-  animation: App-logo-spin infinite 20s linear;
-  height: 40vmin;
-}
-
-.App-header {
-  background-color: #282c34;
-  min-height: 100vh;
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  font-size: calc(10px + 2vmin);
-  color: white;
-}
-
-.App-link {
-  color: #61dafb;
-}
-
-@keyframes App-logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
-}
diff --git a/src/App.js b/src/App.js
index 7e261ca47e..9c723ac188 100755
--- a/src/App.js
+++ b/src/App.js
@@ -1,28 +1,171 @@
 import React, { Component } from 'react';
-import logo from './logo.svg';
-import './App.css';
 
 class App extends Component {
   render() {
     return (
-      <div className="App">
-        <header className="App-header">
-          <img src={logo} className="App-logo" alt="logo" />
-          <p>
-            Edit <code>src/App.js</code> and save to reload.
-          </p>
-          <a
-            className="App-link"
-            href="https://reactjs.org"
-            target="_blank"
-            rel="noopener noreferrer"
-          >
-            Learn React
-          </a>
-        </header>
+      <PanelList />
+    );
+  }
+}
+
+class PanelList extends Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      panels: [],
+    };
+    this.key = 0;
+
+    this.addPanel = this.addPanel.bind(this);
+    this.removePanel = this.removePanel.bind(this);
+  }
+
+  componentDidMount() {
+    this.addPanel();
+  }
+
+  getKey() {
+    return (this.key++).toString();
+  }
+
+  addPanel() {
+    const panels = this.state.panels.slice();
+    const key = this.getKey();
+    panels.push(<Panel key={key} removePanel={() => this.removePanel(key)}/>);
+    this.setState({panels: panels});
+  }
+
+  removePanel(key) {
+    const panels = this.state.panels.filter(panel => {
+      return panel.key !== key;
+    });
+    this.setState({panels: panels});
+  }
+
+  render() {
+    return (
+      <>
+        {this.state.panels}
+        <button onClick={this.addPanel}>+</button>
+      </>
+    );
+  }
+}
+
+class Panel extends Component {
+  constructor(props) {
+    super(props);
+
+    this.state = {
+      expr: '',
+      type: 'graph', // TODO enum?
+      range: '1h',
+      endTime: null,
+      data: null,
+      loading: false,
+      error: null,
+      stats: null,
+    };
+
+    this.execute = this.execute.bind(this);
+    this.handleExpressionChange = this.handleExpressionChange.bind(this);
+  }
+
+  execute() {
+    this.setState({loading: true});
+
+    fetch('http://demo.robustperception.io:9090/api/v1/query?query=' + encodeURIComponent(this.state.expr))
+    .then(resp => {
+      if (resp.ok) {
+        return resp.json();
+      } else {
+        console.log(resp);
+        throw new Error('Unexpected response status: ' + resp.statusText);
+      }
+    })
+    .then(json => 
+      this.setState({
+        data: json.data,
+        loading: false,
+      })
+    )
+    .catch(error => {
+      this.setState({
+        error,
+        loading: false
+      })
+    });
+  }
+
+  handleExpressionChange(event) {
+    this.setState({expr: event.target.value});
+  }
+
+  render() {
+    return (
+      <div>
+        <ExpressionInput value={this.state.expr} onChange={this.handleExpressionChange} execute={this.execute}/>
+        {this.state.loading && "Loading..."}
+        {this.state.error}
+        <DataTable data={this.state.data} />
+        <button onClick={this.props.removePanel}>-</button>
       </div>
     );
   }
 }
 
+class ExpressionInput extends Component {
+  constructor(props) {
+    super(props);
+
+    this.handleKeyPress = this.handleKeyPress.bind(this);
+  }
+
+  handleKeyPress(event) {
+    if (event.key === 'Enter' && !event.shiftKey) {
+      this.props.execute();
+      event.preventDefault();
+    }
+  }
+
+  render() {
+    return (
+      <div>
+        <textarea
+          value={this.props.value}
+          onChange={this.props.onChange}
+          onKeyPress={this.handleKeyPress}
+          placeholder="Expression (press Shift+Enter for newlines)" />
+        <button onClick={this.props.execute}>Execute</button>
+      </div>
+    );
+  }
+}
+
+function DataTable(props) {
+  if (!props.data) {
+    return <div>no data</div>;
+  }
+  const rows = props.data.result.map((s, index) => {
+    return <tr key={index}><th>{metricToSeriesName(s.metric)}</th><td>{s.value[1]} @ {s.value[0]}</td></tr>
+  });
+  return (
+    <table>
+      <tbody>{rows}</tbody>
+    </table>
+  );
+}
+
+function metricToSeriesName(labels) {
+  var tsName = (labels.__name__ || '') + "{";
+  var labelStrings = [];
+   for (var label in labels) {
+     if (label !== "__name__") {
+       labelStrings.push(label + "=\"" + labels[label] + "\"");
+     }
+   }
+  tsName += labelStrings.join(",") + "}";
+  return tsName;
+};
+
 export default App;
diff --git a/src/index.css b/src/index.css
deleted file mode 100755
index cee5f348fb..0000000000
--- a/src/index.css
+++ /dev/null
@@ -1,14 +0,0 @@
-body {
-  margin: 0;
-  padding: 0;
-  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
-    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-code {
-  font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
-    monospace;
-}
diff --git a/src/index.js b/src/index.js
index 0c5e75da1c..b597a44232 100755
--- a/src/index.js
+++ b/src/index.js
@@ -1,12 +1,5 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
-import './index.css';
 import App from './App';
-import * as serviceWorker from './serviceWorker';
 
 ReactDOM.render(<App />, document.getElementById('root'));
-
-// If you want your app to work offline and load faster, you can change
-// unregister() to register() below. Note this comes with some pitfalls.
-// Learn more about service workers: http://bit.ly/CRA-PWA
-serviceWorker.unregister();
diff --git a/src/logo.svg b/src/logo.svg
deleted file mode 100755
index 6b60c1042f..0000000000
--- a/src/logo.svg
+++ /dev/null
@@ -1,7 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
-    <g fill="#61DAFB">
-        <path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/>
-        <circle cx="420.9" cy="296.5" r="45.7"/>
-        <path d="M520.5 78.1z"/>
-    </g>
-</svg>
diff --git a/src/serviceWorker.js b/src/serviceWorker.js
deleted file mode 100755
index 2283ff9ced..0000000000
--- a/src/serviceWorker.js
+++ /dev/null
@@ -1,135 +0,0 @@
-// This optional code is used to register a service worker.
-// register() is not called by default.
-
-// This lets the app load faster on subsequent visits in production, and gives
-// it offline capabilities. However, it also means that developers (and users)
-// will only see deployed updates on subsequent visits to a page, after all the
-// existing tabs open on the page have been closed, since previously cached
-// resources are updated in the background.
-
-// To learn more about the benefits of this model and instructions on how to
-// opt-in, read http://bit.ly/CRA-PWA
-
-const isLocalhost = Boolean(
-  window.location.hostname === 'localhost' ||
-    // [::1] is the IPv6 localhost address.
-    window.location.hostname === '[::1]' ||
-    // 127.0.0.1/8 is considered localhost for IPv4.
-    window.location.hostname.match(
-      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
-    )
-);
-
-export function register(config) {
-  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
-    // The URL constructor is available in all browsers that support SW.
-    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
-    if (publicUrl.origin !== window.location.origin) {
-      // Our service worker won't work if PUBLIC_URL is on a different origin
-      // from what our page is served on. This might happen if a CDN is used to
-      // serve assets; see https://github.com/facebook/create-react-app/issues/2374
-      return;
-    }
-
-    window.addEventListener('load', () => {
-      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
-
-      if (isLocalhost) {
-        // This is running on localhost. Let's check if a service worker still exists or not.
-        checkValidServiceWorker(swUrl, config);
-
-        // Add some additional logging to localhost, pointing developers to the
-        // service worker/PWA documentation.
-        navigator.serviceWorker.ready.then(() => {
-          console.log(
-            'This web app is being served cache-first by a service ' +
-              'worker. To learn more, visit http://bit.ly/CRA-PWA'
-          );
-        });
-      } else {
-        // Is not localhost. Just register service worker
-        registerValidSW(swUrl, config);
-      }
-    });
-  }
-}
-
-function registerValidSW(swUrl, config) {
-  navigator.serviceWorker
-    .register(swUrl)
-    .then(registration => {
-      registration.onupdatefound = () => {
-        const installingWorker = registration.installing;
-        if (installingWorker == null) {
-          return;
-        }
-        installingWorker.onstatechange = () => {
-          if (installingWorker.state === 'installed') {
-            if (navigator.serviceWorker.controller) {
-              // At this point, the updated precached content has been fetched,
-              // but the previous service worker will still serve the older
-              // content until all client tabs are closed.
-              console.log(
-                'New content is available and will be used when all ' +
-                  'tabs for this page are closed. See http://bit.ly/CRA-PWA.'
-              );
-
-              // Execute callback
-              if (config && config.onUpdate) {
-                config.onUpdate(registration);
-              }
-            } else {
-              // At this point, everything has been precached.
-              // It's the perfect time to display a
-              // "Content is cached for offline use." message.
-              console.log('Content is cached for offline use.');
-
-              // Execute callback
-              if (config && config.onSuccess) {
-                config.onSuccess(registration);
-              }
-            }
-          }
-        };
-      };
-    })
-    .catch(error => {
-      console.error('Error during service worker registration:', error);
-    });
-}
-
-function checkValidServiceWorker(swUrl, config) {
-  // Check if the service worker can be found. If it can't reload the page.
-  fetch(swUrl)
-    .then(response => {
-      // Ensure service worker exists, and that we really are getting a JS file.
-      const contentType = response.headers.get('content-type');
-      if (
-        response.status === 404 ||
-        (contentType != null && contentType.indexOf('javascript') === -1)
-      ) {
-        // No service worker found. Probably a different app. Reload the page.
-        navigator.serviceWorker.ready.then(registration => {
-          registration.unregister().then(() => {
-            window.location.reload();
-          });
-        });
-      } else {
-        // Service worker found. Proceed as normal.
-        registerValidSW(swUrl, config);
-      }
-    })
-    .catch(() => {
-      console.log(
-        'No internet connection found. App is running in offline mode.'
-      );
-    });
-}
-
-export function unregister() {
-  if ('serviceWorker' in navigator) {
-    navigator.serviceWorker.ready.then(registration => {
-      registration.unregister();
-    });
-  }
-}