web: refactor ContentLoader

8 files changed, 159 insertions, 115 deletions

diff --git a/web/src/js/components/ContentView.jsx b/web/src/js/components/ContentView.jsx
index 80dec0f4..9ec0266b 100644
--- a/web/src/js/components/ContentView.jsx
+++ b/web/src/js/components/ContentView.jsx
@@ -1,10 +1,11 @@
 import React, { Component, PropTypes } from 'react'
 import { connect } from 'react-redux'
-import { MessageUtils } from '../flow/utils.js'
 import * as ContentViews from './ContentView/ContentViews'
 import * as MetaViews from './ContentView/MetaViews'
-import ContentLoader from './ContentView/ContentLoader'
 import ViewSelector from './ContentView/ViewSelector'
+import UploadContentButton from './ContentView/UploadContentButton'
+import DownloadContentButton from './ContentView/DownloadContentButton'
+
 import { setContentView, displayLarge, updateEdit } from '../ducks/ui/flow'
 
 ContentView.propTypes = {
@@ -18,7 +19,7 @@ ContentView.propTypes = {
 ContentView.isContentTooLarge = msg => msg.contentLength > 1024 * 1024 * (ContentViews.ViewImage.matches(msg) ? 10 : 0.2)
 
 function ContentView(props) {
-    const { flow, message, contentView, selectView, displayLarge, setDisplayLarge, uploadContent, onContentChange, content, readonly } = props
+    const { flow, message, contentView, selectView, displayLarge, setDisplayLarge, uploadContent, onContentChange, readonly } = props
 
     if (message.contentLength === 0) {
         return <MetaViews.ContentEmpty {...props}/>
@@ -35,34 +36,14 @@ function ContentView(props) {
     const View = ContentViews[contentView]
     return (
         <div>
-            {View.textView ? (
-                <ContentLoader flow={flow}  readonly={readonly} message={message}>
-                    <View readonly={readonly} onChange={onContentChange} content="" />
-                </ContentLoader>
-            ) : (
-                <View flow={flow} readonly={readonly} onChange={onContentChange} content={content} message={message} />
-            )}
+            <View flow={flow} message={message} readonly={readonly} onChange={onContentChange}/>
+
             <div className="view-options text-center">
                 <ViewSelector onSelectView={selectView} active={View} message={message}/>
                 &nbsp;
-                <a className="btn btn-default btn-xs"
-                   href={MessageUtils.getContentURL(flow, message)}
-                   title="Download the content of the flow.">
-                    <i className="fa fa-download"/>
-                </a>
+                <DownloadContentButton flow={flow} message={message}/>
                 &nbsp;
-                <a  className="btn btn-default btn-xs"
-                    onClick={() => ContentView.fileInput.click()}
-                    title="Upload a file to replace the content."
-                >
-                    <i className="fa fa-upload"/>
-                </a>
-                <input
-                    ref={ref => ContentView.fileInput = ref}
-                    className="hidden"
-                    type="file"
-                    onChange={e => {if(e.target.files.length > 0) uploadContent(e.target.files[0])}}
-                />
+                <UploadContentButton uploadContent={uploadContent}/>
             </div>
         </div>
     )
diff --git a/web/src/js/components/common/CodeEditor.jsx b/web/src/js/components/ContentView/CodeEditor.jsx
index 95f1b98b..95f1b98b 100644
--- a/web/src/js/components/common/CodeEditor.jsx
+++ b/web/src/js/components/ContentView/CodeEditor.jsx
diff --git a/web/src/js/components/ContentView/ContentLoader.jsx b/web/src/js/components/ContentView/ContentLoader.jsx
index eff82d05..fb022df6 100644
--- a/web/src/js/components/ContentView/ContentLoader.jsx
+++ b/web/src/js/components/ContentView/ContentLoader.jsx
@@ -1,58 +1,34 @@
 import React, { Component, PropTypes } from 'react'
 import { MessageUtils } from '../../flow/utils.js'
-// This is the only place where we use jQuery.
-// Remove when possible.
-import $ from "jquery"
 
-export default class ContentLoader extends Component {
+export default View => class extends React.Component {
+
+    static displayName = View.displayName || View.name
+    static matches = View.matches
 
     static propTypes = {
+        ...View.propTypes,
+        content: PropTypes.string,  // mark as non-required
         flow: PropTypes.object.isRequired,
         message: PropTypes.object.isRequired,
     }
 
-    constructor(props, context) {
-        super(props, context)
-        this.state = { content: null, request: null }
-    }
-
-    requestContent(nextProps) {
-        if (this.state.request) {
-            this.state.request.abort()
+    constructor(props) {
+        super(props)
+        this.state = {
+            content: undefined,
+            request: undefined,
         }
-
-        const requestUrl = MessageUtils.getContentURL(nextProps.flow, nextProps.message)
-        const request = $.get(requestUrl)
-
-        this.setState({ content: null, request })
-
-        request
-            .done(content => {
-                this.setState({ content })
-            })
-            .fail((xhr, textStatus, errorThrown) => {
-                if (textStatus === 'abort') {
-                    return
-                }
-                this.setState({ content: `AJAX Error: ${textStatus}\r\n${errorThrown}` })
-            })
-            .always(() => {
-                this.setState({ request: null })
-            })
     }
 
     componentWillMount() {
-        this.requestContent(this.props)
+        this.startRequest(this.props)
     }
 
     componentWillReceiveProps(nextProps) {
-        let reload = nextProps.message !== this.props.message
-        let isUserEdit = !nextProps.readonly && nextProps.message.content
-
-        if (isUserEdit)
-            this.setState({content: nextProps.message.content})
-        else if(reload)
-            this.requestContent(nextProps)
+        if (nextProps.message.contentHash !== this.props.message.contentHash) {
+            this.startRequest(nextProps)
+        }
     }
 
     componentWillUnmount() {
@@ -61,15 +37,50 @@ export default class ContentLoader extends Component {
         }
     }
 
+    startRequest(props) {
+        if (this.state.request) {
+            this.state.request.abort()
+        }
+        let requestUrl = MessageUtils.getContentURL(props.flow, props.message)
+
+        // We use XMLHttpRequest instead of fetch() because fetch() is not (yet) abortable.
+        let request = new XMLHttpRequest();
+        request.addEventListener("load", this.requestComplete.bind(this, request));
+        request.addEventListener("error", this.requestFailed.bind(this, request));
+        request.open("GET", requestUrl);
+        request.send();
+        this.setState({ request, content: undefined })
+    }
+
+    requestComplete(request, e) {
+        if (request !== this.state.request) {
+            return // Stale request
+        }
+        this.setState({
+            content: request.responseText,
+            request: undefined
+        })
+    }
+
+    requestFailed(request, e) {
+        if (request !== this.state.request) {
+            return // Stale request
+        }
+        console.error(e)
+        // FIXME: Better error handling
+        this.setState({
+            content: "Error getting content.",
+            request: undefined
+        })
+    }
+
     render() {
         return this.state.content ? (
-            React.cloneElement(this.props.children, {
-                content: this.state.content
-            })
+            <View content={this.state.content} {...this.props}/>
         ) : (
             <div className="text-center">
                 <i className="fa fa-spinner fa-spin"></i>
             </div>
         )
     }
-}
+};
diff --git a/web/src/js/components/ContentView/ContentViews.jsx b/web/src/js/components/ContentView/ContentViews.jsx
index b39e545a..a1adebea 100644
--- a/web/src/js/components/ContentView/ContentViews.jsx
+++ b/web/src/js/components/ContentView/ContentViews.jsx
@@ -1,20 +1,16 @@
 import React, { PropTypes } from 'react'
 import ContentLoader from './ContentLoader'
-import { MessageUtils } from '../../flow/utils.js'
-import CodeEditor from '../common/CodeEditor'
+import { MessageUtils } from '../../flow/utils'
+import CodeEditor from './CodeEditor'
 
 
-const views = [ViewAuto, ViewImage, ViewJSON, ViewRaw]
-
-ViewImage.regex = /^image\/(png|jpe?g|gif|vnc.microsoft.icon|x-icon)$/i
-ViewImage.matches = msg => ViewImage.regex.test(MessageUtils.getContentType(msg))
-
+const isImage = /^image\/(png|jpe?g|gif|vnc.microsoft.icon|x-icon)$/i
+ViewImage.matches = msg => isImage.test(MessageUtils.getContentType(msg))
 ViewImage.propTypes = {
     flow: PropTypes.object.isRequired,
     message: PropTypes.object.isRequired,
 }
-
-export function ViewImage({ flow, message }) {
+function ViewImage({ flow, message }) {
     return (
         <div className="flowview-image">
             <img src={MessageUtils.getContentURL(flow, message)} alt="preview" className="img-thumbnail"/>
@@ -22,26 +18,23 @@ export function ViewImage({ flow, message }) {
     )
 }
 
-ViewRaw.textView = true
-ViewRaw.matches = () => true
 
+ViewRaw.matches = () => true
 ViewRaw.propTypes = {
     content: React.PropTypes.string.isRequired,
 }
-
-export function ViewRaw({ content, readonly, onChange }) {
+function ViewRaw({ content, readonly, onChange }) {
     return readonly ? <pre>{content}</pre> : <CodeEditor content={content} onChange={onChange}/>
 }
+ViewRaw = ContentLoader(ViewRaw)
 
-ViewJSON.textView = true
-ViewJSON.regex = /^application\/json$/i
-ViewJSON.matches = msg => ViewJSON.regex.test(MessageUtils.getContentType(msg))
 
+const isJSON = /^application\/json$/i
+ViewJSON.matches = msg => isJSON.test(MessageUtils.getContentType(msg))
 ViewJSON.propTypes = {
     content: React.PropTypes.string.isRequired,
 }
-
-export function ViewJSON({ content }) {
+function ViewJSON({ content }) {
     let json = content
     try {
         json = JSON.stringify(JSON.parse(content), null, 2);
@@ -50,23 +43,18 @@ export function ViewJSON({ content }) {
     }
     return <pre>{json}</pre>
 }
+ViewJSON = ContentLoader(ViewJSON)
 
 
 ViewAuto.matches = () => false
-ViewAuto.findView = msg => views.find(v => v.matches(msg)) || views[views.length - 1]
-
+ViewAuto.findView = msg => [ViewImage, ViewJSON, ViewRaw].find(v => v.matches(msg)) || ViewRaw
 ViewAuto.propTypes = {
     message: React.PropTypes.object.isRequired,
     flow: React.PropTypes.object.isRequired,
 }
-
-export function ViewAuto({ message, flow, readonly, onChange }) {
+function ViewAuto({ message, flow, readonly, onChange }) {
     const View = ViewAuto.findView(message)
-    if (View.textView) {
-        return <ContentLoader message={message} flow={flow}><View readonly={readonly} onChange={onChange}  content="" /></ContentLoader>
-    } else {
-        return <View readonly={readonly} message={message} flow={flow} />
-    }
+    return <View message={message} flow={flow} readonly={readonly} onChange={onChange}/>
 }
 
-export default views
+export { ViewImage, ViewRaw, ViewAuto, ViewJSON }
diff --git a/web/src/js/components/ContentView/DownloadContentButton.jsx b/web/src/js/components/ContentView/DownloadContentButton.jsx
new file mode 100644
index 00000000..3f11f909
--- /dev/null
+++ b/web/src/js/components/ContentView/DownloadContentButton.jsx
@@ -0,0 +1,18 @@
+import { MessageUtils } from "../../flow/utils"
+import { PropTypes } from 'react'
+
+DownloadContentButton.propTypes = {
+    flow: PropTypes.object.isRequired,
+    message: PropTypes.object.isRequired,
+}
+
+export default function DownloadContentButton({ flow, message }) {
+
+    return (
+        <a className="btn btn-default btn-xs"
+           href={MessageUtils.getContentURL(flow, message)}
+           title="Download the content of the flow.">
+            <i className="fa fa-download"/>
+        </a>
+    )
+}
diff --git a/web/src/js/components/ContentView/UploadContentButton.jsx b/web/src/js/components/ContentView/UploadContentButton.jsx
new file mode 100644
index 00000000..0652b584
--- /dev/null
+++ b/web/src/js/components/ContentView/UploadContentButton.jsx
@@ -0,0 +1,28 @@
+import { PropTypes } from 'react'
+
+UploadContentButton.propTypes = {
+    uploadContent: PropTypes.func.isRequired,
+}
+
+export default function UploadContentButton({ uploadContent }) {
+
+    let fileInput;
+
+    return (
+        <a className="btn btn-default btn-xs"
+           onClick={() => fileInput.click()}
+           title="Upload a file to replace the content.">
+            <i className="fa fa-upload"/>
+            <input
+                ref={ref => fileInput = ref}
+                className="hidden"
+                type="file"
+                onChange={e => {
+                    if (e.target.files.length > 0) uploadContent(e.target.files[0])
+                }}
+            />
+        </a>
+
+    )
+}
+
diff --git a/web/src/js/components/ContentView/ViewSelector.jsx b/web/src/js/components/ContentView/ViewSelector.jsx
index 9b151a5b..973d2333 100644
--- a/web/src/js/components/ContentView/ViewSelector.jsx
+++ b/web/src/js/components/ContentView/ViewSelector.jsx
@@ -1,28 +1,47 @@
 import React, { PropTypes } from 'react'
 import classnames from 'classnames'
-import views, { ViewAuto } from './ContentViews'
+import { connect } from 'react-redux'
+import * as ContentViews from './ContentViews'
+import { setContentView } from "../../ducks/ui/flow";
+
+
+function ViewButton({ name, setContentView, children, activeView }) {
+    return (
+        <button
+            onClick={() => setContentView(name)}
+            className={classnames('btn btn-default', { active: name === activeView })}>
+            {children}
+        </button>
+    )
+}
+ViewButton = connect(state => ({
+    activeView: state.ui.flow.contentView
+}), {
+    setContentView
+})(ViewButton)
+
 
 ViewSelector.propTypes = {
-    active: PropTypes.func.isRequired,
     message: PropTypes.object.isRequired,
-    onSelectView: PropTypes.func.isRequired,
 }
+export default function ViewSelector({ message }) {
+
+    let autoView = ContentViews.ViewAuto.findView(message)
+    let autoViewName = (autoView.displayName || autoView.name)
+        .toLowerCase()
+        .replace('view', '')
+        .replace(/ContentLoader\((.+)\)/,"$1")
 
-export default function ViewSelector({ active, message, onSelectView }) {
     return (
         <div className="view-selector btn-group btn-group-xs">
-            {views.map(View => (
-                <button
-                    key={View.name}
-                    onClick={() => onSelectView(View.name)}
-                    className={classnames('btn btn-default', { active: View === active })}>
-                    {View === ViewAuto ? (
-                        `auto: ${ViewAuto.findView(message).name.toLowerCase().replace('view', '')}`
-                    ) : (
-                        View.name.toLowerCase().replace('view', '')
-                    )}
-                </button>
-            ))}
+
+            <ViewButton name="AutoView">auto: {autoViewName}</ViewButton>
+
+            {Object.keys(ContentViews).map(name =>
+                name !== "ViewAuto" &&
+                <ViewButton key={name} name={name}>{name.toLowerCase().replace('view', '')}</ViewButton>
+            )}
+
         </div>
     )
 }
diff --git a/web/src/js/utils.js b/web/src/js/utils.js
index cc17c565..e44182d0 100644
--- a/web/src/js/utils.js
+++ b/web/src/js/utils.js
@@ -124,7 +124,6 @@ export const pure = renderFn => class extends React.Component {
     static displayName = renderFn.name
 
     shouldComponentUpdate(nextProps) {
-        console.log(!shallowEqual(this.props, nextProps))
         return !shallowEqual(this.props, nextProps)
     }