better router, add sharing support

package-lock.json

@@ -8047,6 +8047,11 @@
         "inherits": "^2.0.1"
       }
     },
+    "route-parser": {
+      "version": "0.0.5",
+      "resolved": "https://registry.npmjs.org/route-parser/-/route-parser-0.0.5.tgz",
+      "integrity": "sha1-fR0J0zXkkJQDHqFpkaSnmwG74fQ="
+    },
     "safe-buffer": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",

package.json

@@ -27,13 +27,14 @@
     "date-fns": "^2.9.0",
     "get-urls": "^9.2.0",
     "iter-tools": "^7.0.0-rc.0",
+    "route-parser": "0.0.5",
     "svelte-routing": "^1.4.0"
   },
   "browserslist": [
     "last 1 chrome versions"
   ],
   "staticFiles": {
-    "staticPath": "public",
+    "staticPath": "static",
     "watcherGlob": "**"
   }
 }

src/components/App.svelte

@@ -1,10 +1,19 @@
 <Router>
-    <Route path="/share/:domain/:statusId" component={Share} />
+    {#each routes as { duplex, component }}
-    <Route path="/" component={Home} />
+        <Route path={duplex.spec} component={component} />
+    {/each}
 </Router>
 
 <script>
     import { Router, Route } from 'svelte-routing'
+    import { home, share } from '/routes.js'
     import Home from '/routes/Home.svelte'
     import Share from '/routes/Share.svelte'
+
+    const pair = (duplex, component) => ({ duplex, component })
+
+    const routes = [
+        pair(share, Share),
+        pair(home, Home)
+    ]
 </script>

src/components/Queue.svelte

@@ -4,7 +4,7 @@
     {#if $next}
         <div class="entry" on:click={() => select($next)}>
             <div class="title">{$next.title}</div>
-            <div class="user">by {$next.username}</div>
+            <div class="user">by {$next.referer.username}</div>
         </div>
     {/if}
 
@@ -18,7 +18,7 @@
     {#each history as track}
         <div class="entry" class:active={track === $current} on:click={() => select(track)}>
             <div class>{track.title}</div>
-            <div class>shared by {track.username}</div>
+            <div class>shared by {track.referer.username}</div>
         </div>
     {/each}
 </div>

src/components/Radio.svelte

@@ -21,26 +21,38 @@
 
 <script>
     import { onMount, onDestroy } from 'svelte'
-    import { get } from 'svelte/store'
+    import { derived, get } from 'svelte/store'
 
     import Header from '/components/layout/Header.svelte'
     import Footer from '/components/layout/Footer.svelte'
     import Controls from '/components/Controls.svelte'
     import Queue from '/components/Queue.svelte'
     import Viewer from '/components/Viewer.svelte'
-    import { hashtagsIterator } from '/services/mastodon.js'
+    import { radioIterator, radioShareIterator } from '/services/radio.js'
-    import { tracksIterator } from '/services/misc.js'
+    import { fetchStatus } from '/services/mastodon.js'
 
     import { domain, hashtags, queue, next, current, enqueueing, select } from '/store.js'
+    import DeepSet from '/services/deep-set.js'
+
+    export let share
+
+    const cache = new DeepSet()
 
     let nextUnsubcribe = null
     let currentUnsubcribe = null
 
     onMount(async () => {
-        const domainValue = get(domain)
+        let iterator
-        const hashtagsValue = get(hashtags)
 
-        const iterator = tracksIterator(hashtagsIterator(domainValue, hashtagsValue))
+        if (share != null) {
+            const track = await fetchStatus(share.domain, share.id)
+            iterator = radioShareIterator(track, get(domain), get(hashtags), cache)
+        } else {
+            iterator = radioIterator(get(domain), get(hashtags), cache)
+        }
+
+        // generated multiples times cannot usable and don't free resources
+        // const iterator = derived([domain, hashtags], ([$domain, $hashtags]) => radioIterator($domain, $hashtags))
 
         const { value: first } = await iterator.next()
 

src/routes.js

@@ -0,0 +1,4 @@
+import Route from 'route-parser'
+
+export const home = new Route('/')
+export const share = new Route('/share/:domain/:id')

src/routes/Home.svelte

@@ -1,4 +1,4 @@
-<Radio />
+<Radio share={null} />
 
 <script>
     import Radio from '/components/Radio.svelte'

src/routes/Share.svelte

@@ -1,16 +1,14 @@
-<Radio />
+<Radio share={refererCredentials} />
 
 <script>
-    import { onMount } from 'svelte'
     import Radio from '/components/Radio.svelte'
-    import { fetchStatus } from '/services/mastodon.js'
 
     export let domain
-    export let statusId
+    export let id
 
-
+    const refererCredentials = {
-    onMount(async () => {
+        type: 'mastodon',
-        const status = await fetchStatus(domain, statusId)
+        domain,
-        console.log(`Status ${statusId} from ${domain} shared`)
+        id
-    })
+    }
 </script>

src/services/deep-set.js

@@ -0,0 +1,41 @@
+export default class DeepSet {
+    constructor() {
+        this.map = new Map()
+        this.set = new Set()
+    }
+
+    _reduce(path) {
+        return path.reduce((context, key) => {
+            if (context.map.has(key)) {
+                return context.map.get(key)
+            } else {
+                const newContext = new DeepSet()
+                context.map.set(key, newContext)
+                return newContext
+            }
+        }, this).set
+    }
+
+    has(values) {
+        const { keys, value } = destruct(values)
+        return this._reduce(keys).has(value)
+    }
+
+    add(values) {
+        const { keys, value } = destruct(values)
+        return this._reduce(keys).add(value)
+    }
+}
+
+const destruct = xs => {
+    switch (xs.length) {
+        case 0:
+            return { keys: [], value: undefined }
+
+        case 1:
+            return { keys: [], value: xs[0] }
+
+        default:
+            return { keys: xs.slice(0, xs.length - 1), value: xs.slice(-1)[0] }
+    }
+}

src/services/mastodon.js

@@ -1,5 +1,6 @@
 import Observable from 'core-js-pure/features/observable'
-import { observableToAsyncIterator, raceIterator } from '/services/misc.js'
+import getUrls from 'get-urls'
+import { observableToAsyncIterator, raceIterator, urlsToMedia } from '/services/misc.js'
 
 const LINK_RE = /<(.+?)>; rel="(\w+)"/gi
 
@@ -13,7 +14,9 @@ function parseLinkHeader(link) {
     return links
 }
 
-export const fetchStatus = (domain, id) => fetch(`https://${domain}/api/v1/statuses/${id}`).then(x => x.json())
+export const fetchStatus = (domain, id) => fetch(`https://${domain}/api/v1/statuses/${id}`)
+    .then(response => response.json())
+    .then(status => processStatus(domain, status))
 
 // Observable<{ domain : string, hashtag : string, status : Status}>
 export const hashtagStreamingObservable = (domain, hashtag) => {
@@ -43,6 +46,7 @@ export const hashtagStreamingObservable = (domain, hashtag) => {
             eventSource.removeEventListener('open', onOpen)
             eventSource.removeEventListener('update', onStatus)
             eventSource.removeEventListener('error', onError)
+            eventSource.close()
         }
     })
 }
@@ -92,14 +96,13 @@ export async function* hashtagsIterator (domain, hashtags) {
 }
 
 const processStatus = (domain, status) => ({
-    title: null,
+    title: '',
-    username: status.account.username,
     date: new Date(status.createdAt),
-    content: status.content,
     referer: {
+        username: status.account.username,
         url: status.url,
         credentials: { type: 'mastodon', domain, id: status.id }
     },
-    media: null
+    media: urlsToMedia(getUrls(status.content))
 })
 

src/services/misc.js

@@ -1,4 +1,3 @@
-import getUrls from 'get-urls'
 import { execPipe, asyncFilter, asyncMap, map, findOr } from 'iter-tools'
 
 export const tap = f => x => {
@@ -92,129 +91,82 @@ export async function* raceIterator(iterators) {
     }
 }
 
-const mkMapSet = () => ({ set: new Set(), children: new Map() })
+export async function* tracksIterator(statusesIterator, cache) {
-
-const pathSet = () => {
-    const root = mkMapSet()
-
-    const has = (keys, value) => {
-        let x = root
-
-        for (const key of keys) {
-            if (x.children.has(key)) {
-                x = x.children.get(key)
-            } else {
-                return false
-            }
-        }
-
-        return x.set.has(value)
-    }
-
-    const add = (keys, value) => {
-        let x = root
-
-        for (const key of keys) {
-            if (!x.children.has(key)) {
-                x.children.set(key, mkMapSet())
-            }
-
-            x = x.children.get(key)
-        }
-
-        x.set.add(value)
-    }
-
-    return { root, has, add }
-}
-
-export async function* tracksIterator(statusesIterator) {
-    const known = pathSet()
-
     yield* execPipe(
         statusesIterator,
-        asyncFilter(knownByReferer(known)),
+        asyncFilter(track => track != null), // should not be necessary
-        asyncMap(processReferer),
+        asyncFilter(notKnown(cache)),
-        asyncFilter(knownByMedia(known)),
+        asyncMap(completeTrack)
-        asyncMap(processMedia)
     )
 }
 
-const knownByReferer = known => track => {
+const notKnown = cache => track => {
     if (!track) {
-        console.error(`No status, should not happen here`)
+        console.error(`No track, should not happen here`)
         return false
+    }
+
+    const isKnown = (values) => {
+        if (cache.has(values)) {
+            console.log(`Drop already processed ${values.join(':')}`)
+            return true
         } else {
+            cache.add(values)
+            return false
+        }
+    }
+
     switch (track.referer.credentials.type) {
         default:
             throw new Error()
 
         case 'mastodon':
-                const path = [
+            if (isKnown([
                 'referer',
                 'mastodon',
-                    track.referer.credentials.domain
+                track.referer.credentials.domain,
-                ]
+                track.referer.credentials.id
-
+            ])) {
-                const id = track.referer.credentials.id
+                return false
-
+            }
-                if (known.has(path, id)) {
+
-                    console.log(`Drop already processed referer ${id}`)
+            break;
+    }
+
+    if (track.media == null) {
         return false
-                } else {
-                    known.add(path, id)
-                    return true
-                }
-        }
-    }
     }
 
-const knownByMedia = known => track => {
-    if (track !== null) {
     switch (track.media.credentials.type) {
         default:
             throw new Error()
 
         case 'youtube':
-                const path = [
+            if (isKnown([
                 'media',
-                    'youtube'
+                'youtube',
-                ]
+                track.media.credentials.id
-
+            ])) {
-                const id = track.media.credentials.id
-
-                if (known.has(path, id)) {
-                    console.log(`Drop already processed media ${id}`)
                 return false
-                } else {
+            }
-                    known.add(path, id)
+
+            break
+    }
+
     return true
 }
-        }
+
-    } else {
+const completeTrack = async track => {
-        return false
+    const metadata = await fetchMetadata(track.media)
-    }
+    return { ...track, title: metadata.title }
 }
 
-const processReferer = track => {
+export const urlsToMedia = urls => {
-    const urls = getUrls(track.content)
+    return execPipe(
-
-    const media = execPipe(
         urls,
         map(parseSource),
         findOr(null, x => x !== null)
     )
-
-    if (media) {
-        return { ...track, media }
-    } else {
-        return null
-    }
-}
-
-const processMedia = async track => {
-    const metadata = await fetchMetadata(track.media)
-    return { ...track, title: metadata.title }
 }
 
 const parseSource = (url) => {

src/services/radio.js

@@ -0,0 +1,9 @@
+import { asyncPrepend } from 'iter-tools'
+import { hashtagsIterator } from '/services/mastodon.js'
+import { tracksIterator } from '/services/misc.js'
+
+export const radioIterator = (domain, hashtags, cache) =>
+    tracksIterator(hashtagsIterator(domain, hashtags), cache)
+
+export const radioShareIterator = (track, domain, hashtags, cache) =>
+    tracksIterator(asyncPrepend(track, hashtagsIterator(domain, hashtags)), cache)