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Code Issues Projects Releases Wiki Activity

SW WebTorrent partial

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This commit is contained in:
Mitra Ardron 2018-04-16 08:56:13 +10:00
parent d527236697
commit a689e730d5
4 changed files with 68 additions and 33 deletions
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5
API.md
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@ -225,10 +225,11 @@ returns: Dictionary of Key:Value pairs, note take care if this could
```
###Transports - other functions
#####static async p_f_createReadStream(url, verbose, options)
#####static async p_f_createReadStream(url, {wanturl, verbose})
Provide a function of the form needed by <VIDEO> tag and renderMedia library etc
```
url Urlsof stream
wanturl True if want the URL of the stream (for service workers)
returns f(opts) => stream returning bytes from opts.start || start of file to opts.end-1 || end of file
```
@ -353,7 +354,7 @@ static async p_rawlist(urls, {verbose})|[sigs]|Tries all and combines results
static async p_rawadd(urls, sig, {verbose})||Tries on all urls, error if none succeed
static listmonitor(urls, cb)||Tries on all urls (so note cb may be called multiple times)
static p_newlisturls(cl, {verbose})|[urls]|Tries all and combines results
static async p_f_createReadStream(urls, verbose, options)|f(opts)=>stream|Returns first success
static async p_f_createReadStream(urls, options)|f(opts)=>stream|Returns first success
static async p_get(urls, keys, {verbose})|currently returns on first success, TODO - will combine results and relay across transports
static async p_set(urls, keyvalues, value, {verbose})|Tries all, error if none succeed
static async p_delete(urls, keys, {verbose})|Tries all, error if none succeed

2
TransportIPFS.js
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@ -309,7 +309,7 @@ class TransportIPFS extends Transport {
console.log(err.message);
}
}
async p_f_createReadStream(url, verbose=false) { // Asynchronously return a function that can be used in createReadStream TODO-API
async p_f_createReadStream(url, {verbose=false}={}) { // Asynchronously return a function that can be used in createReadStream TODO-API
verbose = true;
if (verbose) console.log("p_f_createReadStream",url);
const mh = TransportIPFS.multihashFrom(url);

76
TransportWEBTORRENT.js
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@ -96,14 +96,14 @@ class TransportWEBTORRENT extends Transport {
webtorrentparseurl(url) {
/* Parse a URL
url: URL as string or already parsed into Url
url: URL as string or already parsed into Url - should start magnet: or in future might support dweb:/magnet/; some other formats might be supported
returns: torrentid, path
*/
if (!url) {
throw new errors.CodingError("TransportWEBTORRENT.p_rawfetch: requires url");
}
const urlstring = typeof url === "string" ? url : url.href
const urlstring = (typeof url === "string" ? url : url.href)
const index = urlstring.indexOf('/');
if (index === -1) {
@ -159,12 +159,10 @@ class TransportWEBTORRENT extends Transport {
const file = torrent.files.find(file => {
return file.path === filePath;
});
if (!file) {
//debugger;
throw new errors.TransportError("Requested file (" + path + ") not found within torrent ");
}
return file;
}
@ -189,7 +187,7 @@ class TransportWEBTORRENT extends Transport {
const { torrentId, path } = this.webtorrentparseurl(url);
this.p_webtorrentadd(torrentId)
.then((torrent) => {
torrent.deselect(0, torrent.pieces.length - 1, false); // Dont download entire torrent as will pull just the file we want
torrent.deselect(0, torrent.pieces.length - 1, false); // Dont download entire torrent as will pull just the file we want (warning - may give problems if multiple reads from same webtorrent)
const file = this.webtorrentfindfile(torrent, path);
file.getBuffer((err, buffer) => {
if (err) {
@ -202,16 +200,50 @@ class TransportWEBTORRENT extends Transport {
});
}
async p_f_createReadStream(url, verbose) { //TODO-API
if (verbose) console.log("TransportWEBTORRENT p_f_createreadstream %o", url);
async _p_fileTorrentFromUrl(url) {
/*
Then open a webtorrent for the file specified in the path part of the url
url: of form magnet:... or magnet/:...
return: Web Torrent file
*/
try {
const {torrentId, path} = this.webtorrentparseurl(url);
let torrent = await this.p_webtorrentadd(torrentId);
let filet = this.webtorrentfindfile(torrent, path);
torrent.deselect(0, torrent.pieces.length - 1, false); // Dont download entire torrent as will pull just the file we want (warning - may give problems if multiple reads from same webtorrent)
return this.webtorrentfindfile(torrent, path);
} catch(err) {
console.log(`p_fileFrom failed on ${url} ${err.message}`);
throw(err);
};
}
async p_f_createReadStream(url, {verbose=false, wanturl=false}={}) { //TODO-API
/*
Fetch bytes progressively, using a node.js readable stream, based on a url of the form:
No assumption is made about the data in terms of size or structure.
This is the initializtion step, which returns a function suitable for <VIDEO>
Returns a new Promise that resolves to function for a node.js readable stream.
Node.js readable stream docs: https://nodejs.org/api/stream.html#stream_readable_streams
:param string url: URL of object being retrieved of form magnet:xyzabc/path/to/file (Where xyzabc is the typical magnet uri contents)
:param boolean verbose: true for debugging output
:resolves to: f({start, end}) => stream (The readable stream.)
:throws: TransportError if url invalid - note this happens immediately, not as a catch in the promise
*/
if (verbose) console.log("TransportWEBTORRENT p_f_createreadstream %o", url);
try {
let filet = this._p_fileTorrentFromUrl(url);
let self = this;
return function (opts) {
return self.createReadStream(filet, opts, verbose);
};
if (wanturl) {
return url;
} else {
return function (opts) { return self.createReadStream(filet, opts, verbose); };
}
} catch(err) {
console.log(`p_f_createReadStream failed on ${url} ${err.message}`);
throw(err);
@ -220,35 +252,31 @@ class TransportWEBTORRENT extends Transport {
createReadStream(file, opts, verbose) {
/*
Fetch bytes progressively, using a node.js readable stream, based on a url of the form:
The function, encapsulated and inside another function by p_f_createReadStream (see docs)
magnet:xyzabc/path/to/file
(Where xyzabc is the typical magnet uri contents)
No assumption is made about the data in terms of size or structure. Returns a new Promise that resolves to a node.js readable stream.
Node.js readable stream docs:
https://nodejs.org/api/stream.html#stream_readable_streams
:param string url: URL of object being retrieved
:param file: Webtorrent "file" as returned by webtorrentfindfile
:param opts: { start: byte to start from; end: optional end byte }
:param boolean verbose: true for debugging output
:returns stream: The readable stream.
:throws: TransportError if url invalid - note this happens immediately, not as a catch in the promise
*/
if (verbose) console.log("TransportWEBTORRENT createreadstream %o %o", file.name, opts);
try {
const through = new stream.PassThrough();
const fileStream = file.createReadStream(opts);
fileStream.pipe(through);
return through;
} catch(err) {
console.log("TransportWEBTORRENT caught error", err)
if (typeof through.destroy === 'function') through.destroy(err)
else through.emit('error', err)
};
}
async p_createReadStream(url, opts, verbose) {
let filet = await this._p_fileTorrentFromUrl(url);
return this.createReadStream(filet, opts, verbose);
}
static async p_test(opts, verbose) {
try {
let transport = await this.p_setup(opts, verbose); // Assumes IPFS already setup

18
Transports.js
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@ -33,7 +33,10 @@ class Transports {
*/
return this._transports.map((t) => { return {"name": t.name, "status": t.status}})
}
static async p_urlsValidFor(urls, func, options) {
// Need a async version of this for serviceworker and TransportsProxy
return this.validFor(urls, func, options).map((ut) => ut[0]);
}
static validFor(urls, func, options) {
/*
Finds an array or Transports that can support this URL.
@ -65,6 +68,11 @@ class Transports {
return Transports._connected().find((t) => t.name === "IPFS")
}
static webtorrent(verbose) {
// Find an ipfs transport if it exists, so for example ServiceWorker.p_respondWebTorrent can use it.
return Transports._connected().find((t) => t.name === "WEBTORRENT")
}
static async p_resolveNames(urls) {
/* If and only if TransportNAME was loaded (it might not be as it depends on higher level classes like Domain and SmartDict)
then resolve urls that might be names, returning a modified array.
@ -233,12 +241,12 @@ class Transports {
// Stream handling ===========================================
static async p_f_createReadStream(urls, verbose, options) { // Note options is options for selecting a stream, not the start/end in a createReadStream call
static async p_f_createReadStream(urls, {verbose=false, wanturl=false}={}) { // Note options is options for selecting a stream, not the start/end in a createReadStream call
/*
urls: Urls of the stream
returns: f(opts) => stream returning bytes from opts.start || start of file to opts.end-1 || end of file
*/
let tt = this.validFor(urls, "createReadStream", options); //[ [Url,t],[Url,t]] // Passing options - most callers will ignore TODO-STREAM support options in validFor
let tt = this.validFor(urls, "createReadStream", {}); //[ [Url,t],[Url,t]] // Can pass options TODO-STREAM support options in validFor
if (!tt.length) {
throw new errors.TransportError("Transports.p_createReadStream cant find any transport for urls: " + urls);
}
@ -246,7 +254,7 @@ class Transports {
let errs = [];
for (const [url, t] of tt) {
try {
return await t.p_f_createReadStream(url, verbose);
return await t.p_f_createReadStream(url, {verbose, wanturl} );
} catch (err) {
errs.push(err);
console.log("Could not retrieve ", url.href, "from", t.name, err.message);
@ -510,12 +518,10 @@ class Transports {
if (! tabbrevs.length) { tabbrevs = ["HTTP", "YJS", "IPFS", "WEBTORRENT"]; }
tabbrevs = tabbrevs.map(n => n.toUpperCase());
let transports = this.setup0(tabbrevs, options, verbose);
//TODO-SW copy this statuselement buildout somewhere for proxy too
if (options.statuscb) {
this.statuscb = options.statuscb;
}
if (!!options.statuselement) {
//TODO-SW need to return status through messages
while (statuselement.lastChild) {statuselement.removeChild(statuselement.lastChild); } // Remove any exist status
statuselement.appendChild(
utils.createElement("UL", {}, transports.map(t => {