Files: bed0b983a87d456d6c072f88bb5f7081614d4ed1 / index.js
11970 bytesRaw
1 | var packCodec = require('js-git/lib/pack-codec') |
2 | var pull = require('pull-stream') |
3 | var cat = require('pull-cat') |
4 | var buffered = require('pull-buffered') |
5 | var pack = require('./pack') |
6 | |
7 | function handleOption(options, name, value) { |
8 | switch (name) { |
9 | case 'verbosity': |
10 | options.verbosity = +value || 0 |
11 | return true |
12 | case 'progress': |
13 | options.progress = !!value && value !== 'false' |
14 | return true |
15 | default: |
16 | console.error('unknown option', name + ': ' + value) |
17 | return false |
18 | } |
19 | } |
20 | |
21 | function capabilitiesSource() { |
22 | return pull.once([ |
23 | 'option', |
24 | 'connect', |
25 | ].join('\n') + '\n\n') |
26 | } |
27 | |
28 | function split2(str, delim) { |
29 | var i = str.indexOf(delim || ' ') |
30 | return (i === -1) ? [str, ''] : [ |
31 | str.substr(0, i), |
32 | str.substr(i + 1) |
33 | ] |
34 | } |
35 | |
36 | function split3(str) { |
37 | var args = split2(str) |
38 | return [args[0]].concat(split2(args[1])) |
39 | } |
40 | |
41 | function optionSource(cmd, options) { |
42 | var args = split2(cmd) |
43 | var msg = handleOption(options, args[0], args[1]) |
44 | msg = (msg === true) ? 'ok' |
45 | : (msg === false) ? 'unsupported' |
46 | : 'error ' + msg |
47 | return pull.once(msg + '\n') |
48 | } |
49 | |
50 | // transform ref objects into lines |
51 | function listRefs(read) { |
52 | var ended |
53 | return function (abort, cb) { |
54 | if (ended) return cb(ended) |
55 | read(abort, function (end, ref) { |
56 | ended = end |
57 | if (end === true) cb(null, '\n') |
58 | if (end) cb(end) |
59 | else cb(null, |
60 | [ref.value, ref.name].concat(ref.attrs || []).join(' ') + '\n') |
61 | }) |
62 | } |
63 | } |
64 | |
65 | // upload-pack: fetch to client |
66 | function uploadPack(read, getObjects, refSource, wantSink, options) { |
67 | /* multi_ack thin-pack side-band side-band-64k ofs-delta shallow no-progress |
68 | * include-tag multi_ack_detailed symref=HEAD:refs/heads/master |
69 | * agent=git/2.7.0 */ |
70 | var sendRefs = receivePackHeader([ |
71 | ], refSource, false) |
72 | |
73 | var lines = packLineDecode(read, options) |
74 | var readHave = lines.haves() |
75 | var acked |
76 | var commonHash |
77 | var sendPack |
78 | var earlyDisconnect |
79 | |
80 | function haveObject(hash, cb) { |
81 | cb(/* TODO */) |
82 | // cb(true) |
83 | } |
84 | |
85 | // Packfile negotiation |
86 | return cat([ |
87 | packLineEncode(cat([ |
88 | sendRefs, |
89 | pull.once(''), |
90 | function (abort, cb) { |
91 | if (abort) return |
92 | if (acked) return cb(true) |
93 | // read upload request (wants list) from client |
94 | var readWant = lines.wants(wantsDone) |
95 | readWant(null, function (end, want) { |
96 | if (end === true) { |
97 | // client disconnected before sending wants |
98 | earlyDisconnect = true |
99 | cb(true) |
100 | } else if (end) { |
101 | cb(end) |
102 | } else { |
103 | wantSink(readWant) |
104 | } |
105 | }) |
106 | |
107 | function wantsDone(err) { |
108 | // console.error('wants done', err, earlyDisconnect) |
109 | if (err) return cb(err) |
110 | if (earlyDisconnect) return cb(true) |
111 | // Read upload haves (haves list). |
112 | // On first obj-id that we have, ACK |
113 | // If we have none, NAK. |
114 | // TODO: implement multi_ack_detailed |
115 | readHave(null, function next(end, have) { |
116 | if (end === true) { |
117 | // found no common object |
118 | acked = true |
119 | cb(null, 'NAK') |
120 | } else if (end) |
121 | cb(end) |
122 | else if (have.type != 'have') |
123 | cb(new Error('Unknown have' + JSON.stringify(have))) |
124 | else |
125 | haveObject(have.hash, function (haveIt) { |
126 | if (!haveIt) |
127 | return readHave(null, next) |
128 | commonHash = haveIt |
129 | acked = true |
130 | cb(null, 'ACK ' + have.hash) |
131 | }) |
132 | }) |
133 | } |
134 | }, |
135 | ])), |
136 | function havesDone(abort, cb) { |
137 | // console.error("haves done", abort && typeof abort, sendPack && typeof sendPack, abort, earlyDisconnect) |
138 | if (abort || earlyDisconnect) return cb(abort || true) |
139 | // send pack file to client |
140 | if (!sendPack) |
141 | getObjects(commonHash, function (err, numObjects, readObject) { |
142 | sendPack = pack.encode(numObjects, readObject) |
143 | havesDone(abort, cb) |
144 | }) |
145 | else |
146 | sendPack(abort, cb) |
147 | } |
148 | ]) |
149 | } |
150 | |
151 | function packLineEncode(read) { |
152 | var ended |
153 | return function (end, cb) { |
154 | if (ended) return cb(ended) |
155 | read(end, function (end, data) { |
156 | if (ended = end) { |
157 | cb(end) |
158 | } else { |
159 | if (data) |
160 | data += '\n' |
161 | else |
162 | data = '' |
163 | var len = data ? data.length + 4 : 0 |
164 | var hexLen = ('000' + len.toString(16)).substr(-4) |
165 | var pkt = hexLen + data |
166 | // console.error('>', JSON.stringify(pkt)) |
167 | cb(end, pkt) |
168 | } |
169 | }) |
170 | } |
171 | } |
172 | |
173 | function rev(str) { |
174 | return str === '0000000000000000000000000000000000000000' ? null : str |
175 | } |
176 | |
177 | /* pull-stream/source.js */ |
178 | function abortCb(cb, abort, onAbort) { |
179 | cb(abort) |
180 | onAbort && onAbort(abort === true ? null: abort) |
181 | return |
182 | } |
183 | |
184 | function packLineDecode(read, options) { |
185 | var b = buffered(read) |
186 | var readPrefix = b.chunks(4) |
187 | var ended |
188 | |
189 | function readPackLine(abort, cb) { |
190 | if (ended) return cb(ended) |
191 | readPrefix(abort, function (end, buf) { |
192 | if (ended = end) return cb(end) |
193 | var len = parseInt(buf, 16) |
194 | if (!len) |
195 | return cb(null, new Buffer('')) |
196 | // TODO: figure out this -4 thing |
197 | b.chunks(len - 4)(null, function (end, buf) { |
198 | if (ended = end) return cb(end) |
199 | cb(end, buf) |
200 | }) |
201 | }) |
202 | } |
203 | |
204 | function readPackLineStr(abort, cb) { |
205 | if (ended) return cb(ended) |
206 | readPackLine(abort, function (end, buf) { |
207 | if (ended = end) return cb(end) |
208 | // trim newline |
209 | var len = buf.length |
210 | if (buf[len - 1] == 0xa) |
211 | len-- |
212 | var line = buf.toString('ascii', 0, len) |
213 | cb(null, line) |
214 | }) |
215 | } |
216 | |
217 | function readUpdate(abort, cb) { |
218 | readPackLine(abort, function (end, line) { |
219 | if (end) return cb(end) |
220 | if (options.verbosity >= 2) |
221 | console.error('line', line.toString('ascii')) |
222 | if (!line.length) return cb(true) |
223 | var args = split3(line.toString('ascii')) |
224 | var args2 = split2(args[2], '\0') |
225 | var caps = args2[1] |
226 | if (caps && options.verbosity >= 2) |
227 | console.error('update capabilities:', caps) |
228 | cb(null, { |
229 | old: rev(args[0]), |
230 | new: rev(args[1]), |
231 | name: args2[0] |
232 | }) |
233 | }) |
234 | } |
235 | |
236 | function havesWants(onEnd) { |
237 | return function readWant(abort, cb) { |
238 | readPackLineStr(abort, function (end, line) { |
239 | if (end) return abortCb(cb, end, onEnd) |
240 | if (options.verbosity >= 2) |
241 | console.error('line', line) |
242 | // if (!line.length) return cb(true) |
243 | if (!line.length || line == 'done') |
244 | return abortCb(cb, true, onEnd) |
245 | var args = split3(line) |
246 | var caps = args[2] |
247 | if (caps && options.verbosity >= 2) |
248 | console.error('want capabilities:', caps) |
249 | cb(null, { |
250 | type: args[0], |
251 | hash: args[1], |
252 | }) |
253 | }) |
254 | } |
255 | } |
256 | |
257 | /* |
258 | function readWant(abort, cb) { |
259 | readPackLine(abort, function (end, line) { |
260 | if (end) return cb(end) |
261 | if (options.verbosity >= 2) |
262 | console.error('line', line.toString('ascii')) |
263 | if (!line.length || line == 'done') { |
264 | console.error('WANTS done', line, line.length) |
265 | return cb(true) |
266 | } |
267 | var args = split3(line.toString('ascii')) |
268 | var caps = args[2] |
269 | if (caps && options.verbosity >= 2) |
270 | console.error('want capabilities:', caps) |
271 | cb(null, { |
272 | type: args[0], |
273 | hash: args[1].replace(/\n$/, ''), |
274 | }) |
275 | }) |
276 | } |
277 | */ |
278 | |
279 | b.packLines = readPackLine |
280 | b.updates = readUpdate |
281 | b.wants = b.haves = havesWants |
282 | |
283 | return b |
284 | } |
285 | |
286 | // run a callback when a pipeline ends |
287 | // TODO: find a better way to do this |
288 | function onThroughEnd(onEnd) { |
289 | return function (read) { |
290 | return function (end, cb) { |
291 | read(end, function (end, data) { |
292 | cb(end, data) |
293 | if (end) |
294 | onEnd(end === true ? null : end) |
295 | }) |
296 | } |
297 | } |
298 | } |
299 | |
300 | /* |
301 | TODO: investigate capabilities |
302 | report-status delete-refs side-band-64k quiet atomic ofs-delta |
303 | */ |
304 | |
305 | // Get a line for each ref that we have. The first line also has capabilities. |
306 | // Wrap with packLineEncode. |
307 | function receivePackHeader(capabilities, refSource, usePlaceholder) { |
308 | var first = true |
309 | var ended |
310 | return function (abort, cb) { |
311 | if (ended) return cb(true) |
312 | refSource(abort, function (end, ref) { |
313 | ended = end |
314 | var name = ref && ref.name |
315 | var value = ref && ref.value |
316 | if (first && usePlaceholder) { |
317 | first = false |
318 | if (end) { |
319 | // use placeholder data if there are no refs |
320 | value = '0000000000000000000000000000000000000000' |
321 | name = 'capabilities^{}' |
322 | } |
323 | name += '\0' + capabilities.join(' ') |
324 | } else if (end) { |
325 | return cb(true) |
326 | } |
327 | cb(null, value + ' ' + name) |
328 | }) |
329 | } |
330 | } |
331 | |
332 | // receive-pack: push from client |
333 | function receivePack(read, objectSink, refSource, refSink, options) { |
334 | var ended |
335 | var sendRefs = receivePackHeader([ |
336 | 'delete-refs', |
337 | ], refSource, true) |
338 | |
339 | return packLineEncode( |
340 | cat([ |
341 | // send our refs |
342 | sendRefs, |
343 | pull.once(''), |
344 | function (abort, cb) { |
345 | if (abort) return |
346 | // receive their refs |
347 | var lines = packLineDecode(read, options) |
348 | pull( |
349 | lines.updates, |
350 | onThroughEnd(refsDone), |
351 | refSink |
352 | ) |
353 | function refsDone(err) { |
354 | if (err) return cb(err) |
355 | pull( |
356 | lines.passthrough, |
357 | pack.decode(cb), |
358 | objectSink |
359 | ) |
360 | } |
361 | }, |
362 | pull.once('unpack ok') |
363 | ]) |
364 | ) |
365 | } |
366 | |
367 | function prepend(data, read) { |
368 | var done |
369 | return function (end, cb) { |
370 | if (done) { |
371 | read(end, cb) |
372 | } else { |
373 | done = true |
374 | cb(null, data) |
375 | } |
376 | } |
377 | } |
378 | |
379 | module.exports = function (opts) { |
380 | var ended |
381 | var objectSink = opts.objectSink |
382 | var getObjects = opts.getObjects || function (id, cb) { |
383 | cb(null, 0, pull.empty()) |
384 | } |
385 | var refSource = opts.refSource || pull.empty() |
386 | var refSink = opts.refSink || pull.drain() |
387 | var wantSink = opts.wantSink || pull.drain() |
388 | |
389 | var options = { |
390 | verbosity: 1, |
391 | progress: false |
392 | } |
393 | |
394 | function handleConnect(cmd, read) { |
395 | var args = split2(cmd) |
396 | switch (args[0]) { |
397 | case 'git-upload-pack': |
398 | return prepend('\n', uploadPack(read, getObjects, refSource, |
399 | wantSink, options)) |
400 | case 'git-receive-pack': |
401 | return prepend('\n', receivePack(read, objectSink, refSource, |
402 | refSink, options)) |
403 | default: |
404 | return pull.error(new Error('Unknown service ' + args[0])) |
405 | } |
406 | } |
407 | |
408 | function handleCommand(line, read) { |
409 | var args = split2(line) |
410 | switch (args[0]) { |
411 | case 'capabilities': |
412 | return capabilitiesSource() |
413 | case 'list': |
414 | return listRefs(refSource) |
415 | case 'connect': |
416 | return handleConnect(args[1], read) |
417 | case 'option': |
418 | return optionSource(args[1], options) |
419 | default: |
420 | return pull.error(new Error('Unknown command ' + line)) |
421 | } |
422 | } |
423 | |
424 | return function (read) { |
425 | var b = buffered() |
426 | b(read) |
427 | var command |
428 | |
429 | function getCommand(cb) { |
430 | b.lines(null, function next(end, line) { |
431 | if (ended = end) |
432 | return cb(end) |
433 | |
434 | if (line == '') |
435 | return b.lines(null, next) |
436 | |
437 | if (options.verbosity > 1) |
438 | console.error('command:', line) |
439 | |
440 | var cmdSource = handleCommand(line, b.passthrough) |
441 | cb(null, cmdSource) |
442 | }) |
443 | } |
444 | |
445 | return function next(abort, cb) { |
446 | if (ended) return cb(ended) |
447 | |
448 | if (!command) { |
449 | if (abort) return |
450 | getCommand(function (end, cmd) { |
451 | command = cmd |
452 | next(end, cb) |
453 | }) |
454 | return |
455 | } |
456 | |
457 | command(abort, function (err, data) { |
458 | if (err) { |
459 | command = null |
460 | if (err !== true) |
461 | cb(err, data) |
462 | else |
463 | next(abort, cb) |
464 | } else { |
465 | cb(null, data) |
466 | } |
467 | }) |
468 | } |
469 | } |
470 | } |
471 |
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