about summary refs log tree commit diff
path: root/src/libstore/binary-cache-store.cc
blob: 11fa3cae27a583588a2f77519318ece2d9d94ebc (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
#include "archive.hh"
#include "binary-cache-store.hh"
#include "compression.hh"
#include "derivations.hh"
#include "fs-accessor.hh"
#include "globals.hh"
#include "nar-info.hh"
#include "sync.hh"
#include "remote-fs-accessor.hh"
#include "nar-info-disk-cache.hh"
#include "nar-accessor.hh"
#include "json.hh"

#include <chrono>

#include <future>

namespace nix {

BinaryCacheStore::BinaryCacheStore(const Params & params)
    : Store(params)
{
    if (secretKeyFile != "")
        secretKey = std::unique_ptr<SecretKey>(new SecretKey(readFile(secretKeyFile)));

    StringSink sink;
    sink << narVersionMagic1;
    narMagic = *sink.s;
}

void BinaryCacheStore::init()
{
    std::string cacheInfoFile = "nix-cache-info";

    auto cacheInfo = getFile(cacheInfoFile);
    if (!cacheInfo) {
        upsertFile(cacheInfoFile, "StoreDir: " + storeDir + "\n", "text/x-nix-cache-info");
    } else {
        for (auto & line : tokenizeString<Strings>(*cacheInfo, "\n")) {
            size_t colon = line.find(':');
            if (colon == std::string::npos) continue;
            auto name = line.substr(0, colon);
            auto value = trim(line.substr(colon + 1, std::string::npos));
            if (name == "StoreDir") {
                if (value != storeDir)
                    throw Error(format("binary cache '%s' is for Nix stores with prefix '%s', not '%s'")
                        % getUri() % value % storeDir);
            } else if (name == "WantMassQuery") {
                wantMassQuery_ = value == "1";
            } else if (name == "Priority") {
                string2Int(value, priority);
            }
        }
    }
}

void BinaryCacheStore::getFile(const std::string & path,
    Callback<std::shared_ptr<std::string>> callback)
{
    try {
        callback(getFile(path));
    } catch (...) { callback.rethrow(); }
}

void BinaryCacheStore::getFile(const std::string & path, Sink & sink)
{
    std::promise<std::shared_ptr<std::string>> promise;
    getFile(path,
        {[&](std::future<std::shared_ptr<std::string>> result) {
            try {
                promise.set_value(result.get());
            } catch (...) {
                promise.set_exception(std::current_exception());
            }
        }});
    auto data = promise.get_future().get();
    sink((unsigned char *) data->data(), data->size());
}

std::shared_ptr<std::string> BinaryCacheStore::getFile(const std::string & path)
{
    StringSink sink;
    try {
        getFile(path, sink);
    } catch (NoSuchBinaryCacheFile &) {
        return nullptr;
    }
    return sink.s;
}

Path BinaryCacheStore::narInfoFileFor(const Path & storePath)
{
    assertStorePath(storePath);
    return storePathToHash(storePath) + ".narinfo";
}

void BinaryCacheStore::writeNarInfo(ref<NarInfo> narInfo)
{
    auto narInfoFile = narInfoFileFor(narInfo->path);

    upsertFile(narInfoFile, narInfo->to_string(), "text/x-nix-narinfo");

    auto hashPart = storePathToHash(narInfo->path);

    {
        auto state_(state.lock());
        state_->pathInfoCache.upsert(hashPart, std::shared_ptr<NarInfo>(narInfo));
    }

    if (diskCache)
        diskCache->upsertNarInfo(getUri(), hashPart, std::shared_ptr<NarInfo>(narInfo));
}

void BinaryCacheStore::addToStore(const ValidPathInfo & info, const ref<std::string> & nar,
    RepairFlag repair, CheckSigsFlag checkSigs, std::shared_ptr<FSAccessor> accessor)
{
    if (!repair && isValidPath(info.path)) return;

    /* Verify that all references are valid. This may do some .narinfo
       reads, but typically they'll already be cached. */
    for (auto & ref : info.references)
        try {
            if (ref != info.path)
                queryPathInfo(ref);
        } catch (InvalidPath &) {
            throw Error(format("cannot add '%s' to the binary cache because the reference '%s' is not valid")
                % info.path % ref);
        }

    assert(nar->compare(0, narMagic.size(), narMagic) == 0);

    auto narInfo = make_ref<NarInfo>(info);

    narInfo->narSize = nar->size();
    narInfo->narHash = hashString(htSHA256, *nar);

    if (info.narHash && info.narHash != narInfo->narHash)
        throw Error(format("refusing to copy corrupted path '%1%' to binary cache") % info.path);

    auto accessor_ = std::dynamic_pointer_cast<RemoteFSAccessor>(accessor);

    /* Optionally write a JSON file containing a listing of the
       contents of the NAR. */
    if (writeNARListing) {
        std::ostringstream jsonOut;

        {
            JSONObject jsonRoot(jsonOut);
            jsonRoot.attr("version", 1);

            auto narAccessor = makeNarAccessor(nar);

            if (accessor_)
                accessor_->addToCache(info.path, *nar, narAccessor);

            {
                auto res = jsonRoot.placeholder("root");
                listNar(res, narAccessor, "", true);
            }
        }

        upsertFile(storePathToHash(info.path) + ".ls", jsonOut.str(), "application/json");
    }

    else {
        if (accessor_)
            accessor_->addToCache(info.path, *nar, makeNarAccessor(nar));
    }

    /* Compress the NAR. */
    narInfo->compression = compression;
    auto now1 = std::chrono::steady_clock::now();
    auto narCompressed = compress(compression, *nar, parallelCompression);
    auto now2 = std::chrono::steady_clock::now();
    narInfo->fileHash = hashString(htSHA256, *narCompressed);
    narInfo->fileSize = narCompressed->size();

    auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(now2 - now1).count();
    printMsg(lvlTalkative, format("copying path '%1%' (%2% bytes, compressed %3$.1f%% in %4% ms) to binary cache")
        % narInfo->path % narInfo->narSize
        % ((1.0 - (double) narCompressed->size() / nar->size()) * 100.0)
        % duration);

    /* Atomically write the NAR file. */
    narInfo->url = "nar/" + narInfo->fileHash.to_string(Base32, false) + ".nar"
        + (compression == "xz" ? ".xz" :
           compression == "bzip2" ? ".bz2" :
           compression == "br" ? ".br" :
           "");
    if (repair || !fileExists(narInfo->url)) {
        stats.narWrite++;
        upsertFile(narInfo->url, *narCompressed, "application/x-nix-nar");
    } else
        stats.narWriteAverted++;

    stats.narWriteBytes += nar->size();
    stats.narWriteCompressedBytes += narCompressed->size();
    stats.narWriteCompressionTimeMs += duration;

    /* Atomically write the NAR info file.*/
    if (secretKey) narInfo->sign(*secretKey);

    writeNarInfo(narInfo);

    stats.narInfoWrite++;
}

bool BinaryCacheStore::isValidPathUncached(const Path & storePath)
{
    // FIXME: this only checks whether a .narinfo with a matching hash
    // part exists. So ‘f4kb...-foo’ matches ‘f4kb...-bar’, even
    // though they shouldn't. Not easily fixed.
    return fileExists(narInfoFileFor(storePath));
}

void BinaryCacheStore::narFromPath(const Path & storePath, Sink & sink)
{
    auto info = queryPathInfo(storePath).cast<const NarInfo>();

    auto source = sinkToSource([this, url{info->url}](Sink & sink) {
        getFile(url, sink);
    });

    stats.narRead++;
    //stats.narReadCompressedBytes += nar->size(); // FIXME

    uint64_t narSize = 0;

    LambdaSink wrapperSink([&](const unsigned char * data, size_t len) {
        sink(data, len);
        narSize += len;
    });

    decompress(info->compression, *source, wrapperSink);

    stats.narReadBytes += narSize;
}

void BinaryCacheStore::queryPathInfoUncached(const Path & storePath,
    Callback<std::shared_ptr<ValidPathInfo>> callback)
{
    auto uri = getUri();
    auto act = std::make_shared<Activity>(*logger, lvlTalkative, actQueryPathInfo,
        fmt("querying info about '%s' on '%s'", storePath, uri), Logger::Fields{storePath, uri});
    PushActivity pact(act->id);

    auto narInfoFile = narInfoFileFor(storePath);

    getFile(narInfoFile,
        {[=](std::future<std::shared_ptr<std::string>> fut) {
            try {
                auto data = fut.get();

                if (!data) return callback(nullptr);

                stats.narInfoRead++;

                callback((std::shared_ptr<ValidPathInfo>)
                    std::make_shared<NarInfo>(*this, *data, narInfoFile));

                (void) act; // force Activity into this lambda to ensure it stays alive
            } catch (...) {
                callback.rethrow();
            }
        }});
}

Path BinaryCacheStore::addToStore(const string & name, const Path & srcPath,
    bool recursive, HashType hashAlgo, PathFilter & filter, RepairFlag repair)
{
    // FIXME: some cut&paste from LocalStore::addToStore().

    /* Read the whole path into memory. This is not a very scalable
       method for very large paths, but `copyPath' is mainly used for
       small files. */
    StringSink sink;
    Hash h;
    if (recursive) {
        dumpPath(srcPath, sink, filter);
        h = hashString(hashAlgo, *sink.s);
    } else {
        auto s = readFile(srcPath);
        dumpString(s, sink);
        h = hashString(hashAlgo, s);
    }

    ValidPathInfo info;
    info.path = makeFixedOutputPath(recursive, h, name);

    addToStore(info, sink.s, repair, CheckSigs, nullptr);

    return info.path;
}

Path BinaryCacheStore::addTextToStore(const string & name, const string & s,
    const PathSet & references, RepairFlag repair)
{
    ValidPathInfo info;
    info.path = computeStorePathForText(name, s, references);
    info.references = references;

    if (repair || !isValidPath(info.path)) {
        StringSink sink;
        dumpString(s, sink);
        addToStore(info, sink.s, repair, CheckSigs, nullptr);
    }

    return info.path;
}

ref<FSAccessor> BinaryCacheStore::getFSAccessor()
{
    return make_ref<RemoteFSAccessor>(ref<Store>(shared_from_this()), localNarCache);
}

void BinaryCacheStore::addSignatures(const Path & storePath, const StringSet & sigs)
{
    /* Note: this is inherently racy since there is no locking on
       binary caches. In particular, with S3 this unreliable, even
       when addSignatures() is called sequentially on a path, because
       S3 might return an outdated cached version. */

    auto narInfo = make_ref<NarInfo>((NarInfo &) *queryPathInfo(storePath));

    narInfo->sigs.insert(sigs.begin(), sigs.end());

    auto narInfoFile = narInfoFileFor(narInfo->path);

    writeNarInfo(narInfo);
}

std::shared_ptr<std::string> BinaryCacheStore::getBuildLog(const Path & path)
{
    Path drvPath;

    if (isDerivation(path))
        drvPath = path;
    else {
        try {
            auto info = queryPathInfo(path);
            // FIXME: add a "Log" field to .narinfo
            if (info->deriver == "") return nullptr;
            drvPath = info->deriver;
        } catch (InvalidPath &) {
            return nullptr;
        }
    }

    auto logPath = "log/" + baseNameOf(drvPath);

    debug("fetching build log from binary cache '%s/%s'", getUri(), logPath);

    return getFile(logPath);
}

}