GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/fetch.cc
Date: 2026-10-11 02:40:02
Exec Total Coverage
Lines: 158 168 94.0%
Branches: 105 195 53.8%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5
6 #include "fetch.h"
7
8 #include <unistd.h>
9
10 #include "backoff.h"
11 #include "cache.h"
12 #include "clientctx.h"
13 #include "network/download.h"
14 #include "quota.h"
15 #include "statistics.h"
16 #include "util/logging.h"
17 #include "util/posix.h"
18
19 using namespace std; // NOLINT
20
21 namespace cvmfs {
22
23 38 void TLSDestructor(void *data) {
24 38 Fetcher::ThreadLocalStorage *tls = static_cast<Fetcher::ThreadLocalStorage *>(
25 data);
26 38 std::vector<Fetcher::ThreadLocalStorage *> *tls_blocks = &tls->fetcher
27 ->tls_blocks_;
28
29 {
30 38 const MutexLockGuard m(tls->fetcher->lock_tls_blocks_);
31 38 for (vector<Fetcher::ThreadLocalStorage *>::iterator
32 38 i = tls_blocks->begin(),
33 38 iEnd = tls_blocks->end();
34
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 76 i != iEnd;
35 38 ++i) {
36
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 76 if ((*i) == tls) {
37
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 38 tls_blocks->erase(i);
38 38 break;
39 }
40 }
41 38 }
42 38 tls->fetcher->CleanupTls(tls);
43 38 }
44
45
46 /**
47 * Called when a thread exists, releases a ThreadLocalStorage object and
48 * removes the pointer to it from tls_blocks_.
49 */
50 637 void Fetcher::CleanupTls(ThreadLocalStorage *tls) {
51 637 ClosePipe(tls->pipe_wait);
52
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 637 delete tls;
53 637 }
54
55
56 /**
57 * Initialized thread-local storage if called the first time in a new thread.
58 */
59 992 Fetcher::ThreadLocalStorage *Fetcher::GetTls() {
60 ThreadLocalStorage *tls = static_cast<ThreadLocalStorage *>(
61 992 pthread_getspecific(thread_local_storage_));
62
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 992 if (tls != NULL)
63 355 return tls;
64
65
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 637 tls = new ThreadLocalStorage();
66 637 tls->fetcher = this;
67
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 637 MakePipe(tls->pipe_wait);
68 637 tls->download_job.SetCompressed(true);
69 637 tls->download_job.SetProbeHosts(true);
70 637 const int retval = pthread_setspecific(thread_local_storage_, tls);
71
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 637 assert(retval == 0);
72
73 637 const MutexLockGuard m(lock_tls_blocks_);
74
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 637 tls_blocks_.push_back(tls);
75
76 637 return tls;
77 637 }
78
79
80 1294 int Fetcher::Fetch(const CacheManager::LabeledObject &object,
81 const std::string &alt_url) {
82 int fd_return; // Read-only file descriptor that is returned
83 int retval;
84
85 1294 perf::Inc(n_invocations);
86
87 // Try to open from local cache
88
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 1294 if ((fd_return = OpenSelect(object)) >= 0) {
89
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 492 LogCvmfs(kLogCache, kLogDebug, "hit: %s", object.label.path.c_str());
90 492 return fd_return;
91 }
92
93
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 802 if (object.id.IsNull()) {
94 // This has been seen when trying to load the root catalog signed by an
95 // invalid certificate on an empty cache
96 // TODO(jblomer): check if still necessary after the catalog reload refactor
97 ✗ LogCvmfs(kLogCache, kLogDebug, "cancel attempt to download null hash");
98 ✗ return -EIO;
99 }
100
101
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 802 ThreadLocalStorage *tls = GetTls();
102
103 // Synchronization point: either act as a master thread for this object or
104 // enqueue to the list of waiting threads.
105 802 pthread_mutex_lock(lock_queues_download_);
106 802 const ThreadQueues::iterator iDownloadQueue = queues_download_.find(
107
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 802 object.id);
108
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 802 if (iDownloadQueue != queues_download_.end()) {
109
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 19 LogCvmfs(kLogCache, kLogDebug, "waiting for download of %s",
110 object.label.path.c_str());
111
112
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 19 iDownloadQueue->second->push_back(tls->pipe_wait[1]);
113 19 pthread_mutex_unlock(lock_queues_download_);
114
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 19 ReadPipe(tls->pipe_wait[0], &fd_return, sizeof(int));
115
116
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 19 LogCvmfs(kLogCache, kLogDebug, "received from another thread fd %d for %s",
117 fd_return, object.label.path.c_str());
118 19 return fd_return;
119 } else {
120 // Seems we are the first one, check again in the cache (race condition)
121
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 783 fd_return = OpenSelect(object);
122
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 783 if (fd_return >= 0) {
123 19 pthread_mutex_unlock(lock_queues_download_);
124 19 return fd_return;
125 }
126
127 // Create a new queue for this chunk
128
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 764 queues_download_[object.id] = &tls->other_pipes_waiting;
129 764 pthread_mutex_unlock(lock_queues_download_);
130 }
131
132 764 perf::Inc(n_downloads);
133
134 // Involve the download manager
135
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 764 LogCvmfs(kLogCache, kLogDebug, "downloading %s", object.label.path.c_str());
136 764 std::string url;
137
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 764 if (object.label.IsExternal()) {
138
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 57 url = !alt_url.empty() ? alt_url : object.label.path;
139 } else {
140
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 707 url = "/" + (alt_url.size() ? alt_url : "data/" + object.id.MakePath());
141 }
142
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 764 void *txn = alloca(cache_mgr_->SizeOfTxn());
143
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 764 retval = cache_mgr_->StartTxn(object.id, object.label.size, txn);
144
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 764 if (retval < 0) {
145
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 19 LogCvmfs(kLogCache, kLogDebug, "could not start transaction on %s",
146 object.label.path.c_str());
147
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 19 SignalWaitingThreads(retval, object.id, tls);
148 19 return retval;
149 }
150
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 745 cache_mgr_->CtrlTxn(object.label, 0, txn);
151
152
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 745 LogCvmfs(kLogCache, kLogDebug, "miss: %s %s", object.label.path.c_str(),
153 url.c_str());
154 745 TransactionSink sink(cache_mgr_, txn);
155 745 tls->download_job.SetUrl(&url);
156 745 tls->download_job.SetSink(&sink);
157 745 tls->download_job.SetExpectedHash(&object.id);
158 745 tls->download_job.SetPathInfo(&object.label.path);
159
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 745 ClientCtx *ctx = ClientCtx::GetInstance();
160
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 745 if (ctx->IsSet()) {
161
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 12 ctx->Get(tls->download_job.GetUidPtr(),
162 tls->download_job.GetGidPtr(),
163 tls->download_job.GetPidPtr(),
164 tls->download_job.GetInterruptCuePtr());
165 } else {
166 733 *(tls->download_job.GetUidPtr()) = -1;
167 733 *(tls->download_job.GetGidPtr()) = -1;
168 733 *(tls->download_job.GetPidPtr()) = -1;
169 733 *(tls->download_job.GetInterruptCuePtr()) = NULL;
170 }
171 745 tls->download_job.SetCompressed(object.label.zip_algorithm
172 == zlib::kZlibDefault);
173 745 tls->download_job.SetRangeOffset(object.label.range_offset);
174 745 tls->download_job.SetRangeSize(static_cast<int64_t>(object.label.size));
175
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 745 download_mgr_->Fetch(&tls->download_job);
176
177 // Partial replica failover: a partial Stratum-1 serves a 404 for objects it
178 // did not replicate. Retry once against the full replica and let the common
179 // success/error paths below handle the result. Only 404 triggers failover:
180 // other HTTP errors (403, 5xx, ...) also map to kFailHostHttp but indicate a
181 // server problem rather than an unreplicated object, so they must not be
182 // masked by silently fetching from elsewhere. The txn buffer is reused in
183 // place by StartTxn, so `sink` keeps pointing at the fresh transaction and
184 // needs no reconstruction.
185 745 if (tls->download_job.error_code() == download::kFailHostHttp
186
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 19 && tls->download_job.http_code() == 404
187
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 764 && full_replica_download_mgr_ != NULL) {
188 ✗ LogCvmfs(kLogCache, kLogDebug | kLogSyslog,
189 "partial replica: %s not available on primary, "
190 "retrying from full replica",
191 object.label.path.c_str());
192 ✗ cache_mgr_->AbortTxn(txn);
193 ✗ retval = cache_mgr_->StartTxn(object.id, object.label.size, txn);
194 ✗ if (retval < 0) {
195 ✗ SignalWaitingThreads(retval, object.id, tls);
196 ✗ return retval;
197 }
198 ✗ cache_mgr_->CtrlTxn(object.label, 0, txn);
199 ✗ full_replica_download_mgr_->Fetch(&tls->download_job);
200 }
201
202
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 745 if (tls->download_job.error_code() == download::kFailOk) {
203
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 650 LogCvmfs(kLogCache, kLogDebug, "finished downloading of %s", url.c_str());
204
205
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 650 fd_return = cache_mgr_->OpenFromTxn(txn);
206
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 650 if (fd_return < 0) {
207
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 19 cache_mgr_->AbortTxn(txn);
208
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 19 SignalWaitingThreads(fd_return, object.id, tls);
209 19 return fd_return;
210 }
211
212
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 631 retval = cache_mgr_->CommitTxn(txn);
213
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 631 if (retval < 0) {
214
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 38 cache_mgr_->Close(fd_return);
215
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 38 SignalWaitingThreads(retval, object.id, tls);
216 38 return retval;
217 }
218
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 593 SignalWaitingThreads(fd_return, object.id, tls);
219 593 return fd_return;
220 }
221
222 // Download failed (primary, and full replica if configured)
223
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 190 LogCvmfs(kLogCache, kLogDebug | kLogSyslogErr,
224 "failed to fetch %s (hash: %s, error %d [%s])",
225
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 190 object.label.path.c_str(), object.id.ToString().c_str(),
226 95 tls->download_job.error_code(),
227 download::Code2Ascii(tls->download_job.error_code()));
228
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 95 cache_mgr_->AbortTxn(txn);
229
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 95 backoff_throttle_->Throttle();
230
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 95 SignalWaitingThreads(-EIO, object.id, tls);
231 95 return -EIO;
232 764 }
233
234
235 2562 Fetcher::Fetcher(CacheManager *cache_mgr,
236 download::DownloadManager *download_mgr,
237 BackoffThrottle *backoff_throttle,
238 2562 perf::StatisticsTemplate statistics)
239 2562 : lock_queues_download_(NULL)
240 2562 , lock_tls_blocks_(NULL)
241 2562 , cache_mgr_(cache_mgr)
242 2562 , download_mgr_(download_mgr)
243 2562 , full_replica_download_mgr_(NULL)
244 2562 , backoff_throttle_(backoff_throttle) {
245 int retval;
246 2562 retval = pthread_key_create(&thread_local_storage_, TLSDestructor);
247
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 2562 assert(retval == 0);
248 2562 lock_queues_download_ = reinterpret_cast<pthread_mutex_t *>(
249 2562 smalloc(sizeof(pthread_mutex_t)));
250 2562 retval = pthread_mutex_init(lock_queues_download_, NULL);
251
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 2562 assert(retval == 0);
252 2562 lock_tls_blocks_ = reinterpret_cast<pthread_mutex_t *>(
253 2562 smalloc(sizeof(pthread_mutex_t)));
254 2562 retval = pthread_mutex_init(lock_tls_blocks_, NULL);
255
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 2562 assert(retval == 0);
256
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 2562 n_downloads = statistics.RegisterTemplated(
257 "n_downloads",
258 "overall number of downloaded files (incl. catalogs, chunks)");
259
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 2562 n_invocations = statistics.RegisterTemplated(
260 "n_invocations",
261 "overall number of object requests (incl. catalogs, chunks)");
262 2562 }
263
264
265 9020 Fetcher::~Fetcher() {
266 int retval;
267
268 {
269 5124 const MutexLockGuard m(lock_tls_blocks_);
270
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 6322 for (unsigned i = 0; i < tls_blocks_.size(); ++i)
271 1198 CleanupTls(tls_blocks_[i]);
272 }
273
274 5124 retval = pthread_mutex_destroy(lock_tls_blocks_);
275
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 5124 assert(retval == 0);
276 5124 free(lock_tls_blocks_);
277
278 5124 retval = pthread_mutex_destroy(lock_queues_download_);
279
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 5124 assert(retval == 0);
280 5124 free(lock_queues_download_);
281
282 5124 retval = pthread_key_delete(thread_local_storage_);
283
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 5124 assert(retval == 0);
284 9020 }
285
286
287 /**
288 * Depending on the object type, uses either Open() or OpenPinned() from the
289 * cache manager
290 */
291 2077 int Fetcher::OpenSelect(const CacheManager::LabeledObject &object) {
292
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 2077 if (object.label.IsCatalog() || object.label.IsPinned()) {
293 1455 return cache_mgr_->OpenPinned(object);
294 } else {
295 622 return cache_mgr_->Open(object);
296 }
297 }
298
299
300 821 void Fetcher::SignalWaitingThreads(const int fd,
301 const shash::Any &id,
302 ThreadLocalStorage *tls) {
303 821 const MutexLockGuard m(lock_queues_download_);
304
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 897 for (unsigned i = 0, s = tls->other_pipes_waiting.size(); i < s; ++i) {
305
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 76 int fd_dup = (fd >= 0) ? cache_mgr_->Dup(fd) : fd;
306
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 76 WritePipe(tls->other_pipes_waiting[i], &fd_dup, sizeof(int));
307 }
308 821 tls->other_pipes_waiting.clear();
309
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 821 queues_download_.erase(id);
310 821 }
311
312 } // namespace cvmfs
313