GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/fetch.cc
Date: 2025-08-31 02:39:21
Exec Total Coverage
Lines: 155 157 98.7%
Branches: 101 173 58.4%
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 "interrupt.h"
14 #include "network/download.h"
15 #include "quota.h"
16 #include "statistics.h"
17 #include "util/concurrency.h"
18 #include "util/logging.h"
19 #include "util/posix.h"
20
21 using namespace std; // NOLINT
22
23 namespace cvmfs {
24
25 6 void TLSDestructor(void *data) {
26 6 Fetcher::ThreadLocalStorage *tls = static_cast<Fetcher::ThreadLocalStorage *>(
27 data);
28 6 std::vector<Fetcher::ThreadLocalStorage *> *tls_blocks = &tls->fetcher
29 ->tls_blocks_;
30
31 {
32 6 const MutexLockGuard m(tls->fetcher->lock_tls_blocks_);
33 6 for (vector<Fetcher::ThreadLocalStorage *>::iterator
34 6 i = tls_blocks->begin(),
35 6 iEnd = tls_blocks->end();
36
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 12 i != iEnd;
37 6 ++i) {
38
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 12 if ((*i) == tls) {
39
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 6 tls_blocks->erase(i);
40 6 break;
41 }
42 }
43 6 }
44 6 tls->fetcher->CleanupTls(tls);
45 6 }
46
47
48 /**
49 * Called when a thread exists, releases a ThreadLocalStorage object and
50 * removes the pointer to it from tls_blocks_.
51 */
52 394 void Fetcher::CleanupTls(ThreadLocalStorage *tls) {
53 394 ClosePipe(tls->pipe_wait);
54
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 394 delete tls;
55 394 }
56
57
58 /**
59 * Initialized thread-local storage if called the first time in a new thread.
60 */
61 696 Fetcher::ThreadLocalStorage *Fetcher::GetTls() {
62 ThreadLocalStorage *tls = static_cast<ThreadLocalStorage *>(
63 696 pthread_getspecific(thread_local_storage_));
64
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 696 if (tls != NULL)
65 302 return tls;
66
67
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 394 tls = new ThreadLocalStorage();
68 394 tls->fetcher = this;
69
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 394 MakePipe(tls->pipe_wait);
70 394 tls->download_job.SetCompressed(true);
71 394 tls->download_job.SetProbeHosts(true);
72 394 const int retval = pthread_setspecific(thread_local_storage_, tls);
73
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 394 assert(retval == 0);
74
75 394 const MutexLockGuard m(lock_tls_blocks_);
76
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 394 tls_blocks_.push_back(tls);
77
78 394 return tls;
79 394 }
80
81
82 957 int Fetcher::Fetch(const CacheManager::LabeledObject &object,
83 const std::string &alt_url) {
84 int fd_return; // Read-only file descriptor that is returned
85 int retval;
86
87 957 perf::Inc(n_invocations);
88
89 // Try to open from local cache
90
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 957 if ((fd_return = OpenSelect(object)) >= 0) {
91
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 291 LogCvmfs(kLogCache, kLogDebug, "hit: %s", object.label.path.c_str());
92 291 return fd_return;
93 }
94
95
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 666 if (object.id.IsNull()) {
96 // This has been seen when trying to load the root catalog signed by an
97 // invalid certificate on an empty cache
98 // TODO(jblomer): check if still necessary after the catalog reload refactor
99 ✗ LogCvmfs(kLogCache, kLogDebug, "cancel attempt to download null hash");
100 ✗ return -EIO;
101 }
102
103
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 666 ThreadLocalStorage *tls = GetTls();
104
105 // Synchronization point: either act as a master thread for this object or
106 // enqueue to the list of waiting threads.
107 666 pthread_mutex_lock(lock_queues_download_);
108 666 const ThreadQueues::iterator iDownloadQueue = queues_download_.find(
109
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 666 object.id);
110
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 666 if (iDownloadQueue != queues_download_.end()) {
111
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 3 LogCvmfs(kLogCache, kLogDebug, "waiting for download of %s",
112 object.label.path.c_str());
113
114
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 3 iDownloadQueue->second->push_back(tls->pipe_wait[1]);
115 3 pthread_mutex_unlock(lock_queues_download_);
116
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 3 ReadPipe(tls->pipe_wait[0], &fd_return, sizeof(int));
117
118
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 3 LogCvmfs(kLogCache, kLogDebug, "received from another thread fd %d for %s",
119 fd_return, object.label.path.c_str());
120 3 return fd_return;
121 } else {
122 // Seems we are the first one, check again in the cache (race condition)
123
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 663 fd_return = OpenSelect(object);
124
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 663 if (fd_return >= 0) {
125 3 pthread_mutex_unlock(lock_queues_download_);
126 3 return fd_return;
127 }
128
129 // Create a new queue for this chunk
130
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 660 queues_download_[object.id] = &tls->other_pipes_waiting;
131 660 pthread_mutex_unlock(lock_queues_download_);
132 }
133
134 660 perf::Inc(n_downloads);
135
136 // Involve the download manager
137
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 660 LogCvmfs(kLogCache, kLogDebug, "downloading %s", object.label.path.c_str());
138 660 std::string url;
139
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 660 if (object.label.IsExternal()) {
140
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 9 url = !alt_url.empty() ? alt_url : object.label.path;
141 } else {
142
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 651 url = "/" + (alt_url.size() ? alt_url : "data/" + object.id.MakePath());
143 }
144
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 660 void *txn = alloca(cache_mgr_->SizeOfTxn());
145
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 660 retval = cache_mgr_->StartTxn(object.id, object.label.size, txn);
146
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 660 if (retval < 0) {
147
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 3 LogCvmfs(kLogCache, kLogDebug, "could not start transaction on %s",
148 object.label.path.c_str());
149
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 3 SignalWaitingThreads(retval, object.id, tls);
150 3 return retval;
151 }
152
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 657 cache_mgr_->CtrlTxn(object.label, 0, txn);
153
154
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 657 LogCvmfs(kLogCache, kLogDebug, "miss: %s %s", object.label.path.c_str(),
155 url.c_str());
156 657 TransactionSink sink(cache_mgr_, txn);
157 657 tls->download_job.SetUrl(&url);
158 657 tls->download_job.SetSink(&sink);
159 657 tls->download_job.SetExpectedHash(&object.id);
160 657 tls->download_job.SetExtraInfo(&object.label.path);
161
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 657 ClientCtx *ctx = ClientCtx::GetInstance();
162
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 657 if (ctx->IsSet()) {
163
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 148 ctx->Get(tls->download_job.GetUidPtr(),
164 tls->download_job.GetGidPtr(),
165 tls->download_job.GetPidPtr(),
166 tls->download_job.GetInterruptCuePtr());
167 } else {
168 509 *(tls->download_job.GetUidPtr()) = -1;
169 509 *(tls->download_job.GetGidPtr()) = -1;
170 509 *(tls->download_job.GetPidPtr()) = -1;
171 509 *(tls->download_job.GetInterruptCuePtr()) = NULL;
172 }
173 657 tls->download_job.SetCompressed(object.label.zip_algorithm
174 == zlib::kZlibDefault);
175 657 tls->download_job.SetRangeOffset(object.label.range_offset);
176 657 tls->download_job.SetRangeSize(static_cast<int64_t>(object.label.size));
177
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 657 download_mgr_->Fetch(&tls->download_job);
178
179
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 657 if (tls->download_job.error_code() == download::kFailOk) {
180
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 609 LogCvmfs(kLogCache, kLogDebug, "finished downloading of %s", url.c_str());
181
182
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 609 fd_return = cache_mgr_->OpenFromTxn(txn);
183
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 609 if (fd_return < 0) {
184
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 3 cache_mgr_->AbortTxn(txn);
185
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 3 SignalWaitingThreads(fd_return, object.id, tls);
186 3 return fd_return;
187 }
188
189
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 606 retval = cache_mgr_->CommitTxn(txn);
190
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 606 if (retval < 0) {
191
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 6 cache_mgr_->Close(fd_return);
192
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 6 SignalWaitingThreads(retval, object.id, tls);
193 6 return retval;
194 }
195
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 600 SignalWaitingThreads(fd_return, object.id, tls);
196 600 return fd_return;
197 }
198
199 // Download failed
200
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 96 LogCvmfs(kLogCache, kLogDebug | kLogSyslogErr,
201 "failed to fetch %s (hash: %s, error %d [%s])",
202
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 96 object.label.path.c_str(), object.id.ToString().c_str(),
203 48 tls->download_job.error_code(),
204 download::Code2Ascii(tls->download_job.error_code()));
205
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 48 cache_mgr_->AbortTxn(txn);
206
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 48 backoff_throttle_->Throttle();
207
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 48 SignalWaitingThreads(-EIO, object.id, tls);
208 48 return -EIO;
209 660 }
210
211
212 984 Fetcher::Fetcher(CacheManager *cache_mgr,
213 download::DownloadManager *download_mgr,
214 BackoffThrottle *backoff_throttle,
215 984 perf::StatisticsTemplate statistics)
216 984 : lock_queues_download_(NULL)
217 984 , lock_tls_blocks_(NULL)
218 984 , cache_mgr_(cache_mgr)
219 984 , download_mgr_(download_mgr)
220 984 , backoff_throttle_(backoff_throttle) {
221 int retval;
222 984 retval = pthread_key_create(&thread_local_storage_, TLSDestructor);
223
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 984 assert(retval == 0);
224 984 lock_queues_download_ = reinterpret_cast<pthread_mutex_t *>(
225 984 smalloc(sizeof(pthread_mutex_t)));
226 984 retval = pthread_mutex_init(lock_queues_download_, NULL);
227
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 984 assert(retval == 0);
228 984 lock_tls_blocks_ = reinterpret_cast<pthread_mutex_t *>(
229 984 smalloc(sizeof(pthread_mutex_t)));
230 984 retval = pthread_mutex_init(lock_tls_blocks_, NULL);
231
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 984 assert(retval == 0);
232
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 984 n_downloads = statistics.RegisterTemplated(
233 "n_downloads",
234 "overall number of downloaded files (incl. catalogs, chunks)");
235
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 984 n_invocations = statistics.RegisterTemplated(
236 "n_invocations",
237 "overall number of object requests (incl. catalogs, chunks)");
238 984 }
239
240
241 984 Fetcher::~Fetcher() {
242 int retval;
243
244 {
245 984 const MutexLockGuard m(lock_tls_blocks_);
246
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 1372 for (unsigned i = 0; i < tls_blocks_.size(); ++i)
247 388 CleanupTls(tls_blocks_[i]);
248 984 }
249
250 984 retval = pthread_mutex_destroy(lock_tls_blocks_);
251
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 984 assert(retval == 0);
252 984 free(lock_tls_blocks_);
253
254 984 retval = pthread_mutex_destroy(lock_queues_download_);
255
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 984 assert(retval == 0);
256 984 free(lock_queues_download_);
257
258 984 retval = pthread_key_delete(thread_local_storage_);
259
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 984 assert(retval == 0);
260 984 }
261
262
263 /**
264 * Depending on the object type, uses either Open() or OpenPinned() from the
265 * cache manager
266 */
267 1620 int Fetcher::OpenSelect(const CacheManager::LabeledObject &object) {
268
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 1620 if (object.label.IsCatalog() || object.label.IsPinned()) {
269 1536 return cache_mgr_->OpenPinned(object);
270 } else {
271 84 return cache_mgr_->Open(object);
272 }
273 }
274
275
276 669 void Fetcher::SignalWaitingThreads(const int fd,
277 const shash::Any &id,
278 ThreadLocalStorage *tls) {
279 669 const MutexLockGuard m(lock_queues_download_);
280
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 681 for (unsigned i = 0, s = tls->other_pipes_waiting.size(); i < s; ++i) {
281
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 12 int fd_dup = (fd >= 0) ? cache_mgr_->Dup(fd) : fd;
282
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 12 WritePipe(tls->other_pipes_waiting[i], &fd_dup, sizeof(int));
283 }
284 669 tls->other_pipes_waiting.clear();
285
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 669 queues_download_.erase(id);
286 669 }
287
288 } // namespace cvmfs
289