GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/pack.cc
Date: 2025-12-14 02:35:46
Exec Total Coverage
Lines: 283 307 92.2%
Branches: 202 332 60.8%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5 #include "pack.h"
6
7 #include <algorithm>
8 #include <cassert>
9 #include <cstring>
10 #include <map>
11
12 #include "util/concurrency.h"
13 #include "util/exception.h"
14 #include "util/platform.h"
15 #include "util/smalloc.h"
16 #include "util/string.h"
17
18 using namespace std; // NOLINT
19
20 namespace { // some private utility functions used by ObjectPackProducer
21
22 2328 void InitializeHeader(const int version, const int num_objects,
23 const size_t pack_size, std::string *header) {
24
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 2328 if (header) {
25
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 2328 *header = "V" + StringifyInt(version) + "\n";
26
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 2328 *header += "S" + StringifyInt(pack_size) + "\n";
27
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 2328 *header += "N" + StringifyInt(num_objects) + "\n";
28 2328 *header += "--\n";
29 }
30 2328 }
31
32 201674 void AppendItemToHeader(ObjectPack::BucketContentType object_type,
33 const std::string &hash_str, const size_t object_size,
34 const std::string &object_name, std::string *header) {
35 // If the item type is kName, the "item_name" parameter should not be empty
36
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 201674 assert((object_type == ObjectPack::kCas)
37 || ((object_type == ObjectPack::kNamed) && (!object_name.empty())));
38
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 201674 std::string line_prefix = "";
39
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 201674 std::string line_suffix = "";
40
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 201674 switch (object_type) {
41 87 case ObjectPack::kNamed:
42
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 87 line_prefix = "N ";
43
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 87 line_suffix = std::string(" ") + Base64Url(object_name);
44 87 break;
45 201587 case ObjectPack::kCas:
46
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 201587 line_prefix = "C ";
47 201587 break;
48 ✗ default:
49 ✗ PANIC(kLogStderr, "Unknown object pack type to be added to header.");
50 }
51
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 201674 if (header) {
52
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 403348 *header += line_prefix + hash_str + " " + StringifyInt(object_size)
53
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 201674 + line_suffix + "\n";
54 }
55 201674 }
56
57 } // namespace
58
59 2911545 ObjectPack::Bucket::Bucket()
60 2911545 : content(reinterpret_cast<unsigned char *>(smalloc(kInitialSize)))
61 2911545 , size(0)
62 2911545 , capacity(kInitialSize)
63 2911545 , content_type(kEmpty)
64 5823090 , name() { }
65
66 11226 void ObjectPack::Bucket::Add(const void *buf, const uint64_t buf_size) {
67
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 11226 if (buf_size == 0)
68 ✗ return;
69
70
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 135622 while (size + buf_size > capacity) {
71 124396 capacity *= 2;
72 124396 content = reinterpret_cast<unsigned char *>(srealloc(content, capacity));
73 }
74 11226 memcpy(content + size, buf, buf_size);
75 11226 size += buf_size;
76 }
77
78 2911545 ObjectPack::Bucket::~Bucket() { free(content); }
79
80 //------------------------------------------------------------------------------
81
82 2230 ObjectPack::ObjectPack(const uint64_t limit) : limit_(limit), size_(0) {
83 2230 InitLock();
84 2230 }
85
86 2192 ObjectPack::~ObjectPack() {
87 4384 for (std::set<BucketHandle>::const_iterator i = open_buckets_.begin(),
88 2192 iEnd = open_buckets_.end();
89
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 4106 i != iEnd;
90 1914 ++i) {
91
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 1914 delete *i;
92 }
93
94
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 2911707 for (unsigned i = 0; i < buckets_.size(); ++i)
95
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 2909515 delete buckets_[i];
96 2192 pthread_mutex_destroy(lock_);
97 2192 free(lock_);
98 2192 }
99
100 3164 void ObjectPack::AddToBucket(const void *buf, const uint64_t size,
101 const ObjectPack::BucketHandle handle) {
102 3164 handle->Add(buf, size);
103 3164 }
104
105 2911516 ObjectPack::BucketHandle ObjectPack::NewBucket() {
106
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 2911516 BucketHandle handle = new Bucket();
107
108 2911516 const MutexLockGuard mutex_guard(lock_);
109
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 2911516 open_buckets_.insert(handle);
110 2911516 return handle;
111 2911516 }
112
113 /**
114 * Can only fail due to insufficient remaining space in the ObjectPack.
115 */
116 2912066 bool ObjectPack::CommitBucket(const BucketContentType type,
117 const shash::Any &id,
118 const ObjectPack::BucketHandle handle,
119 const std::string &name) {
120 2912066 handle->id = id;
121
122 2912066 handle->content_type = type;
123
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 2912066 if (type == kNamed) {
124 ✗ handle->name = name;
125 }
126
127 2912066 const MutexLockGuard mutex_guard(lock_);
128
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 2912066 if (buckets_.size() >= kMaxObjects)
129 29 return false;
130
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 2912037 if (size_ + handle->size > limit_)
131 2522 return false;
132
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 2909515 open_buckets_.erase(handle);
133
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 2909515 buckets_.push_back(handle);
134 2909515 size_ += handle->size;
135 2909515 return true;
136 2912066 }
137
138 87 void ObjectPack::DiscardBucket(const BucketHandle handle) {
139 87 const MutexLockGuard mutex_guard(lock_);
140
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 87 open_buckets_.erase(handle);
141
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 87 delete handle;
142 87 }
143
144 2230 void ObjectPack::InitLock() {
145 2230 lock_ = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
146 2230 const int retval = pthread_mutex_init(lock_, NULL);
147
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 2230 assert(retval == 0);
148 2230 }
149
150 /**
151 * If a commit failed, an open Bucket can be transferred to another ObjectPack
152 * with more space.
153 */
154 865 void ObjectPack::TransferBucket(const ObjectPack::BucketHandle handle,
155 ObjectPack *other) {
156 865 const MutexLockGuard mutex_guard(lock_);
157
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 865 open_buckets_.erase(handle);
158
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 865 other->open_buckets_.insert(handle);
159 865 }
160
161 1102420 unsigned char *ObjectPack::BucketContent(size_t idx) const {
162
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 1102420 assert(idx < buckets_.size());
163 1102420 return buckets_[idx]->content;
164 }
165
166 1304007 uint64_t ObjectPack::BucketSize(size_t idx) const {
167
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 1304007 assert(idx < buckets_.size());
168 1304007 return buckets_[idx]->size;
169 }
170
171 201587 const shash::Any &ObjectPack::BucketId(size_t idx) const {
172
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 201587 assert(idx < buckets_.size());
173 201587 return buckets_[idx]->id;
174 }
175
176 //------------------------------------------------------------------------------
177
178 /**
179 * Hash over the header. The hash algorithm needs to be provided by hash.
180 */
181 2107 void ObjectPackProducer::GetDigest(shash::Any *hash) {
182
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 2107 assert(hash);
183 2107 shash::HashString(header_, hash);
184 2107 }
185
186 2241 ObjectPackProducer::ObjectPackProducer(ObjectPack *pack)
187 2241 : pack_(pack), big_file_(NULL), pos_(0), idx_(0), pos_in_bucket_(0) {
188 2241 const unsigned N = pack->GetNoObjects();
189 // rough guess, most likely a little too much
190
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 2241 header_.reserve(30 + N * (2 * shash::kMaxDigestSize + 5));
191
192
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 2241 InitializeHeader(2, N, pack->size(), &header_);
193
194
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 203828 for (unsigned i = 0; i < N; ++i) {
195
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 201587 AppendItemToHeader(ObjectPack::kCas, pack->BucketId(i).ToString(true),
196 pack->BucketSize(i), "", &header_);
197 }
198 2241 }
199
200 87 ObjectPackProducer::ObjectPackProducer(const shash::Any &id, FILE *big_file,
201 87 const std::string &file_name)
202 87 : pack_(NULL), big_file_(big_file), pos_(0), idx_(0), pos_in_bucket_(0) {
203 87 const int fd = fileno(big_file_);
204
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 87 assert(fd >= 0);
205 platform_stat64 info;
206 87 const int retval = platform_fstat(fd, &info);
207
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 87 assert(retval == 0);
208
209
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 87 InitializeHeader(2, 1, info.st_size, &header_);
210
211
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 87 AppendItemToHeader(ObjectPack::kNamed, id.ToString(true), info.st_size,
212 file_name, &header_);
213
214
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 87 rewind(big_file);
215 87 }
216
217 /**
218 * Copies as many bytes as possible into buf. If the returned number of bytes
219 * is shorter than buf_size, everything has been produced.
220 */
221 911211 unsigned ObjectPackProducer::ProduceNext(const unsigned buf_size,
222 unsigned char *buf) {
223 911211 const unsigned remaining_in_header = (pos_ < header_.size())
224 9607 ? (header_.size() - pos_)
225
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 920818 : 0;
226 911211 const unsigned nbytes_header = std::min(remaining_in_header, buf_size);
227
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 911211 if (nbytes_header) {
228 9607 memcpy(buf, header_.data() + pos_, nbytes_header);
229 9607 pos_ += nbytes_header;
230 }
231
232 911211 unsigned remaining_in_buf = buf_size - nbytes_header;
233
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 911211 if (remaining_in_buf == 0)
234 7366 return nbytes_header;
235 903845 unsigned nbytes_payload = 0;
236
237
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 903845 if (big_file_) {
238
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 551 const size_t nbytes = fread(buf + nbytes_header, 1, remaining_in_buf,
239 big_file_);
240 551 nbytes_payload = nbytes;
241 551 pos_ += nbytes_payload;
242
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 903294 } else if (idx_ < pack_->GetNoObjects()) {
243 // Copy a few buckets more
244
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 2005436 while ((remaining_in_buf) > 0 && (idx_ < pack_->GetNoObjects())) {
245 1102420 const unsigned remaining_in_bucket = pack_->BucketSize(idx_)
246 1102420 - pos_in_bucket_;
247 1102420 const unsigned nbytes = std::min(remaining_in_buf, remaining_in_bucket);
248 2204840 memcpy(buf + nbytes_header + nbytes_payload,
249 1102420 pack_->BucketContent(idx_) + pos_in_bucket_, nbytes);
250
251 1102420 pos_in_bucket_ += nbytes;
252 1102420 nbytes_payload += nbytes;
253 1102420 remaining_in_buf -= nbytes;
254
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 1102420 if (nbytes == remaining_in_bucket) {
255 201587 pos_in_bucket_ = 0;
256 201587 idx_++;
257 }
258 }
259 }
260
261 903845 return nbytes_header + nbytes_payload;
262 }
263
264 //------------------------------------------------------------------------------
265
266 2136 ObjectPackConsumer::ObjectPackConsumer(const shash::Any &expected_digest,
267 2136 const unsigned expected_header_size)
268 2136 : expected_digest_(expected_digest)
269 2136 , expected_header_size_(expected_header_size)
270 2136 , pos_(0)
271 2136 , idx_(0)
272 2136 , pos_in_object_(0)
273 2136 , pos_in_accu_(0)
274 2136 , state_(ObjectPackBuild::kStateContinue)
275 2136 , size_(0) {
276 // Upper limit of 100B per entry
277
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 2136 if (expected_header_size > (100 * ObjectPack::kMaxObjects)) {
278 ✗ state_ = ObjectPackBuild::kStateHeaderTooBig;
279 ✗ return;
280 }
281
282
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 2136 raw_header_.reserve(expected_header_size);
283 }
284
285 /**
286 * At the end of the function, pos_ will have progressed by buf_size (unless
287 * the buffer contains trailing garbage bytes.
288 */
289 909720 ObjectPackBuild::State ObjectPackConsumer::ConsumeNext(
290 const unsigned buf_size, const unsigned char *buf) {
291
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292 1943 return state_;
293
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 907777 if (state_ == ObjectPackBuild::kStateDone) {
294 ✗ state_ = ObjectPackBuild::kStateTrailingBytes;
295 ✗ return state_;
296 }
297
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 907777 if (state_ != ObjectPackBuild::kStateContinue)
298 ✗ return state_;
299
300
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 907777 const unsigned remaining_in_header = (pos_ < expected_header_size_)
301 7124 ? (expected_header_size_ - pos_)
302 : 0;
303 907777 const unsigned nbytes_header = std::min(remaining_in_header, buf_size);
304
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 907777 if (nbytes_header) {
305
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 7124 raw_header_ += string(reinterpret_cast<const char *>(buf), nbytes_header);
306 7124 pos_ += nbytes_header;
307 }
308
309
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 907777 if (pos_ < expected_header_size_)
310 4988 return ObjectPackBuild::kStateContinue;
311
312 // This condition can only be true once through the lifetime of the
313 // Consumer.
314
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 902789 if (nbytes_header && (pos_ == expected_header_size_)) {
315
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 2136 shash::Any digest(expected_digest_.algorithm);
316
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 2136 shash::HashString(raw_header_, &digest);
317
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 2136 if (digest != expected_digest_) {
318 ✗ state_ = ObjectPackBuild::kStateCorrupt;
319 58 return state_;
320 } else {
321
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 2136 const bool retval = ParseHeader();
322
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 2136 if (!retval) {
323 ✗ state_ = ObjectPackBuild::kStateBadFormat;
324 ✗ return state_;
325 }
326 // We don't need the raw string anymore
327 2136 raw_header_.clear();
328 }
329
330 // Empty pack?
331
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 2136 if ((buf_size == nbytes_header) && (index_.size() == 0)) {
332 58 state_ = ObjectPackBuild::kStateDone;
333 58 return state_;
334 }
335 }
336
337 902731 const unsigned remaining_in_buf = buf_size - nbytes_header;
338 902731 const unsigned char *payload = buf + nbytes_header;
339
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 902731 return ConsumePayload(remaining_in_buf, payload);
340 }
341
342 /**
343 * Informs listeners for small complete objects. For large objects, buffers
344 * the
345 * input into reasonably sized chunks. buf can contain both a chunk of data
346 * that needs to be added to the consumer's accumulator and a bunch of
347 * complete small objects. We use the accumulator only if necessary to avoid
348 * unnecessary memory copies.
349 */
350 902731 ObjectPackBuild::State ObjectPackConsumer::ConsumePayload(
351 const unsigned buf_size, const unsigned char *buf) {
352 902731 uint64_t pos_in_buf = 0;
353 2139368 while ((idx_ < index_.size())
354
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 2139368 && ((pos_in_buf < buf_size) || (index_[idx_].size == 0))) {
355 // Fill the accumulator or process next small object
356 uint64_t nbytes; // How many bytes are consumed in this iteration
357 1236637 const uint64_t remaining_in_buf = buf_size - pos_in_buf;
358 1236637 const uint64_t remaining_in_object = index_[idx_].size - pos_in_object_;
359 1236637 const bool is_small_rest = remaining_in_buf < kAccuSize;
360
361 // We use the accumulator if there is already something in or if we have a
362 // small piece of data of a larger object.
363 1236637 nbytes = std::min(remaining_in_object, remaining_in_buf);
364
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 1236637 if ((pos_in_accu_ > 0)
365
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 941910 || ((remaining_in_buf < remaining_in_object) && is_small_rest)) {
366 433405 const uint64_t remaining_in_accu = kAccuSize - pos_in_accu_;
367 433405 nbytes = std::min(remaining_in_accu, nbytes);
368 433405 memcpy(accumulator_ + pos_in_accu_, buf + pos_in_buf, nbytes);
369 433405 pos_in_accu_ += nbytes;
370
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 433405 if ((pos_in_accu_ == kAccuSize) || (nbytes == remaining_in_object)) {
371
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 138678 NotifyListeners(ObjectPackBuild::Event(
372
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 138678 index_[idx_].id, index_[idx_].size, pos_in_accu_, accumulator_,
373 138678 index_[idx_].entry_type, index_[idx_].entry_name));
374 138678 pos_in_accu_ = 0;
375 }
376 433405 } else { // directly trigger listeners using buf
377
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 803232 NotifyListeners(ObjectPackBuild::Event(
378
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 803232 index_[idx_].id, index_[idx_].size, nbytes, buf + pos_in_buf,
379 803232 index_[idx_].entry_type, index_[idx_].entry_name));
380 }
381
382 1236637 pos_in_buf += nbytes;
383 1236637 pos_in_object_ += nbytes;
384
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 1236637 if (nbytes == remaining_in_object) {
385 201453 idx_++;
386 201453 pos_in_object_ = 0;
387 }
388 }
389
390 902731 pos_ += buf_size;
391
392
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 902731 if (idx_ == index_.size())
393
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 2078 state_ = (pos_in_buf == buf_size) ? ObjectPackBuild::kStateDone
394 : ObjectPackBuild::kStateTrailingBytes;
395 else
396 900653 state_ = ObjectPackBuild::kStateContinue;
397 902731 return state_;
398 }
399
400 2136 bool ObjectPackConsumer::ParseHeader() {
401 2136 map<char, string> header;
402 const unsigned char *data = reinterpret_cast<const unsigned char *>(
403 2136 raw_header_.data());
404
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 2136 ParseKeyvalMem(data, raw_header_.size(), &header);
405
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 2136 if (header.find('V') == header.end())
406 ✗ return false;
407
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 2136 if (header['V'] != "2")
408 ✗ return false;
409
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 2136 size_ = String2Uint64(header['S']);
410
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 2136 const unsigned nobjects = String2Uint64(header['N']);
411
412
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 2136 if (nobjects == 0)
413 58 return true;
414
415 // Build the object index
416 2078 const size_t separator_idx = raw_header_.find("--\n");
417
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 2078 if (separator_idx == string::npos)
418 ✗ return false;
419 2078 unsigned index_idx = separator_idx + 3;
420
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 2078 if (index_idx >= raw_header_.size())
421 ✗ return false;
422
423 2078 uint64_t sum_size = 0;
424 do {
425 201453 const unsigned remaining_in_header = raw_header_.size() - index_idx;
426 402906 const string line = GetLineMem(raw_header_.data() + index_idx,
427
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 201453 remaining_in_header);
428
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 201453 if (line == "")
429 ✗ break;
430
431
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 201453 IndexEntry entry;
432
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 201453 if (!ParseItem(line, &entry, &sum_size)) {
433 ✗ break;
434 }
435
436
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 201453 index_.push_back(entry);
437 201453 index_idx += line.size() + 1;
438
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 402906 } while (index_idx < raw_header_.size());
439
440
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 2078 return (nobjects == index_.size()) && (size_ == sum_size);
441 2136 }
442
443 201453 bool ObjectPackConsumer::ParseItem(const std::string &line,
444 ObjectPackConsumer::IndexEntry *entry,
445 uint64_t *sum_size) {
446
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 201453 if (!entry || !sum_size) {
447 ✗ return false;
448 }
449
450
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 201453 if (line[0] == 'C') { // CAS blob
451 201424 const ObjectPack::BucketContentType entry_type = ObjectPack::kCas;
452
453 // We could use SplitString but we can have many lines so we do something
454 // more efficient here
455 201424 const size_t separator = line.find(' ', 2);
456
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 201424 if ((separator == string::npos) || (separator == (line.size() - 1))) {
457 ✗ return false;
458 }
459
460
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 201424 const uint64_t size = String2Uint64(line.substr(separator + 1));
461 201424 *sum_size += size;
462
463 // Warning do not construct a HexPtr with an rvalue!
464 // The constructor takes the address of its argument.
465
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 201424 const std::string hash_string = line.substr(2, separator - 2);
466 201424 const shash::HexPtr hex_ptr(hash_string);
467
468
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 201424 entry->id = shash::MkFromSuffixedHexPtr(hex_ptr);
469 201424 entry->size = size;
470 201424 entry->entry_type = entry_type;
471
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 201424 entry->entry_name = "";
472
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 201453 } else if (line[0] == 'N') { // Named file
473 29 const ObjectPack::BucketContentType entry_type = ObjectPack::kNamed;
474
475 // First separator, before the size field
476 29 const size_t separator1 = line.find(' ', 2);
477
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 29 if ((separator1 == string::npos) || (separator1 == (line.size() - 1))) {
478 ✗ return false;
479 }
480
481 // Second separator, before the name field
482 29 const size_t separator2 = line.find(' ', separator1 + 1);
483
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 29 if ((separator1 == 0) || (separator1 == string::npos)
484
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 58 || (separator1 == (line.size() - 1))) {
485 ✗ return false;
486 }
487
488
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 29 const uint64_t size = String2Uint64(
489
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 58 line.substr(separator1 + 1, separator2 - separator1 - 1));
490
491 29 std::string name;
492
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 29 if (!Debase64(line.substr(separator2 + 1), &name)) {
493 ✗ return false;
494 }
495
496 29 *sum_size += size;
497
498 // Warning do not construct a HexPtr with an rvalue!
499 // The constructor takes the address of its argument.
500
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 29 const std::string hash_string = line.substr(2, separator1 - 2);
501 29 const shash::HexPtr hex_ptr(hash_string);
502
503
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 29 entry->id = shash::MkFromSuffixedHexPtr(hex_ptr);
504 29 entry->size = size;
505 29 entry->entry_type = entry_type;
506
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 29 entry->entry_name = name;
507
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 29 } else { // Error
508 ✗ return false;
509 }
510
511 201453 return true;
512 }
513