GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/pack.cc
Date: 2026-07-05 02:36:18
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/exception.h"
13 #include "util/platform.h"
14 #include "util/smalloc.h"
15 #include "util/string.h"
16
17 using namespace std; // NOLINT
18
19 namespace { // some private utility functions used by ObjectPackProducer
20
21 2592 void InitializeHeader(const int version, const int num_objects,
22 const size_t pack_size, std::string *header) {
23
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 2592 if (header) {
24
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 2592 *header = "V" + StringifyInt(version) + "\n";
25
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 2592 *header += "S" + StringifyInt(pack_size) + "\n";
26
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 2592 *header += "N" + StringifyInt(num_objects) + "\n";
27 2592 *header += "--\n";
28 }
29 2592 }
30
31 222900 void AppendItemToHeader(ObjectPack::BucketContentType object_type,
32 const std::string &hash_str, const size_t object_size,
33 const std::string &object_name, std::string *header) {
34 // If the item type is kName, the "item_name" parameter should not be empty
35
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 222900 assert((object_type == ObjectPack::kCas)
36 || ((object_type == ObjectPack::kNamed) && (!object_name.empty())));
37
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 222900 std::string line_prefix = "";
38
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 222900 std::string line_suffix = "";
39
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 222900 switch (object_type) {
40 99 case ObjectPack::kNamed:
41
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 99 line_prefix = "N ";
42
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 99 line_suffix = std::string(" ") + Base64Url(object_name);
43 99 break;
44 222801 case ObjectPack::kCas:
45
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 222801 line_prefix = "C ";
46 222801 break;
47 ✗ default:
48 ✗ PANIC(kLogStderr, "Unknown object pack type to be added to header.");
49 }
50
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 222900 if (header) {
51
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 445800 *header += line_prefix + hash_str + " " + StringifyInt(object_size)
52
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 222900 + line_suffix + "\n";
53 }
54 222900 }
55
56 } // namespace
57
58 3312174 ObjectPack::Bucket::Bucket()
59 3312174 : content(reinterpret_cast<unsigned char *>(smalloc(kInitialSize)))
60 3312174 , size(0)
61 3312174 , capacity(kInitialSize)
62 3312174 , content_type(kEmpty)
63 6624348 , name() { }
64
65 11811 void ObjectPack::Bucket::Add(const void *buf, const uint64_t buf_size) {
66
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 11811 if (buf_size == 0)
67 ✗ return;
68
69
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 150825 while (size + buf_size > capacity) {
70 139014 capacity *= 2;
71 139014 content = reinterpret_cast<unsigned char *>(srealloc(content, capacity));
72 }
73 11811 memcpy(content + size, buf, buf_size);
74 11811 size += buf_size;
75 }
76
77 3312174 ObjectPack::Bucket::~Bucket() { free(content); }
78
79 //------------------------------------------------------------------------------
80
81 1729 ObjectPack::ObjectPack(const uint64_t limit) : limit_(limit), size_(0) {
82 1729 InitLock();
83 1729 }
84
85 1710 ObjectPack::~ObjectPack() {
86 3420 for (std::set<BucketHandle>::const_iterator i = open_buckets_.begin(),
87 1710 iEnd = open_buckets_.end();
88
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 3888 i != iEnd;
89 2178 ++i) {
90
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 2178 delete *i;
91 }
92
93
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 3311574 for (unsigned i = 0; i < buckets_.size(); ++i)
94
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 3309864 delete buckets_[i];
95 1710 pthread_mutex_destroy(lock_);
96 1710 free(lock_);
97 1710 }
98
99 2307 void ObjectPack::AddToBucket(const void *buf, const uint64_t size,
100 const ObjectPack::BucketHandle handle) {
101 2307 handle->Add(buf, size);
102 2307 }
103
104 3312141 ObjectPack::BucketHandle ObjectPack::NewBucket() {
105
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 3312141 BucketHandle handle = new Bucket();
106
107 3312141 const MutexLockGuard mutex_guard(lock_);
108
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 3312141 open_buckets_.insert(handle);
109 3312141 return handle;
110 3312141 }
111
112 /**
113 * Can only fail due to insufficient remaining space in the ObjectPack.
114 */
115 3312379 bool ObjectPack::CommitBucket(const BucketContentType type,
116 const shash::Any &id,
117 const ObjectPack::BucketHandle handle,
118 const std::string &name) {
119 3312379 handle->id = id;
120
121 3312379 handle->content_type = type;
122
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 3312379 if (type == kNamed) {
123 ✗ handle->name = name;
124 }
125
126 3312379 const MutexLockGuard mutex_guard(lock_);
127
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 3312379 if (buckets_.size() >= kMaxObjects)
128 33 return false;
129
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 3312346 if (size_ + handle->size > limit_)
130 2482 return false;
131
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 3309864 open_buckets_.erase(handle);
132
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 3309864 buckets_.push_back(handle);
133 3309864 size_ += handle->size;
134 3309864 return true;
135 3312379 }
136
137 99 void ObjectPack::DiscardBucket(const BucketHandle handle) {
138 99 const MutexLockGuard mutex_guard(lock_);
139
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 99 open_buckets_.erase(handle);
140
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 99 delete handle;
141 99 }
142
143 1729 void ObjectPack::InitLock() {
144 1729 lock_ = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
145 1729 const int retval = pthread_mutex_init(lock_, NULL);
146
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 1729 assert(retval == 0);
147 1729 }
148
149 /**
150 * If a commit failed, an open Bucket can be transferred to another ObjectPack
151 * with more space.
152 */
153 451 void ObjectPack::TransferBucket(const ObjectPack::BucketHandle handle,
154 ObjectPack *other) {
155 451 const MutexLockGuard mutex_guard(lock_);
156
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 451 open_buckets_.erase(handle);
157
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 451 other->open_buckets_.insert(handle);
158 451 }
159
160 1248912 unsigned char *ObjectPack::BucketContent(size_t idx) const {
161
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 1248912 assert(idx < buckets_.size());
162 1248912 return buckets_[idx]->content;
163 }
164
165 1471713 uint64_t ObjectPack::BucketSize(size_t idx) const {
166
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 1471713 assert(idx < buckets_.size());
167 1471713 return buckets_[idx]->size;
168 }
169
170 222801 const shash::Any &ObjectPack::BucketId(size_t idx) const {
171
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 222801 assert(idx < buckets_.size());
172 222801 return buckets_[idx]->id;
173 }
174
175 //------------------------------------------------------------------------------
176
177 /**
178 * Hash over the header. The hash algorithm needs to be provided by hash.
179 */
180 2389 void ObjectPackProducer::GetDigest(shash::Any *hash) {
181
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 2389 assert(hash);
182 2389 shash::HashString(header_, hash);
183 2389 }
184
185 2493 ObjectPackProducer::ObjectPackProducer(ObjectPack *pack)
186 2493 : pack_(pack), big_file_(NULL), pos_(0), idx_(0), pos_in_bucket_(0) {
187 2493 const unsigned N = pack->GetNoObjects();
188 // rough guess, most likely a little too much
189
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 2493 header_.reserve(30 + N * (2 * shash::kMaxDigestSize + 5));
190
191
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 2493 InitializeHeader(2, N, pack->size(), &header_);
192
193
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 225294 for (unsigned i = 0; i < N; ++i) {
194
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 222801 AppendItemToHeader(ObjectPack::kCas, pack->BucketId(i).ToString(true),
195 pack->BucketSize(i), "", &header_);
196 }
197 2493 }
198
199 99 ObjectPackProducer::ObjectPackProducer(const shash::Any &id, FILE *big_file,
200 99 const std::string &file_name)
201 99 : pack_(NULL), big_file_(big_file), pos_(0), idx_(0), pos_in_bucket_(0) {
202 99 const int fd = fileno(big_file_);
203
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 99 assert(fd >= 0);
204 platform_stat64 info;
205 99 const int retval = platform_fstat(fd, &info);
206
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 99 assert(retval == 0);
207
208
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 99 InitializeHeader(2, 1, info.st_size, &header_);
209
210
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 99 AppendItemToHeader(ObjectPack::kNamed, id.ToString(true), info.st_size,
211 file_name, &header_);
212
213
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 99 rewind(big_file);
214 99 }
215
216 /**
217 * Copies as many bytes as possible into buf. If the returned number of bytes
218 * is shorter than buf_size, everything has been produced.
219 */
220 1037749 unsigned ObjectPackProducer::ProduceNext(const unsigned buf_size,
221 unsigned char *buf) {
222 1037749 const unsigned remaining_in_header = (pos_ < header_.size())
223 10842 ? (header_.size() - pos_)
224
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 1048591 : 0;
225 1037749 const unsigned nbytes_header = std::min(remaining_in_header, buf_size);
226
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 1037749 if (nbytes_header) {
227 10842 memcpy(buf, header_.data() + pos_, nbytes_header);
228 10842 pos_ += nbytes_header;
229 }
230
231 1037749 unsigned remaining_in_buf = buf_size - nbytes_header;
232
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 1037749 if (remaining_in_buf == 0)
233 8349 return nbytes_header;
234 1029400 unsigned nbytes_payload = 0;
235
236
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 1029400 if (big_file_) {
237
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 627 const size_t nbytes = fread(buf + nbytes_header, 1, remaining_in_buf,
238 big_file_);
239 627 nbytes_payload = nbytes;
240 627 pos_ += nbytes_payload;
241
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 1028773 } else if (idx_ < pack_->GetNoObjects()) {
242 // Copy a few buckets more
243
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 2277450 while ((remaining_in_buf) > 0 && (idx_ < pack_->GetNoObjects())) {
244 1248912 const unsigned remaining_in_bucket = pack_->BucketSize(idx_)
245 1248912 - pos_in_bucket_;
246 1248912 const unsigned nbytes = std::min(remaining_in_buf, remaining_in_bucket);
247 2497824 memcpy(buf + nbytes_header + nbytes_payload,
248 1248912 pack_->BucketContent(idx_) + pos_in_bucket_, nbytes);
249
250 1248912 pos_in_bucket_ += nbytes;
251 1248912 nbytes_payload += nbytes;
252 1248912 remaining_in_buf -= nbytes;
253
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 1248912 if (nbytes == remaining_in_bucket) {
254 222801 pos_in_bucket_ = 0;
255 222801 idx_++;
256 }
257 }
258 }
259
260 1029400 return nbytes_header + nbytes_payload;
261 }
262
263 //------------------------------------------------------------------------------
264
265 2422 ObjectPackConsumer::ObjectPackConsumer(const shash::Any &expected_digest,
266 2422 const unsigned expected_header_size)
267 2422 : expected_digest_(expected_digest)
268 2422 , expected_header_size_(expected_header_size)
269 2422 , pos_(0)
270 2422 , idx_(0)
271 2422 , pos_in_object_(0)
272 2422 , pos_in_accu_(0)
273 2422 , state_(ObjectPackBuild::kStateContinue)
274 2422 , size_(0) {
275 // Upper limit of 100B per entry
276
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 2422 if (expected_header_size > (100 * ObjectPack::kMaxObjects)) {
277 ✗ state_ = ObjectPackBuild::kStateHeaderTooBig;
278 ✗ return;
279 }
280
281
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 2422 raw_header_.reserve(expected_header_size);
282 }
283
284 /**
285 * At the end of the function, pos_ will have progressed by buf_size (unless
286 * the buffer contains trailing garbage bytes.
287 */
288 1036312 ObjectPackBuild::State ObjectPackConsumer::ConsumeNext(
289 const unsigned buf_size, const unsigned char *buf) {
290
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 1036312 if (buf_size == 0)
291 2211 return state_;
292
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 1034101 if (state_ == ObjectPackBuild::kStateDone) {
293 ✗ state_ = ObjectPackBuild::kStateTrailingBytes;
294 ✗ return state_;
295 }
296
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 1034101 if (state_ != ObjectPackBuild::kStateContinue)
297 ✗ return state_;
298
299
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 1034101 const unsigned remaining_in_header = (pos_ < expected_header_size_)
300 8065 ? (expected_header_size_ - pos_)
301 : 0;
302 1034101 const unsigned nbytes_header = std::min(remaining_in_header, buf_size);
303
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 1034101 if (nbytes_header) {
304
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 8065 raw_header_ += string(reinterpret_cast<const char *>(buf), nbytes_header);
305 8065 pos_ += nbytes_header;
306 }
307
308
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 1034101 if (pos_ < expected_header_size_)
309 5643 return ObjectPackBuild::kStateContinue;
310
311 // This condition can only be true once through the lifetime of the
312 // Consumer.
313
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 1028458 if (nbytes_header && (pos_ == expected_header_size_)) {
314
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 2422 shash::Any digest(expected_digest_.algorithm);
315
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 2422 shash::HashString(raw_header_, &digest);
316
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 2422 if (digest != expected_digest_) {
317 ✗ state_ = ObjectPackBuild::kStateCorrupt;
318 66 return state_;
319 } else {
320
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 2422 const bool retval = ParseHeader();
321
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 2422 if (!retval) {
322 ✗ state_ = ObjectPackBuild::kStateBadFormat;
323 ✗ return state_;
324 }
325 // We don't need the raw string anymore
326 2422 raw_header_.clear();
327 }
328
329 // Empty pack?
330
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 2422 if ((buf_size == nbytes_header) && (index_.size() == 0)) {
331 66 state_ = ObjectPackBuild::kStateDone;
332 66 return state_;
333 }
334 }
335
336 1028392 const unsigned remaining_in_buf = buf_size - nbytes_header;
337 1028392 const unsigned char *payload = buf + nbytes_header;
338
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 1028392 return ConsumePayload(remaining_in_buf, payload);
339 }
340
341 /**
342 * Informs listeners for small complete objects. For large objects, buffers
343 * the
344 * input into reasonably sized chunks. buf can contain both a chunk of data
345 * that needs to be added to the consumer's accumulator and a bunch of
346 * complete small objects. We use the accumulator only if necessary to avoid
347 * unnecessary memory copies.
348 */
349 1028392 ObjectPackBuild::State ObjectPackConsumer::ConsumePayload(
350 const unsigned buf_size, const unsigned char *buf) {
351 1028392 uint64_t pos_in_buf = 0;
352 2428562 while ((idx_ < index_.size())
353
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 2428562 && ((pos_in_buf < buf_size) || (index_[idx_].size == 0))) {
354 // Fill the accumulator or process next small object
355 uint64_t nbytes; // How many bytes are consumed in this iteration
356 1400170 const uint64_t remaining_in_buf = buf_size - pos_in_buf;
357 1400170 const uint64_t remaining_in_object = index_[idx_].size - pos_in_object_;
358 1400170 const bool is_small_rest = remaining_in_buf < kAccuSize;
359
360 // We use the accumulator if there is already something in or if we have a
361 // small piece of data of a larger object.
362 1400170 nbytes = std::min(remaining_in_object, remaining_in_buf);
363
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 1400170 if ((pos_in_accu_ > 0)
364
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 1065946 || ((remaining_in_buf < remaining_in_object) && is_small_rest)) {
365 490512 const uint64_t remaining_in_accu = kAccuSize - pos_in_accu_;
366 490512 nbytes = std::min(remaining_in_accu, nbytes);
367 490512 memcpy(accumulator_ + pos_in_accu_, buf + pos_in_buf, nbytes);
368 490512 pos_in_accu_ += nbytes;
369
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 490512 if ((pos_in_accu_ == kAccuSize) || (nbytes == remaining_in_object)) {
370
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 156288 NotifyListeners(ObjectPackBuild::Event(
371
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 156288 index_[idx_].id, index_[idx_].size, pos_in_accu_, accumulator_,
372 156288 index_[idx_].entry_type, index_[idx_].entry_name));
373 156288 pos_in_accu_ = 0;
374 }
375 490512 } else { // directly trigger listeners using buf
376
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 909658 NotifyListeners(ObjectPackBuild::Event(
377
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 909658 index_[idx_].id, index_[idx_].size, nbytes, buf + pos_in_buf,
378 909658 index_[idx_].entry_type, index_[idx_].entry_name));
379 }
380
381 1400170 pos_in_buf += nbytes;
382 1400170 pos_in_object_ += nbytes;
383
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 1400170 if (nbytes == remaining_in_object) {
384 222697 idx_++;
385 222697 pos_in_object_ = 0;
386 }
387 }
388
389 1028392 pos_ += buf_size;
390
391
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 1028392 if (idx_ == index_.size())
392
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 2356 state_ = (pos_in_buf == buf_size) ? ObjectPackBuild::kStateDone
393 : ObjectPackBuild::kStateTrailingBytes;
394 else
395 1026036 state_ = ObjectPackBuild::kStateContinue;
396 1028392 return state_;
397 }
398
399 2422 bool ObjectPackConsumer::ParseHeader() {
400 2422 map<char, string> header;
401 const unsigned char *data = reinterpret_cast<const unsigned char *>(
402 2422 raw_header_.data());
403
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 2422 ParseKeyvalMem(data, raw_header_.size(), &header);
404
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 2422 if (header.find('V') == header.end())
405 ✗ return false;
406
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 2422 if (header['V'] != "2")
407 ✗ return false;
408
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 2422 size_ = String2Uint64(header['S']);
409
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 2422 const unsigned nobjects = String2Uint64(header['N']);
410
411
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 2422 if (nobjects == 0)
412 66 return true;
413
414 // Build the object index
415 2356 const size_t separator_idx = raw_header_.find("--\n");
416
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 2356 if (separator_idx == string::npos)
417 ✗ return false;
418 2356 unsigned index_idx = separator_idx + 3;
419
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 2356 if (index_idx >= raw_header_.size())
420 ✗ return false;
421
422 2356 uint64_t sum_size = 0;
423 do {
424 222697 const unsigned remaining_in_header = raw_header_.size() - index_idx;
425 445394 const string line = GetLineMem(raw_header_.data() + index_idx,
426
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 222697 remaining_in_header);
427
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 222697 if (line == "")
428 ✗ break;
429
430
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 222697 IndexEntry entry;
431
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 222697 if (!ParseItem(line, &entry, &sum_size)) {
432 ✗ break;
433 }
434
435
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 222697 index_.push_back(entry);
436 222697 index_idx += line.size() + 1;
437
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 445394 } while (index_idx < raw_header_.size());
438
439
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 2356 return (nobjects == index_.size()) && (size_ == sum_size);
440 2422 }
441
442 222697 bool ObjectPackConsumer::ParseItem(const std::string &line,
443 ObjectPackConsumer::IndexEntry *entry,
444 uint64_t *sum_size) {
445
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 222697 if (!entry || !sum_size) {
446 ✗ return false;
447 }
448
449
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 222697 if (line[0] == 'C') { // CAS blob
450 222664 const ObjectPack::BucketContentType entry_type = ObjectPack::kCas;
451
452 // We could use SplitString but we can have many lines so we do something
453 // more efficient here
454 222664 const size_t separator = line.find(' ', 2);
455
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 222664 if ((separator == string::npos) || (separator == (line.size() - 1))) {
456 ✗ return false;
457 }
458
459
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 222664 const uint64_t size = String2Uint64(line.substr(separator + 1));
460 222664 *sum_size += size;
461
462 // Warning do not construct a HexPtr with an rvalue!
463 // The constructor takes the address of its argument.
464
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 222664 const std::string hash_string = line.substr(2, separator - 2);
465 222664 const shash::HexPtr hex_ptr(hash_string);
466
467
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 222664 entry->id = shash::MkFromSuffixedHexPtr(hex_ptr);
468 222664 entry->size = size;
469 222664 entry->entry_type = entry_type;
470
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 222664 entry->entry_name = "";
471
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 222697 } else if (line[0] == 'N') { // Named file
472 33 const ObjectPack::BucketContentType entry_type = ObjectPack::kNamed;
473
474 // First separator, before the size field
475 33 const size_t separator1 = line.find(' ', 2);
476
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 33 if ((separator1 == string::npos) || (separator1 == (line.size() - 1))) {
477 ✗ return false;
478 }
479
480 // Second separator, before the name field
481 33 const size_t separator2 = line.find(' ', separator1 + 1);
482
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 33 if ((separator1 == 0) || (separator1 == string::npos)
483
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 66 || (separator1 == (line.size() - 1))) {
484 ✗ return false;
485 }
486
487
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 33 const uint64_t size = String2Uint64(
488
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 66 line.substr(separator1 + 1, separator2 - separator1 - 1));
489
490 33 std::string name;
491
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 33 if (!Debase64(line.substr(separator2 + 1), &name)) {
492 ✗ return false;
493 }
494
495 33 *sum_size += size;
496
497 // Warning do not construct a HexPtr with an rvalue!
498 // The constructor takes the address of its argument.
499
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 33 const std::string hash_string = line.substr(2, separator1 - 2);
500 33 const shash::HexPtr hex_ptr(hash_string);
501
502
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 33 entry->id = shash::MkFromSuffixedHexPtr(hex_ptr);
503 33 entry->size = size;
504 33 entry->entry_type = entry_type;
505
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 33 entry->entry_name = name;
506
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 33 } else { // Error
507 ✗ return false;
508 }
509
510 222697 return true;
511 }
512