GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/pack.cc
Date: 2026-08-16 02:40:26
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 2421 void InitializeHeader(const int version, const int num_objects,
22 const size_t pack_size, std::string *header) {
23
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 2421 if (header) {
24
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 2421 *header = "V" + StringifyInt(version) + "\n";
25
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 2421 *header += "S" + StringifyInt(pack_size) + "\n";
26
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 2421 *header += "N" + StringifyInt(num_objects) + "\n";
27 2421 *header += "--\n";
28 }
29 2421 }
30
31 191031 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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 191031 assert((object_type == ObjectPack::kCas)
36 || ((object_type == ObjectPack::kNamed) && (!object_name.empty())));
37
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 191031 std::string line_prefix = "";
38
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 191031 std::string line_suffix = "";
39
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 191031 switch (object_type) {
40 90 case ObjectPack::kNamed:
41
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 90 line_prefix = "N ";
42
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 90 line_suffix = std::string(" ") + Base64Url(object_name);
43 90 break;
44 190941 case ObjectPack::kCas:
45
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 190941 line_prefix = "C ";
46 190941 break;
47 ✗ default:
48 ✗ PANIC(kLogStderr, "Unknown object pack type to be added to header.");
49 }
50
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 191031 if (header) {
51
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 382062 *header += line_prefix + hash_str + " " + StringifyInt(object_size)
52
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 191031 + line_suffix + "\n";
53 }
54 191031 }
55
56 } // namespace
57
58 3011823 ObjectPack::Bucket::Bucket()
59 3011823 : content(reinterpret_cast<unsigned char *>(smalloc(kInitialSize)))
60 3011823 , size(0)
61 3011823 , capacity(kInitialSize)
62 3011823 , content_type(kEmpty)
63 6023646 , name() { }
64
65 11493 void ObjectPack::Bucket::Add(const void *buf, const uint64_t buf_size) {
66
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 11493 if (buf_size == 0)
67 ✗ return;
68
69
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 136908 while (size + buf_size > capacity) {
70 125415 capacity *= 2;
71 125415 content = reinterpret_cast<unsigned char *>(srealloc(content, capacity));
72 }
73 11493 memcpy(content + size, buf, buf_size);
74 11493 size += buf_size;
75 }
76
77 3011823 ObjectPack::Bucket::~Bucket() { free(content); }
78
79 //------------------------------------------------------------------------------
80
81 2403 ObjectPack::ObjectPack(const uint64_t limit) : limit_(limit), size_(0) {
82 2403 InitLock();
83 2403 }
84
85 2361 ObjectPack::~ObjectPack() {
86 4722 for (std::set<BucketHandle>::const_iterator i = open_buckets_.begin(),
87 2361 iEnd = open_buckets_.end();
88
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 4341 i != iEnd;
89 1980 ++i) {
90
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 1980 delete *i;
91 }
92
93
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 3012084 for (unsigned i = 0; i < buckets_.size(); ++i)
94
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 3009723 delete buckets_[i];
95 2361 pthread_mutex_destroy(lock_);
96 2361 free(lock_);
97 2361 }
98
99 3423 void ObjectPack::AddToBucket(const void *buf, const uint64_t size,
100 const ObjectPack::BucketHandle handle) {
101 3423 handle->Add(buf, size);
102 3423 }
103
104 3011793 ObjectPack::BucketHandle ObjectPack::NewBucket() {
105
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 3011793 BucketHandle handle = new Bucket();
106
107 3011793 const MutexLockGuard mutex_guard(lock_);
108
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 3011793 open_buckets_.insert(handle);
109 3011793 return handle;
110 3011793 }
111
112 /**
113 * Can only fail due to insufficient remaining space in the ObjectPack.
114 */
115 3012405 bool ObjectPack::CommitBucket(const BucketContentType type,
116 const shash::Any &id,
117 const ObjectPack::BucketHandle handle,
118 const std::string &name) {
119 3012405 handle->id = id;
120
121 3012405 handle->content_type = type;
122
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 3012405 if (type == kNamed) {
123 ✗ handle->name = name;
124 }
125
126 3012405 const MutexLockGuard mutex_guard(lock_);
127
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 3012405 if (buckets_.size() >= kMaxObjects)
128 30 return false;
129
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 3012375 if (size_ + handle->size > limit_)
130 2652 return false;
131
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 3009723 open_buckets_.erase(handle);
132
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 3009723 buckets_.push_back(handle);
133 3009723 size_ += handle->size;
134 3009723 return true;
135 3012405 }
136
137 90 void ObjectPack::DiscardBucket(const BucketHandle handle) {
138 90 const MutexLockGuard mutex_guard(lock_);
139
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 90 open_buckets_.erase(handle);
140
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 90 delete handle;
141 90 }
142
143 2403 void ObjectPack::InitLock() {
144 2403 lock_ = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
145 2403 const int retval = pthread_mutex_init(lock_, NULL);
146
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 2403 assert(retval == 0);
147 2403 }
148
149 /**
150 * If a commit failed, an open Bucket can be transferred to another ObjectPack
151 * with more space.
152 */
153 954 void ObjectPack::TransferBucket(const ObjectPack::BucketHandle handle,
154 ObjectPack *other) {
155 954 const MutexLockGuard mutex_guard(lock_);
156
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 954 open_buckets_.erase(handle);
157
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 954 other->open_buckets_.insert(handle);
158 954 }
159
160 1119198 unsigned char *ObjectPack::BucketContent(size_t idx) const {
161
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 1119198 assert(idx < buckets_.size());
162 1119198 return buckets_[idx]->content;
163 }
164
165 1310139 uint64_t ObjectPack::BucketSize(size_t idx) const {
166
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 1310139 assert(idx < buckets_.size());
167 1310139 return buckets_[idx]->size;
168 }
169
170 190941 const shash::Any &ObjectPack::BucketId(size_t idx) const {
171
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 190941 assert(idx < buckets_.size());
172 190941 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 2187 void ObjectPackProducer::GetDigest(shash::Any *hash) {
181
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 2187 assert(hash);
182 2187 shash::HashString(header_, hash);
183 2187 }
184
185 2331 ObjectPackProducer::ObjectPackProducer(ObjectPack *pack)
186 2331 : pack_(pack), big_file_(NULL), pos_(0), idx_(0), pos_in_bucket_(0) {
187 2331 const unsigned N = pack->GetNoObjects();
188 // rough guess, most likely a little too much
189
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 2331 header_.reserve(30 + N * (2 * shash::kMaxDigestSize + 5));
190
191
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 2331 InitializeHeader(2, N, pack->size(), &header_);
192
193
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 193272 for (unsigned i = 0; i < N; ++i) {
194
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 190941 AppendItemToHeader(ObjectPack::kCas, pack->BucketId(i).ToString(true),
195 pack->BucketSize(i), "", &header_);
196 }
197 2331 }
198
199 90 ObjectPackProducer::ObjectPackProducer(const shash::Any &id, FILE *big_file,
200 90 const std::string &file_name)
201 90 : pack_(NULL), big_file_(big_file), pos_(0), idx_(0), pos_in_bucket_(0) {
202 90 const int fd = fileno(big_file_);
203
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 90 assert(fd >= 0);
204 platform_stat64 info;
205 90 const int retval = platform_fstat(fd, &info);
206
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 90 assert(retval == 0);
207
208
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 90 InitializeHeader(2, 1, info.st_size, &header_);
209
210
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 90 AppendItemToHeader(ObjectPack::kNamed, id.ToString(true), info.st_size,
211 file_name, &header_);
212
213
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 90 rewind(big_file);
214 90 }
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 938991 unsigned ObjectPackProducer::ProduceNext(const unsigned buf_size,
221 unsigned char *buf) {
222 938991 const unsigned remaining_in_header = (pos_ < header_.size())
223 9921 ? (header_.size() - pos_)
224
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 948912 : 0;
225 938991 const unsigned nbytes_header = std::min(remaining_in_header, buf_size);
226
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 938991 if (nbytes_header) {
227 9921 memcpy(buf, header_.data() + pos_, nbytes_header);
228 9921 pos_ += nbytes_header;
229 }
230
231 938991 unsigned remaining_in_buf = buf_size - nbytes_header;
232
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 938991 if (remaining_in_buf == 0)
233 7590 return nbytes_header;
234 931401 unsigned nbytes_payload = 0;
235
236
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 931401 if (big_file_) {
237
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 570 const size_t nbytes = fread(buf + nbytes_header, 1, remaining_in_buf,
238 big_file_);
239 570 nbytes_payload = nbytes;
240 570 pos_ += nbytes_payload;
241
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 930831 } else if (idx_ < pack_->GetNoObjects()) {
242 // Copy a few buckets more
243
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 2049726 while ((remaining_in_buf) > 0 && (idx_ < pack_->GetNoObjects())) {
244 1119198 const unsigned remaining_in_bucket = pack_->BucketSize(idx_)
245 1119198 - pos_in_bucket_;
246 1119198 const unsigned nbytes = std::min(remaining_in_buf, remaining_in_bucket);
247 2238396 memcpy(buf + nbytes_header + nbytes_payload,
248 1119198 pack_->BucketContent(idx_) + pos_in_bucket_, nbytes);
249
250 1119198 pos_in_bucket_ += nbytes;
251 1119198 nbytes_payload += nbytes;
252 1119198 remaining_in_buf -= nbytes;
253
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 1119198 if (nbytes == remaining_in_bucket) {
254 190941 pos_in_bucket_ = 0;
255 190941 idx_++;
256 }
257 }
258 }
259
260 931401 return nbytes_header + nbytes_payload;
261 }
262
263 //------------------------------------------------------------------------------
264
265 2217 ObjectPackConsumer::ObjectPackConsumer(const shash::Any &expected_digest,
266 2217 const unsigned expected_header_size)
267 2217 : expected_digest_(expected_digest)
268 2217 , expected_header_size_(expected_header_size)
269 2217 , pos_(0)
270 2217 , idx_(0)
271 2217 , pos_in_object_(0)
272 2217 , pos_in_accu_(0)
273 2217 , state_(ObjectPackBuild::kStateContinue)
274 2217 , size_(0) {
275 // Upper limit of 100B per entry
276
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 2217 if (expected_header_size > (100 * ObjectPack::kMaxObjects)) {
277 ✗ state_ = ObjectPackBuild::kStateHeaderTooBig;
278 ✗ return;
279 }
280
281
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 2217 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 937407 ObjectPackBuild::State ObjectPackConsumer::ConsumeNext(
289 const unsigned buf_size, const unsigned char *buf) {
290
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 937407 if (buf_size == 0)
291 2010 return state_;
292
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 935397 if (state_ == ObjectPackBuild::kStateDone) {
293 ✗ state_ = ObjectPackBuild::kStateTrailingBytes;
294 ✗ return state_;
295 }
296
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 935397 if (state_ != ObjectPackBuild::kStateContinue)
297 ✗ return state_;
298
299
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 935397 const unsigned remaining_in_header = (pos_ < expected_header_size_)
300 7347 ? (expected_header_size_ - pos_)
301 : 0;
302 935397 const unsigned nbytes_header = std::min(remaining_in_header, buf_size);
303
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 935397 if (nbytes_header) {
304
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 7347 raw_header_ += string(reinterpret_cast<const char *>(buf), nbytes_header);
305 7347 pos_ += nbytes_header;
306 }
307
308
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 935397 if (pos_ < expected_header_size_)
309 5130 return ObjectPackBuild::kStateContinue;
310
311 // This condition can only be true once through the lifetime of the
312 // Consumer.
313
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 930267 if (nbytes_header && (pos_ == expected_header_size_)) {
314
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 2217 shash::Any digest(expected_digest_.algorithm);
315
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 2217 shash::HashString(raw_header_, &digest);
316
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 2217 if (digest != expected_digest_) {
317 ✗ state_ = ObjectPackBuild::kStateCorrupt;
318 60 return state_;
319 } else {
320
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 2217 const bool retval = ParseHeader();
321
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 2217 if (!retval) {
322 ✗ state_ = ObjectPackBuild::kStateBadFormat;
323 ✗ return state_;
324 }
325 // We don't need the raw string anymore
326 2217 raw_header_.clear();
327 }
328
329 // Empty pack?
330
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 2217 if ((buf_size == nbytes_header) && (index_.size() == 0)) {
331 60 state_ = ObjectPackBuild::kStateDone;
332 60 return state_;
333 }
334 }
335
336 930207 const unsigned remaining_in_buf = buf_size - nbytes_header;
337 930207 const unsigned char *payload = buf + nbytes_header;
338
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 930207 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 930207 ObjectPackBuild::State ObjectPackConsumer::ConsumePayload(
350 const unsigned buf_size, const unsigned char *buf) {
351 930207 uint64_t pos_in_buf = 0;
352 2185314 while ((idx_ < index_.size())
353
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 2185314 && ((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 1255107 const uint64_t remaining_in_buf = buf_size - pos_in_buf;
357 1255107 const uint64_t remaining_in_object = index_[idx_].size - pos_in_object_;
358 1255107 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 1255107 nbytes = std::min(remaining_in_object, remaining_in_buf);
363
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 1255107 if ((pos_in_accu_ > 0)
364
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 955467 || ((remaining_in_buf < remaining_in_object) && is_small_rest)) {
365 438330 const uint64_t remaining_in_accu = kAccuSize - pos_in_accu_;
366 438330 nbytes = std::min(remaining_in_accu, nbytes);
367 438330 memcpy(accumulator_ + pos_in_accu_, buf + pos_in_buf, nbytes);
368 438330 pos_in_accu_ += nbytes;
369
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 438330 if ((pos_in_accu_ == kAccuSize) || (nbytes == remaining_in_object)) {
370
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 138690 NotifyListeners(ObjectPackBuild::Event(
371
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 138690 index_[idx_].id, index_[idx_].size, pos_in_accu_, accumulator_,
372 138690 index_[idx_].entry_type, index_[idx_].entry_name));
373 138690 pos_in_accu_ = 0;
374 }
375 438330 } else { // directly trigger listeners using buf
376
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 816777 NotifyListeners(ObjectPackBuild::Event(
377
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 816777 index_[idx_].id, index_[idx_].size, nbytes, buf + pos_in_buf,
378 816777 index_[idx_].entry_type, index_[idx_].entry_name));
379 }
380
381 1255107 pos_in_buf += nbytes;
382 1255107 pos_in_object_ += nbytes;
383
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 1255107 if (nbytes == remaining_in_object) {
384 190797 idx_++;
385 190797 pos_in_object_ = 0;
386 }
387 }
388
389 930207 pos_ += buf_size;
390
391
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 930207 if (idx_ == index_.size())
392
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 2157 state_ = (pos_in_buf == buf_size) ? ObjectPackBuild::kStateDone
393 : ObjectPackBuild::kStateTrailingBytes;
394 else
395 928050 state_ = ObjectPackBuild::kStateContinue;
396 930207 return state_;
397 }
398
399 2217 bool ObjectPackConsumer::ParseHeader() {
400 2217 map<char, string> header;
401 const unsigned char *data = reinterpret_cast<const unsigned char *>(
402 2217 raw_header_.data());
403
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 2217 ParseKeyvalMem(data, raw_header_.size(), &header);
404
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 2217 if (header.find('V') == header.end())
405 ✗ return false;
406
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 2217 if (header['V'] != "2")
407 ✗ return false;
408
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 2217 size_ = String2Uint64(header['S']);
409
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 2217 const unsigned nobjects = String2Uint64(header['N']);
410
411
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 2217 if (nobjects == 0)
412 60 return true;
413
414 // Build the object index
415 2157 const size_t separator_idx = raw_header_.find("--\n");
416
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 2157 if (separator_idx == string::npos)
417 ✗ return false;
418 2157 unsigned index_idx = separator_idx + 3;
419
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 2157 if (index_idx >= raw_header_.size())
420 ✗ return false;
421
422 2157 uint64_t sum_size = 0;
423 do {
424 190797 const unsigned remaining_in_header = raw_header_.size() - index_idx;
425 381594 const string line = GetLineMem(raw_header_.data() + index_idx,
426
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 190797 remaining_in_header);
427
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 190797 if (line == "")
428 ✗ break;
429
430
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 190797 IndexEntry entry;
431
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 190797 if (!ParseItem(line, &entry, &sum_size)) {
432 ✗ break;
433 }
434
435
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 190797 index_.push_back(entry);
436 190797 index_idx += line.size() + 1;
437
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 381594 } while (index_idx < raw_header_.size());
438
439
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 2157 return (nobjects == index_.size()) && (size_ == sum_size);
440 2217 }
441
442 190797 bool ObjectPackConsumer::ParseItem(const std::string &line,
443 ObjectPackConsumer::IndexEntry *entry,
444 uint64_t *sum_size) {
445
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 190797 if (!entry || !sum_size) {
446 ✗ return false;
447 }
448
449
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 190797 if (line[0] == 'C') { // CAS blob
450 190767 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 190767 const size_t separator = line.find(' ', 2);
455
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 190767 if ((separator == string::npos) || (separator == (line.size() - 1))) {
456 ✗ return false;
457 }
458
459
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 190767 const uint64_t size = String2Uint64(line.substr(separator + 1));
460 190767 *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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 190767 const std::string hash_string = line.substr(2, separator - 2);
465 190767 const shash::HexPtr hex_ptr(hash_string);
466
467
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 190767 entry->id = shash::MkFromSuffixedHexPtr(hex_ptr);
468 190767 entry->size = size;
469 190767 entry->entry_type = entry_type;
470
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 190767 entry->entry_name = "";
471
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 190797 } else if (line[0] == 'N') { // Named file
472 30 const ObjectPack::BucketContentType entry_type = ObjectPack::kNamed;
473
474 // First separator, before the size field
475 30 const size_t separator1 = line.find(' ', 2);
476
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 30 if ((separator1 == string::npos) || (separator1 == (line.size() - 1))) {
477 ✗ return false;
478 }
479
480 // Second separator, before the name field
481 30 const size_t separator2 = line.find(' ', separator1 + 1);
482
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 30 if ((separator1 == 0) || (separator1 == string::npos)
483
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 60 || (separator1 == (line.size() - 1))) {
484 ✗ return false;
485 }
486
487
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 30 const uint64_t size = String2Uint64(
488
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 60 line.substr(separator1 + 1, separator2 - separator1 - 1));
489
490 30 std::string name;
491
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 30 if (!Debase64(line.substr(separator2 + 1), &name)) {
492 ✗ return false;
493 }
494
495 30 *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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 30 const std::string hash_string = line.substr(2, separator1 - 2);
500 30 const shash::HexPtr hex_ptr(hash_string);
501
502
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 30 entry->id = shash::MkFromSuffixedHexPtr(hex_ptr);
503 30 entry->size = size;
504 30 entry->entry_type = entry_type;
505
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 30 entry->entry_name = name;
506
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 30 } else { // Error
507 ✗ return false;
508 }
509
510 190797 return true;
511 }
512