GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/pack.cc
Date: 2025-08-03 02:35:45
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 2022 void InitializeHeader(const int version, const int num_objects,
23 const size_t pack_size, std::string *header) {
24
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 2022 if (header) {
25
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 2022 *header = "V" + StringifyInt(version) + "\n";
26
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 2022 *header += "S" + StringifyInt(pack_size) + "\n";
27
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 2022 *header += "N" + StringifyInt(num_objects) + "\n";
28 2022 *header += "--\n";
29 }
30 2022 }
31
32 156097 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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 156097 assert((object_type == ObjectPack::kCas)
37 || ((object_type == ObjectPack::kNamed) && (!object_name.empty())));
38
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 156097 std::string line_prefix = "";
39
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 156097 std::string line_suffix = "";
40
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 156097 switch (object_type) {
41 75 case ObjectPack::kNamed:
42
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 75 line_prefix = "N ";
43
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 75 line_suffix = std::string(" ") + Base64Url(object_name);
44 75 break;
45 156022 case ObjectPack::kCas:
46
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 156022 line_prefix = "C ";
47 156022 break;
48 ✗ default:
49 ✗ PANIC(kLogStderr, "Unknown object pack type to be added to header.");
50 }
51
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 156097 if (header) {
52
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 312194 *header += line_prefix + hash_str + " " + StringifyInt(object_size)
53
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 156097 + line_suffix + "\n";
54 }
55 156097 }
56
57 } // namespace
58
59 2509452 ObjectPack::Bucket::Bucket()
60 2509452 : content(reinterpret_cast<unsigned char *>(smalloc(kInitialSize)))
61 2509452 , size(0)
62 2509452 , capacity(kInitialSize)
63 2509452 , content_type(kEmpty)
64 5018904 , name() { }
65
66 9177 void ObjectPack::Bucket::Add(const void *buf, const uint64_t buf_size) {
67
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 9177 if (buf_size == 0)
68 ✗ return;
69
70
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 110562 while (size + buf_size > capacity) {
71 101385 capacity *= 2;
72 101385 content = reinterpret_cast<unsigned char *>(srealloc(content, capacity));
73 }
74 9177 memcpy(content + size, buf, buf_size);
75 9177 size += buf_size;
76 }
77
78 2509452 ObjectPack::Bucket::~Bucket() { free(content); }
79
80 //------------------------------------------------------------------------------
81
82 1852 ObjectPack::ObjectPack(const uint64_t limit) : limit_(limit), size_(0) {
83 1852 InitLock();
84 1852 }
85
86 1822 ObjectPack::~ObjectPack() {
87 3644 for (std::set<BucketHandle>::const_iterator i = open_buckets_.begin(),
88 1822 iEnd = open_buckets_.end();
89
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 3472 i != iEnd;
90 1650 ++i) {
91
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 1650 delete *i;
92 }
93
94
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 2509524 for (unsigned i = 0; i < buckets_.size(); ++i)
95
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 2507702 delete buckets_[i];
96 1822 pthread_mutex_destroy(lock_);
97 1822 free(lock_);
98 1822 }
99
100 2602 void ObjectPack::AddToBucket(const void *buf, const uint64_t size,
101 const ObjectPack::BucketHandle handle) {
102 2602 handle->Add(buf, size);
103 2602 }
104
105 2509427 ObjectPack::BucketHandle ObjectPack::NewBucket() {
106
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 2509427 BucketHandle handle = new Bucket();
107
108 2509427 const MutexLockGuard mutex_guard(lock_);
109
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 2509427 open_buckets_.insert(handle);
110 2509427 return handle;
111 2509427 }
112
113 /**
114 * Can only fail due to insufficient remaining space in the ObjectPack.
115 */
116 2509857 bool ObjectPack::CommitBucket(const BucketContentType type,
117 const shash::Any &id,
118 const ObjectPack::BucketHandle handle,
119 const std::string &name) {
120 2509857 handle->id = id;
121
122 2509857 handle->content_type = type;
123
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 2509857 if (type == kNamed) {
124 ✗ handle->name = name;
125 }
126
127 2509857 const MutexLockGuard mutex_guard(lock_);
128
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 2509857 if (buckets_.size() >= kMaxObjects)
129 25 return false;
130
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 2509832 if (size_ + handle->size > limit_)
131 2130 return false;
132
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 2507702 open_buckets_.erase(handle);
133
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 2507702 buckets_.push_back(handle);
134 2507702 size_ += handle->size;
135 2507702 return true;
136 2509857 }
137
138 75 void ObjectPack::DiscardBucket(const BucketHandle handle) {
139 75 const MutexLockGuard mutex_guard(lock_);
140
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 75 open_buckets_.erase(handle);
141
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 75 delete handle;
142 75 }
143
144 1852 void ObjectPack::InitLock() {
145 1852 lock_ = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
146 1852 const int retval = pthread_mutex_init(lock_, NULL);
147
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 1852 assert(retval == 0);
148 1852 }
149
150 /**
151 * If a commit failed, an open Bucket can be transferred to another ObjectPack
152 * with more space.
153 */
154 685 void ObjectPack::TransferBucket(const ObjectPack::BucketHandle handle,
155 ObjectPack *other) {
156 685 const MutexLockGuard mutex_guard(lock_);
157
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 685 open_buckets_.erase(handle);
158
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 685 other->open_buckets_.insert(handle);
159 685 }
160
161 930684 unsigned char *ObjectPack::BucketContent(size_t idx) const {
162
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 930684 assert(idx < buckets_.size());
163 930684 return buckets_[idx]->content;
164 }
165
166 1086706 uint64_t ObjectPack::BucketSize(size_t idx) const {
167
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 1086706 assert(idx < buckets_.size());
168 1086706 return buckets_[idx]->size;
169 }
170
171 156022 const shash::Any &ObjectPack::BucketId(size_t idx) const {
172
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 156022 assert(idx < buckets_.size());
173 156022 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 1837 void ObjectPackProducer::GetDigest(shash::Any *hash) {
182
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 1837 assert(hash);
183 1837 shash::HashString(header_, hash);
184 1837 }
185
186 1947 ObjectPackProducer::ObjectPackProducer(ObjectPack *pack)
187 1947 : pack_(pack), big_file_(NULL), pos_(0), idx_(0), pos_in_bucket_(0) {
188 1947 const unsigned N = pack->GetNoObjects();
189 // rough guess, most likely a little too much
190
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 1947 header_.reserve(30 + N * (2 * shash::kMaxDigestSize + 5));
191
192
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 1947 InitializeHeader(2, N, pack->size(), &header_);
193
194
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 157969 for (unsigned i = 0; i < N; ++i) {
195
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 156022 AppendItemToHeader(ObjectPack::kCas, pack->BucketId(i).ToString(true),
196 pack->BucketSize(i), "", &header_);
197 }
198 1947 }
199
200 75 ObjectPackProducer::ObjectPackProducer(const shash::Any &id, FILE *big_file,
201 75 const std::string &file_name)
202 75 : pack_(NULL), big_file_(big_file), pos_(0), idx_(0), pos_in_bucket_(0) {
203 75 const int fd = fileno(big_file_);
204
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 75 assert(fd >= 0);
205 platform_stat64 info;
206 75 const int retval = platform_fstat(fd, &info);
207
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 75 assert(retval == 0);
208
209
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 75 InitializeHeader(2, 1, info.st_size, &header_);
210
211
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 75 AppendItemToHeader(ObjectPack::kNamed, id.ToString(true), info.st_size,
212 file_name, &header_);
213
214
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 75 rewind(big_file);
215 75 }
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 783636 unsigned ObjectPackProducer::ProduceNext(const unsigned buf_size,
222 unsigned char *buf) {
223 783636 const unsigned remaining_in_header = (pos_ < header_.size())
224 8297 ? (header_.size() - pos_)
225
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 791933 : 0;
226 783636 const unsigned nbytes_header = std::min(remaining_in_header, buf_size);
227
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 783636 if (nbytes_header) {
228 8297 memcpy(buf, header_.data() + pos_, nbytes_header);
229 8297 pos_ += nbytes_header;
230 }
231
232 783636 unsigned remaining_in_buf = buf_size - nbytes_header;
233
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 783636 if (remaining_in_buf == 0)
234 6350 return nbytes_header;
235 777286 unsigned nbytes_payload = 0;
236
237
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 777286 if (big_file_) {
238
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 475 const size_t nbytes = fread(buf + nbytes_header, 1, remaining_in_buf,
239 big_file_);
240 475 nbytes_payload = nbytes;
241 475 pos_ += nbytes_payload;
242
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 776811 } else if (idx_ < pack_->GetNoObjects()) {
243 // Copy a few buckets more
244
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 1707243 while ((remaining_in_buf) > 0 && (idx_ < pack_->GetNoObjects())) {
245 930684 const unsigned remaining_in_bucket = pack_->BucketSize(idx_)
246 930684 - pos_in_bucket_;
247 930684 const unsigned nbytes = std::min(remaining_in_buf, remaining_in_bucket);
248 1861368 memcpy(buf + nbytes_header + nbytes_payload,
249 930684 pack_->BucketContent(idx_) + pos_in_bucket_, nbytes);
250
251 930684 pos_in_bucket_ += nbytes;
252 930684 nbytes_payload += nbytes;
253 930684 remaining_in_buf -= nbytes;
254
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 930684 if (nbytes == remaining_in_bucket) {
255 156022 pos_in_bucket_ = 0;
256 156022 idx_++;
257 }
258 }
259 }
260
261 777286 return nbytes_header + nbytes_payload;
262 }
263
264 //------------------------------------------------------------------------------
265
266 1862 ObjectPackConsumer::ObjectPackConsumer(const shash::Any &expected_digest,
267 1862 const unsigned expected_header_size)
268 1862 : expected_digest_(expected_digest)
269 1862 , expected_header_size_(expected_header_size)
270 1862 , pos_(0)
271 1862 , idx_(0)
272 1862 , pos_in_object_(0)
273 1862 , pos_in_accu_(0)
274 1862 , state_(ObjectPackBuild::kStateContinue)
275 1862 , size_(0) {
276 // Upper limit of 100B per entry
277
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 1862 if (expected_header_size > (100 * ObjectPack::kMaxObjects)) {
278 ✗ state_ = ObjectPackBuild::kStateHeaderTooBig;
279 ✗ return;
280 }
281
282
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 1862 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 782337 ObjectPackBuild::State ObjectPackConsumer::ConsumeNext(
290 const unsigned buf_size, const unsigned char *buf) {
291
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 782337 if (buf_size == 0)
292 1675 return state_;
293
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 780662 if (state_ == ObjectPackBuild::kStateDone) {
294 ✗ state_ = ObjectPackBuild::kStateTrailingBytes;
295 ✗ return state_;
296 }
297
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 780662 if (state_ != ObjectPackBuild::kStateContinue)
298 ✗ return state_;
299
300
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 780662 const unsigned remaining_in_header = (pos_ < expected_header_size_)
301 6162 ? (expected_header_size_ - pos_)
302 : 0;
303 780662 const unsigned nbytes_header = std::min(remaining_in_header, buf_size);
304
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 780662 if (nbytes_header) {
305
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 6162 raw_header_ += string(reinterpret_cast<const char *>(buf), nbytes_header);
306 6162 pos_ += nbytes_header;
307 }
308
309
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 780662 if (pos_ < expected_header_size_)
310 4300 return ObjectPackBuild::kStateContinue;
311
312 // This condition can only be true once through the lifetime of the
313 // Consumer.
314
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 776362 if (nbytes_header && (pos_ == expected_header_size_)) {
315
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 1862 shash::Any digest(expected_digest_.algorithm);
316
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 1862 shash::HashString(raw_header_, &digest);
317
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 1862 if (digest != expected_digest_) {
318 ✗ state_ = ObjectPackBuild::kStateCorrupt;
319 50 return state_;
320 } else {
321
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 1862 const bool retval = ParseHeader();
322
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 1862 if (!retval) {
323 ✗ state_ = ObjectPackBuild::kStateBadFormat;
324 ✗ return state_;
325 }
326 // We don't need the raw string anymore
327 1862 raw_header_.clear();
328 }
329
330 // Empty pack?
331
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 1862 if ((buf_size == nbytes_header) && (index_.size() == 0)) {
332 50 state_ = ObjectPackBuild::kStateDone;
333 50 return state_;
334 }
335 }
336
337 776312 const unsigned remaining_in_buf = buf_size - nbytes_header;
338 776312 const unsigned char *payload = buf + nbytes_header;
339
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 776312 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 776312 ObjectPackBuild::State ObjectPackConsumer::ConsumePayload(
351 const unsigned buf_size, const unsigned char *buf) {
352 776312 uint64_t pos_in_buf = 0;
353 1817374 while ((idx_ < index_.size())
354
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 1817374 && ((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 1041062 const uint64_t remaining_in_buf = buf_size - pos_in_buf;
358 1041062 const uint64_t remaining_in_object = index_[idx_].size - pos_in_object_;
359 1041062 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 1041062 nbytes = std::min(remaining_in_object, remaining_in_buf);
364
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 1041062 if ((pos_in_accu_ > 0)
365
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 793187 || ((remaining_in_buf < remaining_in_object) && is_small_rest)) {
366 361425 const uint64_t remaining_in_accu = kAccuSize - pos_in_accu_;
367 361425 nbytes = std::min(remaining_in_accu, nbytes);
368 361425 memcpy(accumulator_ + pos_in_accu_, buf + pos_in_buf, nbytes);
369 361425 pos_in_accu_ += nbytes;
370
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 361425 if ((pos_in_accu_ == kAccuSize) || (nbytes == remaining_in_object)) {
371
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 113550 NotifyListeners(ObjectPackBuild::Event(
372
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 113550 index_[idx_].id, index_[idx_].size, pos_in_accu_, accumulator_,
373 113550 index_[idx_].entry_type, index_[idx_].entry_name));
374 113550 pos_in_accu_ = 0;
375 }
376 361425 } else { // directly trigger listeners using buf
377
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 679637 NotifyListeners(ObjectPackBuild::Event(
378
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 679637 index_[idx_].id, index_[idx_].size, nbytes, buf + pos_in_buf,
379 679637 index_[idx_].entry_type, index_[idx_].entry_name));
380 }
381
382 1041062 pos_in_buf += nbytes;
383 1041062 pos_in_object_ += nbytes;
384
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 1041062 if (nbytes == remaining_in_object) {
385 155912 idx_++;
386 155912 pos_in_object_ = 0;
387 }
388 }
389
390 776312 pos_ += buf_size;
391
392
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 776312 if (idx_ == index_.size())
393
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 1812 state_ = (pos_in_buf == buf_size) ? ObjectPackBuild::kStateDone
394 : ObjectPackBuild::kStateTrailingBytes;
395 else
396 774500 state_ = ObjectPackBuild::kStateContinue;
397 776312 return state_;
398 }
399
400 1862 bool ObjectPackConsumer::ParseHeader() {
401 1862 map<char, string> header;
402 const unsigned char *data = reinterpret_cast<const unsigned char *>(
403 1862 raw_header_.data());
404
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 1862 ParseKeyvalMem(data, raw_header_.size(), &header);
405
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 1862 if (header.find('V') == header.end())
406 ✗ return false;
407
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 1862 if (header['V'] != "2")
408 ✗ return false;
409
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 1862 size_ = String2Uint64(header['S']);
410
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 1862 const unsigned nobjects = String2Uint64(header['N']);
411
412
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 1862 if (nobjects == 0)
413 50 return true;
414
415 // Build the object index
416 1812 const size_t separator_idx = raw_header_.find("--\n");
417
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 1812 if (separator_idx == string::npos)
418 ✗ return false;
419 1812 unsigned index_idx = separator_idx + 3;
420
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 1812 if (index_idx >= raw_header_.size())
421 ✗ return false;
422
423 1812 uint64_t sum_size = 0;
424 do {
425 155912 const unsigned remaining_in_header = raw_header_.size() - index_idx;
426 311824 const string line = GetLineMem(raw_header_.data() + index_idx,
427
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 155912 remaining_in_header);
428
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 155912 if (line == "")
429 ✗ break;
430
431
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 155912 IndexEntry entry;
432
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 155912 if (!ParseItem(line, &entry, &sum_size)) {
433 ✗ break;
434 }
435
436
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 155912 index_.push_back(entry);
437 155912 index_idx += line.size() + 1;
438
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 311824 } while (index_idx < raw_header_.size());
439
440
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 1812 return (nobjects == index_.size()) && (size_ == sum_size);
441 1862 }
442
443 155912 bool ObjectPackConsumer::ParseItem(const std::string &line,
444 ObjectPackConsumer::IndexEntry *entry,
445 uint64_t *sum_size) {
446
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 155912 if (!entry || !sum_size) {
447 ✗ return false;
448 }
449
450
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 155912 if (line[0] == 'C') { // CAS blob
451 155887 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 155887 const size_t separator = line.find(' ', 2);
456
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 155887 if ((separator == string::npos) || (separator == (line.size() - 1))) {
457 ✗ return false;
458 }
459
460
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 155887 const uint64_t size = String2Uint64(line.substr(separator + 1));
461 155887 *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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 155887 const std::string hash_string = line.substr(2, separator - 2);
466 155887 const shash::HexPtr hex_ptr(hash_string);
467
468
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 155887 entry->id = shash::MkFromSuffixedHexPtr(hex_ptr);
469 155887 entry->size = size;
470 155887 entry->entry_type = entry_type;
471
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 155887 entry->entry_name = "";
472
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 155912 } else if (line[0] == 'N') { // Named file
473 25 const ObjectPack::BucketContentType entry_type = ObjectPack::kNamed;
474
475 // First separator, before the size field
476 25 const size_t separator1 = line.find(' ', 2);
477
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 25 if ((separator1 == string::npos) || (separator1 == (line.size() - 1))) {
478 ✗ return false;
479 }
480
481 // Second separator, before the name field
482 25 const size_t separator2 = line.find(' ', separator1 + 1);
483
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 25 if ((separator1 == 0) || (separator1 == string::npos)
484
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 50 || (separator1 == (line.size() - 1))) {
485 ✗ return false;
486 }
487
488
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 25 const uint64_t size = String2Uint64(
489
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 50 line.substr(separator1 + 1, separator2 - separator1 - 1));
490
491 25 std::string name;
492
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 25 if (!Debase64(line.substr(separator2 + 1), &name)) {
493 ✗ return false;
494 }
495
496 25 *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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 25 const std::string hash_string = line.substr(2, separator1 - 2);
501 25 const shash::HexPtr hex_ptr(hash_string);
502
503
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 25 entry->id = shash::MkFromSuffixedHexPtr(hex_ptr);
504 25 entry->size = size;
505 25 entry->entry_type = entry_type;
506
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 25 entry->entry_name = name;
507
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 25 } else { // Error
508 ✗ return false;
509 }
510
511 155912 return true;
512 }
513