1 //===-- llvm/Debuginfod/Debuginfod.cpp - Debuginfod client library --------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file
10 ///
11 /// This file contains several definitions for the debuginfod client and server.
12 /// For the client, this file defines the fetchInfo function. For the server,
13 /// this file defines the DebuginfodLogEntry and DebuginfodServer structs, as
14 /// well as the DebuginfodLog, DebuginfodCollection classes. The fetchInfo
15 /// function retrieves any of the three supported artifact types: (executable,
16 /// debuginfo, source file) associated with a build-id from debuginfod servers.
17 /// If a source file is to be fetched, its absolute path must be specified in
18 /// the Description argument to fetchInfo. The DebuginfodLogEntry,
19 /// DebuginfodLog, and DebuginfodCollection are used by the DebuginfodServer to
20 /// scan the local filesystem for binaries and serve the debuginfod protocol.
21 ///
22 //===----------------------------------------------------------------------===//
23
24 #include "llvm/Debuginfod/Debuginfod.h"
25 #include "llvm/ADT/StringExtras.h"
26 #include "llvm/ADT/StringRef.h"
27 #include "llvm/BinaryFormat/Magic.h"
28 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
29 #include "llvm/DebugInfo/Symbolize/Symbolize.h"
30 #include "llvm/Debuginfod/HTTPClient.h"
31 #include "llvm/Object/BuildID.h"
32 #include "llvm/Object/ELFObjectFile.h"
33 #include "llvm/Support/CachePruning.h"
34 #include "llvm/Support/Caching.h"
35 #include "llvm/Support/Errc.h"
36 #include "llvm/Support/Error.h"
37 #include "llvm/Support/FileUtilities.h"
38 #include "llvm/Support/MemoryBuffer.h"
39 #include "llvm/Support/Path.h"
40 #include "llvm/Support/ThreadPool.h"
41 #include "llvm/Support/xxhash.h"
42
43 #include <atomic>
44 #include <optional>
45 #include <thread>
46
47 namespace llvm {
48
49 using llvm::object::BuildIDRef;
50
51 namespace {
52 std::optional<SmallVector<StringRef>> DebuginfodUrls;
53 // Many Readers/Single Writer lock protecting the global debuginfod URL list.
54 llvm::sys::RWMutex UrlsMutex;
55 } // namespace
56
getDebuginfodCacheKey(llvm::StringRef S)57 std::string getDebuginfodCacheKey(llvm::StringRef S) {
58 return utostr(xxh3_64bits(S));
59 }
60
61 // Returns a binary BuildID as a normalized hex string.
62 // Uses lowercase for compatibility with common debuginfod servers.
buildIDToString(BuildIDRef ID)63 static std::string buildIDToString(BuildIDRef ID) {
64 return llvm::toHex(ID, /*LowerCase=*/true);
65 }
66
canUseDebuginfod()67 bool canUseDebuginfod() {
68 return HTTPClient::isAvailable() && !getDefaultDebuginfodUrls().empty();
69 }
70
getDefaultDebuginfodUrls()71 SmallVector<StringRef> getDefaultDebuginfodUrls() {
72 std::shared_lock<llvm::sys::RWMutex> ReadGuard(UrlsMutex);
73 if (!DebuginfodUrls) {
74 // Only read from the environment variable if the user hasn't already
75 // set the value.
76 ReadGuard.unlock();
77 std::unique_lock<llvm::sys::RWMutex> WriteGuard(UrlsMutex);
78 DebuginfodUrls = SmallVector<StringRef>();
79 if (const char *DebuginfodUrlsEnv = std::getenv("DEBUGINFOD_URLS")) {
80 StringRef(DebuginfodUrlsEnv)
81 .split(DebuginfodUrls.value(), " ", -1, false);
82 }
83 WriteGuard.unlock();
84 ReadGuard.lock();
85 }
86 return DebuginfodUrls.value();
87 }
88
89 // Set the default debuginfod URL list, override the environment variable.
setDefaultDebuginfodUrls(const SmallVector<StringRef> & URLs)90 void setDefaultDebuginfodUrls(const SmallVector<StringRef> &URLs) {
91 std::unique_lock<llvm::sys::RWMutex> WriteGuard(UrlsMutex);
92 DebuginfodUrls = URLs;
93 }
94
95 /// Finds a default local file caching directory for the debuginfod client,
96 /// first checking DEBUGINFOD_CACHE_PATH.
getDefaultDebuginfodCacheDirectory()97 Expected<std::string> getDefaultDebuginfodCacheDirectory() {
98 if (const char *CacheDirectoryEnv = std::getenv("DEBUGINFOD_CACHE_PATH"))
99 return CacheDirectoryEnv;
100
101 SmallString<64> CacheDirectory;
102 if (!sys::path::cache_directory(CacheDirectory))
103 return createStringError(
104 errc::io_error, "Unable to determine appropriate cache directory.");
105 sys::path::append(CacheDirectory, "llvm-debuginfod", "client");
106 return std::string(CacheDirectory);
107 }
108
getDefaultDebuginfodTimeout()109 std::chrono::milliseconds getDefaultDebuginfodTimeout() {
110 long Timeout;
111 const char *DebuginfodTimeoutEnv = std::getenv("DEBUGINFOD_TIMEOUT");
112 if (DebuginfodTimeoutEnv &&
113 to_integer(StringRef(DebuginfodTimeoutEnv).trim(), Timeout, 10))
114 return std::chrono::milliseconds(Timeout * 1000);
115
116 return std::chrono::milliseconds(90 * 1000);
117 }
118
119 /// The following functions fetch a debuginfod artifact to a file in a local
120 /// cache and return the cached file path. They first search the local cache,
121 /// followed by the debuginfod servers.
122
getDebuginfodSourceUrlPath(BuildIDRef ID,StringRef SourceFilePath)123 std::string getDebuginfodSourceUrlPath(BuildIDRef ID,
124 StringRef SourceFilePath) {
125 SmallString<64> UrlPath;
126 sys::path::append(UrlPath, sys::path::Style::posix, "buildid",
127 buildIDToString(ID), "source",
128 sys::path::convert_to_slash(SourceFilePath));
129 return std::string(UrlPath);
130 }
131
getCachedOrDownloadSource(BuildIDRef ID,StringRef SourceFilePath)132 Expected<std::string> getCachedOrDownloadSource(BuildIDRef ID,
133 StringRef SourceFilePath) {
134 std::string UrlPath = getDebuginfodSourceUrlPath(ID, SourceFilePath);
135 return getCachedOrDownloadArtifact(getDebuginfodCacheKey(UrlPath), UrlPath);
136 }
137
getDebuginfodExecutableUrlPath(BuildIDRef ID)138 std::string getDebuginfodExecutableUrlPath(BuildIDRef ID) {
139 SmallString<64> UrlPath;
140 sys::path::append(UrlPath, sys::path::Style::posix, "buildid",
141 buildIDToString(ID), "executable");
142 return std::string(UrlPath);
143 }
144
getCachedOrDownloadExecutable(BuildIDRef ID)145 Expected<std::string> getCachedOrDownloadExecutable(BuildIDRef ID) {
146 std::string UrlPath = getDebuginfodExecutableUrlPath(ID);
147 return getCachedOrDownloadArtifact(getDebuginfodCacheKey(UrlPath), UrlPath);
148 }
149
getDebuginfodDebuginfoUrlPath(BuildIDRef ID)150 std::string getDebuginfodDebuginfoUrlPath(BuildIDRef ID) {
151 SmallString<64> UrlPath;
152 sys::path::append(UrlPath, sys::path::Style::posix, "buildid",
153 buildIDToString(ID), "debuginfo");
154 return std::string(UrlPath);
155 }
156
getCachedOrDownloadDebuginfo(BuildIDRef ID)157 Expected<std::string> getCachedOrDownloadDebuginfo(BuildIDRef ID) {
158 std::string UrlPath = getDebuginfodDebuginfoUrlPath(ID);
159 return getCachedOrDownloadArtifact(getDebuginfodCacheKey(UrlPath), UrlPath);
160 }
161
162 // General fetching function.
getCachedOrDownloadArtifact(StringRef UniqueKey,StringRef UrlPath)163 Expected<std::string> getCachedOrDownloadArtifact(StringRef UniqueKey,
164 StringRef UrlPath) {
165 SmallString<10> CacheDir;
166
167 Expected<std::string> CacheDirOrErr = getDefaultDebuginfodCacheDirectory();
168 if (!CacheDirOrErr)
169 return CacheDirOrErr.takeError();
170 CacheDir = *CacheDirOrErr;
171
172 return getCachedOrDownloadArtifact(UniqueKey, UrlPath, CacheDir,
173 getDefaultDebuginfodUrls(),
174 getDefaultDebuginfodTimeout());
175 }
176
177 namespace {
178
179 /// A simple handler which streams the returned data to a cache file. The cache
180 /// file is only created if a 200 OK status is observed.
181 class StreamedHTTPResponseHandler : public HTTPResponseHandler {
182 using CreateStreamFn =
183 std::function<Expected<std::unique_ptr<CachedFileStream>>()>;
184 CreateStreamFn CreateStream;
185 HTTPClient &Client;
186 std::unique_ptr<CachedFileStream> FileStream;
187
188 public:
StreamedHTTPResponseHandler(CreateStreamFn CreateStream,HTTPClient & Client)189 StreamedHTTPResponseHandler(CreateStreamFn CreateStream, HTTPClient &Client)
190 : CreateStream(CreateStream), Client(Client) {}
191 virtual ~StreamedHTTPResponseHandler() = default;
192
193 Error handleBodyChunk(StringRef BodyChunk) override;
194 };
195
196 } // namespace
197
handleBodyChunk(StringRef BodyChunk)198 Error StreamedHTTPResponseHandler::handleBodyChunk(StringRef BodyChunk) {
199 if (!FileStream) {
200 unsigned Code = Client.responseCode();
201 if (Code && Code != 200)
202 return Error::success();
203 Expected<std::unique_ptr<CachedFileStream>> FileStreamOrError =
204 CreateStream();
205 if (!FileStreamOrError)
206 return FileStreamOrError.takeError();
207 FileStream = std::move(*FileStreamOrError);
208 }
209 *FileStream->OS << BodyChunk;
210 return Error::success();
211 }
212
213 // An over-accepting simplification of the HTTP RFC 7230 spec.
isHeader(StringRef S)214 static bool isHeader(StringRef S) {
215 StringRef Name;
216 StringRef Value;
217 std::tie(Name, Value) = S.split(':');
218 if (Name.empty() || Value.empty())
219 return false;
220 return all_of(Name, [](char C) { return llvm::isPrint(C) && C != ' '; }) &&
221 all_of(Value, [](char C) { return llvm::isPrint(C) || C == '\t'; });
222 }
223
getHeaders()224 static SmallVector<std::string, 0> getHeaders() {
225 const char *Filename = getenv("DEBUGINFOD_HEADERS_FILE");
226 if (!Filename)
227 return {};
228 ErrorOr<std::unique_ptr<MemoryBuffer>> HeadersFile =
229 MemoryBuffer::getFile(Filename, /*IsText=*/true);
230 if (!HeadersFile)
231 return {};
232
233 SmallVector<std::string, 0> Headers;
234 uint64_t LineNumber = 0;
235 for (StringRef Line : llvm::split((*HeadersFile)->getBuffer(), '\n')) {
236 LineNumber++;
237 if (!Line.empty() && Line.back() == '\r')
238 Line = Line.drop_back();
239 if (!isHeader(Line)) {
240 if (!all_of(Line, llvm::isSpace))
241 WithColor::warning()
242 << "could not parse debuginfod header: " << Filename << ':'
243 << LineNumber << '\n';
244 continue;
245 }
246 Headers.emplace_back(Line);
247 }
248 return Headers;
249 }
250
getCachedOrDownloadArtifact(StringRef UniqueKey,StringRef UrlPath,StringRef CacheDirectoryPath,ArrayRef<StringRef> DebuginfodUrls,std::chrono::milliseconds Timeout)251 Expected<std::string> getCachedOrDownloadArtifact(
252 StringRef UniqueKey, StringRef UrlPath, StringRef CacheDirectoryPath,
253 ArrayRef<StringRef> DebuginfodUrls, std::chrono::milliseconds Timeout) {
254 SmallString<64> AbsCachedArtifactPath;
255 sys::path::append(AbsCachedArtifactPath, CacheDirectoryPath,
256 "llvmcache-" + UniqueKey);
257
258 Expected<FileCache> CacheOrErr =
259 localCache("Debuginfod-client", ".debuginfod-client", CacheDirectoryPath);
260 if (!CacheOrErr)
261 return CacheOrErr.takeError();
262
263 FileCache Cache = *CacheOrErr;
264 // We choose an arbitrary Task parameter as we do not make use of it.
265 unsigned Task = 0;
266 Expected<AddStreamFn> CacheAddStreamOrErr = Cache(Task, UniqueKey, "");
267 if (!CacheAddStreamOrErr)
268 return CacheAddStreamOrErr.takeError();
269 AddStreamFn &CacheAddStream = *CacheAddStreamOrErr;
270 if (!CacheAddStream)
271 return std::string(AbsCachedArtifactPath);
272 // The artifact was not found in the local cache, query the debuginfod
273 // servers.
274 if (!HTTPClient::isAvailable())
275 return createStringError(errc::io_error,
276 "No working HTTP client is available.");
277
278 if (!HTTPClient::IsInitialized)
279 return createStringError(
280 errc::io_error,
281 "A working HTTP client is available, but it is not initialized. To "
282 "allow Debuginfod to make HTTP requests, call HTTPClient::initialize() "
283 "at the beginning of main.");
284
285 HTTPClient Client;
286 Client.setTimeout(Timeout);
287 for (StringRef ServerUrl : DebuginfodUrls) {
288 SmallString<64> ArtifactUrl;
289 sys::path::append(ArtifactUrl, sys::path::Style::posix, ServerUrl, UrlPath);
290
291 // Perform the HTTP request and if successful, write the response body to
292 // the cache.
293 {
294 StreamedHTTPResponseHandler Handler(
295 [&]() { return CacheAddStream(Task, ""); }, Client);
296 HTTPRequest Request(ArtifactUrl);
297 Request.Headers = getHeaders();
298 Error Err = Client.perform(Request, Handler);
299 if (Err)
300 return std::move(Err);
301
302 unsigned Code = Client.responseCode();
303 if (Code && Code != 200)
304 continue;
305 }
306
307 Expected<CachePruningPolicy> PruningPolicyOrErr =
308 parseCachePruningPolicy(std::getenv("DEBUGINFOD_CACHE_POLICY"));
309 if (!PruningPolicyOrErr)
310 return PruningPolicyOrErr.takeError();
311 pruneCache(CacheDirectoryPath, *PruningPolicyOrErr);
312
313 // Return the path to the artifact on disk.
314 return std::string(AbsCachedArtifactPath);
315 }
316
317 return createStringError(errc::argument_out_of_domain, "build id not found");
318 }
319
DebuginfodLogEntry(const Twine & Message)320 DebuginfodLogEntry::DebuginfodLogEntry(const Twine &Message)
321 : Message(Message.str()) {}
322
push(const Twine & Message)323 void DebuginfodLog::push(const Twine &Message) {
324 push(DebuginfodLogEntry(Message));
325 }
326
push(DebuginfodLogEntry Entry)327 void DebuginfodLog::push(DebuginfodLogEntry Entry) {
328 {
329 std::lock_guard<std::mutex> Guard(QueueMutex);
330 LogEntryQueue.push(Entry);
331 }
332 QueueCondition.notify_one();
333 }
334
pop()335 DebuginfodLogEntry DebuginfodLog::pop() {
336 {
337 std::unique_lock<std::mutex> Guard(QueueMutex);
338 // Wait for messages to be pushed into the queue.
339 QueueCondition.wait(Guard, [&] { return !LogEntryQueue.empty(); });
340 }
341 std::lock_guard<std::mutex> Guard(QueueMutex);
342 if (!LogEntryQueue.size())
343 llvm_unreachable("Expected message in the queue.");
344
345 DebuginfodLogEntry Entry = LogEntryQueue.front();
346 LogEntryQueue.pop();
347 return Entry;
348 }
349
DebuginfodCollection(ArrayRef<StringRef> PathsRef,DebuginfodLog & Log,ThreadPoolInterface & Pool,double MinInterval)350 DebuginfodCollection::DebuginfodCollection(ArrayRef<StringRef> PathsRef,
351 DebuginfodLog &Log,
352 ThreadPoolInterface &Pool,
353 double MinInterval)
354 : Log(Log), Pool(Pool), MinInterval(MinInterval) {
355 for (StringRef Path : PathsRef)
356 Paths.push_back(Path.str());
357 }
358
update()359 Error DebuginfodCollection::update() {
360 std::lock_guard<sys::Mutex> Guard(UpdateMutex);
361 if (UpdateTimer.isRunning())
362 UpdateTimer.stopTimer();
363 UpdateTimer.clear();
364 for (const std::string &Path : Paths) {
365 Log.push("Updating binaries at path " + Path);
366 if (Error Err = findBinaries(Path))
367 return Err;
368 }
369 Log.push("Updated collection");
370 UpdateTimer.startTimer();
371 return Error::success();
372 }
373
updateIfStale()374 Expected<bool> DebuginfodCollection::updateIfStale() {
375 if (!UpdateTimer.isRunning())
376 return false;
377 UpdateTimer.stopTimer();
378 double Time = UpdateTimer.getTotalTime().getWallTime();
379 UpdateTimer.startTimer();
380 if (Time < MinInterval)
381 return false;
382 if (Error Err = update())
383 return std::move(Err);
384 return true;
385 }
386
updateForever(std::chrono::milliseconds Interval)387 Error DebuginfodCollection::updateForever(std::chrono::milliseconds Interval) {
388 while (true) {
389 if (Error Err = update())
390 return Err;
391 std::this_thread::sleep_for(Interval);
392 }
393 llvm_unreachable("updateForever loop should never end");
394 }
395
hasELFMagic(StringRef FilePath)396 static bool hasELFMagic(StringRef FilePath) {
397 file_magic Type;
398 std::error_code EC = identify_magic(FilePath, Type);
399 if (EC)
400 return false;
401 switch (Type) {
402 case file_magic::elf:
403 case file_magic::elf_relocatable:
404 case file_magic::elf_executable:
405 case file_magic::elf_shared_object:
406 case file_magic::elf_core:
407 return true;
408 default:
409 return false;
410 }
411 }
412
findBinaries(StringRef Path)413 Error DebuginfodCollection::findBinaries(StringRef Path) {
414 std::error_code EC;
415 sys::fs::recursive_directory_iterator I(Twine(Path), EC), E;
416 std::mutex IteratorMutex;
417 ThreadPoolTaskGroup IteratorGroup(Pool);
418 for (unsigned WorkerIndex = 0; WorkerIndex < Pool.getMaxConcurrency();
419 WorkerIndex++) {
420 IteratorGroup.async([&, this]() -> void {
421 std::string FilePath;
422 while (true) {
423 {
424 // Check if iteration is over or there is an error during iteration
425 std::lock_guard<std::mutex> Guard(IteratorMutex);
426 if (I == E || EC)
427 return;
428 // Grab a file path from the directory iterator and advance the
429 // iterator.
430 FilePath = I->path();
431 I.increment(EC);
432 }
433
434 // Inspect the file at this path to determine if it is debuginfo.
435 if (!hasELFMagic(FilePath))
436 continue;
437
438 Expected<object::OwningBinary<object::Binary>> BinOrErr =
439 object::createBinary(FilePath);
440
441 if (!BinOrErr) {
442 consumeError(BinOrErr.takeError());
443 continue;
444 }
445 object::Binary *Bin = std::move(BinOrErr.get().getBinary());
446 if (!Bin->isObject())
447 continue;
448
449 // TODO: Support non-ELF binaries
450 object::ELFObjectFileBase *Object =
451 dyn_cast<object::ELFObjectFileBase>(Bin);
452 if (!Object)
453 continue;
454
455 BuildIDRef ID = getBuildID(Object);
456 if (ID.empty())
457 continue;
458
459 std::string IDString = buildIDToString(ID);
460 if (Object->hasDebugInfo()) {
461 std::lock_guard<sys::RWMutex> DebugBinariesGuard(DebugBinariesMutex);
462 (void)DebugBinaries.try_emplace(IDString, std::move(FilePath));
463 } else {
464 std::lock_guard<sys::RWMutex> BinariesGuard(BinariesMutex);
465 (void)Binaries.try_emplace(IDString, std::move(FilePath));
466 }
467 }
468 });
469 }
470 IteratorGroup.wait();
471 std::unique_lock<std::mutex> Guard(IteratorMutex);
472 if (EC)
473 return errorCodeToError(EC);
474 return Error::success();
475 }
476
477 Expected<std::optional<std::string>>
getBinaryPath(BuildIDRef ID)478 DebuginfodCollection::getBinaryPath(BuildIDRef ID) {
479 Log.push("getting binary path of ID " + buildIDToString(ID));
480 std::shared_lock<sys::RWMutex> Guard(BinariesMutex);
481 auto Loc = Binaries.find(buildIDToString(ID));
482 if (Loc != Binaries.end()) {
483 std::string Path = Loc->getValue();
484 return Path;
485 }
486 return std::nullopt;
487 }
488
489 Expected<std::optional<std::string>>
getDebugBinaryPath(BuildIDRef ID)490 DebuginfodCollection::getDebugBinaryPath(BuildIDRef ID) {
491 Log.push("getting debug binary path of ID " + buildIDToString(ID));
492 std::shared_lock<sys::RWMutex> Guard(DebugBinariesMutex);
493 auto Loc = DebugBinaries.find(buildIDToString(ID));
494 if (Loc != DebugBinaries.end()) {
495 std::string Path = Loc->getValue();
496 return Path;
497 }
498 return std::nullopt;
499 }
500
findBinaryPath(BuildIDRef ID)501 Expected<std::string> DebuginfodCollection::findBinaryPath(BuildIDRef ID) {
502 {
503 // Check collection; perform on-demand update if stale.
504 Expected<std::optional<std::string>> PathOrErr = getBinaryPath(ID);
505 if (!PathOrErr)
506 return PathOrErr.takeError();
507 std::optional<std::string> Path = *PathOrErr;
508 if (!Path) {
509 Expected<bool> UpdatedOrErr = updateIfStale();
510 if (!UpdatedOrErr)
511 return UpdatedOrErr.takeError();
512 if (*UpdatedOrErr) {
513 // Try once more.
514 PathOrErr = getBinaryPath(ID);
515 if (!PathOrErr)
516 return PathOrErr.takeError();
517 Path = *PathOrErr;
518 }
519 }
520 if (Path)
521 return *Path;
522 }
523
524 // Try federation.
525 Expected<std::string> PathOrErr = getCachedOrDownloadExecutable(ID);
526 if (!PathOrErr)
527 consumeError(PathOrErr.takeError());
528
529 // Fall back to debug binary.
530 return findDebugBinaryPath(ID);
531 }
532
findDebugBinaryPath(BuildIDRef ID)533 Expected<std::string> DebuginfodCollection::findDebugBinaryPath(BuildIDRef ID) {
534 // Check collection; perform on-demand update if stale.
535 Expected<std::optional<std::string>> PathOrErr = getDebugBinaryPath(ID);
536 if (!PathOrErr)
537 return PathOrErr.takeError();
538 std::optional<std::string> Path = *PathOrErr;
539 if (!Path) {
540 Expected<bool> UpdatedOrErr = updateIfStale();
541 if (!UpdatedOrErr)
542 return UpdatedOrErr.takeError();
543 if (*UpdatedOrErr) {
544 // Try once more.
545 PathOrErr = getBinaryPath(ID);
546 if (!PathOrErr)
547 return PathOrErr.takeError();
548 Path = *PathOrErr;
549 }
550 }
551 if (Path)
552 return *Path;
553
554 // Try federation.
555 return getCachedOrDownloadDebuginfo(ID);
556 }
557
DebuginfodServer(DebuginfodLog & Log,DebuginfodCollection & Collection)558 DebuginfodServer::DebuginfodServer(DebuginfodLog &Log,
559 DebuginfodCollection &Collection)
560 : Log(Log), Collection(Collection) {
561 cantFail(
562 Server.get(R"(/buildid/(.*)/debuginfo)", [&](HTTPServerRequest Request) {
563 Log.push("GET " + Request.UrlPath);
564 std::string IDString;
565 if (!tryGetFromHex(Request.UrlPathMatches[0], IDString)) {
566 Request.setResponse(
567 {404, "text/plain", "Build ID is not a hex string\n"});
568 return;
569 }
570 object::BuildID ID(IDString.begin(), IDString.end());
571 Expected<std::string> PathOrErr = Collection.findDebugBinaryPath(ID);
572 if (Error Err = PathOrErr.takeError()) {
573 consumeError(std::move(Err));
574 Request.setResponse({404, "text/plain", "Build ID not found\n"});
575 return;
576 }
577 streamFile(Request, *PathOrErr);
578 }));
579 cantFail(
580 Server.get(R"(/buildid/(.*)/executable)", [&](HTTPServerRequest Request) {
581 Log.push("GET " + Request.UrlPath);
582 std::string IDString;
583 if (!tryGetFromHex(Request.UrlPathMatches[0], IDString)) {
584 Request.setResponse(
585 {404, "text/plain", "Build ID is not a hex string\n"});
586 return;
587 }
588 object::BuildID ID(IDString.begin(), IDString.end());
589 Expected<std::string> PathOrErr = Collection.findBinaryPath(ID);
590 if (Error Err = PathOrErr.takeError()) {
591 consumeError(std::move(Err));
592 Request.setResponse({404, "text/plain", "Build ID not found\n"});
593 return;
594 }
595 streamFile(Request, *PathOrErr);
596 }));
597 }
598
599 } // namespace llvm
600