private void installFiles(
String filesType,
ImmutableMap<String, Path> filesToInstallByHash,
String metadataFileContents,
String filenameFormat,
Path destinationDirRelativeToDataRoot)
throws Exception {
try (TraceEventLogger ignored1 =
TraceEventLogger.start(eventBus, "multi_install_" + filesType)) {
device.createForward(agentPort, agentPort);
try {
for (Map.Entry<String, Path> entry : filesToInstallByHash.entrySet()) {
Path destination =
destinationDirRelativeToDataRoot.resolve(
String.format(filenameFormat, entry.getKey()));
Path source = entry.getValue();
try (TraceEventLogger ignored2 =
TraceEventLogger.start(eventBus, "install_" + filesType)) {
installFile(device, agentPort, destination, source);
}
}
try (TraceEventLogger ignored3 =
TraceEventLogger.start(eventBus, "install_" + filesType + "_metadata")) {
try (NamedTemporaryFile temp = new NamedTemporaryFile("metadata", "tmp")) {
com.google.common.io.Files.write(
metadataFileContents.getBytes(Charsets.UTF_8), temp.get().toFile());
installFile(
device,
agentPort,
destinationDirRelativeToDataRoot.resolve("metadata.txt"),
temp.get());
}
}
} finally {
try {
device.removeForward(agentPort, agentPort);
} catch (AdbCommandRejectedException e) {
LOG.warn(e, "Failed to remove adb forward on port %d for device %s", agentPort, device);
eventBus.post(
ConsoleEvent.warning(
"Failed to remove adb forward %d. This is not necessarily a problem\n"
+ "because it will be recreated during the next exopackage installation.\n"
+ "See the log for the full exception.",
agentPort));
}
}
}
}
@Override
public ImmutableList<Step> getBuildSteps(
BuildContext context, BuildableContext buildableContext) {
ImmutableList.Builder<Step> commands = ImmutableList.builder();
commands.add(new MakeCleanDirectoryStep(getProjectFilesystem(), genPath));
BuildTarget target = getBuildTarget();
Path outputDirectory = BuildTargets.getScratchPath(target, "__%s.aidl");
commands.add(new MakeCleanDirectoryStep(getProjectFilesystem(), outputDirectory));
AidlStep command =
new AidlStep(
getProjectFilesystem(),
target,
getResolver().getAbsolutePath(aidlFilePath),
ImmutableSet.of(importPath),
outputDirectory);
commands.add(command);
// Files must ultimately be written to GEN_DIR to be used as source paths.
Path genDirectory = Paths.get(BuckConstant.GEN_DIR, importPath);
// Warn the user if the genDirectory is not under the output directory.
if (!importPath.startsWith(target.getBasePath().toString())) {
// TODO(shs96c): Make this fatal. Give people some time to clean up their rules.
context
.getEventBus()
.post(
ConsoleEvent.warning(
"%s, gen_aidl import path (%s) should be a child of %s",
target, importPath, target.getBasePath()));
}
commands.add(new MkdirStep(getProjectFilesystem(), genDirectory));
commands.add(
new JarDirectoryStep(
getProjectFilesystem(),
output,
ImmutableSortedSet.of(outputDirectory),
/* main class */ null,
/* manifest */ null));
buildableContext.recordArtifact(output);
return commands.build();
}
private CacheResult tryToFetchArtifactFromBuildCacheAndOverlayOnTopOfProjectFilesystem(
BuildRule rule,
RuleKey ruleKey,
BuildInfoRecorder buildInfoRecorder,
ArtifactCache artifactCache,
ProjectFilesystem filesystem,
BuildContext buildContext)
throws InterruptedException {
// Create a temp file whose extension must be ".zip" for Filesystems.newFileSystem() to infer
// that we are creating a zip-based FileSystem.
Path zipFile;
try {
zipFile =
Files.createTempFile(
"buck_artifact_" + MoreFiles.sanitize(rule.getBuildTarget().getShortName()), ".zip");
} catch (IOException e) {
throw new RuntimeException(e);
}
// TODO(mbolin): Change ArtifactCache.fetch() so that it returns a File instead of takes one.
// Then we could download directly from the remote cache into the on-disk cache and unzip it
// from there.
CacheResult cacheResult =
buildInfoRecorder.fetchArtifactForBuildable(ruleKey, zipFile, artifactCache);
if (!cacheResult.getType().isSuccess()) {
try {
Files.delete(zipFile);
} catch (IOException e) {
LOG.warn(e, "failed to delete %s", zipFile);
}
return cacheResult;
}
// We unzip the file in the root of the project directory.
// Ideally, the following would work:
//
// Path pathToZip = Paths.get(zipFile.getAbsolutePath());
// FileSystem fs = FileSystems.newFileSystem(pathToZip, /* loader */ null);
// Path root = Iterables.getOnlyElement(fs.getRootDirectories());
// MoreFiles.copyRecursively(root, projectRoot);
//
// Unfortunately, this does not appear to work, in practice, because MoreFiles fails when trying
// to resolve a Path for a zip entry against a file Path on disk.
ArtifactCacheEvent.Started started =
ArtifactCacheEvent.started(
ArtifactCacheEvent.Operation.DECOMPRESS, ImmutableSet.of(ruleKey));
buildContext.getEventBus().post(started);
try {
Unzip.extractZipFile(
zipFile.toAbsolutePath(),
filesystem,
Unzip.ExistingFileMode.OVERWRITE_AND_CLEAN_DIRECTORIES);
// We only delete the ZIP file when it has been unzipped successfully. Otherwise, we leave it
// around for debugging purposes.
Files.delete(zipFile);
if (cacheResult.getType() == CacheResult.Type.HIT) {
// If we have a hit, also write out the build metadata.
Path metadataDir = BuildInfo.getPathToMetadataDirectory(rule.getBuildTarget());
for (Map.Entry<String, String> ent : cacheResult.getMetadata().entrySet()) {
Path dest = metadataDir.resolve(ent.getKey());
filesystem.createParentDirs(dest);
filesystem.writeContentsToPath(ent.getValue(), dest);
}
}
} catch (IOException e) {
// In the wild, we have seen some inexplicable failures during this step. For now, we try to
// give the user as much information as we can to debug the issue, but return CacheResult.MISS
// so that Buck will fall back on doing a local build.
buildContext
.getEventBus()
.post(
ConsoleEvent.warning(
"Failed to unzip the artifact for %s at %s.\n"
+ "The rule will be built locally, "
+ "but here is the stacktrace of the failed unzip call:\n"
+ rule.getBuildTarget(),
zipFile.toAbsolutePath(),
Throwables.getStackTraceAsString(e)));
return CacheResult.miss();
} finally {
buildContext.getEventBus().post(ArtifactCacheEvent.finished(started));
}
return cacheResult;
}
/**
* Query Watchman for file change events. If too many events are pending or an error occurs an
* overflow event is posted to the EventBus signalling that events may have been lost (and so
* typically caches must be cleared to avoid inconsistency). Interruptions and IOExceptions are
* propagated to callers, but typically if overflow events are handled conservatively by
* subscribers then no other remedial action is required.
*/
@Override
public void postEvents(BuckEventBus buckEventBus) throws IOException, InterruptedException {
ProcessExecutor.LaunchedProcess watchmanProcess =
processExecutor.launchProcess(
ProcessExecutorParams.builder()
.addCommand("watchman", "--server-encoding=json", "--no-pretty", "-j")
.build());
try {
LOG.debug("Writing query to Watchman: %s", query);
watchmanProcess.getOutputStream().write(query.getBytes(Charsets.US_ASCII));
watchmanProcess.getOutputStream().close();
LOG.debug("Parsing JSON output from Watchman");
final long parseStartTimeMillis = clock.currentTimeMillis();
InputStream jsonInput = watchmanProcess.getInputStream();
if (LOG.isVerboseEnabled()) {
byte[] fullResponse = ByteStreams.toByteArray(jsonInput);
jsonInput.close();
jsonInput = new ByteArrayInputStream(fullResponse);
LOG.verbose("Full JSON: " + new String(fullResponse, Charsets.UTF_8).trim());
}
JsonParser jsonParser = objectMapper.getJsonFactory().createJsonParser(jsonInput);
PathEventBuilder builder = new PathEventBuilder();
JsonToken token = jsonParser.nextToken();
/*
* Watchman returns changes as an array of JSON objects with potentially unstable key
* ordering:
* {
* "files": [
* {
* "new": false,
* "exists": true,
* "name": "bin/buckd",
* },
* ]
* }
* A simple way to parse these changes is to collect the relevant values from each object
* in a builder and then build an event when the end of a JSON object is reached. When the end
* of the enclosing JSON object is processed the builder will not contain a complete event, so
* the object end token will be ignored.
*/
int eventCount = 0;
while (token != null) {
boolean shouldOverflow = false;
if (eventCount > overflow) {
LOG.warn(
"Received too many events from Watchmen (%d > overflow max %d), posting overflow "
+ "event and giving up.",
eventCount, overflow);
shouldOverflow = true;
} else {
long elapsedMillis = clock.currentTimeMillis() - parseStartTimeMillis;
if (elapsedMillis >= timeoutMillis) {
LOG.warn(
"Parsing took too long (timeout %d ms), posting overflow event and giving up.",
timeoutMillis);
shouldOverflow = true;
}
}
if (shouldOverflow) {
postWatchEvent(createOverflowEvent());
processExecutor.destroyLaunchedProcess(watchmanProcess);
processExecutor.waitForLaunchedProcess(watchmanProcess);
return;
}
switch (token) {
case FIELD_NAME:
String fieldName = jsonParser.getCurrentName();
switch (fieldName) {
case "is_fresh_instance":
// Force caches to be invalidated --- we have no idea what's happening.
Boolean newInstance = jsonParser.nextBooleanValue();
if (newInstance) {
LOG.info(
"Fresh watchman instance detected. "
+ "Posting overflow event to flush caches.");
postWatchEvent(createOverflowEvent());
}
break;
case "name":
builder.setPath(Paths.get(jsonParser.nextTextValue()));
break;
case "new":
if (jsonParser.nextBooleanValue()) {
builder.setCreationEvent();
}
break;
case "exists":
if (!jsonParser.nextBooleanValue()) {
builder.setDeletionEvent();
}
break;
case "error":
WatchmanWatcherException e =
new WatchmanWatcherException(jsonParser.nextTextValue());
LOG.error(
e, "Error in Watchman output. Posting an overflow event to flush the caches");
postWatchEvent(createOverflowEvent());
throw e;
case "warning":
String message = jsonParser.nextTextValue();
buckEventBus.post(
ConsoleEvent.warning("Watchman has produced a warning: %s", message));
LOG.warn("Watchman has produced a warning: %s", message);
break;
}
break;
case END_OBJECT:
if (builder.canBuild()) {
postWatchEvent(builder.build());
++eventCount;
}
builder = new PathEventBuilder();
break;
// $CASES-OMITTED$
default:
break;
}
token = jsonParser.nextToken();
}
int watchmanExitCode;
LOG.debug("Posted %d Watchman events. Waiting for subprocess to exit...", eventCount);
watchmanExitCode = processExecutor.waitForLaunchedProcess(watchmanProcess);
if (watchmanExitCode != 0) {
LOG.error("Watchman exited with error code %d", watchmanExitCode);
postWatchEvent(createOverflowEvent()); // Events may have been lost, signal overflow.
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
ByteStreams.copy(watchmanProcess.getErrorStream(), buffer);
throw new WatchmanWatcherException(
"Watchman failed with exit code " + watchmanExitCode + ": " + buffer.toString());
} else {
LOG.debug("Watchman exited cleanly.");
}
} catch (InterruptedException e) {
LOG.warn(e, "Killing Watchman process on interrupted exception");
postWatchEvent(createOverflowEvent()); // Events may have been lost, signal overflow.
processExecutor.destroyLaunchedProcess(watchmanProcess);
processExecutor.waitForLaunchedProcess(watchmanProcess);
Thread.currentThread().interrupt();
throw e;
} catch (IOException e) {
LOG.error(e, "Killing Watchman process on I/O exception");
postWatchEvent(createOverflowEvent()); // Events may have been lost, signal overflow.
processExecutor.destroyLaunchedProcess(watchmanProcess);
processExecutor.waitForLaunchedProcess(watchmanProcess);
throw e;
}
}