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Keep credentials cached across build commands.
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When using a credential helper, the lifetime of the credential cache is currently tied to an individual command, which causes the helper to be called for every command resulting in poor incremental build latency for builds using a non-trivial helper.

Since the cache must be shared by RemoteModule and BazelBuildServiceModule, I've introduced a new CredentialModule whose sole purpose is to provide access to it.

Closes bazelbuild#16822.

PiperOrigin-RevId: 491598103
Change-Id: Ib668954b635a0e9498f0a7418707d6a2dfae0265
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tjgq authored and copybara-github committed Nov 29, 2022
1 parent 31e4bf4 commit 2baa5a4
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Showing 22 changed files with 328 additions and 146 deletions.
Original file line number Diff line number Diff line change
Expand Up @@ -175,7 +175,11 @@ public class AuthAndTLSOptions extends OptionsBase {
converter = DurationConverter.class,
documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
effectTags = {OptionEffectTag.UNKNOWN},
help = "Configures the duration for which credentials from Credential Helpers are cached.")
help =
"Configures the duration for which credentials from Credential Helpers are cached.\n\n"
+ "Invoking with a different value will adjust the lifetime of preexisting entries;"
+ " pass zero to clear the cache. A clean command always clears the cache, regardless"
+ " of this flag.")
public Duration credentialHelperCacheTimeout;

/** One of the values of the `--credential_helper` flag. */
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ java_library(
"//src/main/java/com/google/devtools/common/options",
"//third_party:auth",
"//third_party:auto_value",
"//third_party:caffeine",
"//third_party:guava",
"//third_party:jsr305",
"//third_party:netty",
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Original file line number Diff line number Diff line change
Expand Up @@ -14,11 +14,14 @@

package com.google.devtools.build.lib.authandtls;

import com.github.benmanes.caffeine.cache.Cache;
import com.google.auth.Credentials;
import com.google.auth.oauth2.GoogleCredentials;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.authandtls.credentialhelper.CredentialHelperCredentials;
import com.google.devtools.build.lib.authandtls.credentialhelper.CredentialHelperEnvironment;
import com.google.devtools.build.lib.authandtls.credentialhelper.CredentialHelperProvider;
Expand Down Expand Up @@ -48,6 +51,7 @@
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.util.List;
import java.util.Map;
import java.util.Optional;
Expand Down Expand Up @@ -248,6 +252,7 @@ public static CallCredentialsProvider newCallCredentialsProvider(@Nullable Crede
*/
public static Credentials newCredentials(
CredentialHelperEnvironment credentialHelperEnvironment,
Cache<URI, ImmutableMap<String, ImmutableList<String>>> credentialCache,
CommandLinePathFactory commandLinePathFactory,
FileSystem fileSystem,
AuthAndTLSOptions authAndTlsOptions)
Expand All @@ -257,12 +262,12 @@ public static Credentials newCredentials(
Preconditions.checkNotNull(fileSystem);
Preconditions.checkNotNull(authAndTlsOptions);

Optional<Credentials> credentials = newGoogleCredentials(authAndTlsOptions);
Optional<Credentials> fallbackCredentials = newGoogleCredentials(authAndTlsOptions);

if (credentials.isEmpty()) {
if (fallbackCredentials.isEmpty()) {
// Fallback to .netrc if it exists.
try {
credentials =
fallbackCredentials =
newCredentialsFromNetrc(credentialHelperEnvironment.getClientEnvironment(), fileSystem);
} catch (IOException e) {
// TODO(yannic): Make this fail the build.
Expand All @@ -276,8 +281,8 @@ public static Credentials newCredentials(
commandLinePathFactory,
authAndTlsOptions.credentialHelpers),
credentialHelperEnvironment,
credentials,
authAndTlsOptions.credentialHelperCacheTimeout);
credentialCache,
fallbackCredentials);
}

/**
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Original file line number Diff line number Diff line change
Expand Up @@ -8,9 +8,23 @@ filegroup(
visibility = ["//src:__subpackages__"],
)

java_library(
name = "credential_module",
srcs = ["CredentialModule.java"],
deps = [
"//src/main/java/com/google/devtools/build/lib:runtime",
"//src/main/java/com/google/devtools/build/lib/authandtls",
"//third_party:caffeine",
"//third_party:guava",
],
)

java_library(
name = "credentialhelper",
srcs = glob(["*.java"]),
srcs = glob(
["*.java"],
exclude = ["CredentialModule.java"],
),
deps = [
"//src/main/java/com/google/devtools/build/lib/events",
"//src/main/java/com/google/devtools/build/lib/profiler",
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,7 @@ public Path getPath() {
* @return The response from the subprocess.
*/
public GetCredentialsResponse getCredentials(CredentialHelperEnvironment environment, URI uri)
throws InterruptedException, IOException {
throws IOException {
Preconditions.checkNotNull(environment);
Preconditions.checkNotNull(uri);

Expand All @@ -81,7 +81,16 @@ public GetCredentialsResponse getCredentials(CredentialHelperEnvironment environ
GSON.toJson(GetCredentialsRequest.newBuilder().setUri(uri).build(), stdin);
}

process.waitFor();
try {
process.waitFor();
} catch (InterruptedException e) {
throw new CredentialHelperException(
String.format(
Locale.US,
"Failed to get credentials for '%s' from helper '%s': process was interrupted",
uri,
path));
}

if (process.timedout()) {
throw new CredentialHelperException(
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Original file line number Diff line number Diff line change
Expand Up @@ -14,15 +14,13 @@

package com.google.devtools.build.lib.authandtls.credentialhelper;

import com.github.benmanes.caffeine.cache.CacheLoader;
import com.github.benmanes.caffeine.cache.Caffeine;
import com.github.benmanes.caffeine.cache.LoadingCache;
import com.github.benmanes.caffeine.cache.Cache;
import com.google.auth.Credentials;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.io.IOException;
import java.net.URI;
import java.time.Duration;
import java.util.List;
import java.util.Map;
import java.util.Optional;
Expand All @@ -33,29 +31,34 @@
* helper} as subprocess, falling back to another {@link Credentials} if no suitable helper exists.
*/
public class CredentialHelperCredentials extends Credentials {
private final CredentialHelperProvider credentialHelperProvider;
private final CredentialHelperEnvironment credentialHelperEnvironment;
private final Cache<URI, ImmutableMap<String, ImmutableList<String>>> credentialCache;
private final Optional<Credentials> fallbackCredentials;

private final LoadingCache<URI, GetCredentialsResponse> credentialCache;
/** Wraps around an {@link IOException} so we can smuggle it through {@link Cache#get}. */
public static final class WrappedIOException extends RuntimeException {
private final IOException wrapped;

WrappedIOException(IOException e) {
super(e);
this.wrapped = e;
}

IOException getWrapped() {
return wrapped;
}
}

public CredentialHelperCredentials(
CredentialHelperProvider credentialHelperProvider,
CredentialHelperEnvironment credentialHelperEnvironment,
Optional<Credentials> fallbackCredentials,
Duration cacheTimeout) {
Preconditions.checkNotNull(credentialHelperProvider);
Preconditions.checkNotNull(credentialHelperEnvironment);
Cache<URI, ImmutableMap<String, ImmutableList<String>>> credentialCache,
Optional<Credentials> fallbackCredentials) {
this.credentialHelperProvider = Preconditions.checkNotNull(credentialHelperProvider);
this.credentialHelperEnvironment = Preconditions.checkNotNull(credentialHelperEnvironment);
this.credentialCache = Preconditions.checkNotNull(credentialCache);
this.fallbackCredentials = Preconditions.checkNotNull(fallbackCredentials);
Preconditions.checkNotNull(cacheTimeout);
Preconditions.checkArgument(
!cacheTimeout.isNegative() && !cacheTimeout.isZero(),
"Cache timeout must be greater than 0");

credentialCache =
Caffeine.newBuilder()
.expireAfterWrite(cacheTimeout)
.build(
new CredentialHelperCacheLoader(
credentialHelperProvider, credentialHelperEnvironment));
}

@Override
Expand All @@ -68,12 +71,18 @@ public String getAuthenticationType() {
}

@Override
@SuppressWarnings("unchecked") // Map<String, ImmutableList<String>> to Map<String<List<String>>
public Map<String, List<String>> getRequestMetadata(URI uri) throws IOException {
Preconditions.checkNotNull(uri);

Optional<Map<String, List<String>>> credentials = getRequestMetadataFromCredentialHelper(uri);
if (credentials.isPresent()) {
return credentials.get();
ImmutableMap<String, ImmutableList<String>> credentials;
try {
credentials = credentialCache.get(uri, this::getCredentialsFromHelper);
} catch (WrappedIOException e) {
throw e.getWrapped();
}
if (credentials != null) {
return (Map) credentials;
}

if (fallbackCredentials.isPresent()) {
Expand All @@ -83,13 +92,28 @@ public Map<String, List<String>> getRequestMetadata(URI uri) throws IOException
return ImmutableMap.of();
}

@SuppressWarnings("unchecked") // Map<String, ImmutableList<String>> to Map<String<List<String>>
private Optional<Map<String, List<String>>> getRequestMetadataFromCredentialHelper(URI uri) {
@Nullable
private ImmutableMap<String, ImmutableList<String>> getCredentialsFromHelper(URI uri) {
Preconditions.checkNotNull(uri);

GetCredentialsResponse response = credentialCache.get(uri);
Optional<CredentialHelper> maybeCredentialHelper =
credentialHelperProvider.findCredentialHelper(uri);
if (maybeCredentialHelper.isEmpty()) {
return null;
}
CredentialHelper credentialHelper = maybeCredentialHelper.get();

GetCredentialsResponse response;
try {
response = credentialHelper.getCredentials(credentialHelperEnvironment, uri);
} catch (IOException e) {
throw new WrappedIOException(e);
}
if (response == null) {
return null;
}

return Optional.ofNullable(response).map(value -> (Map) value.getHeaders());
return response.getHeaders();
}

@Override
Expand All @@ -110,32 +134,4 @@ public void refresh() throws IOException {

credentialCache.invalidateAll();
}

private static final class CredentialHelperCacheLoader
implements CacheLoader<URI, GetCredentialsResponse> {
private final CredentialHelperProvider credentialHelperProvider;
private final CredentialHelperEnvironment credentialHelperEnvironment;

public CredentialHelperCacheLoader(
CredentialHelperProvider credentialHelperProvider,
CredentialHelperEnvironment credentialHelperEnvironment) {
this.credentialHelperProvider = Preconditions.checkNotNull(credentialHelperProvider);
this.credentialHelperEnvironment = Preconditions.checkNotNull(credentialHelperEnvironment);
}

@Nullable
@Override
public GetCredentialsResponse load(URI uri) throws IOException, InterruptedException {
Preconditions.checkNotNull(uri);

Optional<CredentialHelper> maybeCredentialHelper =
credentialHelperProvider.findCredentialHelper(uri);
if (maybeCredentialHelper.isEmpty()) {
return null;
}
CredentialHelper credentialHelper = maybeCredentialHelper.get();

return credentialHelper.getCredentials(credentialHelperEnvironment, uri);
}
}
}
Original file line number Diff line number Diff line change
@@ -0,0 +1,52 @@
// Copyright 2022 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.devtools.build.lib.authandtls.credentialhelper;

import com.github.benmanes.caffeine.cache.Cache;
import com.github.benmanes.caffeine.cache.Caffeine;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.authandtls.AuthAndTLSOptions;
import com.google.devtools.build.lib.runtime.BlazeModule;
import com.google.devtools.build.lib.runtime.CommandEnvironment;
import java.net.URI;
import java.time.Duration;

/** A module whose sole purpose is to hold the credential cache which is shared by other modules. */
public class CredentialModule extends BlazeModule {
private final Cache<URI, ImmutableMap<String, ImmutableList<String>>> credentialCache =
Caffeine.newBuilder().expireAfterWrite(Duration.ZERO).build();

/** Returns the credential cache. */
public Cache<URI, ImmutableMap<String, ImmutableList<String>>> getCredentialCache() {
return credentialCache;
}

@Override
public void beforeCommand(CommandEnvironment env) {
// Update the cache expiration policy according to the command options.
AuthAndTLSOptions authAndTlsOptions = env.getOptions().getOptions(AuthAndTLSOptions.class);
credentialCache
.policy()
.expireAfterWrite()
.get()
.setExpiresAfter(authAndTlsOptions.credentialHelperCacheTimeout);

// Clear the cache on clean.
if (env.getCommand().name().equals("clean")) {
credentialCache.invalidateAll();
}
}
}
1 change: 1 addition & 0 deletions src/main/java/com/google/devtools/build/lib/bazel/BUILD
Original file line number Diff line number Diff line change
Expand Up @@ -136,6 +136,7 @@ java_library(
":spawn_log_module",
"//src/main/java/com/google/devtools/build/lib:runtime",
"//src/main/java/com/google/devtools/build/lib/analysis:blaze_version_info",
"//src/main/java/com/google/devtools/build/lib/authandtls/credentialhelper:credential_module",
"//src/main/java/com/google/devtools/build/lib/bazel/coverage",
"//src/main/java/com/google/devtools/build/lib/bazel/debug:workspace-rule-module",
"//src/main/java/com/google/devtools/build/lib/bazel/repository",
Expand Down
3 changes: 3 additions & 0 deletions src/main/java/com/google/devtools/build/lib/bazel/Bazel.java
Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.analysis.BlazeVersionInfo;
import com.google.devtools.build.lib.authandtls.credentialhelper.CredentialModule;
import com.google.devtools.build.lib.runtime.BlazeModule;
import com.google.devtools.build.lib.runtime.BlazeRuntime;
import java.io.IOException;
Expand All @@ -42,6 +43,8 @@ public final class Bazel {
// This module needs to be registered before any module providing a SpawnCache
// implementation.
com.google.devtools.build.lib.runtime.NoSpawnCacheModule.class,
// This module needs to be registered before any module that uses the credential cache.
CredentialModule.class,
com.google.devtools.build.lib.runtime.CommandLogModule.class,
com.google.devtools.build.lib.runtime.MemoryPressureModule.class,
com.google.devtools.build.lib.platform.SleepPreventionModule.class,
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -38,9 +38,11 @@ java_library(
":buildeventservice-options",
"//src/main/java/com/google/devtools/build/lib:build-request-options",
"//src/main/java/com/google/devtools/build/lib:runtime",
"//src/main/java/com/google/devtools/build/lib/analysis:blaze_directories",
"//src/main/java/com/google/devtools/build/lib/analysis:test/test_configuration",
"//src/main/java/com/google/devtools/build/lib/authandtls",
"//src/main/java/com/google/devtools/build/lib/authandtls/credentialhelper",
"//src/main/java/com/google/devtools/build/lib/authandtls/credentialhelper:credential_module",
"//src/main/java/com/google/devtools/build/lib/bugreport",
"//src/main/java/com/google/devtools/build/lib/buildeventservice/client",
"//src/main/java/com/google/devtools/build/lib/buildeventstream",
Expand Down
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