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// Copyright (C) 2018 The Android Open Source Project
//
// 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.gerrit.server.quota;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.collect.ImmutableList;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.entities.Account;
import com.google.gerrit.entities.Change;
import com.google.gerrit.entities.Project;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.plugincontext.PluginSetContext;
import com.google.gerrit.server.plugincontext.PluginSetEntryContext;
import com.google.gerrit.server.quota.QuotaResponse.Aggregated;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.util.ArrayList;
import java.util.List;
@Singleton
public class DefaultQuotaBackend implements QuotaBackend {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private final Provider userProvider;
private final PluginSetContext quotaEnforcers;
@Inject
DefaultQuotaBackend(
Provider userProvider, PluginSetContext quotaEnforcers) {
this.userProvider = userProvider;
this.quotaEnforcers = quotaEnforcers;
}
@Override
public WithUser currentUser() {
return new WithUser(quotaEnforcers, userProvider.get());
}
@Override
public WithUser user(CurrentUser user) {
return new WithUser(quotaEnforcers, user);
}
private static QuotaResponse.Aggregated request(
PluginSetContext quotaEnforcers,
String quotaGroup,
QuotaRequestContext requestContext,
long numTokens,
boolean deduct) {
checkState(numTokens > 0, "numTokens must be a positive, non-zero long");
// PluginSets can change their content when plugins (de-)register. Copy the currently registered
// plugins so that we can iterate twice on a stable list.
List> enforcers = ImmutableList.copyOf(quotaEnforcers);
List responses = new ArrayList<>(enforcers.size());
for (PluginSetEntryContext enforcer : enforcers) {
try {
if (deduct) {
responses.add(enforcer.call(p -> p.requestTokens(quotaGroup, requestContext, numTokens)));
} else {
responses.add(enforcer.call(p -> p.dryRun(quotaGroup, requestContext, numTokens)));
}
} catch (RuntimeException e) {
// Roll back the quota request for all enforcers that deducted the quota. Rethrow the
// exception to adhere to the API contract.
if (deduct) {
refillAfterErrorOrException(enforcers, responses, quotaGroup, requestContext, numTokens);
}
throw e;
}
}
if (deduct && responses.stream().anyMatch(r -> r.status().isError())) {
// Roll back the quota request for all enforcers that deducted the quota (= the request
// succeeded). Don't touch failed enforcers as the interface contract said that failed
// requests should not be deducted.
refillAfterErrorOrException(enforcers, responses, quotaGroup, requestContext, numTokens);
}
logger.atFine().log(
"Quota request for %s with %s (deduction=%s) for %s token returned %s",
quotaGroup,
requestContext,
deduct ? "(deduction=yes)" : "(deduction=no)",
numTokens,
responses);
return QuotaResponse.Aggregated.create(ImmutableList.copyOf(responses));
}
private static QuotaResponse.Aggregated availableTokens(
PluginSetContext quotaEnforcers,
String quotaGroup,
QuotaRequestContext requestContext) {
// PluginSets can change their content when plugins (de-)register. Copy the currently registered
// plugins so that we can iterate twice on a stable list.
List> enforcers = ImmutableList.copyOf(quotaEnforcers);
List responses = new ArrayList<>(enforcers.size());
for (PluginSetEntryContext enforcer : enforcers) {
responses.add(enforcer.call(p -> p.availableTokens(quotaGroup, requestContext)));
}
return QuotaResponse.Aggregated.create(responses);
}
private static void refillAfterErrorOrException(
List> enforcers,
List collectedResponses,
String quotaGroup,
QuotaRequestContext requestContext,
long numTokens) {
for (int i = 0; i < collectedResponses.size(); i++) {
if (collectedResponses.get(i).status().isOk()) {
enforcers.get(i).run(p -> p.refill(quotaGroup, requestContext, numTokens));
}
}
}
static class WithUser extends WithResource implements QuotaBackend.WithUser {
WithUser(PluginSetContext quotaEnforcers, CurrentUser user) {
super(quotaEnforcers, QuotaRequestContext.builder().user(user).build());
}
@Override
public QuotaBackend.WithResource account(Account.Id account) {
QuotaRequestContext ctx = requestContext.toBuilder().account(account).build();
return new WithResource(quotaEnforcers, ctx);
}
@Override
public QuotaBackend.WithResource project(Project.NameKey project) {
QuotaRequestContext ctx = requestContext.toBuilder().project(project).build();
return new WithResource(quotaEnforcers, ctx);
}
@Override
public QuotaBackend.WithResource change(Change.Id change, Project.NameKey project) {
QuotaRequestContext ctx = requestContext.toBuilder().change(change).project(project).build();
return new WithResource(quotaEnforcers, ctx);
}
}
static class WithResource implements QuotaBackend.WithResource {
protected final QuotaRequestContext requestContext;
protected final PluginSetContext quotaEnforcers;
private WithResource(
PluginSetContext quotaEnforcers, QuotaRequestContext quotaRequestContext) {
this.quotaEnforcers = quotaEnforcers;
this.requestContext = quotaRequestContext;
}
@Override
public QuotaResponse.Aggregated requestTokens(String quotaGroup, long numTokens) {
return DefaultQuotaBackend.request(
quotaEnforcers, quotaGroup, requestContext, numTokens, true);
}
@Override
public QuotaResponse.Aggregated dryRun(String quotaGroup, long numTokens) {
return DefaultQuotaBackend.request(
quotaEnforcers, quotaGroup, requestContext, numTokens, false);
}
@Override
public Aggregated availableTokens(String quotaGroup) {
return DefaultQuotaBackend.availableTokens(quotaEnforcers, quotaGroup, requestContext);
}
}
}
