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Add QuotaHandler to GCP proxy

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The quota handler terminates connections when quota is exceeded.

The next CL will add instrumentation for quota related metrics.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=185042675
This commit is contained in:
jianglai 2018-02-08 13:30:21 -08:00
parent d38e29fd5e
commit 6ca523386a
10 changed files with 550 additions and 35 deletions
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42
java/google/registry/proxy/quota/QuotaManager.java
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@ -15,7 +15,6 @@
package google.registry.proxy.quota;
import com.google.auto.value.AutoValue;
import google.registry.proxy.quota.QuotaManager.QuotaResponse.Status;
import google.registry.proxy.quota.TokenStore.TimestampedInteger;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
@ -40,38 +39,36 @@ import org.joda.time.DateTime;
@ThreadSafe
public class QuotaManager {
/** Value class representing a quota request. */
@AutoValue
abstract static class QuotaRequest {
public abstract static class QuotaRequest {
static QuotaRequest create(String userId) {
public static QuotaRequest create(String userId) {
return new AutoValue_QuotaManager_QuotaRequest(userId);
}
abstract String userId();
}
/** Value class representing a quota response. */
@AutoValue
abstract static class QuotaResponse {
enum Status {
SUCCESS,
FAILURE,
public abstract static class QuotaResponse {
public static QuotaResponse create(
boolean success, String userId, DateTime grantedTokenRefillTime) {
return new AutoValue_QuotaManager_QuotaResponse(success, userId, grantedTokenRefillTime);
}
static QuotaResponse create(Status status, String userId, DateTime grantedTokenRefillTime) {
return new AutoValue_QuotaManager_QuotaResponse(status, userId, grantedTokenRefillTime);
}
abstract Status status();
public abstract boolean success();
abstract String userId();
abstract DateTime grantedTokenRefillTime();
}
/** Value class representing a quota rebate. */
@AutoValue
abstract static class QuotaRebate {
static QuotaRebate create(QuotaResponse response) {
public abstract static class QuotaRebate {
public static QuotaRebate create(QuotaResponse response) {
return new AutoValue_QuotaManager_QuotaRebate(
response.userId(), response.grantedTokenRefillTime());
}
@ -85,25 +82,20 @@ public class QuotaManager {
private final ExecutorService backgroundExecutor;
QuotaManager(TokenStore tokenStore, ExecutorService backgroundExecutor) {
public QuotaManager(TokenStore tokenStore, ExecutorService backgroundExecutor) {
this.tokenStore = tokenStore;
this.backgroundExecutor = backgroundExecutor;
tokenStore.scheduleRefresh();
}
/** Attempts to acquire requested quota, synchronously. */
QuotaResponse acquireQuota(QuotaRequest request) {
public QuotaResponse acquireQuota(QuotaRequest request) {
TimestampedInteger tokens = tokenStore.take(request.userId());
Status status = (tokens.value() == 0) ? Status.FAILURE : Status.SUCCESS;
return QuotaResponse.create(status, request.userId(), tokens.timestamp());
return QuotaResponse.create(tokens.value() != 0, request.userId(), tokens.timestamp());
}
/**
* Returns granted quota to the token store, asynchronously.
*
* @return a {@link Future} representing the asynchronous task to return the quota.
*/
Future<?> releaseQuota(QuotaRebate rebate) {
/** Returns granted quota to the token store, asynchronously. */
public Future<?> releaseQuota(QuotaRebate rebate) {
return backgroundExecutor.submit(
() -> tokenStore.put(rebate.userId(), rebate.grantedTokenRefillTime()));
}