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TwitchHelixHttpClient.java
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/
TwitchHelixHttpClient.java
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package com.github.twitch4j.helix.interceptor;
import com.github.philippheuer.credentialmanager.domain.OAuth2Credential;
import com.github.twitch4j.common.util.BucketUtils;
import feign.Client;
import feign.Request;
import feign.Response;
import feign.okhttp.OkHttpClient;
import io.github.bucket4j.Bucket;
import lombok.extern.slf4j.Slf4j;
import org.jetbrains.annotations.Nullable;
import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import static com.github.twitch4j.helix.interceptor.TwitchHelixClientIdInterceptor.AUTH_HEADER;
import static com.github.twitch4j.helix.interceptor.TwitchHelixClientIdInterceptor.BEARER_PREFIX;
import static com.github.twitch4j.helix.interceptor.TwitchHelixClientIdInterceptor.CLIENT_HEADER;
@Slf4j
public class TwitchHelixHttpClient implements Client {
private final Client client;
private final ScheduledExecutorService executor;
private final TwitchHelixTokenManager tokenManager;
private final TwitchHelixRateLimitTracker rateLimitTracker;
private final long timeout;
public TwitchHelixHttpClient(OkHttpClient client, ScheduledThreadPoolExecutor executor, TwitchHelixTokenManager tokenManager, TwitchHelixRateLimitTracker rateLimitTracker, Integer timeout) {
this.client = client;
this.executor = executor;
this.tokenManager = tokenManager;
this.rateLimitTracker = rateLimitTracker;
this.timeout = timeout == null ? 60 * 1000 : timeout.longValue();
}
@Override
public Response execute(Request request, Request.Options options) throws IOException {
// Check whether this request should be delayed to conform to rate limits
String token = getFirstHeader(AUTH_HEADER, request);
if (token != null && token.startsWith(BEARER_PREFIX)) {
OAuth2Credential credential = tokenManager.getIfPresent(token.substring(BEARER_PREFIX.length()));
if (credential != null) {
// First consume from helix global rate limit (800/min by default)
Bucket bucket = rateLimitTracker.getOrInitializeBucket(rateLimitTracker.getPrimaryBucketKey(credential));
return executeAgainstBucket(bucket, () -> delegatedExecute(request, options));
}
}
// Fallback: just run the http request
return delegatedExecute(request, options);
}
/**
* After the helix rate limit has been evaluated, check for any other endpoint-specific limits before actually executing the request.
*
* @param request feign request
* @param options feign request options
* @return feign response
* @throws IOException on network errors
*/
private Response delegatedExecute(Request request, Request.Options options) throws IOException {
String templatePath = request.requestTemplate().path();
// Channels API: addChannelVip and removeChannelVip (likely) share a bucket per channel id
if (templatePath.endsWith("/channels/vips")) {
// Obtain the channel id
String channelId = getFirstParam("broadcaster_id", request);
// Conform to endpoint-specific bucket
Bucket vipBucket;
if (request.httpMethod() == Request.HttpMethod.POST) {
vipBucket = rateLimitTracker.getVipAddBucket(channelId);
} else if (request.httpMethod() == Request.HttpMethod.DELETE) {
vipBucket = rateLimitTracker.getVipRemoveBucket(channelId);
} else {
vipBucket = null;
}
if (vipBucket != null)
return executeAgainstBucket(vipBucket, () -> client.execute(request, options));
}
// Moderation API: Check AutoMod Status has a stricter bucket that applies per channel id
if (request.httpMethod() == Request.HttpMethod.POST && templatePath.endsWith("/moderation/enforcements/status")) {
// Obtain the channel id
String channelId = getFirstParam("broadcaster_id", request);
// Conform to endpoint-specific bucket
Bucket autoModBucket = rateLimitTracker.getAutomodStatusBucket(channelId);
return executeAgainstBucket(autoModBucket, () -> client.execute(request, options));
}
// Moderation API: banUser and unbanUser share a bucket per channel id
if (templatePath.endsWith("/moderation/bans")) {
// Obtain the channel id
String channelId = getFirstParam("broadcaster_id", request);
// Conform to endpoint-specific bucket
Bucket modBucket = rateLimitTracker.getModerationBucket(channelId);
return executeAgainstBucket(modBucket, () -> client.execute(request, options));
}
// Moderation API: addBlockedTerm and removeBlockedTerm share a bucket per channel id
if (templatePath.endsWith("/moderation/blocked_terms") && (request.httpMethod() == Request.HttpMethod.POST || request.httpMethod() == Request.HttpMethod.DELETE)) {
// Obtain the channel id
String channelId = getFirstParam("broadcaster_id", request);
// Conform to endpoint-specific bucket
Bucket termsBucket = rateLimitTracker.getTermsBucket(channelId);
return executeAgainstBucket(termsBucket, () -> client.execute(request, options));
}
// Moderation API: addChannelModerator and removeChannelModerator have independent buckets per channel id
if (templatePath.endsWith("/moderation/moderators")) {
// Obtain the channel id
String channelId = getFirstParam("broadcaster_id", request);
// Conform to endpoint-specific bucket
Bucket modsBucket;
if (request.httpMethod() == Request.HttpMethod.POST) {
modsBucket = rateLimitTracker.getModAddBucket(channelId);
} else if (request.httpMethod() == Request.HttpMethod.DELETE) {
modsBucket = rateLimitTracker.getModRemoveBucket(channelId);
} else {
modsBucket = null;
}
if (modsBucket != null)
return executeAgainstBucket(modsBucket, () -> client.execute(request, options));
}
// Clips API: createClip has a stricter bucket that applies per user id
if (request.httpMethod() == Request.HttpMethod.POST && templatePath.endsWith("/clips")) {
// Obtain user id
String token = Objects.requireNonNull(getFirstHeader(AUTH_HEADER, request)).substring(BEARER_PREFIX.length());
OAuth2Credential cred = tokenManager.getIfPresent(token);
String userId = cred != null ? cred.getUserId() : "";
// Conform to endpoint-specific bucket
Bucket clipBucket = rateLimitTracker.getClipBucket(userId != null ? userId : "");
return executeAgainstBucket(clipBucket, () -> client.execute(request, options));
}
// Extensions API: sendExtensionChatMessage has a stricter per-channel bucket
if (request.httpMethod() == Request.HttpMethod.POST && templatePath.endsWith("/extensions/chat")) {
// Obtain the bucket key
String clientId = getFirstHeader(CLIENT_HEADER, request);
String channelId = getFirstParam("broadcaster_id", request);
// Conform to endpoint-specific bucket
Bucket chatBucket = rateLimitTracker.getExtensionChatBucket(Objects.requireNonNull(clientId), Objects.requireNonNull(channelId));
return executeAgainstBucket(chatBucket, () -> client.execute(request, options));
}
// Extensions API: sendExtensionPubSubMessage has a stricter bucket depending on the target
if (request.httpMethod() == Request.HttpMethod.POST && templatePath.endsWith("/extensions/pubsub")) {
// Obtain the bucket key
String clientId = getFirstHeader(CLIENT_HEADER, request);
String target = getFirstHeader("Twitch4J-Target", request);
// Conform to endpoint-specific bucket
Bucket pubSubBucket = rateLimitTracker.getExtensionPubSubBucket(Objects.requireNonNull(clientId), Objects.requireNonNull(target));
return executeAgainstBucket(pubSubBucket, () -> client.execute(request, options));
}
// Raids API: startRaid and cancelRaid have a stricter bucket that applies per channel id
if (templatePath.endsWith("/raids")) {
// Obtain the channel id
String param = request.httpMethod() == Request.HttpMethod.POST ? "from_broadcaster_id" : "broadcaster_id";
String channelId = getFirstParam(param, request);
// Conform to endpoint-specific bucket
Bucket raidBucket = rateLimitTracker.getRaidsBucket(Objects.requireNonNull(channelId));
return executeAgainstBucket(raidBucket, () -> client.execute(request, options));
}
// Whispers API: sendWhisper has a stricter bucket that applies per user id
if (templatePath.endsWith("/whispers")) {
// Obtain the user id
String userId = getFirstParam("from_user_id", request);
// Conform to endpoint-specific bucket
Bucket whisperBucket = rateLimitTracker.getWhispersBucket(Objects.requireNonNull(userId));
return executeAgainstBucket(whisperBucket, () -> client.execute(request, options));
}
// no endpoint-specific rate limiting was needed; simply perform network request now
return client.execute(request, options);
}
@Nullable
static String getFirstHeader(String key, Request request) {
return getFirst(key, request.headers());
}
@Nullable
static String getFirstParam(String key, Request request) {
return getFirst(key, request.requestTemplate().queries());
}
@Nullable
static String getFirst(String key, Map<String, Collection<String>> map) {
final Collection<String> values = map.get(key);
return values != null && !values.isEmpty() ? values.iterator().next() : null;
}
private <T> T executeAgainstBucket(Bucket bucket, Callable<T> call) throws IOException {
try {
return BucketUtils.scheduleAgainstBucket(bucket, executor, call).get(timeout, TimeUnit.MILLISECONDS);
} catch (InterruptedException | ExecutionException | TimeoutException e) {
if (e.getCause() instanceof IOException) throw (IOException) e.getCause();
log.error("Throttled Helix API call timed-out before completion", e);
return null;
}
}
}