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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.feed.client;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.StringJoiner;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Supplier;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.Objects.requireNonNull;
/**
* HTTP implementation of {@link FeedClient}
*
* @author bjorncs
* @author jonmv
*/
class HttpFeedClient implements FeedClient {
private static final JsonFactory factory = new JsonFactory();
private final Map<String, Supplier<String>> requestHeaders;
private final RequestStrategy requestStrategy;
private final AtomicBoolean closed = new AtomicBoolean();
HttpFeedClient(FeedClientBuilder builder) throws IOException {
this(builder, new HttpRequestStrategy(builder));
}
HttpFeedClient(FeedClientBuilder builder, RequestStrategy requestStrategy) {
this.requestHeaders = new HashMap<>(builder.requestHeaders);
this.requestStrategy = requestStrategy;
}
@Override
public CompletableFuture<Result> put(DocumentId documentId, String documentJson, OperationParameters params) {
return send("POST", documentId, requireNonNull(documentJson), params);
}
@Override
public CompletableFuture<Result> update(DocumentId documentId, String updateJson, OperationParameters params) {
return send("PUT", documentId, requireNonNull(updateJson), params);
}
@Override
public CompletableFuture<Result> remove(DocumentId documentId, OperationParameters params) {
return send("DELETE", documentId, null, params);
}
@Override
public OperationStats stats() {
return requestStrategy.stats();
}
@Override
public CircuitBreaker.State circuitBreakerState() {
return requestStrategy.circuitBreakerState();
}
@Override
public void close(boolean graceful) {
closed.set(true);
if (graceful)
requestStrategy.await();
requestStrategy.destroy();
}
private CompletableFuture<Result> send(String method, DocumentId documentId, String operationJson, OperationParameters params) {
if (closed.get())
throw new IllegalStateException("Client is closed");
HttpRequest request = new HttpRequest(method,
getPath(documentId) + getQuery(params),
requestHeaders,
operationJson == null ? null : operationJson.getBytes(UTF_8)); // TODO: make it bytes all the way?
CompletableFuture<Result> promise = new CompletableFuture<>();
requestStrategy.enqueue(documentId, request)
.thenApply(response -> toResult(request, response, documentId))
.whenComplete((result, thrown) -> {
if (thrown != null) {
while (thrown instanceof CompletionException)
thrown = thrown.getCause();
promise.completeExceptionally(thrown);
}
else
promise.complete(result);
});
return promise;
}
private enum Outcome { success, conditionNotMet, vespaFailure, transportFailure };
static Result.Type toResultType(Outcome outcome) {
switch (outcome) {
case success: return Result.Type.success;
case conditionNotMet: return Result.Type.conditionNotMet;
default: throw new IllegalArgumentException("No corresponding result type for '" + outcome + "'");
}
}
static Result toResult(HttpRequest request, HttpResponse response, DocumentId documentId) {
Outcome outcome;
switch (response.code()) {
case 200: outcome = Outcome.success; break;
case 412: outcome = Outcome.conditionNotMet; break;
case 502:
case 504:
case 507: outcome = Outcome.vespaFailure; break;
default: outcome = Outcome.transportFailure;
}
String message = null;
String trace = null;
try {
JsonParser parser = factory.createParser(response.body());
if (parser.nextToken() != JsonToken.START_OBJECT)
throw new ResultParseException(
documentId,
"Expected '" + JsonToken.START_OBJECT + "', but found '" + parser.currentToken() + "' in: " +
new String(response.body(), UTF_8));
String name;
while ((name = parser.nextFieldName()) != null) {
switch (name) {
case "message": message = parser.nextTextValue(); break;
case "trace": {
if (parser.nextToken() != JsonToken.START_ARRAY)
throw new ResultParseException(documentId,
"Expected 'trace' to be an array, but got '" + parser.currentToken() + "' in: " +
new String(response.body(), UTF_8));
int start = (int) parser.getTokenLocation().getByteOffset();
int depth = 1;
while (depth > 0) switch (parser.nextToken()) {
case START_ARRAY: ++depth; break;
case END_ARRAY: --depth; break;
}
int end = (int) parser.getTokenLocation().getByteOffset() + 1;
trace = new String(response.body(), start, end - start, UTF_8);
}; break;
default: parser.nextToken();
}
}
if (parser.currentToken() != JsonToken.END_OBJECT)
throw new ResultParseException(
documentId,
"Expected '" + JsonToken.END_OBJECT + "', but found '" + parser.currentToken() + "' in: "
+ new String(response.body(), UTF_8));
}
catch (IOException e) {
throw new ResultParseException(documentId, e);
}
if (outcome == Outcome.transportFailure) // Not a Vespa response, but a failure in the HTTP layer.
throw new FeedException(
documentId,
"Status " + response.code() + " executing '" + request + "': "
+ (message == null ? new String(response.body(), UTF_8) : message));
if (outcome == Outcome.vespaFailure)
throw new ResultException(documentId, message, trace);
return new Result(toResultType(outcome), documentId, message, trace);
}
static String getPath(DocumentId documentId) {
StringJoiner path = new StringJoiner("/", "/", "");
path.add("document");
path.add("v1");
path.add(encode(documentId.namespace()));
path.add(encode(documentId.documentType()));
if (documentId.number().isPresent()) {
path.add("number");
path.add(Long.toUnsignedString(documentId.number().getAsLong()));
}
else if (documentId.group().isPresent()) {
path.add("group");
path.add(encode(documentId.group().get()));
}
else {
path.add("docid");
}
path.add(encode(documentId.userSpecific()));
return path.toString();
}
static String encode(String raw) {
try {
return URLEncoder.encode(raw, UTF_8.name());
}
catch (UnsupportedEncodingException e) {
throw new IllegalStateException(e);
}
}
static String getQuery(OperationParameters params) {
StringJoiner query = new StringJoiner("&", "?", "").setEmptyValue("");
if (params.createIfNonExistent()) query.add("create=true");
params.testAndSetCondition().ifPresent(condition -> query.add("condition=" + encode(condition)));
params.timeout().ifPresent(timeout -> query.add("timeout=" + timeout.toMillis() + "ms"));
params.route().ifPresent(route -> query.add("route=" + encode(route)));
params.tracelevel().ifPresent(tracelevel -> query.add("tracelevel=" + tracelevel));
return query.toString();
}
}
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