| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.flink.statefun.flink.core.jsonmodule; |
| |
| import static java.util.stream.Collectors.groupingBy; |
| import static java.util.stream.Collectors.toMap; |
| import static org.apache.flink.statefun.flink.core.common.Maps.transformValues; |
| import static org.apache.flink.statefun.flink.core.jsonmodule.FunctionSpec.Kind; |
| |
| import java.net.InetSocketAddress; |
| import java.net.URI; |
| import java.time.Duration; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.OptionalInt; |
| import java.util.Set; |
| import java.util.function.Function; |
| import java.util.stream.Collector; |
| import java.util.stream.Collectors; |
| import java.util.stream.StreamSupport; |
| import javax.annotation.Nullable; |
| import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.core.JsonPointer; |
| import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.JsonNode; |
| import org.apache.flink.statefun.flink.common.json.NamespaceNamePair; |
| import org.apache.flink.statefun.flink.common.json.Selectors; |
| import org.apache.flink.statefun.flink.core.grpcfn.GrpcFunctionProvider; |
| import org.apache.flink.statefun.flink.core.grpcfn.GrpcFunctionSpec; |
| import org.apache.flink.statefun.flink.core.httpfn.HttpFunctionProvider; |
| import org.apache.flink.statefun.flink.core.httpfn.HttpFunctionSpec; |
| import org.apache.flink.statefun.flink.core.httpfn.StateSpec; |
| import org.apache.flink.statefun.sdk.FunctionType; |
| import org.apache.flink.statefun.sdk.StatefulFunctionProvider; |
| import org.apache.flink.statefun.sdk.spi.StatefulFunctionModule.Binder; |
| import org.apache.flink.statefun.sdk.state.Expiration; |
| import org.apache.flink.util.TimeUtils; |
| |
| final class FunctionJsonEntity implements JsonEntity { |
| |
| private static final JsonPointer FUNCTION_SPECS_POINTER = JsonPointer.compile("/functions"); |
| |
| private static final class MetaPointers { |
| private static final JsonPointer KIND = JsonPointer.compile("/function/meta/kind"); |
| private static final JsonPointer TYPE = JsonPointer.compile("/function/meta/type"); |
| } |
| |
| private static final class SpecPointers { |
| private static final JsonPointer HOSTNAME = JsonPointer.compile("/function/spec/host"); |
| private static final JsonPointer ENDPOINT = JsonPointer.compile("/function/spec/endpoint"); |
| private static final JsonPointer PORT = JsonPointer.compile("/function/spec/port"); |
| private static final JsonPointer STATES = JsonPointer.compile("/function/spec/states"); |
| private static final JsonPointer TIMEOUT = JsonPointer.compile("/function/spec/timeout"); |
| private static final JsonPointer MAX_NUM_BATCH_REQUESTS = |
| JsonPointer.compile("/function/spec/maxNumBatchRequests"); |
| } |
| |
| private static final class StateSpecPointers { |
| private static final JsonPointer NAME = JsonPointer.compile("/name"); |
| private static final JsonPointer EXPIRE_DURATION = JsonPointer.compile("/expireAfter"); |
| private static final JsonPointer EXPIRE_MODE = JsonPointer.compile("/expireMode"); |
| } |
| |
| @Override |
| public void bind(Binder binder, JsonNode moduleSpecRootNode, FormatVersion formatVersion) { |
| final Iterable<? extends JsonNode> functionSpecNodes = functionSpecNodes(moduleSpecRootNode); |
| |
| for (Map.Entry<Kind, Map<FunctionType, FunctionSpec>> entry : |
| parse(functionSpecNodes, formatVersion).entrySet()) { |
| StatefulFunctionProvider provider = functionProvider(entry.getKey(), entry.getValue()); |
| Set<FunctionType> functionTypes = entry.getValue().keySet(); |
| for (FunctionType type : functionTypes) { |
| binder.bindFunctionProvider(type, provider); |
| } |
| } |
| } |
| |
| private Map<Kind, Map<FunctionType, FunctionSpec>> parse( |
| Iterable<? extends JsonNode> functionSpecNodes, FormatVersion formatVersion) { |
| return StreamSupport.stream(functionSpecNodes.spliterator(), false) |
| .map(functionSpecNode -> parseFunctionSpec(functionSpecNode, formatVersion)) |
| .collect(groupingBy(FunctionSpec::kind, groupByFunctionType())); |
| } |
| |
| private static Iterable<? extends JsonNode> functionSpecNodes(JsonNode moduleSpecRootNode) { |
| return Selectors.listAt(moduleSpecRootNode, FUNCTION_SPECS_POINTER); |
| } |
| |
| private static FunctionSpec parseFunctionSpec( |
| JsonNode functionNode, FormatVersion formatVersion) { |
| String functionKind = Selectors.textAt(functionNode, MetaPointers.KIND); |
| FunctionSpec.Kind kind = |
| FunctionSpec.Kind.valueOf(functionKind.toUpperCase(Locale.getDefault())); |
| FunctionType functionType = functionType(functionNode); |
| switch (kind) { |
| case HTTP: |
| final HttpFunctionSpec.Builder specBuilder = |
| HttpFunctionSpec.builder(functionType, functionUri(functionNode)); |
| |
| final Function<JsonNode, List<StateSpec>> stateSpecParser = |
| functionStateParserOf(formatVersion); |
| for (StateSpec state : stateSpecParser.apply(functionNode)) { |
| specBuilder.withState(state); |
| } |
| optionalMaxNumBatchRequests(functionNode).ifPresent(specBuilder::withMaxNumBatchRequests); |
| optionalMaxRequestDuration(functionNode).ifPresent(specBuilder::withMaxRequestDuration); |
| |
| return specBuilder.build(); |
| case GRPC: |
| return new GrpcFunctionSpec(functionType, functionAddress(functionNode)); |
| default: |
| throw new IllegalArgumentException("Unrecognized function kind " + functionKind); |
| } |
| } |
| |
| private static Function<JsonNode, List<StateSpec>> functionStateParserOf( |
| FormatVersion formatVersion) { |
| switch (formatVersion) { |
| case v1_0: |
| return FunctionJsonEntity::functionStateSpecParserV1; |
| case v2_0: |
| return FunctionJsonEntity::functionStateSpecParserV2; |
| default: |
| throw new IllegalStateException("Unrecognized format version: " + formatVersion); |
| } |
| } |
| |
| private static List<StateSpec> functionStateSpecParserV1(JsonNode functionNode) { |
| final List<String> stateNames = Selectors.textListAt(functionNode, SpecPointers.STATES); |
| return stateNames.stream().map(StateSpec::new).collect(Collectors.toList()); |
| } |
| |
| private static List<StateSpec> functionStateSpecParserV2(JsonNode functionNode) { |
| final Iterable<? extends JsonNode> stateSpecNodes = |
| Selectors.listAt(functionNode, SpecPointers.STATES); |
| final List<StateSpec> stateSpecs = new ArrayList<>(); |
| |
| stateSpecNodes.forEach( |
| stateSpecNode -> { |
| final String name = Selectors.textAt(stateSpecNode, StateSpecPointers.NAME); |
| final Expiration expiration = stateTtlExpiration(stateSpecNode); |
| stateSpecs.add(new StateSpec(name, expiration)); |
| }); |
| return stateSpecs; |
| } |
| |
| private static OptionalInt optionalMaxNumBatchRequests(JsonNode functionNode) { |
| return Selectors.optionalIntegerAt(functionNode, SpecPointers.MAX_NUM_BATCH_REQUESTS); |
| } |
| |
| private static Optional<Duration> optionalMaxRequestDuration(JsonNode functionNode) { |
| return Selectors.optionalTextAt(functionNode, SpecPointers.TIMEOUT) |
| .map(TimeUtils::parseDuration); |
| } |
| |
| private static Expiration stateTtlExpiration(JsonNode stateSpecNode) { |
| final Optional<Duration> duration = |
| Selectors.optionalTextAt(stateSpecNode, StateSpecPointers.EXPIRE_DURATION) |
| .map(TimeUtils::parseDuration); |
| |
| if (!duration.isPresent()) { |
| return Expiration.none(); |
| } |
| |
| final Optional<String> mode = |
| Selectors.optionalTextAt(stateSpecNode, StateSpecPointers.EXPIRE_MODE); |
| if (!mode.isPresent()) { |
| return Expiration.expireAfterReadingOrWriting(duration.get()); |
| } |
| |
| switch (mode.get()) { |
| case "after-invoke": |
| return Expiration.expireAfterReadingOrWriting(duration.get()); |
| case "after-write": |
| return Expiration.expireAfterWriting(duration.get()); |
| default: |
| throw new IllegalArgumentException( |
| "Invalid state ttl expire mode; must be one of [after-invoke, after-write]."); |
| } |
| } |
| |
| private static FunctionType functionType(JsonNode functionNode) { |
| String namespaceName = Selectors.textAt(functionNode, MetaPointers.TYPE); |
| NamespaceNamePair nn = NamespaceNamePair.from(namespaceName); |
| return new FunctionType(nn.namespace(), nn.name()); |
| } |
| |
| private static InetSocketAddress functionAddress(JsonNode functionNode) { |
| String host = Selectors.textAt(functionNode, SpecPointers.HOSTNAME); |
| int port = Selectors.integerAt(functionNode, SpecPointers.PORT); |
| return new InetSocketAddress(host, port); |
| } |
| |
| private static URI functionUri(JsonNode functionNode) { |
| String uri = Selectors.textAt(functionNode, SpecPointers.ENDPOINT); |
| URI typedUri = URI.create(uri); |
| @Nullable String scheme = typedUri.getScheme(); |
| if (scheme == null) { |
| throw new IllegalArgumentException( |
| "Missing scheme in function endpoint " |
| + uri |
| + "; an http or https scheme must be provided."); |
| } |
| if (scheme.equalsIgnoreCase("http") |
| || scheme.equalsIgnoreCase("https") |
| || scheme.equalsIgnoreCase("http+unix") |
| || scheme.equalsIgnoreCase("https+unix")) { |
| return typedUri; |
| } |
| throw new IllegalArgumentException( |
| "Missing scheme in function endpoint " |
| + uri |
| + "; an http or https or http+unix or https+unix scheme must be provided."); |
| } |
| |
| private static Collector<FunctionSpec, ?, Map<FunctionType, FunctionSpec>> groupByFunctionType() { |
| return toMap(FunctionSpec::functionType, Function.identity()); |
| } |
| |
| private static StatefulFunctionProvider functionProvider( |
| Kind kind, Map<FunctionType, FunctionSpec> definedFunctions) { |
| switch (kind) { |
| case HTTP: |
| return new HttpFunctionProvider( |
| transformValues(definedFunctions, HttpFunctionSpec.class::cast)); |
| case GRPC: |
| return new GrpcFunctionProvider( |
| transformValues(definedFunctions, GrpcFunctionSpec.class::cast)); |
| default: |
| throw new IllegalStateException("Unexpected value: " + kind); |
| } |
| } |
| } |