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56 changes: 56 additions & 0 deletions
56
...src/main/java/com/google/api/graphql/examples/library/graphqlserver/DataLoaderModule.java
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| Original file line number | Original file line | Diff line number | Diff line change |
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| @@ -0,0 +1,56 @@ | |||
| // Copyright 2017 Google LLC | |||
| // | |||
| // 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. | |||
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|
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| package com.google.api.graphql.examples.library.graphqlserver; | |||
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| import com.google.common.util.concurrent.Futures; | |||
| import com.google.common.util.concurrent.ListenableFuture; | |||
| import com.google.common.util.concurrent.MoreExecutors; | |||
| import com.google.example.library.book.v1.Book; | |||
| import com.google.example.library.book.v1.BookServiceGrpc; | |||
| import com.google.example.library.book.v1.ListBooksRequest; | |||
| import com.google.inject.AbstractModule; | |||
| import com.google.inject.Provides; | |||
| import com.google.inject.servlet.RequestScoped; | |||
| import net.javacrumbs.futureconverter.java8guava.FutureConverter; | |||
| import org.dataloader.BatchLoader; | |||
| import org.dataloader.DataLoader; | |||
| import org.dataloader.DataLoaderRegistry; | |||
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| import java.util.List; | |||
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| final class DataLoaderModule extends AbstractModule { | |||
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| @Provides | |||
| @RequestScoped | |||
| DataLoaderRegistry dataLoaderRegistry(BookServiceGrpc.BookServiceFutureStub bookService) { | |||
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| // TODO: Use multibinder to modularize this, or automate this somehow | |||
| BatchLoader<String, Book> bookBatchLoader = | |||
| keys -> { | |||
| ListenableFuture<List<Book>> listenableFuture = | |||
| Futures.transform( | |||
| bookService.listBooks(ListBooksRequest.newBuilder().build()), | |||
| resp -> resp.getBooksList(), | |||
| MoreExecutors.directExecutor()); | |||
| // ServletScopes.transferRequest(() -> ... ); ?? | |||
| return FutureConverter.toCompletableFuture(listenableFuture); | |||
| }; | |||
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| DataLoaderRegistry registry = new DataLoaderRegistry(); | |||
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| registry.register("books", new DataLoader<>(bookBatchLoader)); | |||
| return registry; | |||
| } | |||
| } | |||
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110 changes: 110 additions & 0 deletions
110
...s/src/main/java/com/google/api/graphql/examples/library/graphqlserver/GraphQlServlet.java
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| Original file line number | Original file line | Diff line number | Diff line change |
|---|---|---|---|
| @@ -0,0 +1,110 @@ | |||
| // Copyright 2017 Google LLC | |||
| // | |||
| // 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. | |||
|
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| package com.google.api.graphql.examples.library.graphqlserver; | |||
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| import com.google.api.graphql.execution.GuavaListenableFutureSupport; | |||
| import com.google.api.graphql.rejoiner.Schema; | |||
| import com.google.common.base.Strings; | |||
| import com.google.common.collect.ImmutableMap; | |||
| import com.google.common.io.CharStreams; | |||
| import com.google.gson.Gson; | |||
| import com.google.gson.GsonBuilder; | |||
| import com.google.gson.reflect.TypeToken; | |||
| import graphql.ExecutionInput; | |||
| import graphql.ExecutionResult; | |||
| import graphql.GraphQL; | |||
| import graphql.execution.instrumentation.ChainedInstrumentation; | |||
| import graphql.execution.instrumentation.Instrumentation; | |||
| import graphql.execution.instrumentation.tracing.TracingInstrumentation; | |||
| import graphql.schema.GraphQLSchema; | |||
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| import javax.inject.Inject; | |||
| import javax.inject.Singleton; | |||
| import javax.servlet.http.HttpServlet; | |||
| import javax.servlet.http.HttpServletRequest; | |||
| import javax.servlet.http.HttpServletResponse; | |||
| import java.io.IOException; | |||
| import java.util.Arrays; | |||
| import java.util.HashMap; | |||
| import java.util.Map; | |||
| import java.util.Optional; | |||
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| @Singleton | |||
| class GraphQlServlet extends HttpServlet { | |||
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| private static final Gson GSON = new GsonBuilder().serializeNulls().create(); | |||
| private static final TypeToken<Map<String, Object>> MAP_TYPE_TOKEN = | |||
| new TypeToken<Map<String, Object>>() {}; | |||
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| private static final Instrumentation instrumentation = | |||
| new ChainedInstrumentation( | |||
| Arrays.asList( | |||
| GuavaListenableFutureSupport.listenableFutureInstrumentation(), | |||
| new TracingInstrumentation())); | |||
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| @Inject @Schema GraphQLSchema schema; | |||
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| @Override | |||
| protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException { | |||
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| GraphQL graphql = GraphQL.newGraphQL(schema).instrumentation(instrumentation).build(); | |||
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| Map<String, Object> json = readJson(req); | |||
| String query = (String) json.get("query"); | |||
| if (query == null) { | |||
| resp.setStatus(400); | |||
| return; | |||
| } | |||
| String operationName = (String) json.get("operationName"); | |||
| Map<String, Object> variables = getVariables(json.get("variables")); | |||
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| ExecutionInput executionInput = | |||
| ExecutionInput.newExecutionInput() | |||
| .query(query) | |||
| .operationName(operationName) | |||
| .variables(variables) | |||
| .context(new Object()) | |||
| .build(); | |||
| ExecutionResult executionResult = graphql.execute(executionInput); | |||
| resp.setContentType("application/json"); | |||
| resp.setStatus(HttpServletResponse.SC_OK); | |||
| GSON.toJson(executionResult.toSpecification(), resp.getWriter()); | |||
| } | |||
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| private static Map<String, Object> getVariables(Object variables) { | |||
| Map<String, Object> variablesWithStringKey = new HashMap<>(); | |||
| if (variables instanceof Map) { | |||
| ((Map) variables).forEach((k, v) -> variablesWithStringKey.put(String.valueOf(k), v)); | |||
| } | |||
| return variablesWithStringKey; | |||
| } | |||
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| private static Map<String, Object> readJson(HttpServletRequest request) { | |||
| try { | |||
| String json = CharStreams.toString(request.getReader()); | |||
| return jsonToMap(json); | |||
| } catch (IOException e) { | |||
| throw new RuntimeException(e); | |||
| } | |||
| } | |||
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| private static Map<String, Object> jsonToMap(String json) { | |||
| if (Strings.isNullOrEmpty(json)) { | |||
| return ImmutableMap.of(); | |||
| } | |||
| return Optional.<Map<String, Object>>ofNullable(GSON.fromJson(json, MAP_TYPE_TOKEN.getType())) | |||
| .orElse(ImmutableMap.of()); | |||
| } | |||
| } | |||
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34
...es/src/main/java/com/google/api/graphql/examples/library/graphqlserver/LibrarySchema.java
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