| /* |
| * 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.sling.scripting.gql.engine; |
| |
| import javax.script.ScriptException; |
| |
| import graphql.ExecutionInput; |
| import graphql.language.Comment; |
| import graphql.language.FieldDefinition; |
| import graphql.language.ObjectTypeDefinition; |
| import org.apache.sling.api.resource.Resource; |
| import org.apache.sling.graphql.api.SchemaProvider; |
| import org.apache.sling.scripting.gql.schema.DataFetcherDefinition; |
| import org.apache.sling.scripting.gql.schema.DataFetcherSelector; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import graphql.ExecutionResult; |
| import graphql.GraphQL; |
| import graphql.schema.DataFetcher; |
| import graphql.schema.GraphQLSchema; |
| import graphql.schema.idl.RuntimeWiring; |
| import graphql.schema.idl.SchemaGenerator; |
| import graphql.schema.idl.SchemaParser; |
| import graphql.schema.idl.TypeDefinitionRegistry; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** Run a GraphQL query in the context of a Sling Resource */ |
| public class GraphQLResourceQuery { |
| |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| |
| public ExecutionResult executeQuery(SchemaProvider schemaProvider, DataFetcherSelector fetchers, |
| Resource r, String query) throws ScriptException { |
| return executeQuery(schemaProvider, fetchers, r, query, Collections.emptyMap()); |
| } |
| |
| public ExecutionResult executeQuery(SchemaProvider schemaProvider, DataFetcherSelector fetchers, |
| Resource r, String query, Map<String, Object> variables) throws ScriptException { |
| if(r == null) { |
| throw new ScriptException("Resource is null"); |
| } |
| if(query == null) { |
| throw new ScriptException("Query is null"); |
| } |
| if(schemaProvider == null) { |
| throw new ScriptException("SchemaProvider is null"); |
| } |
| |
| String schemaDef = null; |
| try { |
| schemaDef = schemaProvider.getSchema(r, null); |
| } catch(Exception e) { |
| final ScriptException up = new ScriptException("Schema provider failed"); |
| up.initCause(e); |
| throw up; |
| } |
| log.info("Resource {} maps to GQL schema {}", r.getPath(), schemaDef); |
| try { |
| final GraphQLSchema schema = buildSchema(schemaDef, fetchers, r); |
| final GraphQL graphQL = GraphQL.newGraphQL(schema).build(); |
| ExecutionInput ei = ExecutionInput.newExecutionInput() |
| .query(query) |
| .variables(variables) |
| .build(); |
| final ExecutionResult result = graphQL.execute(ei); |
| return result; |
| } catch(Exception e) { |
| final ScriptException up = new ScriptException( |
| String.format("Query failed for Resource %s: schema=%s, query=%s", r.getPath(), schemaDef, query)); |
| up.initCause(e); |
| throw up; |
| } |
| } |
| |
| private GraphQLSchema buildSchema(String sdl, DataFetcherSelector fetchers, Resource r) { |
| TypeDefinitionRegistry typeRegistry = new SchemaParser().parse(sdl); |
| RuntimeWiring runtimeWiring = buildWiring(typeRegistry, fetchers, r); |
| SchemaGenerator schemaGenerator = new SchemaGenerator(); |
| return schemaGenerator.makeExecutableSchema(typeRegistry, runtimeWiring); |
| } |
| |
| private RuntimeWiring buildWiring(TypeDefinitionRegistry typeRegistry, DataFetcherSelector fetchers, Resource r) { |
| List<ObjectTypeDefinition> types = typeRegistry.getTypes(ObjectTypeDefinition.class); |
| RuntimeWiring.Builder builder = RuntimeWiring.newRuntimeWiring(); |
| for (ObjectTypeDefinition type : types) { |
| |
| builder.type(type.getName(), typeWiring -> { |
| for (FieldDefinition field : type.getFieldDefinitions()) { |
| |
| DataFetcher<Object> fetcher = getDataFetcher(field, fetchers, r); |
| if (fetcher != null) { |
| typeWiring.dataFetcher(field.getName(), fetcher); |
| } |
| } |
| return typeWiring; |
| }); |
| } |
| return builder.build(); |
| } |
| |
| private DataFetcher<Object> getDataFetcher(FieldDefinition field, DataFetcherSelector fetchers, |
| Resource r) { |
| List<Comment> comments = field.getComments(); |
| for (Comment comment : comments) { |
| |
| String commentStr = comment.getContent(); |
| if (commentStr.startsWith("#")) { |
| commentStr = commentStr.substring(1).trim(); |
| |
| try { |
| DataFetcherDefinition def = new DataFetcherDefinition(commentStr); |
| DataFetcher<Object> fetcher = fetchers.getDataFetcherForType(def, r); |
| if (fetcher != null) { |
| return fetcher; |
| } else { |
| log.warn("No data fetcher registered for {}", def.toString()); |
| } |
| } catch (IllegalArgumentException iae) { |
| log.warn("Invalid fetcher definition", iae); |
| } |
| } |
| } |
| return null; |
| } |
| |
| } |