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/*
 * 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.skywalking.oap.query.graphql;

import com.coxautodev.graphql.tools.SchemaParser;
import graphql.GraphQL;
import graphql.schema.GraphQLSchema;
import org.apache.skywalking.oap.query.graphql.resolver.AggregationQuery;
import org.apache.skywalking.oap.query.graphql.resolver.AlarmQuery;
import org.apache.skywalking.oap.query.graphql.resolver.BrowserLogQuery;
import org.apache.skywalking.oap.query.graphql.resolver.EventQuery;
import org.apache.skywalking.oap.query.graphql.resolver.HealthQuery;
import org.apache.skywalking.oap.query.graphql.resolver.LogQuery;
import org.apache.skywalking.oap.query.graphql.resolver.LogTestQuery;
import org.apache.skywalking.oap.query.graphql.resolver.MetadataQuery;
import org.apache.skywalking.oap.query.graphql.resolver.MetricQuery;
import org.apache.skywalking.oap.query.graphql.resolver.MetricsQuery;
import org.apache.skywalking.oap.query.graphql.resolver.Mutation;
import org.apache.skywalking.oap.query.graphql.resolver.ProfileMutation;
import org.apache.skywalking.oap.query.graphql.resolver.ProfileQuery;
import org.apache.skywalking.oap.query.graphql.resolver.Query;
import org.apache.skywalking.oap.query.graphql.resolver.TopNRecordsQuery;
import org.apache.skywalking.oap.query.graphql.resolver.TopologyQuery;
import org.apache.skywalking.oap.query.graphql.resolver.TraceQuery;
import org.apache.skywalking.oap.query.graphql.resolver.UIConfigurationManagement;
import org.apache.skywalking.oap.server.core.CoreModule;
import org.apache.skywalking.oap.server.core.query.QueryModule;
import org.apache.skywalking.oap.server.core.server.JettyHandlerRegister;
import org.apache.skywalking.oap.server.library.module.ModuleConfig;
import org.apache.skywalking.oap.server.library.module.ModuleDefine;
import org.apache.skywalking.oap.server.library.module.ModuleProvider;
import org.apache.skywalking.oap.server.library.module.ModuleStartException;
import org.apache.skywalking.oap.server.library.module.ServiceNotProvidedException;

/**
 * GraphQL query provider.
 */
public class GraphQLQueryProvider extends ModuleProvider {

    private final GraphQLQueryConfig config = new GraphQLQueryConfig();

    private GraphQL graphQL;

    @Override
    public String name() {
        return "graphql";
    }

    @Override
    public Class module() {
        return QueryModule.class;
    }

    @Override
    public ModuleConfig createConfigBeanIfAbsent() {
        return config;
    }

    @Override
    public void prepare() throws ServiceNotProvidedException, ModuleStartException {
        GraphQLSchema schema = SchemaParser.newParser()
                                           .file("query-protocol/common.graphqls")
                                           .resolvers(new Query(), new Mutation(), new HealthQuery(getManager()))
                                           .file("query-protocol/metadata.graphqls")
                                           .resolvers(new MetadataQuery(getManager()))
                                           .file("query-protocol/topology.graphqls")
                                           .resolvers(new TopologyQuery(getManager()))
                                           /*
                                            * Metrics v2 query protocol is an alternative metrics query(s) of original v1,
                                            * defined in the metric.graphql, top-n-records.graphqls, and aggregation.graphqls.
                                            */
                                           .file("query-protocol/metrics-v2.graphqls")
                                           .resolvers(new MetricsQuery(getManager()))
                                           ////////
                                           //Deprecated Queries
                                           ////////
                                           .file("query-protocol/metric.graphqls")
                                           .resolvers(new MetricQuery(getManager()))
                                           .file("query-protocol/aggregation.graphqls")
                                           .resolvers(new AggregationQuery(getManager()))
                                           .file("query-protocol/top-n-records.graphqls")
                                           .resolvers(new TopNRecordsQuery(getManager()))
                                           ////////
                                           .file("query-protocol/trace.graphqls")
                                           .resolvers(new TraceQuery(getManager()))
                                           .file("query-protocol/alarm.graphqls")
                                           .resolvers(new AlarmQuery(getManager()))
                                           .file("query-protocol/log.graphqls")
                                           .resolvers(new LogQuery(getManager()),
                                                      new LogTestQuery(getManager(), config))
                                           .file("query-protocol/profile.graphqls")
                                           .resolvers(new ProfileQuery(getManager()), new ProfileMutation(getManager()))
                                           .file("query-protocol/ui-configuration.graphqls")
                                           .resolvers(new UIConfigurationManagement(getManager()))
                                           .file("query-protocol/browser-log.graphqls")
                                           .resolvers(new BrowserLogQuery(getManager()))
                                           .file("query-protocol/event.graphqls")
                                           .resolvers(new EventQuery(getManager()))
                                           .build()
                                           .makeExecutableSchema();
        this.graphQL = GraphQL.newGraphQL(schema).build();
    }

    @Override
    public void start() throws ServiceNotProvidedException, ModuleStartException {
        JettyHandlerRegister service = getManager().find(CoreModule.NAME)
                                                   .provider()
                                                   .getService(JettyHandlerRegister.class);
        service.addHandler(new GraphQLQueryHandler(config.getPath(), graphQL));
    }

    @Override
    public void notifyAfterCompleted() throws ServiceNotProvidedException, ModuleStartException {

    }

    @Override
    public String[] requiredModules() {
        return new String[0];
    }
}




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