apollo-opentracing

import { ApolloServer } from '@apollo/server'; import { startStandaloneServer } from '@apollo/server/standalone'; import { gql } from 'graphql-tag'; import OpentracingPlugin from 'apollo-opentracing'; import { MockTracer } from 'opentracing/lib/mock_tracer'; // Using a mock tracer for example // Initialize OpenTracing tracers const serverTracer = new MockTracer(); const localTracer = new MockTracer(); // Define your GraphQL schema const typeDefs = gql` type Book { title: String author: String } type Query { books: [Book] hello: String } `; // Define your resolvers const resolvers = { Query: { books: () => [ { title: 'The Great Gatsby', author: 'F. Scott Fitzgerald' }, { title: 'To Kill a Mockingbird', author: 'Harper Lee' }, ], hello: (parent, args, context, info) => { // Access the current span from info.span if needed if (info.span) { info.span.log({ event: 'hello-resolver-executed' }); } return 'Hello, GraphQL!'; }, }, }; async function startApolloServer() { const server = new ApolloServer({ typeDefs, resolvers, plugins: [ OpentracingPlugin({ server: serverTracer, local: localTracer, // Optional: conditionally trace requests shouldTraceRequest: (requestContext) => { return requestContext.request.operationName !== 'IntrospectionQuery'; }, // Optional: conditionally trace field resolvers shouldTraceFieldResolver: (source, args, context, info) => { return info.fieldName !== '__typename'; } }), ], }); const { url } = await startStandaloneServer(server, { listen: { port: 4000 }, }); console.log(`🚀 Server ready at ${url}`); console.log('Perform a GraphQL query (e.g., query { books { title } }) and check tracer logs.'); // In a real application, you would export or periodically report spans from your tracer // For MockTracer, you can access finished spans directly: // console.log('Finished Spans:', serverTracer.finishedSpans()); } startApolloServer();