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apollo-federation-service-outage-test

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1952d042afef95a78f292418ecc0011fd5113e11

Initial commit

hhaines committed 4 years ago

README

The README file for this repository.

apollo-federation-service-outage-test

An Apollo gateway backed by two services, foo and bar. foo is flaky - for 10 seconds it throws errors, then it shuts down altogether.

Usage

Start the gateway and backing services:

$ yarn install
$ yarn start

In another console tab:

$ yarn query

Results

The gateway resolves the query, returning a 200 status code and including both data and errors in the response.

data.foo is null because of the failure to resolve, but data.bar is populated successfully.

errors includes the details of the failure.

For the first 10 seconds, when foo throws an error

HTTP/1.1 200 OK
Access-Control-Allow-Origin: *
Content-Type: application/json; charset=utf-8
Content-Length: 1344
ETag: W/"540-fSW2ujoVdiUxkjqDtBpGL1ycW8Q"
Date: Fri, 25 Sep 2020 13:30:00 GMT
Connection: keep-alive

{
  "errors": [
    {
      "message": "💥",
      "path": [
        "foo"
      ],
      "extensions": {
        "code": "INTERNAL_SERVER_ERROR",
        "serviceName": "foo",
        "query": "{foo}",
        "variables": {},
        "exception": {
          "stacktrace": [
            "Error: 💥",
            "    at foo (/Users/andrew/zencargo/federation-test/index.js:15:17)",
            "    at field.resolve (/Users/andrew/zencargo/federation-test/node_modules/graphql-extensions/dist/index.js:134:26)",
            "    at field.resolve (/Users/andrew/zencargo/federation-test/node_modules/apollo-server-core/dist/utils/schemaInstrumentation.js:52:26)",
            "    at resolveFieldValueOrError (/Users/andrew/zencargo/federation-test/node_modules/graphql/execution/execute.js:502:18)",
            "    at resolveField (/Users/andrew/zencargo/federation-test/node_modules/graphql/execution/execute.js:460:16)",
            "    at executeFields (/Users/andrew/zencargo/federation-test/node_modules/graphql/execution/execute.js:297:18)",
            "    at executeOperation (/Users/andrew/zencargo/federation-test/node_modules/graphql/execution/execute.js:241:122)",
            "    at executeImpl (/Users/andrew/zencargo/federation-test/node_modules/graphql/execution/execute.js:119:14)",
            "    at Object.execute (/Users/andrew/zencargo/federation-test/node_modules/graphql/execution/execute.js:63:35)",
            "    at /Users/andrew/zencargo/federation-test/node_modules/apollo-server-core/dist/requestPipeline.js:249:48"
          ]
        }
      }
    }
  ],
  "data": {
    "foo": null,
    "bar": "bar"
  }
}

After 10 seconds, when foo is down

HTTP/1.1 200 OK
Access-Control-Allow-Origin: *
Content-Type: application/json; charset=utf-8
Content-Length: 783
ETag: W/"30f-MZKDS9FEIPUpd7ZKWyXul2/Gzbc"
Date: Fri, 25 Sep 2020 13:49:20 GMT
Connection: keep-alive

{
  "errors": [
    {
      "message": "request to http://localhost:4001/ failed, reason: connect ECONNREFUSED 127.0.0.1:4001",
      "extensions": {
        "code": "INTERNAL_SERVER_ERROR",
        "exception": {
          "stacktrace": [
            "FetchError: request to http://localhost:4001/ failed, reason: connect ECONNREFUSED 127.0.0.1:4001",
            "    at ClientRequest.<anonymous> (/Users/andrew/zencargo/federation-test/node_modules/node-fetch/lib/index.js:1461:11)",
            "    at ClientRequest.emit (events.js:315:20)",
            "    at Socket.socketErrorListener (_http_client.js:426:9)",
            "    at Socket.emit (events.js:315:20)",
            "    at emitErrorNT (internal/streams/destroy.js:92:8)",
            "    at emitErrorAndCloseNT (internal/streams/destroy.js:60:3)",
            "    at processTicksAndRejections (internal/process/task_queues.js:84:21)"
          ]
        }
      }
    }
  ],
  "data": {
    "foo": null,
    "bar": "bar"
  }
}