mock fails with `TypeError: Cannot read properties of undefined (reading 'isMaster')`

[mitsos1os]

mock fails with `TypeError: Cannot read properties of undefined (reading 'isMaster')`

[captaincoordinates]

I was seeing this issue with the latest release of the stoplight/prism:4 Docker image (released 8 days ago). I pinned the image at stoplight/prism:4.10.3 and the issue went away.

[alexisjanvier]

I confirm that the problem disappears by using the image stoplight/prism:4.10.3

[alan-lee-12]

i can also confirm that i had the same issues when using prism:4 and prism:latest, and the issue was fixed by pinning it to 4.10.3. thanks @captaincoordinates & @alexisjanvier !

[alexisjanvier]

I have the same problem when I try to launch prism in a github workflow

middleware_1  | prism mock <document>
middleware_1  | 
middleware_1  | Start a mock server with the given document file
middleware_1  | 
middleware_1  | Positionals:
middleware_1  |   document  Path to a document file. Can be both a file or a fetchable resource on the web.  [string] [required]
middleware_1  | 
middleware_1  | Options:
middleware_1  |       --version       Show version number  [boolean]
middleware_1  |       --help          Show help  [boolean]
middleware_1  |   -p, --port          Port that Prism will run on.  [number] [required] [default: 4010]
middleware_1  |   -h, --host          Host that Prism will listen to.  [string] [required] [default: "127.0.0.1"]
middleware_1  |       --cors          Enables CORS headers.  [boolean] [default: true]
middleware_1  |   -m, --multiprocess  Forks the http server from the CLI for faster log processing.  [boolean] [default: true]
middleware_1  |       --errors        Specifies whether request/response violations marked as errors will produce an error response  [boolean] [required] [default: false]
middleware_1  |   -d, --dynamic       Dynamically generate examples.  [boolean] [default: false]
middleware_1  | 
middleware_1  | TypeError: Cannot read properties of undefined (reading 'isMaster')
middleware_1  |     at createMultiProcessPrism (/usr/src/prism/packages/cli/dist/util/createServer.js:27:32)
middleware_1  |     at Object.runPrismAndSetupWatcher (/usr/src/prism/packages/cli/dist/util/runner.js:8:12)
middleware_1  |     at Object.handler (/usr/src/prism/packages/cli/dist/commands/mock.js:27:25)
middleware_1  |     at Object.runCommand (/usr/src/prism/node_modules/yargs/build/index.cjs:446:48)
middleware_1  |     at Object.parseArgs [as _parseArgs] (/usr/src/prism/node_modules/yargs/build/index.cjs:2697:57)
middleware_1  |     at Object.get [as argv] (/usr/src/prism/node_modules/yargs/build/index.cjs:2651:25)
middleware_1  |     at Object.<anonymous> (/usr/src/prism/packages/cli/dist/index.js:15:26)
middleware_1  |     at Module._compile (node:internal/modules/cjs/loader:1126:14)
middleware_1  |     at Object.Module._extensions..js (node:internal/modules/cjs/loader:[118]
middleware_1  |     at Module.load (node:internal/modules/cjs/loader:1004:32)
presse-front-e2e_middleware_1 exited with code 1

Prism is started with Docker-Compose :

version: '3.9'

services:
    app:
        image: presse-front
        ports:
            - 1312:3000

    middleware:
        image: stoplight/prism:4
        command: 'mock -h 0.0.0.0 /tmp/api.oas3.yml'
        volumes:
            - ./middleware/api.oas3.yaml:/tmp/api.oas3.yaml:ro

But I don't encounter the problem in local :

➜  lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04.1 LTS
Release:	22.04
Codename:	jammy
➜  docker --version
Docker version 20.10.16, build aa7e414
➜  docker-compose --version
docker-compose version 1.27.4, build 40524192

[chohmann]

Hey team! Please add your planning poker estimate with Zenhub @brendarearden @daniel-white @EdVinyard @fcasad

[gulyas-istvan-netlock-hu]

Hello all!

I have the reported issue with 4.10.4, but it is sporadic :(

I have read you use cluster.isMaster but it is deprecated, can you use cluster.isPrimary? I cannot prove it is the root cause, but the sporadic failing is not a production usage :(

[gulyas-istvan-netlock-hu]

rollback to 4.10.2 solves my problem
thanks to @fcasad notes: #2143

[fcasad]

Hi everyone,
Sorry you were affected by the regression in 4.10.4! It should be resolved in 4.10.5.