Local web build fails with no Internet connection

Where to find the issue

This repository https://github.com/corona-warn-app/cwa-website.

Describe the issue

Attempting to build a local copy of the web to test, when no internet connection is available, fails with an error message:

FetchError: request to https://obs.eu-de.otc.t-systems.com/obs-public-dashboard/json/v1/nested_cwa_public_dashboard_data.json failed, reason: getaddrinfo ENOTFOUND obs.eu-de.otc.t-systems.com

Another error occurs if there is an internet connection but the json file cannot be fetched fast enough. Unfortunately I didn’t save this error message. The error message is something like public//analyseData.json not found.

Steps to reproduce

1. On a local system enable flight mode i.e. no internet connection
2. Type npm start at a bash command prompt

$ npm start

> corona-warn-app-landingpage@1.0.0 start C:\Users\mikem\github\cwa-website
> gulp

[19:04:49] Using gulpfile ~\github\cwa-website\gulpfile.js
[19:04:49] Starting 'default'...
[19:04:49] Starting 'build'...
[19:04:49] Starting 'clean'...
[19:04:49] Finished 'clean' after 15 ms
[19:04:49] Starting 'cleanBlogs'...
[19:04:49] Finished 'cleanBlogs' after 83 ms
[19:04:49] Starting 'cleanScienceBlogs'...
[19:04:49] Finished 'cleanScienceBlogs' after 5.5 ms
[19:04:49] Starting 'buildBlogFiles'...
[19:04:50] Finished 'buildBlogFiles' after 681 ms
[19:04:50] Starting 'buildScienceBlogFiles'...
[19:04:50] Finished 'buildScienceBlogFiles' after 352 ms
[19:04:50] Starting 'analyseData'...
[19:04:50] 'analyseData' errored after 85 ms
[19:04:50] FetchError: request to https://obs.eu-de.otc.t-systems.com/obs-public-dashboard/json/v1/nested_cwa_public_dashboard_data.json failed, reason: getaddrinfo ENOTFOUND obs.eu-de.otc.t-systems.com
    at ClientRequest.<anonymous> (C:\Users\mikem\github\cwa-website\node_modules\node-fetch\lib\index.js:1483:11)
    at ClientRequest.emit (events.js:400:28)
    at ClientRequest.emit (domain.js:470:12)
    at TLSSocket.socketErrorListener (_http_client.js:475:9)
    at TLSSocket.emit (events.js:400:28)
    at TLSSocket.emit (domain.js:470:12)
    at emitErrorNT (internal/streams/destroy.js:106:8)
    at emitErrorCloseNT (internal/streams/destroy.js:74:3)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)
[19:04:50] 'build' errored after 1.23 s
[19:04:50] 'default' errored after 1.23 s

Expected behavior

It should be possible to build the web reproducibly using a clone of the repository without downloading any dynamic information from another source, therefore it should be possible to build the web without an internet connection.

Suggested change

Remove the reliance on accessing a remote file during build which is not part of the committed git controlled repository on https://github.com/corona-warn-app/cwa-website.

[MikeMcC399]

@dsarkar / @brifemu

I tested successfully on Windows 10 in flight mode.

npm start completes the build successfully and runs the webserver

Also the http://localhost:8000/de/analysis/ page shows data and can be used to test this page.

Thank you very much for addressing this!

[dsarkar]

@MikeMcC399 FYI PR https://github.com/corona-warn-app/cwa-website/pull/1942