Proxying sumdb behind a proxy or upstream

[wayjam]

Describe the solution you'd like
Now SumDBs will proxy sumdb direct to the accually sumdb server insteads of behine the value of GlobalEndpoint

SumDBs = ["https://sum.golang.org"]  => the sumdb id is sum.golang.org
SumDBs = ["https://goproxy.cn/sumdb/sum.golang.org"]  => the sumdb id is goproxy.cn

Describe alternatives you've considered

What 's the best way to describe?

1. if the SumDB match https://(?<proxyHost>.*)/sumdb/(?<sumdb id>.*), use id sumdb id
2. all sumdb will try if upstream server support, then proxy to upstream/sumdb/id

[arschles]

@wayjam if Athens is proxying to a sum DB, would you want it to cache results locally?

[wayjam]

@arschles I think just a reverse proxy or a middleware with cache are both fine. And if athens can provide two options ideally.

[arschles]

@wayjam I see. That sounds like it could work! We would never have to expire the cache either, which makes this a lot easier.

Would you like to prototype this? No pressure at all if you don't. Just let me know

[will-beta]

@arschles Does it mean the Athens could not utilize GOSUMDB in the ATHENS_GO_BINARY_ENV_VARS?

https://sum.golang.org is not accessible in China apparently.

Just ran the server with the config.dev.toml and the envs below:

"ATHENS_LOG_LEVEL":"trace",
"ATHENS_DOWNLOAD_MODE":"async_redirect",
"ATHENS_DOWNLOAD_URL":"https://goproxy.cn",
"ATHENS_SUM_DBS":"https://sum.golang.org",
"ATHENS_GO_BINARY_ENV_VARS":"GOPROXY=https://goproxy.cn,direct; GOSUMDB=sum.golang.google.cn",

Got the error messages on the client side when I ran go get golang.org/x/tools/gopls@v0.7.0 :

go get: golang.org/x/tools/gopls@v0.7.0: verifying module: golang.org/x/tools/gopls@v0.7.0: initializing sumdb.Client: checking tree#5772989: reading http://127.0.0.1:3000/sumdb/sum.golang.org/tile/8/2/000.p/88: 502 Bad Gateway