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hRPC and why we moved away from gRPC

Submitted by Roy Schestowitz on Sunday 31st of January 2021 11:43:06 PM Filed under
Software

gRPC has a very, very big flaw for publically facing services: streams play awfully with reverse proxies like nginx, as they're essentially HTTP2 requests that aren't closed. This causes proxies to be like “hmmm this is a slow loris attack, time to yeet this stream.” For our homeserver at https://harmonyapp.io, this means we had to configure nginx to be ok with requests taking an entire hour. Any streams would always terminate at exactly 60 minutes. To be fair to gRPC, there's a dedicated HTTP2 streams thing being worked on that would allow reverse proxies like nginx to play nice with it, but unfortunately that's not the case now.

Besides that, gRPC's client libraries, while widely available, range from mediocre to [ censored ] awful. gRPC is a Google product that isn't Go, which means that “error handling” is not a word in its dictionary. This has really bad implications for the C++/Qt client, Challah. Essentially, if anything goes marginally wrong, the client just straight up aborts. There is no way for us to gracefully recover from any errors that originate from the gRPC library. This is terrible for the user experience, as we can't even show a “something is going wrong” page. This is one of the big reasons we're moving away from gRPC: we cannot have our only desktop client be crashing on anything slightly less than perfect network conditions.

That wouldn't be a problem, if making our own implementation of gRPC was easy. Unfortunately, it's not. Remember the part where I said it used low-level HTTP2 a lot? Yeah, that gets very complicated very fast.

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