Hi
I am planning to build a grpc-reverse proxy that sits in fronts of a few of
our grpc services.
*Requirement:*
We have a client A that at the moment talks to B or C (based on internal
logic). We want to move this logic to the proxy layer.
So we will introduce a new grpc-reverse-proxy server P sitting in front of
B and C and redirect requests based on the headers passed and the
application logic. Below is how I'm thinking of designing it-
A (starts calls to P with custom headers )
-> P
- Implements ServerCallHandler to read headers and run application
logic
- Has 2 channel objects that it uses to connect to B & C as a client
- Based on the logic proxies the request to either B or C
-> B or C
- Processes the request and returns the response back to P
-> P
- Proxies the response back to A
I have leveraged some of the code from here -
https://github.com/ejona86/grpc-java/commit/29728aeb003ced3c190197c176563643be22bef1,
to build the logic described above and it works.
I couldn't find a lot of documentation on how the client and server in gRPC
internally talk to each other and what are the best practices when writing
your own ServerCallHandler, ClientCall.Listener and ServerCall.Listener;
particularly a sequence diagram of how startCall(), onMessage(),
onHalfClose(), onCancel() and onReady() are called and what are the
guarantees gRPC provides.
I would like to know if my approach to tackle the requirement sounds
acceptable and whether there are things that I should take into
consideration when building this solution. One thing for example is that
the clients will have to create a new stub for each request to add custom
headers before starting a call. Is this good or bad? I don't see any
problem with it in terms of how gRPC works but would like to know if it
will break something I'm not aware about.
Thanks
Chetan
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