Enabling connection keepalive?

[ntindall]

I know the grpc-go has support for connection keepalive in the client. Is there anything similar in the grpc-node client (or does it need to be added?).

Asking because searching for "keepalive" in this repository yields nothing and I cannot find any documentation on the matter.

https://github.com/grpc/grpc-go/blob/master/keepalive/keepalive.go#L31

[murgatroid99]

This implementation has some client configuration options that serve the same purpose. These channel arguments are listed in this header file. The primary relevant keepalive arguments are "grpc.keepalive_time_ms", "grpc.keepalive_timeout_ms", and "grpc.keepalive_permit_without_calls". Some other arguments that may be useful are "grpc.max_connection_idle_ms", "grpc.max_connection_age_ms", "grpc.http2.min_time_between_pings_ms", and "grpc.http2.min_ping_interval_without_data_ms". These arguments are passed in an object in the Client constructor.

[dio]

@murgatroid99 something like:

var client = new services.GreeterClient('localhost:50051',
                                          grpc.credentials.createInsecure(), 
                                         { "grpc.keepalive_timeout_ms": 1500 }
);

?

[ntindall]

@dio I was able to confirm the above works by enabling grpc debugging environment variables.

https://github.com/grpc/grpc/blob/master/doc/environment_variables.md

[siacomuzzi]

@murgatroid99 do you know how I can retrieve the default values for the following options?

• "grpc.keepalive_time_ms"
• "grpc.keepalive_timeout_ms"
• "grpc.keepalive_permit_without_calls"
• "grpc.max_connection_idle_ms
• "grpc.max_connection_age_ms"
• "grpc.http2.min_time_between_pings_ms"
• "grpc.http2.min_ping_interval_without_data_ms"

I'm using grpc@1.8.4

[dio]

Since I'm not aware of handy docs (maybe I'm just not lucky enough to find it), I do search for those keys inside the repo.

@siacomuzzi most of those keys (flags) are defined in https://github.com/grpc/grpc/blob/master/include/grpc/impl/codegen/grpc_types.h

e.g. for grpc.keepalive_time_ms it is defined as: GRPC_ARG_KEEPALIVE_TIME_MS https://github.com/grpc/grpc/blob/master/include/grpc/impl/codegen/grpc_types.h#L215-L217

Then you can search it in the repo hehe. For GRPC_ARG_KEEPALIVE_TIME_MS, it is handled in this function: https://github.com/grpc/grpc/blob/master/src/core/ext/transport/chttp2/transport/chttp2_transport.cc#L2525

[nicolasnoble]

I think this one can be closed.