We need to track statistics in a client neutral way, since the Google
gRPC client doesn't have upstream stats. This will allow us to track the
gRPC status returned by the remote (or inferred from events such as
client timeouts).
Signed-off-by: Harvey Tuch <htuch@google.com>
In support of https://github.com/envoyproxy/envoy/issues/2200 and some
Google internal needs, we are planning on adding support to Envoy to
allow a configuration (or possibly build) driven decision on whether to
using the existing Envoy in-built Grpc::AsyncClient or
the Google C++ gRPC client library (https://grpc.io/grpc/cpp/index.html).
To move in this direction, the idea is we have the xDS ApiConfigSources,
rate limit service config and other filter configurations point at a
GrpcService object. This can be configured to use an Envoy cluster,
where Grpc::AsyncClient will orchestrate communication, or to contain
the config needed to establish a channel in Google C++ gRPC client
library.
Signed-off-by: Harvey Tuch <htuch@google.com>
Kuat
htuch