Client RPC Endpoints, Server Routing and Streaming RPCs #3892
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This PR enables the client to listen for new connections and then bind an RPC listener to each connection in an upcoming PR.
This PR fixes an issue where if the client has multiple connections to a server, a single connection closing would cause the routing to the node to be lost.
Add TLS to streaming RPCs
This was referenced Mar 12, 2018
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notnoop
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Jan 31, 2020
MultiplexV2 is a new connection multiplex header that supports multiplex both RPC and streaming requests over the same Yamux connection. MultiplexV2 was added in 0.8.0 as part of #3892 . So Nomad 0.11 can expect it to be supported. Though, some more rigorous testing is required before merging this. I want to call out some implementation details: First, the current connection pool reuses the Yamux stream for multiple RPC calls, and doesn't close them until an error is encountered. This commit doesn't change it, and sets the `RpcNomad` byte only at stream creation. Second, the StreamingRPC session gets closed by callers and cannot be reused. Every StreamingRPC opens a new Yamux session.
notnoop
pushed a commit
that referenced
this pull request
Feb 4, 2020
MultiplexV2 is a new connection multiplex header that supports multiplex both RPC and streaming requests over the same Yamux connection. MultiplexV2 was added in 0.8.0 as part of #3892 . So Nomad 0.11 can expect it to be supported. Though, some more rigorous testing is required before merging this. I want to call out some implementation details: First, the current connection pool reuses the Yamux stream for multiple RPC calls, and doesn't close them until an error is encountered. This commit doesn't change it, and sets the `RpcNomad` byte only at stream creation. Second, the StreamingRPC session gets closed by callers and cannot be reused. Every StreamingRPC opens a new Yamux session.
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This PR introduces client RPC endpoints that can be accessed via the servers by re-using pre-established connections between Nomad Servers and Clients. Further a streaming RPC mechanism has been introduced which allows allocation logs to be streamed via RPC.
The end result is that Nomad servers can now service client specific HTTP endpoints and the CLI does not need to be able to resolve the HTTP address of Nomad clients in order to call their APIs.