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26 lines
1.1 KiB
Go
26 lines
1.1 KiB
Go
// Copyright 2017 Michal Witkowski. All Rights Reserved.
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// See LICENSE for licensing terms.
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package proxy
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import (
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"context"
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"google.golang.org/grpc"
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)
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// StreamDirector returns a gRPC ClientConn to be used to forward the call to.
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//
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// The presence of the `Context` allows for rich filtering, e.g. based on Metadata (headers).
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// If no handling is meant to be done, a `codes.NotImplemented` gRPC error should be returned.
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//
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// The context returned from this function should be the context for the *outgoing* (to backend) call. In case you want
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// to forward any Metadata between the inbound request and outbound requests, you should do it manually. However, you
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// *must* propagate the cancel function (`context.WithCancel`) of the inbound context to the one returned.
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//
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// It is worth noting that the StreamDirector will be fired *after* all server-side stream interceptors
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// are invoked. So decisions around authorization, monitoring etc. are better to be handled there.
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//
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// See the rather rich example.
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type StreamDirector func(ctx context.Context, fullMethodName string) (context.Context, grpc.ClientConnInterface, error)
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