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feat: add GRPC reverse tunnel server
Allow Omni API clients to receive GRPC calls in the reverse direction, `Omni->Client`. Might be used by the infra providers, e.g., bare-metal infra provider. Signed-off-by: Utku Ozdemir <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| // Copyright (c) 2024 Sidero Labs, Inc. | ||
| // | ||
| // Use of this software is governed by the Business Source License | ||
| // included in the LICENSE file. | ||
|
|
||
| // Package baremetal provides a client to interact with the bare-metal infra provider. | ||
| package baremetal | ||
|
|
||
| import ( | ||
| "github.com/jhump/grpctunnel" | ||
| "go.uber.org/zap" | ||
| "google.golang.org/grpc/metadata" | ||
| ) | ||
|
|
||
| const ( | ||
| // ProviderIDMetadataKey is the key used to identify the infra provider ID in the GRPC metadata (header). | ||
| ProviderIDMetadataKey = "provider-id" | ||
|
|
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| unknownProviderID = "unknown" | ||
| ) | ||
|
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| // GetAffinityKey extracts the AffinityKey from the given GRPC tunnel context. | ||
| func GetAffinityKey(channel grpctunnel.TunnelChannel, logger *zap.Logger) string { | ||
| md, ok := metadata.FromIncomingContext(channel.Context()) | ||
| if !ok { | ||
| logger.Warn("no metadata found in channel context") | ||
|
|
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| return unknownProviderID | ||
| } | ||
|
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| vals := md.Get(ProviderIDMetadataKey) | ||
| if len(vals) == 0 { | ||
| logger.Warn("no provider ID found in metadata") | ||
|
|
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| return unknownProviderID | ||
| } | ||
|
|
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| if len(vals) > 1 { | ||
| logger.Warn("multiple provider IDs found in metadata, using the first one", zap.Strings("provider_ids", vals)) | ||
| } | ||
|
|
||
| return vals[0] | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| // Copyright (c) 2024 Sidero Labs, Inc. | ||
| // | ||
| // Use of this software is governed by the Business Source License | ||
| // included in the LICENSE file. | ||
|
|
||
| package grpc | ||
|
|
||
| import ( | ||
| "context" | ||
|
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| gateway "github.com/grpc-ecosystem/grpc-gateway/v2/runtime" | ||
| "github.com/jhump/grpctunnel" | ||
| "github.com/jhump/grpctunnel/tunnelpb" | ||
| "google.golang.org/grpc" | ||
| ) | ||
|
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| type tunnelServer struct { | ||
| handler *grpctunnel.TunnelServiceHandler | ||
| } | ||
|
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| func (t *tunnelServer) register(server grpc.ServiceRegistrar) { | ||
| service := t.handler.Service() | ||
|
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| tunnelpb.RegisterTunnelServiceServer(server, service) | ||
| } | ||
|
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| func (t *tunnelServer) gateway(context.Context, *gateway.ServeMux, string, []grpc.DialOption) error { | ||
| // no-op - don't register a gateway for the tunnel service | ||
| return nil | ||
| } |
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