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Merge pull request Blockdaemon#24 from Blockdaemon/consensus-tracker
sidecar: add consensus API
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| // Copyright 2022 Blockdaemon Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package sidecar | ||
|
|
||
| import ( | ||
| "io" | ||
| "net/http" | ||
|
|
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| "github.com/gagliardetto/solana-go/rpc/ws" | ||
| "github.com/gin-gonic/gin" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
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| // ConsensusHandler implements the consensus-related sidecar API methods. | ||
| type ConsensusHandler struct { | ||
| RpcWsUrl string | ||
| Log *zap.Logger | ||
| } | ||
|
|
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| // NewConsensusHandler creates a new sidecar consensus API handler using the provided WS RPC and logger. | ||
| func NewConsensusHandler(rpcWsUrl string, log *zap.Logger) *ConsensusHandler { | ||
| return &ConsensusHandler{ | ||
| RpcWsUrl: rpcWsUrl, | ||
| Log: log, | ||
| } | ||
| } | ||
|
|
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| // RegisterHandlers registers this API with Gin web framework. | ||
| func (h *ConsensusHandler) RegisterHandlers(group gin.IRoutes) { | ||
| group.GET("/slot_updates", h.GetSlotUpdates) | ||
| } | ||
|
|
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| // GetSlotUpdates streams RPC "slotsUpdatesSubscribe" events via SSE. | ||
| func (h *ConsensusHandler) GetSlotUpdates(c *gin.Context) { | ||
| ctx := c.Request.Context() | ||
|
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| conn, err := ws.Connect(ctx, h.RpcWsUrl) | ||
| if err != nil { | ||
| h.Log.Error("Failed to connect to Solana RPC WebSocket", zap.Error(err)) | ||
| c.AbortWithStatus(http.StatusBadGateway) | ||
| return | ||
| } | ||
| defer conn.Close() | ||
|
|
||
| go func() { | ||
| <-ctx.Done() | ||
| conn.Close() | ||
| }() | ||
|
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| slotUpdates, err := conn.SlotsUpdatesSubscribe() | ||
| if err != nil { | ||
| h.Log.Error("Failed to connect to subscribe to slot updates", zap.Error(err)) | ||
| c.AbortWithStatus(http.StatusServiceUnavailable) | ||
| return | ||
| } | ||
| defer slotUpdates.Unsubscribe() | ||
|
|
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| c.Stream(func(w io.Writer) bool { | ||
| update, err := slotUpdates.Recv() | ||
| if err != nil { | ||
| h.Log.Error("Failed to receive slot update event", zap.Error(err)) | ||
| return false | ||
| } | ||
| c.SSEvent("slot_update", update) | ||
| return true | ||
| }) | ||
| } |
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