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feat: dot/telemetry: Implement basic telemetry connection (#1497)
* implement telemetry connection server * add telemetry for import block * setup telemetry to use node name from Global config * init telemetry connections based on genesis.json values * fix error message formatting * add tests for telemetry * implement no-telemetry cli flag * fix typos * cleanup error check * create TelemetryEndpoint struct * created connection data struct to hold connection data * make TelemetryEndpoints a pointer reference * add tests for interfaceToTelemetryEndpoint * update test to fix random name
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| // Copyright 2021 ChainSafe Systems (ON) Corp. | ||
| // This file is part of gossamer. | ||
| // | ||
| // The gossamer library is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // The gossamer library is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with the gossamer library. If not, see <http://www.gnu.org/licenses/>. | ||
| package telemetry | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "fmt" | ||
| "math/big" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/ChainSafe/gossamer/lib/genesis" | ||
| "github.com/gorilla/websocket" | ||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| // Handler struct for holding telemetry related things | ||
| type Handler struct { | ||
| buf bytes.Buffer | ||
| wsConn []*websocket.Conn | ||
| telemetryLogger *log.Entry | ||
| } | ||
|
|
||
| // MyJSONFormatter struct for defining JSON Formatter | ||
| type MyJSONFormatter struct { | ||
| } | ||
|
|
||
| // Format function for handling JSON formatting, this overrides default logging formatter to remove | ||
| // log level, line number and timestamp | ||
| func (f *MyJSONFormatter) Format(entry *log.Entry) ([]byte, error) { | ||
| serialized, err := json.Marshal(entry.Data) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to marshal fields to JSON, %w", err) | ||
| } | ||
| return append(serialized, '\n'), nil | ||
| } | ||
|
|
||
| var ( | ||
| once sync.Once | ||
| handlerInstance *Handler | ||
| ) | ||
|
|
||
| // GetInstance singleton pattern to for accessing TelemetryHandler | ||
| func GetInstance() *Handler { | ||
| if handlerInstance == nil { | ||
| once.Do( | ||
| func() { | ||
| handlerInstance = &Handler{ | ||
| buf: bytes.Buffer{}, | ||
| } | ||
| log.SetOutput(&handlerInstance.buf) | ||
| log.SetFormatter(new(MyJSONFormatter)) | ||
| }) | ||
| } | ||
| return handlerInstance | ||
| } | ||
|
|
||
| // AddConnections adds connections to telemetry sever | ||
| func (h *Handler) AddConnections(conns []*genesis.TelemetryEndpoint) { | ||
| for _, v := range conns { | ||
| c, _, err := websocket.DefaultDialer.Dial(v.Endpoint, nil) | ||
| if err != nil { | ||
| fmt.Printf("Error %v\n", err) | ||
| return | ||
| } | ||
| h.wsConn = append(h.wsConn, c) | ||
| } | ||
| } | ||
|
|
||
| // ConnectionData struct to hold connection data | ||
| type ConnectionData struct { | ||
| Authority bool | ||
| Chain string | ||
| GenesisHash string | ||
| SystemName string | ||
| NodeName string | ||
| SystemVersion string | ||
| NetworkID string | ||
| StartTime string | ||
| } | ||
|
|
||
| // SendConnection sends connection request message to telemetry connection | ||
| func (h *Handler) SendConnection(data *ConnectionData) { | ||
| payload := log.Fields{"authority": data.Authority, "chain": data.Chain, "config": "", "genesis_hash": data.GenesisHash, | ||
| "implementation": data.SystemName, "msg": "system.connected", "name": data.NodeName, "network_id": data.NetworkID, "startup_time": data.StartTime, | ||
| "version": data.SystemVersion} | ||
| h.telemetryLogger = log.WithFields(log.Fields{"id": 1, "payload": payload, "ts": time.Now()}) | ||
| h.telemetryLogger.Print() | ||
| h.sendTelemtry() | ||
| } | ||
|
|
||
| // SendBlockImport sends block imported message to telemetry connection | ||
| func (h *Handler) SendBlockImport(bestHash string, height *big.Int) { | ||
| payload := log.Fields{"best": bestHash, "height": height.Int64(), "msg": "block.import", "origin": "NetworkInitialSync"} | ||
| h.telemetryLogger = log.WithFields(log.Fields{"id": 1, "payload": payload, "ts": time.Now()}) | ||
| h.telemetryLogger.Print() | ||
| h.sendTelemtry() | ||
| } | ||
|
|
||
| func (h *Handler) sendTelemtry() { | ||
| for _, c := range h.wsConn { | ||
| err := c.WriteMessage(websocket.TextMessage, h.buf.Bytes()) | ||
| if err != nil { | ||
| // TODO (ed) determine how to handle this error | ||
| fmt.Printf("ERROR connecting to telemetry %v\n", err) | ||
| } | ||
| } | ||
| h.buf.Reset() | ||
| } |
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