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monitor/finality: add slack alert for fast finality rule violation (a…
…xieinfinity#356) The slack webhook URL for alerting is input via the environment variable SLACK_WEBHOOK_URL.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| package monitor | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "errors" | ||
| "net/http" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "github.com/ethereum/go-ethereum/log" | ||
| ) | ||
|
|
||
| const reponseBuffer = 2048 | ||
|
|
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| type slackAlerter struct { | ||
| url string | ||
| client *http.Client | ||
| } | ||
|
|
||
| func formatMessage(header, body string) string { | ||
| headerSection := map[string]interface{}{ | ||
| "type": "header", | ||
| "text": map[string]interface{}{ | ||
| "type": "plain_text", | ||
| "text": header, | ||
| "emoji": true, | ||
| }, | ||
| } | ||
|
|
||
| bodySection := map[string]interface{}{ | ||
| "type": "section", | ||
| "text": map[string]interface{}{ | ||
| "type": "plain_text", | ||
| "text": body, | ||
| "emoji": true, | ||
| }, | ||
| } | ||
|
|
||
| messageBlock := map[string]interface{}{ | ||
| "blocks": []interface{}{ | ||
| headerSection, | ||
| bodySection, | ||
| }, | ||
| } | ||
|
|
||
| message, _ := json.Marshal(messageBlock) | ||
| return string(message) | ||
| } | ||
|
|
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| func (alerter *slackAlerter) Alert(header, body string) { | ||
| message := formatMessage(header, body) | ||
|
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| request, err := http.NewRequest("POST", alerter.url, strings.NewReader(message)) | ||
| if err != nil { | ||
| log.Error("Failed to send Slack alert", "err", err) | ||
| return | ||
| } | ||
|
|
||
| response, err := alerter.client.Do(request) | ||
| if err != nil { | ||
| log.Error("Failed to send HTTP request", "err", err) | ||
| return | ||
| } | ||
|
|
||
| if response.StatusCode >= 400 { | ||
| responseBody := make([]byte, reponseBuffer) | ||
| response.Body.Read(responseBody) | ||
| log.Error("Error response from server", "status", response.StatusCode, "body", responseBody) | ||
| return | ||
| } | ||
| } | ||
|
|
||
| func NewSlackAlert() *slackAlerter { | ||
| slackUrl := os.Getenv("SLACK_WEBHOOK_URL") | ||
| client := &http.Client{ | ||
| CheckRedirect: func(req *http.Request, via []*http.Request) error { | ||
| return errors.New("invalid redirect") | ||
| }, | ||
| } | ||
|
|
||
| return &slackAlerter{ | ||
| url: slackUrl, | ||
| client: client, | ||
| } | ||
| } |