style(alerting): Add comments and rename character bytes constant
@@ -66,6 +66,7 @@ func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert,
if config.ServerURL == "" {
config.ServerURL = defaultHomeserverURL
}
+ // The Matrix endpoint requires a unique transaction ID for each event sent
txnId := randStringBytes(24)
request, err := http.NewRequest(
http.MethodPut,
@@ -173,14 +174,16 @@ func (provider *AlertProvider) getConfigForGroup(group string) MatrixProviderCon
}
}
-const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
-
func randStringBytes(n int) string {
+ // All the compatible characters to use in a transaction ID
+ const availableCharacterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
b := make([]byte, n)
rand.Seed(time.Now().UnixNano())
for i := range b {
- b[i] = letterBytes[rand.Intn(len(letterBytes))]
+ b[i] = availableCharacterBytes[rand.Intn(len(availableCharacterBytes))]
}
+
return string(b)
}
