feat(watchdog): add exception handling and webhook integration

- Implement exception handling in TCP client to process error messages
- Add webhook functionality to send notifications for exceptions
- Introduce utility functions for string parsing
- Update config with webhook template

webhook/webhook.go

@@ -0,0 +1,39 @@
+package webhook
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+
+	"super-frpc/postLog"
+)
+
+// SendHook sends a webhook to the specified URL.
+// Returns the error message, status code, and response message.
+// If the status code is not 200, it logs the error and returns the status code and response message.
+// If the status code is 200, it returns an empty error message, status code, and response message.
+func SendHook(url string, method string, headers map[string]string, body string) (err string, code int, msg string) {
+	req, reqErr := http.NewRequest(method, url, strings.NewReader(body))
+	if reqErr != nil {
+		return reqErr.Error(), 500, ""
+	}
+	for k, v := range headers {
+		req.Header.Set(k, v)
+	}
+	resp, doErr := http.DefaultClient.Do(req)
+	if doErr != nil {
+		return doErr.Error(), 500, ""
+	}
+	defer resp.Body.Close()
+	respMsg := ""
+	if resp.Body != nil {
+		respBody, _ := io.ReadAll(resp.Body)
+		respMsg = string(respBody)
+	}
+	if resp.StatusCode != http.StatusOK {
+		postLog.Debug(fmt.Sprintf("[SendHook] SendHook { %s, %s, %s, %s } failed, status code: %d, response: [%s]: %s", url, method, headers, body, resp.StatusCode, resp.Status, respMsg))
+		return fmt.Sprintf("unexpected status code: %d, response: [%s]: %s", resp.StatusCode, resp.Status, respMsg), resp.StatusCode, respMsg
+	}
+	return "", 200, ""
+}