1 files changed, 86 insertions, 0 deletions
diff --git a/backend/internal/monitor/checker.go b/backend/internal/monitor/checker.go
new file mode 100644
index 0000000..07f807e
--- /dev/null
+++ b/backend/internal/monitor/checker.go
@@ -0,0 +1,86 @@
+package monitor
+
+import (
+	"context"
+	"io"
+	"net/http"
+	"strings"
+	"time"
+
+	"yaum/internal/model"
+)
+
+var httpClient = &http.Client{
+	Timeout: 10 * time.Second,
+}
+
+func CheckHTTP(ctx context.Context, url string, keyword string) model.Heartbeat {
+	start := time.Now()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return heartbeatFromError(start, err)
+	}
+
+	resp, err := httpClient.Do(req)
+	elapsed := time.Since(start).Milliseconds()
+
+	if err != nil {
+		return model.Heartbeat{
+			StatusCode:     0,
+			ResponseTimeMs: elapsed,
+			IsUp:           false,
+			ErrorMessage:   err.Error(),
+			TestedAt:       time.Now(),
+		}
+	}
+	defer resp.Body.Close()
+
+	isUp := resp.StatusCode >= 200 && resp.StatusCode < 400
+	errMsg := ""
+
+	body, readErr := io.ReadAll(resp.Body)
+	if readErr != nil {
+		isUp = false
+		errMsg = "Erro ao ler corpo: " + readErr.Error()
+	} else {
+		bodyStr := string(body)
+
+		if keyword != "" && isUp {
+			if !strings.Contains(bodyStr, keyword) {
+				isUp = false
+				errMsg = "Palavra-chave nao encontrada"
+			}
+		}
+
+		if !isUp {
+			snippet := strings.TrimSpace(bodyStr)
+			if len(snippet) > 300 {
+				snippet = snippet[:300]
+			}
+			if errMsg == "" {
+				errMsg = snippet
+			} else {
+				errMsg += " | " + snippet
+			}
+		}
+	}
+
+	return model.Heartbeat{
+		StatusCode:     resp.StatusCode,
+		ResponseTimeMs: elapsed,
+		IsUp:           isUp,
+		ErrorMessage:   errMsg,
+		TestedAt:       time.Now(),
+	}
+}
+
+func heartbeatFromError(start time.Time, err error) model.Heartbeat {
+	return model.Heartbeat{
+		StatusCode:     0,
+		ResponseTimeMs: time.Since(start).Milliseconds(),
+		IsUp:           false,
+		ErrorMessage:   err.Error(),
+		TestedAt:       time.Now(),
+	}
+}