v0.1.0 (#17)

internal/envdclient/health.go

@@ -2,7 +2,9 @@ package envdclient
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
+	"io"
 	"log/slog"
 	"net/http"
 	"time"
@@ -31,6 +33,38 @@ func (c *Client) WaitUntilReady(ctx context.Context) error {
 	}
 }
 
+// FetchVersion queries envd's health endpoint and returns the reported version.
+func (c *Client) FetchVersion(ctx context.Context) (string, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.healthURL, nil)
+	if err != nil {
+		return "", fmt.Errorf("build health request: %w", err)
+	}
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("fetch envd version: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusNoContent {
+		return "", fmt.Errorf("health check returned %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil || len(body) == 0 {
+		return "", nil // envd may not support version reporting yet
+	}
+
+	var data struct {
+		Version string `json:"version"`
+	}
+	if err := json.Unmarshal(body, &data); err != nil {
+		return "", nil // non-JSON response, old envd
+	}
+
+	return data.Version, nil
+}
+
 // healthCheck sends a single GET /health request to envd.
 func (c *Client) healthCheck(ctx context.Context) error {
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.healthURL, nil)