forked from wrenn/wrenn
81 lines
1.9 KiB
Go
81 lines
1.9 KiB
Go
package envdclient
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import (
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"context"
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"encoding/json"
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"fmt"
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"log/slog"
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"net/http"
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"time"
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)
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// WaitUntilReady polls envd's health endpoint until it responds successfully
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// or the context is cancelled. It retries every retryInterval.
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func (c *Client) WaitUntilReady(ctx context.Context) error {
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const retryInterval = 100 * time.Millisecond
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slog.Info("waiting for envd to be ready", "url", c.healthURL)
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ticker := time.NewTicker(retryInterval)
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defer ticker.Stop()
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for {
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select {
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case <-ctx.Done():
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return fmt.Errorf("envd not ready: %w", ctx.Err())
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case <-ticker.C:
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if err := c.healthCheck(ctx); err == nil {
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slog.Info("envd is ready", "host", c.hostIP)
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return nil
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}
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}
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}
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}
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// FetchVersion queries envd's health endpoint and returns the reported version.
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func (c *Client) FetchVersion(ctx context.Context) (string, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.healthURL, nil)
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if err != nil {
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return "", fmt.Errorf("build health request: %w", err)
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}
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return "", fmt.Errorf("fetch envd version: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return "", fmt.Errorf("health check returned %d", resp.StatusCode)
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}
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var data struct {
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Version string `json:"version"`
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}
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if err := json.NewDecoder(resp.Body).Decode(&data); err != nil {
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return "", fmt.Errorf("decode version response: %w", err)
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}
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return data.Version, nil
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}
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// healthCheck sends a single GET /health request to envd.
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func (c *Client) healthCheck(ctx context.Context) error {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.healthURL, nil)
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if err != nil {
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return err
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}
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return fmt.Errorf("health check returned %d", resp.StatusCode)
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}
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return nil
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}
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