pptx704
7753938044
Implements Phase 1: boot a Firecracker microVM, execute a command inside it via envd, and get the output back. Uses raw Firecracker HTTP API via Unix socket (not the Go SDK) for full control over the VM lifecycle. - internal/vm: VM manager with create/pause/resume/destroy, Firecracker HTTP client, process launcher with unshare + ip netns exec isolation - internal/network: per-sandbox network namespace with veth pair, TAP device, NAT rules, and IP forwarding - internal/envdclient: Connect RPC client for envd process/filesystem services with health check retry - cmd/host-agent: demo binary that boots a VM, runs "echo hello", prints output, and cleans up - proto/envd: canonical proto files with buf + protoc-gen-connect-go code generation - images/wrenn-init.sh: minimal PID 1 init script for guest VMs - CLAUDE.md: updated architecture to reflect TAP networking (not vsock) and Firecracker HTTP API (not Go SDK)
53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
package envdclient
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import (
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"context"
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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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// 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 && resp.StatusCode != http.StatusNoContent {
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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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