feat: gamemaster

2026-05-03 07:59:03 +02:00
parent a7cee15115
commit 3e2622757e
229 changed files with 41521 additions and 1098 deletions
@@ -0,0 +1,225 @@
+// Package rtmclient provides the trusted-internal Runtime Manager
+// REST client Game Master uses for synchronous lifecycle operations
+// against an already-running container. Two routes are mounted:
+//
+//   - POST /api/v1/internal/runtimes/{game_id}/stop
+//   - POST /api/v1/internal/runtimes/{game_id}/patch
+//
+// `Restart` is reserved per `gamemaster/PLAN.md` Stage 10 and is not
+// part of the v1 surface.
+package rtmclient
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
+
+	"galaxy/gamemaster/internal/ports"
+)
+
+const (
+	stopPathTemplate  = "/api/v1/internal/runtimes/%s/stop"
+	patchPathTemplate = "/api/v1/internal/runtimes/%s/patch"
+)
+
+// Config configures one HTTP-backed Runtime Manager internal client.
+type Config struct {
+	// BaseURL stores the absolute base URL of the Runtime Manager
+	// internal HTTP listener (e.g. `http://rtmanager:8096`).
+	BaseURL string
+
+	// RequestTimeout bounds one outbound stop/patch request.
+	RequestTimeout time.Duration
+}
+
+// Client speaks REST/JSON to the Runtime Manager internal API.
+type Client struct {
+	baseURL              string
+	requestTimeout       time.Duration
+	httpClient           *http.Client
+	closeIdleConnections func()
+}
+
+type stopRequestEnvelope struct {
+	Reason string `json:"reason"`
+}
+
+type patchRequestEnvelope struct {
+	ImageRef string `json:"image_ref"`
+}
+
+type errorEnvelope struct {
+	Error *errorBody `json:"error"`
+}
+
+type errorBody struct {
+	Code    string `json:"code"`
+	Message string `json:"message"`
+}
+
+// NewClient constructs an RTM internal client with otelhttp-wrapped
+// transport cloned from `http.DefaultTransport`. Call `Close` to
+// release idle connections at shutdown.
+func NewClient(cfg Config) (*Client, error) {
+	transport, ok := http.DefaultTransport.(*http.Transport)
+	if !ok {
+		return nil, errors.New("new rtm client: default transport is not *http.Transport")
+	}
+	cloned := transport.Clone()
+	return newClient(cfg, &http.Client{Transport: otelhttp.NewTransport(cloned)}, cloned.CloseIdleConnections)
+}
+
+func newClient(cfg Config, httpClient *http.Client, closeIdleConnections func()) (*Client, error) {
+	switch {
+	case strings.TrimSpace(cfg.BaseURL) == "":
+		return nil, errors.New("new rtm client: base url must not be empty")
+	case cfg.RequestTimeout <= 0:
+		return nil, errors.New("new rtm client: request timeout must be positive")
+	case httpClient == nil:
+		return nil, errors.New("new rtm client: http client must not be nil")
+	}
+	parsed, err := url.Parse(strings.TrimRight(strings.TrimSpace(cfg.BaseURL), "/"))
+	if err != nil {
+		return nil, fmt.Errorf("new rtm client: parse base url: %w", err)
+	}
+	if parsed.Scheme == "" || parsed.Host == "" {
+		return nil, errors.New("new rtm client: base url must be absolute")
+	}
+	return &Client{
+		baseURL:              parsed.String(),
+		requestTimeout:       cfg.RequestTimeout,
+		httpClient:           httpClient,
+		closeIdleConnections: closeIdleConnections,
+	}, nil
+}
+
+// Close releases idle HTTP connections owned by the underlying
+// transport. Safe to call multiple times.
+func (client *Client) Close() error {
+	if client == nil || client.closeIdleConnections == nil {
+		return nil
+	}
+	client.closeIdleConnections()
+	return nil
+}
+
+// Stop calls POST /api/v1/internal/runtimes/{game_id}/stop with body
+// `{reason}`. Any non-success outcome is wrapped with
+// `ports.ErrRTMUnavailable`.
+func (client *Client) Stop(ctx context.Context, gameID, reason string) error {
+	if err := client.validate(ctx, gameID); err != nil {
+		return err
+	}
+	if strings.TrimSpace(reason) == "" {
+		return errors.New("rtm stop: reason must not be empty")
+	}
+	body, err := json.Marshal(stopRequestEnvelope{Reason: reason})
+	if err != nil {
+		return fmt.Errorf("rtm stop: encode request: %w", err)
+	}
+	return client.callMutation(ctx, fmt.Sprintf(stopPathTemplate, url.PathEscape(gameID)), body, "rtm stop")
+}
+
+// Patch calls POST /api/v1/internal/runtimes/{game_id}/patch with body
+// `{image_ref}`. A `409 conflict` from RTM (semver violation) is also
+// wrapped with `ports.ErrRTMUnavailable`; the underlying `error_code`
+// is preserved in the wrapped error message so callers can branch on
+// the substring if needed.
+func (client *Client) Patch(ctx context.Context, gameID, imageRef string) error {
+	if err := client.validate(ctx, gameID); err != nil {
+		return err
+	}
+	if strings.TrimSpace(imageRef) == "" {
+		return errors.New("rtm patch: image ref must not be empty")
+	}
+	body, err := json.Marshal(patchRequestEnvelope{ImageRef: imageRef})
+	if err != nil {
+		return fmt.Errorf("rtm patch: encode request: %w", err)
+	}
+	return client.callMutation(ctx, fmt.Sprintf(patchPathTemplate, url.PathEscape(gameID)), body, "rtm patch")
+}
+
+func (client *Client) validate(ctx context.Context, gameID string) error {
+	if client == nil || client.httpClient == nil {
+		return errors.New("rtm client: nil client")
+	}
+	if ctx == nil {
+		return errors.New("rtm client: nil context")
+	}
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	if strings.TrimSpace(gameID) == "" {
+		return errors.New("rtm client: game id must not be empty")
+	}
+	return nil
+}
+
+func (client *Client) callMutation(ctx context.Context, requestPath string, body []byte, opLabel string) error {
+	payload, statusCode, err := client.doRequest(ctx, http.MethodPost, requestPath, body)
+	if err != nil {
+		return fmt.Errorf("%w: %s: %w", ports.ErrRTMUnavailable, opLabel, err)
+	}
+	if statusCode >= 200 && statusCode < 300 {
+		return nil
+	}
+	errorCode := decodeErrorCode(payload)
+	if errorCode != "" {
+		return fmt.Errorf("%w: %s: unexpected status %d (error_code=%s)", ports.ErrRTMUnavailable, opLabel, statusCode, errorCode)
+	}
+	return fmt.Errorf("%w: %s: unexpected status %d", ports.ErrRTMUnavailable, opLabel, statusCode)
+}
+
+func (client *Client) doRequest(ctx context.Context, method, requestPath string, body []byte) ([]byte, int, error) {
+	attemptCtx, cancel := context.WithTimeout(ctx, client.requestTimeout)
+	defer cancel()
+
+	var reader io.Reader
+	if len(body) > 0 {
+		reader = bytes.NewReader(body)
+	}
+	req, err := http.NewRequestWithContext(attemptCtx, method, client.baseURL+requestPath, reader)
+	if err != nil {
+		return nil, 0, fmt.Errorf("build request: %w", err)
+	}
+	req.Header.Set("Accept", "application/json")
+	if len(body) > 0 {
+		req.Header.Set("Content-Type", "application/json")
+	}
+	resp, err := client.httpClient.Do(req)
+	if err != nil {
+		return nil, 0, err
+	}
+	defer resp.Body.Close()
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, resp.StatusCode, fmt.Errorf("read response body: %w", err)
+	}
+	return respBody, resp.StatusCode, nil
+}
+
+func decodeErrorCode(payload []byte) string {
+	if len(payload) == 0 {
+		return ""
+	}
+	var envelope errorEnvelope
+	if err := json.Unmarshal(payload, &envelope); err != nil {
+		return ""
+	}
+	if envelope.Error == nil {
+		return ""
+	}
+	return envelope.Error.Code
+}
+
+// Compile-time assertion: Client implements ports.RTMClient.
+var _ ports.RTMClient = (*Client)(nil)