feat: gamemaster
This commit is contained in:
Ilia Denisov
@@ -0,0 +1,314 @@
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// Package reportget implements the per-player turn-report hot-path
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// service owned by Game Master. It accepts a verified `(game_id, user_id,
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// turn)` envelope from Edge Gateway, authorises the caller against the
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// membership cache, resolves `race_name` from `player_mappings`, and
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// forwards `GET /api/v1/report?player={race_name}&turn={turn}` to the
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// engine.
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//
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// Lifecycle and error semantics follow `gamemaster/README.md §Hot Path →
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// Reports`. Unlike commandexecute and orderput, the report service does
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// not require `runtime_records.status = running`: reports may be served
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// against any runtime that exists in the table, allowing post-finish
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// inspection. Design rationale (decision D1) is captured in
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// `gamemaster/docs/stage16-membership-cache-and-invalidation.md`.
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package reportget
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"log/slog"
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"strings"
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"time"
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"galaxy/gamemaster/internal/domain/operation"
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"galaxy/gamemaster/internal/domain/playermapping"
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"galaxy/gamemaster/internal/domain/runtime"
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"galaxy/gamemaster/internal/logging"
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"galaxy/gamemaster/internal/ports"
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"galaxy/gamemaster/internal/service/membership"
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"galaxy/gamemaster/internal/telemetry"
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)
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const (
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engineCallOp = "report"
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membershipStatusActive = "active"
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)
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// Input stores the per-call arguments for one report-get operation.
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type Input struct {
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// GameID identifies the platform game whose report is being read.
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GameID string
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// UserID identifies the platform user submitting the request. The
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// service derives `race_name` from this value via `player_mappings`
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// before calling the engine.
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UserID string
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// Turn identifies the turn number to read. Must be non-negative;
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// zero requests the initial state report.
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Turn int
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}
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// Validate reports whether input carries the structural invariants the
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// service requires before any store is touched.
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func (input Input) Validate() error {
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if strings.TrimSpace(input.GameID) == "" {
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return fmt.Errorf("game id must not be empty")
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}
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if strings.TrimSpace(input.UserID) == "" {
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return fmt.Errorf("user id must not be empty")
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}
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if input.Turn < 0 {
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return fmt.Errorf("turn must not be negative, got %d", input.Turn)
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}
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return nil
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}
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// Result stores the deterministic outcome of one Handle call.
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type Result struct {
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// Outcome reports whether the operation completed (success) or
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// produced a stable failure code.
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Outcome operation.Outcome
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// ErrorCode stores the stable error code on failure. Empty on
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// success.
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ErrorCode string
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// ErrorMessage stores the operator-readable detail on failure.
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// Empty on success.
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ErrorMessage string
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// RawResponse stores the engine response body. Populated on success
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// and on `engine_validation_error`. Empty on every other terminal
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// branch.
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RawResponse json.RawMessage
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}
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// IsSuccess reports whether the result represents a successful operation.
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func (result Result) IsSuccess() bool {
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return result.Outcome == operation.OutcomeSuccess
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}
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// Dependencies groups the collaborators required by Service.
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type Dependencies struct {
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// RuntimeRecords loads the engine endpoint.
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RuntimeRecords ports.RuntimeRecordStore
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// PlayerMappings resolves `(game_id, user_id) → race_name`.
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PlayerMappings ports.PlayerMappingStore
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// Membership authorises the caller.
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Membership *membership.Cache
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// Engine forwards `GET /api/v1/report` calls.
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Engine ports.EngineClient
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// Telemetry records the per-outcome counter and the engine-call
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// latency histogram.
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Telemetry *telemetry.Runtime
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// Logger records structured service-level events. Defaults to
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// `slog.Default()` when nil.
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Logger *slog.Logger
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// Clock supplies the wall-clock used for engine-call latency.
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// Defaults to `time.Now` when nil.
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Clock func() time.Time
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}
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// Service executes the report-get hot-path operation.
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type Service struct {
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runtimeRecords ports.RuntimeRecordStore
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playerMappings ports.PlayerMappingStore
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membership *membership.Cache
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engine ports.EngineClient
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telemetry *telemetry.Runtime
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logger *slog.Logger
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clock func() time.Time
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}
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// NewService constructs one Service from deps.
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func NewService(deps Dependencies) (*Service, error) {
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switch {
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case deps.RuntimeRecords == nil:
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return nil, errors.New("new report get service: nil runtime records")
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case deps.PlayerMappings == nil:
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return nil, errors.New("new report get service: nil player mappings")
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case deps.Membership == nil:
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return nil, errors.New("new report get service: nil membership cache")
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case deps.Engine == nil:
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return nil, errors.New("new report get service: nil engine client")
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case deps.Telemetry == nil:
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return nil, errors.New("new report get service: nil telemetry runtime")
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}
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clock := deps.Clock
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if clock == nil {
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clock = time.Now
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}
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logger := deps.Logger
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if logger == nil {
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logger = slog.Default()
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}
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logger = logger.With("service", "gamemaster.reportget")
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return &Service{
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runtimeRecords: deps.RuntimeRecords,
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playerMappings: deps.PlayerMappings,
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membership: deps.Membership,
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engine: deps.Engine,
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telemetry: deps.Telemetry,
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logger: logger,
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clock: clock,
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}, nil
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}
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// Handle executes one report-get operation end-to-end. The Go-level error
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// return is reserved for non-business failures (nil context, nil
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// receiver). Every business outcome flows through Result.
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func (service *Service) Handle(ctx context.Context, input Input) (Result, error) {
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if service == nil {
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return Result{}, errors.New("report get: nil service")
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}
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if ctx == nil {
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return Result{}, errors.New("report get: nil context")
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}
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if err := input.Validate(); err != nil {
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return service.recordFailure(ctx, input, ErrorCodeInvalidRequest, err.Error(), nil), nil
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}
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record, result, ok := service.loadRecord(ctx, input)
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if !ok {
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return result, nil
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}
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mapping, result, ok := service.authorise(ctx, input)
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if !ok {
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return result, nil
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}
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body, engineErr := service.callEngine(ctx, record.EngineEndpoint, mapping.RaceName, input.Turn)
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if engineErr != nil {
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errorCode := classifyEngineError(engineErr)
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message := fmt.Sprintf("engine report: %s", engineErr.Error())
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var bodyForCaller json.RawMessage
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if errorCode == ErrorCodeEngineValidationError {
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bodyForCaller = body
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}
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return service.recordFailure(ctx, input, errorCode, message, bodyForCaller), nil
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}
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service.telemetry.RecordReportGetOutcome(ctx,
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string(operation.OutcomeSuccess), "")
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logArgs := []any{
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"game_id", input.GameID,
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"user_id", input.UserID,
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"actor", mapping.RaceName,
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"turn", input.Turn,
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}
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logArgs = append(logArgs, logging.ContextAttrs(ctx)...)
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service.logger.InfoContext(ctx, "report get succeeded", logArgs...)
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return Result{
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Outcome: operation.OutcomeSuccess,
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RawResponse: body,
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}, nil
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}
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// loadRecord reads the runtime record and maps store errors to
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// orchestrator outcomes. ok=false means the flow stops with the returned
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// Result. Reports tolerate any non-deleted runtime status; the running
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// guard from commandexecute / orderput is intentionally absent.
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func (service *Service) loadRecord(ctx context.Context, input Input) (runtime.RuntimeRecord, Result, bool) {
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record, err := service.runtimeRecords.Get(ctx, input.GameID)
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switch {
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case err == nil:
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return record, Result{}, true
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case errors.Is(err, runtime.ErrNotFound):
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return runtime.RuntimeRecord{}, service.recordFailure(ctx, input,
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ErrorCodeRuntimeNotFound, "runtime record does not exist", nil), false
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default:
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return runtime.RuntimeRecord{}, service.recordFailure(ctx, input,
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ErrorCodeServiceUnavailable, fmt.Sprintf("get runtime record: %s", err.Error()), nil), false
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}
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}
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// authorise resolves the membership status and the player mapping for
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// the caller. ok=false means the flow stops with the returned Result.
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func (service *Service) authorise(ctx context.Context, input Input) (playermapping.PlayerMapping, Result, bool) {
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status, err := service.membership.Resolve(ctx, input.GameID, input.UserID)
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if err != nil {
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return playermapping.PlayerMapping{}, service.recordFailure(ctx, input,
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ErrorCodeServiceUnavailable, fmt.Sprintf("resolve membership: %s", err.Error()), nil), false
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}
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if status != membershipStatusActive {
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message := fmt.Sprintf("membership status %q does not authorise reports", status)
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if status == "" {
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message = "user is not a member of the game"
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}
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return playermapping.PlayerMapping{}, service.recordFailure(ctx, input,
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ErrorCodeForbidden, message, nil), false
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}
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mapping, err := service.playerMappings.Get(ctx, input.GameID, input.UserID)
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switch {
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case err == nil:
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return mapping, Result{}, true
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case errors.Is(err, playermapping.ErrNotFound):
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return playermapping.PlayerMapping{}, service.recordFailure(ctx, input,
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ErrorCodeForbidden, "player mapping not installed for active member", nil), false
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default:
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return playermapping.PlayerMapping{}, service.recordFailure(ctx, input,
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ErrorCodeServiceUnavailable, fmt.Sprintf("get player mapping: %s", err.Error()), nil), false
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}
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}
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// callEngine forwards the read to the engine and records the wall-clock
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// latency under the `report` op label.
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func (service *Service) callEngine(ctx context.Context, baseURL, raceName string, turn int) (json.RawMessage, error) {
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start := service.clock()
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body, err := service.engine.GetReport(ctx, baseURL, raceName, turn)
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service.telemetry.RecordEngineCall(ctx, engineCallOp, service.clock().Sub(start))
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return body, err
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}
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// classifyEngineError maps the engine port sentinels to the report-get
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// stable error codes.
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func classifyEngineError(err error) string {
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switch {
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case errors.Is(err, ports.ErrEngineValidation):
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return ErrorCodeEngineValidationError
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case errors.Is(err, ports.ErrEngineProtocolViolation):
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return ErrorCodeEngineProtocolViolation
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case errors.Is(err, ports.ErrEngineUnreachable):
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return ErrorCodeEngineUnreachable
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default:
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return ErrorCodeEngineUnreachable
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}
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}
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// recordFailure emits the service-level outcome counter and a structured
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// log entry, then returns the Result the caller surfaces.
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func (service *Service) recordFailure(ctx context.Context, input Input, errorCode, errorMessage string, rawResponse json.RawMessage) Result {
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service.telemetry.RecordReportGetOutcome(ctx,
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string(operation.OutcomeFailure), errorCode)
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logArgs := []any{
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"game_id", input.GameID,
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"user_id", input.UserID,
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"turn", input.Turn,
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"error_code", errorCode,
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"error_message", errorMessage,
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}
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logArgs = append(logArgs, logging.ContextAttrs(ctx)...)
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service.logger.WarnContext(ctx, "report get rejected", logArgs...)
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return Result{
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Outcome: operation.OutcomeFailure,
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ErrorCode: errorCode,
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ErrorMessage: errorMessage,
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RawResponse: rawResponse,
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}
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}
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