| 1 | // Command moveprobe is the moves rehearsal probe (moves spec §14.4): a small |
| 2 | // app shaped like a customer app, deployed by the rehearsal runbook so that a |
| 3 | // move can be shown to carry every kind of state an instance has. |
| 4 | // |
| 5 | // It holds state in each place an instance can: |
| 6 | // |
| 7 | // - the database: a background loop writes a row every 500 ms, a forked |
| 8 | // worker writes one every second, and timer fires write one each; |
| 9 | // - the files directory: instance.key, written at first boot and checked |
| 10 | // against the database at every boot; |
| 11 | // - the platform's instance key (CARLOS_INSTANCE_KEY), fingerprinted at |
| 12 | // first boot and checked at every boot; |
| 13 | // - its store binding (MOVEPROBE_*): an object written at boot and read |
| 14 | // back on every readiness check; |
| 15 | // - a sealed secret (MOVEPROBE_SECRET); |
| 16 | // - timers: once-timers armed through the instance control socket, and a |
| 17 | // declared schedule set by the operator with `carlos schedule set`. |
| 18 | // |
| 19 | // The exec backend starts it as `moveprobe --socket <path> --db <path>` |
| 20 | // (internal/activator/backend_exec.go, spawnChildFrom). The files directory |
| 21 | // is the database path without ".db" (the flat layout). "/" answers what |
| 22 | // "/ready" answers, because a move probes "/" when moves.ready_path is unset. |
| 23 | // |
| 24 | // MOVEPROBE_FAIL_READY_IN=<region>[,after-write], read at startup, makes the |
| 25 | // probe fail its readiness in the named region. With no suffix (before-write) |
| 26 | // it writes nothing at all: no database open, no file, no worker, no socket |
| 27 | // call. With ",after-write" it writes one background row, lets its worker |
| 28 | // write, and then fails readiness. A box with no CARLOS_REGION is region |
| 29 | // "home". |
| 30 | // |
| 31 | // The README beside this file has the build and deploy lines. |
| 32 | package main |
| 33 | |
| 34 | import ( |
| 35 | "bufio" |
| 36 | "bytes" |
| 37 | "context" |
| 38 | "crypto/rand" |
| 39 | "crypto/sha256" |
| 40 | "crypto/subtle" |
| 41 | "database/sql" |
| 42 | "encoding/hex" |
| 43 | "encoding/json" |
| 44 | "errors" |
| 45 | "flag" |
| 46 | "fmt" |
| 47 | "io" |
| 48 | "io/fs" |
| 49 | "net" |
| 50 | "net/http" |
| 51 | "net/url" |
| 52 | "os" |
| 53 | "os/exec" |
| 54 | "os/signal" |
| 55 | "path/filepath" |
| 56 | "strconv" |
| 57 | "strings" |
| 58 | "sync" |
| 59 | "syscall" |
| 60 | "time" |
| 61 | |
| 62 | "github.com/aws/aws-sdk-go-v2/aws" |
| 63 | "github.com/aws/aws-sdk-go-v2/service/s3" |
| 64 | |
| 65 | _ "modernc.org/sqlite" |
| 66 | ) |
| 67 | |
| 68 | const ( |
| 69 | bgEvery = 500 * time.Millisecond |
| 70 | workerEvery = time.Second |
| 71 | // workerGrace is how long the worker keeps writing after its parent has |
| 72 | // gone. Long enough to outlive the main through a cut's stop and stop |
| 73 | // evidence (seconds); short enough that an ordinary sleep, which stops |
| 74 | // only the main, does not leave it writing for ever. |
| 75 | workerGrace = 60 * time.Second |
| 76 | // workerStale is how long the main waits for the worker's next status |
| 77 | // line (one a second) before readiness fails. |
| 78 | workerStale = 3 * time.Second |
| 79 | storeWait = 10 * time.Second |
| 80 | // storeCacheFor is how long one readiness store check answers for: |
| 81 | // anonymous /ready traffic costs at most one check per window. |
| 82 | storeCacheFor = 5 * time.Second |
| 83 | |
| 84 | modeNormal = "normal" |
| 85 | modeBeforeWrite = "before-write" |
| 86 | modeAfterWrite = "after-write" |
| 87 | ) |
| 88 | |
| 89 | // workerGraceOverride, set at link time (-ldflags "-X |
| 90 | // main.workerGraceOverride=8s"), replaces workerGrace. Only the tests set |
| 91 | // it, to watch the worker leave after seconds rather than a minute; a build |
| 92 | // that does not set it keeps workerGrace. |
| 93 | var workerGraceOverride string |
| 94 | |
| 95 | // orphanGrace is workerGrace, or the link-time override when one is set. |
| 96 | func orphanGrace() time.Duration { |
| 97 | if d, err := time.ParseDuration(workerGraceOverride); err == nil && d > 0 { |
| 98 | return d |
| 99 | } |
| 100 | return workerGrace |
| 101 | } |
| 102 | |
| 103 | func main() { |
| 104 | if len(os.Args) > 1 && os.Args[1] == "worker" { |
| 105 | os.Exit(runWorker(os.Args[2:])) |
| 106 | } |
| 107 | os.Exit(run(os.Args[1:])) |
| 108 | } |
| 109 | |
| 110 | func logf(format string, args ...any) { |
| 111 | fmt.Fprintf(os.Stderr, "moveprobe: "+format+"\n", args...) |
| 112 | } |
| 113 | |
| 114 | // region is CARLOS_REGION, or "home" when the box has no placement code and |
| 115 | // the agent leaves the variable out. |
| 116 | func region() (name, from string) { |
| 117 | if r := strings.TrimSpace(os.Getenv("CARLOS_REGION")); r != "" { |
| 118 | return r, "CARLOS_REGION" |
| 119 | } |
| 120 | return "home", "unset, treated as home" |
| 121 | } |
| 122 | |
| 123 | // failMode reads MOVEPROBE_FAIL_READY_IN for this region. A suffix other |
| 124 | // than after-write is read as before-write, the mode that writes nothing. |
| 125 | func failMode(spec, here string) string { |
| 126 | spec = strings.TrimSpace(spec) |
| 127 | if spec == "" { |
| 128 | return modeNormal |
| 129 | } |
| 130 | where, suffix, hasSuffix := strings.Cut(spec, ",") |
| 131 | if strings.TrimSpace(where) != here { |
| 132 | return modeNormal |
| 133 | } |
| 134 | if hasSuffix && strings.TrimSpace(suffix) == modeAfterWrite { |
| 135 | return modeAfterWrite |
| 136 | } |
| 137 | if hasSuffix { |
| 138 | logf("MOVEPROBE_FAIL_READY_IN suffix %q is not after-write; using before-write", suffix) |
| 139 | } |
| 140 | return modeBeforeWrite |
| 141 | } |
| 142 | |
| 143 | func run(args []string) int { |
| 144 | fl := flag.NewFlagSet("moveprobe", flag.ContinueOnError) |
| 145 | sock := fl.String("socket", "", "unix socket to listen on") |
| 146 | dbPath := fl.String("db", "", "the instance database") |
| 147 | if err := fl.Parse(args); err != nil { |
| 148 | return 2 |
| 149 | } |
| 150 | if *sock == "" || *dbPath == "" { |
| 151 | logf("--socket and --db are required") |
| 152 | return 2 |
| 153 | } |
| 154 | ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM) |
| 155 | defer stop() |
| 156 | |
| 157 | here, from := region() |
| 158 | mode := failMode(os.Getenv("MOVEPROBE_FAIL_READY_IN"), here) |
| 159 | if mode == modeBeforeWrite { |
| 160 | logf("before-write mode in region %s: nothing is written", here) |
| 161 | return serve(ctx, *sock, http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) { |
| 162 | http.Error(w, "before-write mode: this box writes nothing", http.StatusServiceUnavailable) |
| 163 | })) |
| 164 | } |
| 165 | |
| 166 | a, err := boot(ctx, *dbPath, here, from, mode) |
| 167 | if err != nil { |
| 168 | logf("%v", err) |
| 169 | return 1 |
| 170 | } |
| 171 | defer a.db.Close() |
| 172 | |
| 173 | loopCtx, stopLoop := context.WithCancel(ctx) |
| 174 | defer stopLoop() |
| 175 | if mode == modeAfterWrite { |
| 176 | // The mode's whole promise is this row; without it the rollback |
| 177 | // would have nothing to find, so the app does not start. |
| 178 | if err := a.insertSeq("bg"); err != nil { |
| 179 | logf("after-write: the bg row did not commit: %v", err) |
| 180 | return 1 |
| 181 | } |
| 182 | } else { |
| 183 | go a.bgLoop(loopCtx) |
| 184 | } |
| 185 | a.forkWorker() |
| 186 | return serve(ctx, *sock, a.routes()) |
| 187 | } |
| 188 | |
| 189 | // serve listens on sock until ctx ends, then shuts down. |
| 190 | func serve(ctx context.Context, sock string, h http.Handler) int { |
| 191 | if fi, err := os.Lstat(sock); err == nil && fi.Mode()&fs.ModeSocket != 0 { |
| 192 | os.Remove(sock) |
| 193 | } |
| 194 | ln, err := net.Listen("unix", sock) |
| 195 | if err != nil { |
| 196 | logf("listen: %v", err) |
| 197 | return 1 |
| 198 | } |
| 199 | srv := &http.Server{Handler: h, ReadHeaderTimeout: 10 * time.Second} |
| 200 | errc := make(chan error, 1) |
| 201 | go func() { errc <- srv.Serve(ln) }() |
| 202 | select { |
| 203 | case err := <-errc: |
| 204 | logf("serve: %v", err) |
| 205 | return 1 |
| 206 | case <-ctx.Done(): |
| 207 | } |
| 208 | shutCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second) |
| 209 | defer cancel() |
| 210 | srv.Shutdown(shutCtx) |
| 211 | return 0 |
| 212 | } |
| 213 | |
| 214 | type app struct { |
| 215 | db *sql.DB |
| 216 | dbPath string |
| 217 | filesDir string |
| 218 | host string |
| 219 | region string |
| 220 | regionFrom string |
| 221 | mode string |
| 222 | bootID string |
| 223 | |
| 224 | fileKey string // meta instance_key; empty when the boot could not settle it |
| 225 | fileKeyErr error // set at boot when the file and the database disagree |
| 226 | platformFP string // SHA-256 of CARLOS_INSTANCE_KEY |
| 227 | platErr error |
| 228 | |
| 229 | store *s3.Client |
| 230 | storeErr error |
| 231 | bucket string |
| 232 | objKey string |
| 233 | objBody string |
| 234 | |
| 235 | // The readiness store check: one in flight at a time, its result kept |
| 236 | // for storeCacheFor. |
| 237 | storeMu sync.Mutex |
| 238 | storeRunning chan struct{} // closed when the running check finishes |
| 239 | storeAt time.Time // when the cached result was taken |
| 240 | storeResult error |
| 241 | |
| 242 | mu sync.Mutex |
| 243 | objPut bool |
| 244 | workerPID int |
| 245 | // The worker reports every write over a pipe: how many committed and |
| 246 | // how many failed since this start, how many of the latest failed in a |
| 247 | // row, and the last error. |
| 248 | workerCommitted int64 |
| 249 | workerFailed int64 |
| 250 | workerInARow int64 |
| 251 | workerLastErr string |
| 252 | workerLastAt time.Time // the latest status line |
| 253 | workerExit string // why the worker is gone; empty while it runs |
| 254 | |
| 255 | // control is the one client for the instance control socket, nil when |
| 256 | // the agent delivered none. |
| 257 | control *http.Client |
| 258 | } |
| 259 | |
| 260 | func openDB(path string) (*sql.DB, error) { |
| 261 | db, err := sql.Open("sqlite", "file:"+url.PathEscape(path)+"?_pragma=busy_timeout(5000)&_pragma=journal_mode(WAL)") |
| 262 | if err != nil { |
| 263 | return nil, err |
| 264 | } |
| 265 | db.SetMaxOpenConns(1) |
| 266 | return db, nil |
| 267 | } |
| 268 | |
| 269 | func boot(ctx context.Context, dbPath, here, from, mode string) (*app, error) { |
| 270 | id := make([]byte, 8) |
| 271 | if _, err := rand.Read(id); err != nil { |
| 272 | return nil, err |
| 273 | } |
| 274 | a := &app{ |
| 275 | dbPath: dbPath, |
| 276 | filesDir: strings.TrimSuffix(dbPath, ".db"), |
| 277 | host: os.Getenv("CARLOS_HOST"), |
| 278 | region: here, |
| 279 | regionFrom: from, |
| 280 | mode: mode, |
| 281 | bootID: hex.EncodeToString(id), |
| 282 | } |
| 283 | db, err := openDB(dbPath) |
| 284 | if err != nil { |
| 285 | return nil, fmt.Errorf("open %s: %w", dbPath, err) |
| 286 | } |
| 287 | a.db = db |
| 288 | for _, q := range []string{ |
| 289 | `CREATE TABLE IF NOT EXISTS meta (key TEXT PRIMARY KEY, value TEXT NOT NULL)`, |
| 290 | `CREATE TABLE IF NOT EXISTS rows ( |
| 291 | id INTEGER PRIMARY KEY AUTOINCREMENT, |
| 292 | kind TEXT NOT NULL, |
| 293 | name TEXT NOT NULL DEFAULT '', |
| 294 | seq INTEGER NOT NULL DEFAULT 0, |
| 295 | due_at INTEGER NOT NULL DEFAULT 0, |
| 296 | fired_at INTEGER NOT NULL, |
| 297 | region TEXT NOT NULL)`, |
| 298 | `CREATE INDEX IF NOT EXISTS rows_kind_seq ON rows (kind, seq)`, |
| 299 | } { |
| 300 | if _, err := db.Exec(q); err != nil { |
| 301 | db.Close() |
| 302 | return nil, fmt.Errorf("schema: %w", err) |
| 303 | } |
| 304 | } |
| 305 | if err := os.MkdirAll(a.filesDir, 0o700); err != nil { |
| 306 | db.Close() |
| 307 | return nil, fmt.Errorf("files directory: %w", err) |
| 308 | } |
| 309 | if err := a.settleFileKey(); err != nil { |
| 310 | db.Close() |
| 311 | return nil, err |
| 312 | } |
| 313 | if err := a.settlePlatformKey(); err != nil { |
| 314 | db.Close() |
| 315 | return nil, err |
| 316 | } |
| 317 | a.setupStore() |
| 318 | if sock := os.Getenv("CARLOS_CONTROL_SOCKET"); sock != "" { |
| 319 | a.control = &http.Client{Timeout: 10 * time.Second, Transport: &http.Transport{ |
| 320 | DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) { |
| 321 | var d net.Dialer |
| 322 | return d.DialContext(ctx, "unix", sock) |
| 323 | }, |
| 324 | }} |
| 325 | } |
| 326 | if a.storeErr == nil { |
| 327 | putCtx, cancel := context.WithTimeout(ctx, storeWait) |
| 328 | if err := a.putObject(putCtx); err != nil { |
| 329 | logf("store: %v", err) |
| 330 | } |
| 331 | cancel() |
| 332 | } |
| 333 | return a, nil |
| 334 | } |
| 335 | |
| 336 | func (a *app) meta(key string) (string, bool, error) { |
| 337 | var v string |
| 338 | err := a.db.QueryRow(`SELECT value FROM meta WHERE key = ?`, key).Scan(&v) |
| 339 | if errors.Is(err, sql.ErrNoRows) { |
| 340 | return "", false, nil |
| 341 | } |
| 342 | return v, err == nil, err |
| 343 | } |
| 344 | |
| 345 | func (a *app) keyPath() string { return filepath.Join(a.filesDir, "instance.key") } |
| 346 | |
| 347 | // settleFileKey writes instance.key at first boot and records it in meta; |
| 348 | // on a later boot it remembers meta's value for the readiness check. A file |
| 349 | // with no database key is a mismatch, never a reason to adopt the file. |
| 350 | func (a *app) settleFileKey() error { |
| 351 | v, found, err := a.meta("instance_key") |
| 352 | if err != nil { |
| 353 | return fmt.Errorf("meta: %w", err) |
| 354 | } |
| 355 | if found { |
| 356 | a.fileKey = v |
| 357 | return nil |
| 358 | } |
| 359 | if _, err := os.Lstat(a.keyPath()); err == nil { |
| 360 | a.fileKeyErr = errors.New("key mismatch: instance.key exists but the database has no key") |
| 361 | return nil |
| 362 | } |
| 363 | raw := make([]byte, 32) |
| 364 | if _, err := rand.Read(raw); err != nil { |
| 365 | return err |
| 366 | } |
| 367 | key := hex.EncodeToString(raw) |
| 368 | f, err := os.OpenFile(a.keyPath(), os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0o600) |
| 369 | if err != nil { |
| 370 | return fmt.Errorf("instance.key: %w", err) |
| 371 | } |
| 372 | if _, err := f.WriteString(key + "\n"); err != nil { |
| 373 | f.Close() |
| 374 | return fmt.Errorf("instance.key: %w", err) |
| 375 | } |
| 376 | if err := f.Sync(); err != nil { |
| 377 | f.Close() |
| 378 | return fmt.Errorf("instance.key: %w", err) |
| 379 | } |
| 380 | if err := f.Close(); err != nil { |
| 381 | return fmt.Errorf("instance.key: %w", err) |
| 382 | } |
| 383 | if _, err := a.db.Exec(`INSERT INTO meta (key, value) VALUES ('instance_key', ?)`, key); err != nil { |
| 384 | return fmt.Errorf("meta: %w", err) |
| 385 | } |
| 386 | a.fileKey = key |
| 387 | return nil |
| 388 | } |
| 389 | |
| 390 | // settlePlatformKey records CARLOS_INSTANCE_KEY's fingerprint the first time |
| 391 | // it is seen and holds every later boot to it. |
| 392 | func (a *app) settlePlatformKey() error { |
| 393 | k := os.Getenv("CARLOS_INSTANCE_KEY") |
| 394 | if k == "" { |
| 395 | a.platErr = errors.New("CARLOS_INSTANCE_KEY is not set") |
| 396 | return nil |
| 397 | } |
| 398 | a.platformFP = fingerprint(k) |
| 399 | v, found, err := a.meta("platform_key_sha256") |
| 400 | if err != nil { |
| 401 | return fmt.Errorf("meta: %w", err) |
| 402 | } |
| 403 | if !found { |
| 404 | if _, err := a.db.Exec(`INSERT INTO meta (key, value) VALUES ('platform_key_sha256', ?)`, a.platformFP); err != nil { |
| 405 | return fmt.Errorf("meta: %w", err) |
| 406 | } |
| 407 | return nil |
| 408 | } |
| 409 | if v != a.platformFP { |
| 410 | a.platErr = errors.New("CARLOS_INSTANCE_KEY differs from the one seen at first boot") |
| 411 | } |
| 412 | return nil |
| 413 | } |
| 414 | |
| 415 | func fingerprint(s string) string { |
| 416 | sum := sha256.Sum256([]byte(s)) |
| 417 | return hex.EncodeToString(sum[:]) |
| 418 | } |
| 419 | |
| 420 | // fileKeyNow is instance.key as it is on disk now, trimmed. |
| 421 | func (a *app) fileKeyNow() (string, error) { |
| 422 | b, err := os.ReadFile(a.keyPath()) |
| 423 | if err != nil { |
| 424 | return "", err |
| 425 | } |
| 426 | return strings.TrimSpace(string(b)), nil |
| 427 | } |
| 428 | |
| 429 | func (a *app) checkFileKey() error { |
| 430 | if a.fileKeyErr != nil { |
| 431 | return a.fileKeyErr |
| 432 | } |
| 433 | got, err := a.fileKeyNow() |
| 434 | switch { |
| 435 | case errors.Is(err, fs.ErrNotExist): |
| 436 | return errors.New("key mismatch: instance.key is missing") |
| 437 | case err != nil: |
| 438 | return fmt.Errorf("key mismatch: instance.key: %v", err) |
| 439 | case subtle.ConstantTimeCompare([]byte(got), []byte(a.fileKey)) != 1: |
| 440 | return errors.New("key mismatch: instance.key differs from the database") |
| 441 | } |
| 442 | return nil |
| 443 | } |
| 444 | |
| 445 | // ---- the store ---------------------------------------------------------------- |
| 446 | |
| 447 | type storeConfig struct { |
| 448 | bucket, region, endpoint, accessKey, secretKey string |
| 449 | } |
| 450 | |
| 451 | // storeFromEnv reads the MOVEPROBE binding. The endpoint is optional: the |
| 452 | // platform delivers it only when the deployment has one, and never on AWS. |
| 453 | func storeFromEnv() (storeConfig, error) { |
| 454 | c := storeConfig{ |
| 455 | bucket: os.Getenv("MOVEPROBE_BUCKET"), |
| 456 | region: os.Getenv("MOVEPROBE_REGION"), |
| 457 | endpoint: os.Getenv("MOVEPROBE_ENDPOINT"), |
| 458 | accessKey: os.Getenv("MOVEPROBE_ACCESS_KEY"), |
| 459 | secretKey: os.Getenv("MOVEPROBE_SECRET_KEY"), |
| 460 | } |
| 461 | var missing []string |
| 462 | for _, v := range []struct{ name, val string }{ |
| 463 | {"MOVEPROBE_BUCKET", c.bucket}, |
| 464 | {"MOVEPROBE_REGION", c.region}, |
| 465 | {"MOVEPROBE_ACCESS_KEY", c.accessKey}, |
| 466 | {"MOVEPROBE_SECRET_KEY", c.secretKey}, |
| 467 | } { |
| 468 | if v.val == "" { |
| 469 | missing = append(missing, v.name) |
| 470 | } |
| 471 | } |
| 472 | if len(missing) > 0 { |
| 473 | return c, fmt.Errorf("store: %s not set", strings.Join(missing, ", ")) |
| 474 | } |
| 475 | return c, nil |
| 476 | } |
| 477 | |
| 478 | // newStoreClient builds the S3 client from the binding's keys alone. It |
| 479 | // never loads the default credential chain: the app shares the agent's uid |
| 480 | // on a flat box, so the chain could find the box's own role and read the |
| 481 | // object back without the binding. Path-style only with an endpoint, as |
| 482 | // objstore.S3ClientFor does. |
| 483 | func newStoreClient(c storeConfig) *s3.Client { |
| 484 | return s3.New(s3.Options{ |
| 485 | Region: c.region, |
| 486 | Credentials: aws.CredentialsProviderFunc(func(context.Context) (aws.Credentials, error) { |
| 487 | return aws.Credentials{AccessKeyID: c.accessKey, SecretAccessKey: c.secretKey, Source: "MOVEPROBE"}, nil |
| 488 | }), |
| 489 | BaseEndpoint: func() *string { |
| 490 | if c.endpoint == "" { |
| 491 | return nil |
| 492 | } |
| 493 | return aws.String(c.endpoint) |
| 494 | }(), |
| 495 | UsePathStyle: c.endpoint != "", |
| 496 | RequestChecksumCalculation: aws.RequestChecksumCalculationWhenRequired, |
| 497 | ResponseChecksumValidation: aws.ResponseChecksumValidationWhenRequired, |
| 498 | }) |
| 499 | } |
| 500 | |
| 501 | func (a *app) setupStore() { |
| 502 | c, err := storeFromEnv() |
| 503 | if err != nil { |
| 504 | a.storeErr = err |
| 505 | return |
| 506 | } |
| 507 | a.store = newStoreClient(c) |
| 508 | a.bucket = c.bucket |
| 509 | a.objKey = "probe/" + a.bootID + ".txt" |
| 510 | a.objBody = fmt.Sprintf("moveprobe boot %s host %s region %s at %s\n", a.bootID, a.host, a.region, time.Now().UTC().Format(time.RFC3339)) |
| 511 | } |
| 512 | |
| 513 | func (a *app) putObject(ctx context.Context) error { |
| 514 | _, err := a.store.PutObject(ctx, &s3.PutObjectInput{ |
| 515 | Bucket: aws.String(a.bucket), |
| 516 | Key: aws.String(a.objKey), |
| 517 | Body: bytes.NewReader([]byte(a.objBody)), |
| 518 | }) |
| 519 | if err != nil { |
| 520 | return fmt.Errorf("put %s: %w", a.objKey, err) |
| 521 | } |
| 522 | a.mu.Lock() |
| 523 | a.objPut = true |
| 524 | a.mu.Unlock() |
| 525 | return nil |
| 526 | } |
| 527 | |
| 528 | func (a *app) getObject(ctx context.Context) (string, error) { |
| 529 | out, err := a.store.GetObject(ctx, &s3.GetObjectInput{Bucket: aws.String(a.bucket), Key: aws.String(a.objKey)}) |
| 530 | if err != nil { |
| 531 | return "", fmt.Errorf("get %s: %w", a.objKey, err) |
| 532 | } |
| 533 | defer out.Body.Close() |
| 534 | b, err := io.ReadAll(io.LimitReader(out.Body, 1<<16)) |
| 535 | if err != nil { |
| 536 | return "", fmt.Errorf("get %s: %w", a.objKey, err) |
| 537 | } |
| 538 | return string(b), nil |
| 539 | } |
| 540 | |
| 541 | // checkStore puts the boot's object if the boot could not, then reads it |
| 542 | // back. |
| 543 | func (a *app) checkStore(ctx context.Context) error { |
| 544 | if a.storeErr != nil { |
| 545 | return a.storeErr |
| 546 | } |
| 547 | ctx, cancel := context.WithTimeout(ctx, storeWait) |
| 548 | defer cancel() |
| 549 | a.mu.Lock() |
| 550 | put := a.objPut |
| 551 | a.mu.Unlock() |
| 552 | if !put { |
| 553 | if err := a.putObject(ctx); err != nil { |
| 554 | return fmt.Errorf("store: %v", err) |
| 555 | } |
| 556 | } |
| 557 | got, err := a.getObject(ctx) |
| 558 | if err != nil { |
| 559 | return fmt.Errorf("store: %v", err) |
| 560 | } |
| 561 | if got != a.objBody { |
| 562 | return fmt.Errorf("store: %s reads back different bytes", a.objKey) |
| 563 | } |
| 564 | return nil |
| 565 | } |
| 566 | |
| 567 | // storeVerdict is checkStore for readiness, coalesced: a result younger than |
| 568 | // storeCacheFor is reused, and a request that arrives while a check runs |
| 569 | // waits for that check instead of starting another. The check itself runs |
| 570 | // on its own deadline, so one caller giving up does not cut it short for the |
| 571 | // others. |
| 572 | func (a *app) storeVerdict(ctx context.Context) error { |
| 573 | a.storeMu.Lock() |
| 574 | if !a.storeAt.IsZero() && time.Since(a.storeAt) < storeCacheFor { |
| 575 | err := a.storeResult |
| 576 | a.storeMu.Unlock() |
| 577 | return err |
| 578 | } |
| 579 | if running := a.storeRunning; running != nil { |
| 580 | a.storeMu.Unlock() |
| 581 | select { |
| 582 | case <-running: |
| 583 | case <-ctx.Done(): |
| 584 | return fmt.Errorf("store: %v", ctx.Err()) |
| 585 | } |
| 586 | a.storeMu.Lock() |
| 587 | err := a.storeResult |
| 588 | a.storeMu.Unlock() |
| 589 | return err |
| 590 | } |
| 591 | done := make(chan struct{}) |
| 592 | a.storeRunning = done |
| 593 | a.storeMu.Unlock() |
| 594 | |
| 595 | err := a.checkStore(context.Background()) |
| 596 | |
| 597 | a.storeMu.Lock() |
| 598 | a.storeResult, a.storeAt, a.storeRunning = err, time.Now(), nil |
| 599 | a.storeMu.Unlock() |
| 600 | close(done) |
| 601 | return err |
| 602 | } |
| 603 | |
| 604 | // ---- rows --------------------------------------------------------------------- |
| 605 | |
| 606 | // insertSeq writes the next row of a sequenced kind. The sequence is taken |
| 607 | // inside the insert, so two writers (a main and a worker from an earlier |
| 608 | // boot, or two generations) never take the same number. |
| 609 | func (a *app) insertSeq(kind string) error { |
| 610 | return insertSeq(a.db, kind, a.region) |
| 611 | } |
| 612 | |
| 613 | func insertSeq(db *sql.DB, kind, region string) error { |
| 614 | _, err := db.Exec(`INSERT INTO rows (kind, seq, fired_at, region) |
| 615 | SELECT ?, coalesce(max(seq), 0) + 1, ?, ? FROM rows WHERE kind = ?`, |
| 616 | kind, time.Now().Unix(), region, kind) |
| 617 | return err |
| 618 | } |
| 619 | |
| 620 | func (a *app) bgLoop(ctx context.Context) { |
| 621 | t := time.NewTicker(bgEvery) |
| 622 | defer t.Stop() |
| 623 | for { |
| 624 | if err := a.insertSeq("bg"); err != nil { |
| 625 | logf("bg: %v", err) |
| 626 | } |
| 627 | select { |
| 628 | case <-ctx.Done(): |
| 629 | return |
| 630 | case <-t.C: |
| 631 | } |
| 632 | } |
| 633 | } |
| 634 | |
| 635 | // ---- the worker --------------------------------------------------------------- |
| 636 | |
| 637 | // forkWorker starts the worker in its own session, with its stdio on |
| 638 | // /dev/null, so it neither shares the main's signals nor holds the pipes the |
| 639 | // backend reads the main's output from. A pipe of the main's own (the |
| 640 | // worker's fd 3) carries the outcome of each of the worker's writes. |
| 641 | func (a *app) forkWorker() { |
| 642 | status, statusW, err := os.Pipe() |
| 643 | if err != nil { |
| 644 | logf("worker: %v", err) |
| 645 | return |
| 646 | } |
| 647 | cmd := exec.Command(os.Args[0], "worker", "--db", a.dbPath, "--parent", strconv.Itoa(os.Getpid()), "--status-fd", "3") |
| 648 | cmd.SysProcAttr = detachAttr() |
| 649 | cmd.ExtraFiles = []*os.File{statusW} |
| 650 | err = cmd.Start() |
| 651 | statusW.Close() |
| 652 | if err != nil { |
| 653 | status.Close() |
| 654 | logf("worker: %v", err) |
| 655 | a.mu.Lock() |
| 656 | a.workerExit = "did not start: " + err.Error() |
| 657 | a.mu.Unlock() |
| 658 | return |
| 659 | } |
| 660 | a.mu.Lock() |
| 661 | a.workerPID = cmd.Process.Pid |
| 662 | a.mu.Unlock() |
| 663 | go func() { |
| 664 | err := cmd.Wait() |
| 665 | how := "exit status 0" |
| 666 | if err != nil { |
| 667 | how = err.Error() |
| 668 | } |
| 669 | a.mu.Lock() |
| 670 | a.workerExit = "exited (" + how + ")" |
| 671 | a.mu.Unlock() |
| 672 | }() |
| 673 | go a.readWorkerStatus(status) |
| 674 | } |
| 675 | |
| 676 | // readWorkerStatus reads the worker's lines: "ok", or "fail <error>". |
| 677 | func (a *app) readWorkerStatus(r *os.File) { |
| 678 | defer r.Close() |
| 679 | sc := bufio.NewScanner(r) |
| 680 | for sc.Scan() { |
| 681 | line := sc.Text() |
| 682 | a.mu.Lock() |
| 683 | a.workerLastAt = time.Now() |
| 684 | if msg, failed := strings.CutPrefix(line, "fail "); failed { |
| 685 | a.workerFailed++ |
| 686 | a.workerInARow++ |
| 687 | a.workerLastErr = msg |
| 688 | } else { |
| 689 | a.workerCommitted++ |
| 690 | a.workerInARow = 0 |
| 691 | } |
| 692 | a.mu.Unlock() |
| 693 | } |
| 694 | // The pipe closes when the worker exits; Wait's own account, when it |
| 695 | // comes, replaces this one. |
| 696 | a.mu.Lock() |
| 697 | if a.workerExit == "" { |
| 698 | a.workerExit = "exited (its status pipe closed)" |
| 699 | } |
| 700 | a.mu.Unlock() |
| 701 | } |
| 702 | |
| 703 | // checkWorker holds readiness to the worker: it is still running and has |
| 704 | // sent a status line within workerStale, at least one of its rows has |
| 705 | // committed since this start, and its latest write succeeded. |
| 706 | func (a *app) checkWorker() error { |
| 707 | a.mu.Lock() |
| 708 | defer a.mu.Unlock() |
| 709 | switch { |
| 710 | case a.workerExit != "": |
| 711 | return errors.New("worker: " + a.workerExit) |
| 712 | case !a.workerLastAt.IsZero() && time.Since(a.workerLastAt) > workerStale: |
| 713 | return fmt.Errorf("worker: no status for %ds", int(time.Since(a.workerLastAt).Seconds())) |
| 714 | case a.workerCommitted == 0 && a.workerInARow > 0: |
| 715 | return fmt.Errorf("worker: no row committed since start; last error: %s", a.workerLastErr) |
| 716 | case a.workerCommitted == 0: |
| 717 | return errors.New("worker: no row committed since start") |
| 718 | case a.workerInARow > 0: |
| 719 | return fmt.Errorf("worker: the last write failed: %s", a.workerLastErr) |
| 720 | } |
| 721 | return nil |
| 722 | } |
| 723 | |
| 724 | // runWorker writes a worker row every second. Once its parent has gone it |
| 725 | // keeps writing for workerGrace (orphanGrace) and then exits. |
| 726 | func runWorker(args []string) int { |
| 727 | fl := flag.NewFlagSet("moveprobe worker", flag.ContinueOnError) |
| 728 | dbPath := fl.String("db", "", "the instance database") |
| 729 | parent := fl.Int("parent", 0, "the main's pid") |
| 730 | statusFD := fl.Int("status-fd", 0, "a pipe to report each write on (0: none)") |
| 731 | if err := fl.Parse(args); err != nil || *dbPath == "" || *parent <= 0 { |
| 732 | return 2 |
| 733 | } |
| 734 | here, _ := region() |
| 735 | // Writes to the pipe fail once the main has gone; they are ignored. |
| 736 | report := func(err error) {} |
| 737 | if *statusFD > 0 { |
| 738 | status := os.NewFile(uintptr(*statusFD), "status") |
| 739 | defer status.Close() |
| 740 | report = func(err error) { |
| 741 | if err != nil { |
| 742 | fmt.Fprintf(status, "fail %s\n", strings.ReplaceAll(err.Error(), "\n", " ")) |
| 743 | } else { |
| 744 | fmt.Fprintln(status, "ok") |
| 745 | } |
| 746 | } |
| 747 | } |
| 748 | db, err := openDB(*dbPath) |
| 749 | if err != nil { |
| 750 | report(err) |
| 751 | return 1 |
| 752 | } |
| 753 | defer db.Close() |
| 754 | grace := orphanGrace() |
| 755 | var orphaned time.Time |
| 756 | t := time.NewTicker(workerEvery) |
| 757 | defer t.Stop() |
| 758 | for { |
| 759 | if orphaned.IsZero() && os.Getppid() != *parent { |
| 760 | orphaned = time.Now() |
| 761 | } |
| 762 | if !orphaned.IsZero() && time.Since(orphaned) >= grace { |
| 763 | return 0 |
| 764 | } |
| 765 | report(insertSeq(db, "worker", here)) |
| 766 | <-t.C |
| 767 | } |
| 768 | } |
| 769 | |
| 770 | // ---- HTTP --------------------------------------------------------------------- |
| 771 | |
| 772 | func (a *app) routes() http.Handler { |
| 773 | mux := http.NewServeMux() |
| 774 | mux.HandleFunc("/{$}", a.handleReady) |
| 775 | mux.HandleFunc("/ready", a.handleReady) |
| 776 | mux.HandleFunc("GET /report", a.bearer(os.Getenv("MOVEPROBE_SECRET"), a.handleReport)) |
| 777 | mux.HandleFunc("POST /arm-once", a.bearer(os.Getenv("MOVEPROBE_SECRET"), a.handleArmOnce)) |
| 778 | // The platform's runner signs each fire with the instance's admin token. |
| 779 | mux.HandleFunc("POST /tick", a.bearer(os.Getenv("CARLOS_ADMIN_TOKEN"), a.fired("tick"))) |
| 780 | mux.HandleFunc("POST /once", a.bearer(os.Getenv("CARLOS_ADMIN_TOKEN"), a.fired("once"))) |
| 781 | return mux |
| 782 | } |
| 783 | |
| 784 | // bearer admits a request carrying "Authorization: Bearer <want>". An empty |
| 785 | // want admits nothing. |
| 786 | func (a *app) bearer(want string, next http.HandlerFunc) http.HandlerFunc { |
| 787 | return func(w http.ResponseWriter, r *http.Request) { |
| 788 | got := sha256.Sum256([]byte(r.Header.Get("Authorization"))) |
| 789 | exp := sha256.Sum256([]byte("Bearer " + want)) |
| 790 | if want == "" || subtle.ConstantTimeCompare(got[:], exp[:]) != 1 { |
| 791 | http.Error(w, "unauthorized", http.StatusUnauthorized) |
| 792 | return |
| 793 | } |
| 794 | next(w, r) |
| 795 | } |
| 796 | } |
| 797 | |
| 798 | // readiness is /ready's answer: every check that fails, or ready. |
| 799 | func (a *app) readiness(ctx context.Context) (int, string) { |
| 800 | if a.mode == modeAfterWrite { |
| 801 | return http.StatusServiceUnavailable, "after-write mode: not ready here" |
| 802 | } |
| 803 | var fails []string |
| 804 | if err := a.checkFileKey(); err != nil { |
| 805 | fails = append(fails, err.Error()) |
| 806 | } |
| 807 | if a.platErr != nil { |
| 808 | fails = append(fails, a.platErr.Error()) |
| 809 | } |
| 810 | if os.Getenv("MOVEPROBE_SECRET") == "" { |
| 811 | fails = append(fails, "MOVEPROBE_SECRET is not set") |
| 812 | } |
| 813 | if err := a.storeVerdict(ctx); err != nil { |
| 814 | fails = append(fails, err.Error()) |
| 815 | } |
| 816 | if err := a.checkWorker(); err != nil { |
| 817 | fails = append(fails, err.Error()) |
| 818 | } |
| 819 | if len(fails) > 0 { |
| 820 | return http.StatusInternalServerError, strings.Join(fails, "; ") |
| 821 | } |
| 822 | return http.StatusOK, "ready" |
| 823 | } |
| 824 | |
| 825 | func (a *app) handleReady(w http.ResponseWriter, r *http.Request) { |
| 826 | code, msg := a.readiness(r.Context()) |
| 827 | if code != http.StatusOK { |
| 828 | http.Error(w, msg, code) |
| 829 | return |
| 830 | } |
| 831 | fmt.Fprintln(w, msg) |
| 832 | } |
| 833 | |
| 834 | func (a *app) fired(kind string) http.HandlerFunc { |
| 835 | return func(w http.ResponseWriter, r *http.Request) { |
| 836 | name := r.Header.Get("X-Carlos-Schedule") |
| 837 | due, err := strconv.ParseInt(r.Header.Get("X-Carlos-Schedule-At"), 10, 64) |
| 838 | if name == "" || err != nil { |
| 839 | http.Error(w, "want X-Carlos-Schedule and X-Carlos-Schedule-At", http.StatusBadRequest) |
| 840 | return |
| 841 | } |
| 842 | if _, err := a.db.Exec(`INSERT INTO rows (kind, name, due_at, fired_at, region) VALUES (?, ?, ?, ?, ?)`, |
| 843 | kind, name, due, time.Now().Unix(), a.region); err != nil { |
| 844 | http.Error(w, "database: "+err.Error(), http.StatusInternalServerError) |
| 845 | return |
| 846 | } |
| 847 | fmt.Fprintln(w, "ok") |
| 848 | } |
| 849 | } |
| 850 | |
| 851 | // handleArmOnce registers once-<n> for /once, due in the given seconds, |
| 852 | // through the instance control socket. |
| 853 | func (a *app) handleArmOnce(w http.ResponseWriter, r *http.Request) { |
| 854 | in, err := strconv.ParseInt(r.URL.Query().Get("in"), 10, 64) |
| 855 | if err != nil || in < 0 || in > 400*24*3600 { |
| 856 | http.Error(w, "in: want whole seconds, at most 400 days", http.StatusBadRequest) |
| 857 | return |
| 858 | } |
| 859 | if a.control == nil { |
| 860 | http.Error(w, "no control socket: CARLOS_CONTROL_SOCKET is not set", http.StatusServiceUnavailable) |
| 861 | return |
| 862 | } |
| 863 | token := os.Getenv("CARLOS_ADMIN_TOKEN") |
| 864 | if token == "" { |
| 865 | http.Error(w, "CARLOS_ADMIN_TOKEN is not set", http.StatusServiceUnavailable) |
| 866 | return |
| 867 | } |
| 868 | var n int64 |
| 869 | if err := a.db.QueryRow(`INSERT INTO meta (key, value) VALUES ('once_seq', '1') |
| 870 | ON CONFLICT (key) DO UPDATE SET value = CAST(value AS INTEGER) + 1 |
| 871 | RETURNING CAST(value AS INTEGER)`).Scan(&n); err != nil { |
| 872 | http.Error(w, "database: "+err.Error(), http.StatusInternalServerError) |
| 873 | return |
| 874 | } |
| 875 | name := fmt.Sprintf("once-%d", n) |
| 876 | at := time.Now().Add(time.Duration(in) * time.Second).UTC().Truncate(time.Second) |
| 877 | body, _ := json.Marshal(map[string]string{"at": at.Format(time.RFC3339), "path": "/once"}) |
| 878 | |
| 879 | ctx, cancel := context.WithTimeout(r.Context(), 10*time.Second) |
| 880 | defer cancel() |
| 881 | req, err := http.NewRequestWithContext(ctx, http.MethodPut, "http://carlos/schedule/"+name, bytes.NewReader(body)) |
| 882 | if err != nil { |
| 883 | http.Error(w, "control socket: "+err.Error(), http.StatusInternalServerError) |
| 884 | return |
| 885 | } |
| 886 | req.Header.Set("Authorization", "Bearer "+token) |
| 887 | req.Header.Set("Content-Type", "application/json") |
| 888 | resp, err := a.control.Do(req) |
| 889 | if err != nil { |
| 890 | http.Error(w, "control socket: "+err.Error(), http.StatusBadGateway) |
| 891 | return |
| 892 | } |
| 893 | // Drained before close, so the connection goes back for the next arm. |
| 894 | defer func() { |
| 895 | io.Copy(io.Discard, io.LimitReader(resp.Body, 1<<16)) |
| 896 | resp.Body.Close() |
| 897 | }() |
| 898 | reply, _ := io.ReadAll(io.LimitReader(resp.Body, 4096)) |
| 899 | if resp.StatusCode/100 != 2 { |
| 900 | http.Error(w, fmt.Sprintf("control socket: %d %s", resp.StatusCode, strings.TrimSpace(string(reply))), http.StatusBadGateway) |
| 901 | return |
| 902 | } |
| 903 | w.Header().Set("Content-Type", "application/json") |
| 904 | json.NewEncoder(w).Encode(map[string]any{"name": name, "at": at.Format(time.RFC3339), "due_at": at.Unix()}) |
| 905 | } |
| 906 | |
| 907 | type rowCount struct { |
| 908 | Kind string `json:"kind"` |
| 909 | Region string `json:"region"` |
| 910 | Count int64 `json:"count"` |
| 911 | MinSeq int64 `json:"min_seq"` |
| 912 | MaxSeq int64 `json:"max_seq"` |
| 913 | } |
| 914 | |
| 915 | type firedCount struct { |
| 916 | Kind string `json:"kind"` |
| 917 | Name string `json:"name"` |
| 918 | DueAt int64 `json:"due_at"` |
| 919 | Count int64 `json:"count"` |
| 920 | } |
| 921 | |
| 922 | type objectReport struct { |
| 923 | Key string `json:"key"` |
| 924 | Body string `json:"body"` |
| 925 | Error string `json:"error,omitempty"` |
| 926 | } |
| 927 | |
| 928 | type report struct { |
| 929 | Host string `json:"host"` |
| 930 | Region string `json:"region"` |
| 931 | RegionFrom string `json:"region_from"` |
| 932 | Mode string `json:"mode"` |
| 933 | BootID string `json:"boot_id"` |
| 934 | Rows []rowCount `json:"rows"` |
| 935 | Fired []firedCount `json:"fired"` |
| 936 | FileKeySHA256 string `json:"file_key_sha256"` |
| 937 | PlatformKeySHA256 string `json:"platform_key_sha256"` |
| 938 | Object objectReport `json:"object"` |
| 939 | HasSecret bool `json:"has_secret"` |
| 940 | WorkerPID int `json:"worker_pid"` |
| 941 | WorkerCommitted int64 `json:"worker_writes_committed"` |
| 942 | WorkerFailed int64 `json:"worker_writes_failed"` |
| 943 | WorkerInARow int64 `json:"worker_failed_in_a_row"` |
| 944 | WorkerLastError string `json:"worker_last_error"` |
| 945 | WorkerExit string `json:"worker_exit"` |
| 946 | WorkerLastStatus int64 `json:"worker_last_status_at"` |
| 947 | } |
| 948 | |
| 949 | // counts reads the row counts and the timer fires. Any failed query, scan |
| 950 | // or read part way through is an error, never a shorter list. |
| 951 | func (a *app) counts(ctx context.Context) ([]rowCount, []firedCount, error) { |
| 952 | rowsOut := []rowCount{} |
| 953 | err := a.query(ctx, `SELECT kind, region, count(*), min(seq), max(seq) FROM rows GROUP BY kind, region ORDER BY kind, region`, |
| 954 | func(rows *sql.Rows) error { |
| 955 | var c rowCount |
| 956 | if err := rows.Scan(&c.Kind, &c.Region, &c.Count, &c.MinSeq, &c.MaxSeq); err != nil { |
| 957 | return err |
| 958 | } |
| 959 | rowsOut = append(rowsOut, c) |
| 960 | return nil |
| 961 | }) |
| 962 | if err != nil { |
| 963 | return nil, nil, err |
| 964 | } |
| 965 | fired := []firedCount{} |
| 966 | err = a.query(ctx, `SELECT kind, name, due_at, count(*) FROM rows WHERE kind IN ('tick', 'once') GROUP BY kind, name, due_at ORDER BY kind, name, due_at`, |
| 967 | func(rows *sql.Rows) error { |
| 968 | var c firedCount |
| 969 | if err := rows.Scan(&c.Kind, &c.Name, &c.DueAt, &c.Count); err != nil { |
| 970 | return err |
| 971 | } |
| 972 | fired = append(fired, c) |
| 973 | return nil |
| 974 | }) |
| 975 | if err != nil { |
| 976 | return nil, nil, err |
| 977 | } |
| 978 | return rowsOut, fired, nil |
| 979 | } |
| 980 | |
| 981 | func (a *app) query(ctx context.Context, q string, each func(*sql.Rows) error) error { |
| 982 | rows, err := a.db.QueryContext(ctx, q) |
| 983 | if err != nil { |
| 984 | return err |
| 985 | } |
| 986 | defer rows.Close() |
| 987 | for rows.Next() { |
| 988 | if err := each(rows); err != nil { |
| 989 | return err |
| 990 | } |
| 991 | } |
| 992 | return rows.Err() |
| 993 | } |
| 994 | |
| 995 | func (a *app) handleReport(w http.ResponseWriter, r *http.Request) { |
| 996 | rep := report{ |
| 997 | Host: a.host, Region: a.region, RegionFrom: a.regionFrom, Mode: a.mode, BootID: a.bootID, |
| 998 | PlatformKeySHA256: a.platformFP, |
| 999 | HasSecret: os.Getenv("MOVEPROBE_SECRET") != "", |
| 1000 | } |
| 1001 | a.mu.Lock() |
| 1002 | rep.WorkerPID = a.workerPID |
| 1003 | rep.WorkerCommitted, rep.WorkerFailed = a.workerCommitted, a.workerFailed |
| 1004 | rep.WorkerInARow, rep.WorkerLastError = a.workerInARow, a.workerLastErr |
| 1005 | rep.WorkerExit = a.workerExit |
| 1006 | if !a.workerLastAt.IsZero() { |
| 1007 | rep.WorkerLastStatus = a.workerLastAt.Unix() |
| 1008 | } |
| 1009 | a.mu.Unlock() |
| 1010 | if k, err := a.fileKeyNow(); err == nil { |
| 1011 | rep.FileKeySHA256 = fingerprint(k) |
| 1012 | } |
| 1013 | |
| 1014 | var err error |
| 1015 | if rep.Rows, rep.Fired, err = a.counts(r.Context()); err != nil { |
| 1016 | http.Error(w, "report: "+err.Error(), http.StatusInternalServerError) |
| 1017 | return |
| 1018 | } |
| 1019 | |
| 1020 | rep.Object.Key = a.objKey |
| 1021 | if a.storeErr != nil { |
| 1022 | rep.Object.Error = a.storeErr.Error() |
| 1023 | } else { |
| 1024 | ctx, cancel := context.WithTimeout(r.Context(), storeWait) |
| 1025 | body, err := a.getObject(ctx) |
| 1026 | cancel() |
| 1027 | rep.Object.Body = body |
| 1028 | if err != nil { |
| 1029 | rep.Object.Error = err.Error() |
| 1030 | } |
| 1031 | } |
| 1032 | w.Header().Set("Content-Type", "application/json") |
| 1033 | enc := json.NewEncoder(w) |
| 1034 | enc.SetIndent("", " ") |
| 1035 | enc.Encode(rep) |
| 1036 | } |
| 1037 | |
amadan