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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 | 86x 1x 1x 1x 1x 1x 1x 1x 1x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 2x 2x 2x 1x 32x 1x 31x 33x 33x 33x 33x 33x 31x 31x 31x 33x 33x 5x 33x 3x 3x 3x 38x 1x 37x 37x 21x 16x 16x 16x 3x 3x 3x 3x 3x 1x 1x 1x 3x 1x 1x 3x 1x 1x 40x 19x 21x 21x 21x 3x 9x 9x 8x 1x 50x 50x 50x 50x 50x 50x 50x 50x 103x 50x 50x 19x 19x 19x 12x 19x 19x 1x 19x 50x 50x 50x 50x 50x 50x 50x 12x 38x 2x 50x 50x 50x 50x 33x 103x 103x 103x 103x 50x 50x 40x 40x 7x 7x 6x 6x 50x 35x 15x 15x 5x 5x 10x 45x 1x 1x 1x 44x 44x 1x 44x 1x 44x 15x 15x 15x 15x 15x 15x 29x 25x 25x 4x 4x 4x 1x 4x 5x 5x 2x 5x 9x 9x 9x 9x 9x 40x 40x 40x 17x 7x 7x 7x 7x 7x 1x 6x 6x 40x 1x 39x 36x 36x 1x 35x 35x 9x 9x 9x 9x 9x 9x 19x 13x 6x 19x 19x 19x 19x 19x 19x 1x | import {Checksum256, Name, UInt64} from '@wharfkit/antelope' import { ActionStreamFilter, ActionStreamOptions, ErrorCode, StreamAction, StreamGap, StreamOverflow, StreamState, WsAckMessage, WsActionMessage, WsServerMessage, WsSubscribeMessage, } from './types' const DEFAULT_RECONNECT_DELAY = 1000 const DEFAULT_RECONNECT_MAX_DELAY = 30000 const DEFAULT_ACK_INTERVAL = 1000 const DEFAULT_QUEUE_SIZE = 1000 const DEFAULT_HEALTHY_THRESHOLD = 10000 const START_AT_HEAD_SENTINEL = UInt64.from(UInt64.max) export class ActionStreamClient { private url: string private filter: ActionStreamFilter private decode: boolean private reconnectDelay: number private reconnectMaxDelay: number private ackInterval: number private queueSize: number private healthyThreshold: number private startAtHead: boolean private ws: WebSocket | null = null private currentSeq: UInt64 private lastAcked: UInt64 = UInt64.from(0) private closed = false private _connected = false private _catchupComplete = false private _headSeq: UInt64 = UInt64.from(0) private _libSeq: UInt64 = UInt64.from(0) private queue: StreamAction[] = [] private waitingResolve: ((action: StreamAction) => void) | null = null private waitingReject: ((err: Error) => void) | null = null private reconnectTimer: ReturnType<typeof setTimeout> | null = null private currentBackoff: number private readonly ackIntervalU64: UInt64 private hasAcked = false private catchupCompleteAt: number | null = null private _overflowCount = 0 private expectedSubSeq: number | null = 1 onHeartbeat?: (state: StreamState) => void onCatchupComplete?: (state: StreamState) => void onError?: (code: number, message: string) => void onConnect?: () => void onDisconnect?: () => void onOverflow?: (overflow: StreamOverflow) => void onGap?: (gap: StreamGap) => void constructor(url: string, filter: ActionStreamFilter, options?: ActionStreamOptions) { this.url = url this.filter = filter this.decode = options && options.decode !== undefined ? options.decode : true this.reconnectDelay = options && options.reconnectDelay !== undefined ? options.reconnectDelay : DEFAULT_RECONNECT_DELAY this.reconnectMaxDelay = options && options.reconnectMaxDelay !== undefined ? options.reconnectMaxDelay : DEFAULT_RECONNECT_MAX_DELAY this.ackInterval = options && options.ackInterval !== undefined ? options.ackInterval : DEFAULT_ACK_INTERVAL this.queueSize = options && options.queueSize !== undefined ? options.queueSize : DEFAULT_QUEUE_SIZE this.healthyThreshold = options && options.healthyThreshold !== undefined ? options.healthyThreshold : DEFAULT_HEALTHY_THRESHOLD this.startAtHead = options !== undefined && options.startSeq === 'head' this.currentSeq = options && options.startSeq !== undefined && !this.startAtHead ? UInt64.from(options.startSeq) : UInt64.from(0) this.currentBackoff = this.reconnectDelay this.ackIntervalU64 = UInt64.from(this.ackInterval) } get headSeq(): UInt64 { return this._headSeq } get libSeq(): UInt64 { return this._libSeq } get connected(): boolean { return this._connected } get catchupComplete(): boolean { return this._catchupComplete } get overflowCount(): number { return this._overflowCount } connect(): void { if (this.closed) { throw new Error('Client is closed') } this.dial() } close(): void { Iif (this.closed) { return } this.closed = true Iif (this.reconnectTimer) { clearTimeout(this.reconnectTimer) this.reconnectTimer = null } const wasConnected = this._connected if (this.ws) { this.ws.onclose = null this.ws.close() this.ws = null } this._connected = false if (wasConnected && this.onDisconnect) { this.onDisconnect() } if (this.waitingReject) { this.waitingReject(new Error('Client closed')) this.waitingResolve = null this.waitingReject = null } } next(): Promise<StreamAction> { if (this.closed) { return Promise.reject(new Error('Client closed')) } const queued = this.takeQueued() if (queued) { return Promise.resolve(queued) } return new Promise<StreamAction>((resolve, reject) => { this.waitingResolve = resolve this.waitingReject = reject }) } nextWithTimeout(timeoutMs: number): Promise<StreamAction | null> { Iif (this.closed) { return Promise.reject(new Error('Client closed')) } const queued = this.takeQueued() Iif (queued) { return Promise.resolve(queued) } return new Promise<StreamAction | null>((resolve, reject) => { const timer = setTimeout(() => { this.waitingResolve = null this.waitingReject = null resolve(null) }, timeoutMs) this.waitingResolve = (action: StreamAction) => { clearTimeout(timer) resolve(action) } this.waitingReject = (err: Error) => { clearTimeout(timer) reject(err) } }) } private takeQueued(): StreamAction | null { if (this.queue.length === 0) { return null } const action = this.queue.shift()! this.ackSeq(action) return action } async *[Symbol.asyncIterator](): AsyncIterableIterator<StreamAction> { while (!this.closed) { try { const action = await this.next() yield action } catch { return } } } // resetConnectionState clears every field whose lifetime is one socket. private resetConnectionState(): void { this.catchupCompleteAt = null this.expectedSubSeq = 1 } private dial(): void { const ws = new WebSocket(this.url) this.ws = ws this.resetConnectionState() ws.onopen = () => { this.sendSubscribe() } ws.onmessage = (event: MessageEvent) => { this.handleMessage(event.data) } ws.onerror = () => { // onclose will fire after onerror } ws.onclose = () => { const wasConnected = this._connected this._connected = false if (wasConnected && this.onDisconnect) { this.onDisconnect() } if (!this.closed) { if (this.wasHealthy()) { this.currentBackoff = this.reconnectDelay } this.scheduleReconnect() } } } private sendSubscribe(): void { Iif (!this.ws) { return } const msg: WsSubscribeMessage = { type: 'subscribe', } if (this.filter.contracts && this.filter.contracts.length > 0) { msg.contracts = this.filter.contracts.map((c) => String(Name.from(c))) } Iif (this.filter.receivers && this.filter.receivers.length > 0) { msg.receivers = this.filter.receivers.map((r) => String(Name.from(r))) } Iif (this.filter.actions && this.filter.actions.length > 0) { msg.actions = this.filter.actions.map((a) => String(Name.from(a))) } if (this.currentSeq.gt(UInt64.from(0))) { msg.start_seq = this.currentSeq.toString() } else if (this.startAtHead) { msg.start_seq = START_AT_HEAD_SENTINEL.toString() } msg.decode = this.decode this.ws.send(JSON.stringify(msg)) this._connected = true if (this.onConnect) { this.onConnect() } } private handleMessage(data: string | ArrayBuffer | Blob): void { Iif (typeof data !== 'string') { return } let msg: WsServerMessage try { msg = JSON.parse(data) as WsServerMessage } catch { return } switch (msg.type) { case 'action': this.handleAction(msg) break case 'heartbeat': this.handleHeartbeat(msg) break case 'catchup_complete': this.handleCatchupComplete(msg) break case 'error': this.handleError(msg) break } } private handleAction(msg: WsActionMessage): void { if (msg.sub_seq === undefined) { this.expectedSubSeq = null } else if (this.expectedSubSeq !== null) { if (msg.sub_seq !== this.expectedSubSeq) { this.handleGap(msg.sub_seq) return } this.expectedSubSeq = msg.sub_seq + 1 } if (!msg.trx_id) { if (this.onError) { this.onError( ErrorCode.DataInconsistent, `Action ${msg.global_seq} arrived without a trx_id` ) } return } const action: StreamAction = { globalSeq: UInt64.from(msg.global_seq), blockNum: msg.block_num, blockTime: msg.block_time, contract: Name.from(msg.contract), action: Name.from(msg.action), receiver: Name.from(msg.receiver), trxId: Checksum256.from(msg.trx_id), } if (msg.hex_data) { action.hexData = msg.hex_data } if (msg.data) { action.data = msg.data } if (this.waitingResolve) { const resolve = this.waitingResolve this.waitingResolve = null this.waitingReject = null this.acceptSeq(action) this.ackSeq(action) resolve(action) } else if (this.queue.length < this.queueSize) { this.queue.push(action) this.acceptSeq(action) } else { this.handleOverflow(action) } } private handleOverflow(action: StreamAction): void { this._overflowCount++ if (this.onOverflow) { this.onOverflow({ droppedFrom: action.globalSeq, resumeSeq: this.currentSeq, queueSize: this.queue.length, overflowCount: this._overflowCount, }) } this.resubscribe() } private handleGap(received: number): void { const expected = this.expectedSubSeq! if (this.onGap) { this.onGap({expected, received, resumeSeq: this.currentSeq}) } this.resubscribe() } private resubscribe(): void { Iif (!this.ws) { return } const ws = this.ws this.ws = null // Leave onclose wired: it owns the disconnect notice and the reconnect schedule. ws.onmessage = null ws.close() } private handleHeartbeat(msg: {head_seq: string; lib_seq: string}): void { this._headSeq = UInt64.from(msg.head_seq) this._libSeq = UInt64.from(msg.lib_seq) if (this.onHeartbeat) { this.onHeartbeat({headSeq: this._headSeq, libSeq: this._libSeq}) } } private handleCatchupComplete(msg: {head_seq: string; lib_seq: string}): void { this._headSeq = UInt64.from(msg.head_seq) this._libSeq = UInt64.from(msg.lib_seq) this._catchupComplete = true this.catchupCompleteAt = Date.now() if (this.onCatchupComplete) { this.onCatchupComplete({headSeq: this._headSeq, libSeq: this._libSeq}) } } private handleError(msg: {code: number; message: string}): void { if (this.onError) { this.onError(msg.code, msg.message) } } private acceptSeq(action: StreamAction): void { if (action.globalSeq.lt(this.currentSeq)) { return } this.currentSeq = action.globalSeq.adding(1).cast(UInt64) } private ackSeq(action: StreamAction): void { Iif (this.ackInterval <= 0) { return } if (this.hasAcked && action.globalSeq.lte(this.lastAcked)) { return } const diff = action.globalSeq.subtracting(this.lastAcked) if (diff.gte(this.ackIntervalU64)) { this.lastAcked = action.globalSeq this.hasAcked = true this.sendAck(action.globalSeq) } } private sendAck(seq: UInt64): void { Iif (!this.ws || this.ws.readyState !== WebSocket.OPEN) { return } const msg: WsAckMessage = { type: 'ack', seq: seq.toString(), } this.ws.send(JSON.stringify(msg)) } private wasHealthy(): boolean { if (this.catchupCompleteAt === null) { return false } return Date.now() - this.catchupCompleteAt >= this.healthyThreshold } private scheduleReconnect(): void { const delay = this.currentBackoff this.currentBackoff = Math.min(this.currentBackoff * 2, this.reconnectMaxDelay) this.reconnectTimer = setTimeout(() => { this.reconnectTimer = null Iif (this.closed) { return } this.dial() }, delay) } } |