87 lines
2.2 KiB
TypeScript
87 lines
2.2 KiB
TypeScript
import type { Message } from './message.gen';
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import type { RawMessage } from './raw.gen';
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import { MType } from './raw.gen';
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import RawMessageReader from './RawMessageReader.gen';
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import resolveURL from './urlBasedResolver'
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import Logger from 'App/logger'
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// TODO: composition instead of inheritance
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// needSkipMessage() and next() methods here use buf and p protected properties,
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// which should be probably somehow incapsulated
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export default class MFileReader extends RawMessageReader {
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private pLastMessageID: number = 0
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private currentTime: number
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public error: boolean = false
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constructor(data: Uint8Array, private startTime?: number, private logger=console) {
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super(data)
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}
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private needSkipMessage(): boolean {
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if (this.p === 0) return false
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for (let i = 7; i >= 0; i--) {
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if (this.buf[ this.p + i ] !== this.buf[ this.pLastMessageID + i ]) {
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return this.buf[ this.p + i ] < this.buf[ this.pLastMessageID + i ]
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}
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}
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return false
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}
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private getLastMessageID(): number {
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let id = 0
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for (let i = 0; i< 8; i++) {
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id += this.buf[ this.p + i ] * 2**(8*i)
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}
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return id
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}
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private readRawMessage(): RawMessage | null {
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this.skip(8)
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try {
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const msg = super.readMessage()
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if (!msg) {
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this.skip(-8)
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}
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return msg
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} catch (e) {
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this.error = true
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this.logger.error("Read message error:", e)
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return null
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}
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}
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readNext(): Message & { _index: number } | null {
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if (this.error || !this.hasNextByte()) {
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return null
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}
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while (this.needSkipMessage()) {
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const skippedMessage = this.readRawMessage()
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if (!skippedMessage) {
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return null
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}
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Logger.group("Openreplay: Skipping messages ", skippedMessage)
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}
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this.pLastMessageID = this.p
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const rMsg = this.readRawMessage()
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if (!rMsg) {
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return null
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}
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if (rMsg.tp === MType.Timestamp) {
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if (!this.startTime) {
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this.startTime = rMsg.timestamp
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}
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this.currentTime = rMsg.timestamp - this.startTime
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return this.readNext()
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}
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const index = this.getLastMessageID()
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const msg = Object.assign(resolveURL(rMsg), {
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time: this.currentTime,
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_index: index,
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})
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return msg
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}
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}
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