Kristaps Fabians Geikins
51 lines
1.2 KiB
TypeScript
51 lines
1.2 KiB
TypeScript
import { ensureError } from '@speckle/shared'
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import { Transform, TransformCallback } from 'stream'
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/**
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* A stream that converts database objects stream to "{id}\t{data_json}\n" stream or a json stream of obj.data fields
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*/
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class SpeckleObjectsStream extends Transform {
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simpleText: boolean
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isFirstObject: boolean
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constructor(simpleText: boolean) {
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super({ writableObjectMode: true })
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this.simpleText = simpleText
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if (!this.simpleText) this.push('[')
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this.isFirstObject = true
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}
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_transform(
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dbObj: { dataText: string; id: string; data?: Record<string, unknown> },
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_encoding: BufferEncoding,
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callback: TransformCallback
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) {
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let objData = dbObj.dataText
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if (objData === undefined) objData = JSON.stringify(dbObj.data)
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try {
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if (this.simpleText) {
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this.push(`${dbObj.id}\t`)
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this.push(objData)
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this.push('\n')
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} else {
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// JSON output
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if (!this.isFirstObject) this.push(',')
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this.push(objData)
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this.isFirstObject = false
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}
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callback()
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} catch (e) {
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callback(ensureError(e))
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}
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}
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_flush(callback: TransformCallback) {
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if (!this.simpleText) this.push(']')
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callback()
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}
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}
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export { SpeckleObjectsStream }
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