8 lines
2.4 KiB
Plaintext
8 lines
2.4 KiB
Plaintext
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{
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"version": 3,
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"sources": ["../../../src/dialects/mssql/async-queue.ts"],
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"sourcesContent": ["import BaseError from '../../errors/base-error';\nimport ConnectionError from '../../errors/connection-error';\n\n/**\n * Thrown when a connection to a database is closed while an operation is in progress\n */\nexport class AsyncQueueError extends BaseError {\n constructor(message: string) {\n super(message);\n this.name = 'SequelizeAsyncQueueError';\n }\n}\n\nclass AsyncQueue {\n previous: Promise<unknown>;\n closed: boolean;\n rejectCurrent: (reason?: any) => void;\n\n constructor() {\n this.previous = Promise.resolve();\n this.closed = false;\n this.rejectCurrent = () => {\n /** do nothing */\n };\n }\n\n close() {\n this.closed = true;\n this.rejectCurrent(\n new ConnectionError(\n new AsyncQueueError(\n 'the connection was closed before this query could finish executing'\n )\n )\n );\n }\n\n enqueue(asyncFunction: (...args: any[]) => Promise<unknown>) {\n // This outer promise might seems superflous since down below we return asyncFunction().then(resolve, reject).\n // However, this ensures that this.previous will never be a rejected promise so the queue will\n // always keep going, while still communicating rejection from asyncFunction to the user.\n return new Promise((resolve, reject) => {\n this.previous = this.previous.then(() => {\n this.rejectCurrent = reject;\n if (this.closed) {\n return reject(\n new ConnectionError(\n new AsyncQueueError(\n 'the connection was closed before this query could be executed'\n )\n )\n );\n }\n return asyncFunction().then(resolve, reject);\n });\n });\n }\n}\n\nexport default AsyncQueue;\n"],
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"names": []
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}
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