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Iterable interface for IOperation (#252)
* Iterable interface for IOperation Signed-off-by: Levko Kravets <[email protected]> * Chore: split `utils` unit tests into few files Signed-off-by: Levko Kravets <[email protected]> * Add tests Signed-off-by: Levko Kravets <[email protected]> * Add visibility modifiers Signed-off-by: Levko Kravets <[email protected]> * Fixes after merge Signed-off-by: Levko Kravets <[email protected]> * Fix import Signed-off-by: Levko Kravets <[email protected]> --------- Signed-off-by: Levko Kravets <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| import IOperation, { IOperationChunksIterator, IOperationRowsIterator, IteratorOptions } from '../contracts/IOperation'; | ||
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| abstract class OperationIterator<R> implements AsyncIterableIterator<R> { | ||
| public readonly operation: IOperation; | ||
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| protected readonly options?: IteratorOptions; | ||
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| constructor(operation: IOperation, options?: IteratorOptions) { | ||
| this.operation = operation; | ||
| this.options = options; | ||
| } | ||
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| protected abstract getNext(): Promise<IteratorResult<R>>; | ||
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| public [Symbol.asyncIterator]() { | ||
| return this; | ||
| } | ||
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| public async next() { | ||
| const result = await this.getNext(); | ||
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| if (result.done && this.options?.autoClose) { | ||
| await this.operation.close(); | ||
| } | ||
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| return result; | ||
| } | ||
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| // This method is intended for a cleanup when the caller does not intend to make any more | ||
| // reads from iterator (e.g. when using `break` in a `for ... of` loop) | ||
| public async return(value?: any) { | ||
| if (this.options?.autoClose) { | ||
| await this.operation.close(); | ||
| } | ||
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| return { done: true, value }; | ||
| } | ||
| } | ||
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| export class OperationChunksIterator extends OperationIterator<Array<object>> implements IOperationChunksIterator { | ||
| protected async getNext(): Promise<IteratorResult<Array<object>>> { | ||
| const hasMoreRows = await this.operation.hasMoreRows(); | ||
| if (hasMoreRows) { | ||
| const value = await this.operation.fetchChunk(this.options); | ||
| return { done: false, value }; | ||
| } | ||
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| return { done: true, value: undefined }; | ||
| } | ||
| } | ||
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| export class OperationRowsIterator extends OperationIterator<object> implements IOperationRowsIterator { | ||
| private chunk: Array<object> = []; | ||
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| private index: number = 0; | ||
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| constructor(operation: IOperation, options?: IteratorOptions) { | ||
| super(operation, { | ||
| ...options, | ||
| // Tell slicer to return raw chunks. We're going to process rows one by one anyway, | ||
| // so no need to additionally buffer and slice chunks returned by server | ||
| disableBuffering: true, | ||
| }); | ||
| } | ||
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| protected async getNext(): Promise<IteratorResult<object>> { | ||
| if (this.index < this.chunk.length) { | ||
| const value = this.chunk[this.index]; | ||
| this.index += 1; | ||
| return { done: false, value }; | ||
| } | ||
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| const hasMoreRows = await this.operation.hasMoreRows(); | ||
| if (hasMoreRows) { | ||
| this.chunk = await this.operation.fetchChunk(this.options); | ||
| this.index = 0; | ||
| // Note: this call is not really a recursion. Since this method is | ||
| // async - the call will be actually scheduled for processing on | ||
| // the next event loop cycle | ||
| return this.getNext(); | ||
| } | ||
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| return { done: true, value: undefined }; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| const { expect } = require('chai'); | ||
| const sinon = require('sinon'); | ||
| const config = require('./utils/config'); | ||
| const { DBSQLClient } = require('../../lib'); | ||
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| async function openSession(customConfig) { | ||
| const client = new DBSQLClient(); | ||
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| const clientConfig = client.getConfig(); | ||
| sinon.stub(client, 'getConfig').returns({ | ||
| ...clientConfig, | ||
| ...customConfig, | ||
| }); | ||
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| const connection = await client.connect({ | ||
| host: config.host, | ||
| path: config.path, | ||
| token: config.token, | ||
| }); | ||
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| return connection.openSession({ | ||
| initialCatalog: config.database[0], | ||
| initialSchema: config.database[1], | ||
| }); | ||
| } | ||
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| function arrayChunks(arr, chunkSize) { | ||
| const result = []; | ||
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| while (arr.length > 0) { | ||
| const chunk = arr.splice(0, chunkSize); | ||
| result.push(chunk); | ||
| } | ||
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| return result; | ||
| } | ||
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| describe('Iterators', () => { | ||
| it('should iterate over all chunks', async () => { | ||
| const session = await openSession({ arrowEnabled: false }); | ||
| sinon.spy(session.context.driver, 'fetchResults'); | ||
| try { | ||
| const expectedRowsCount = 10; | ||
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| // set `maxRows` to null to disable direct results so all the data are fetched through `driver.fetchResults` | ||
| const operation = await session.executeStatement(`SELECT * FROM range(0, ${expectedRowsCount})`, { | ||
| maxRows: null, | ||
| }); | ||
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| const expectedRows = Array.from({ length: expectedRowsCount }, (_, id) => ({ id })); | ||
| const chunkSize = 4; | ||
| const expectedChunks = arrayChunks(expectedRows, chunkSize); | ||
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| let index = 0; | ||
| for await (const chunk of operation.iterateChunks({ maxRows: chunkSize })) { | ||
| expect(chunk).to.deep.equal(expectedChunks[index]); | ||
| index += 1; | ||
| } | ||
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| expect(index).to.equal(expectedChunks.length); | ||
| } finally { | ||
| await session.close(); | ||
| } | ||
| }); | ||
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| it('should iterate over all rows', async () => { | ||
| const session = await openSession({ arrowEnabled: false }); | ||
| sinon.spy(session.context.driver, 'fetchResults'); | ||
| try { | ||
| const expectedRowsCount = 10; | ||
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| const operation = await session.executeStatement(`SELECT * FROM range(0, ${expectedRowsCount})`); | ||
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| const expectedRows = Array.from({ length: expectedRowsCount }, (_, id) => ({ id })); | ||
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| let index = 0; | ||
| for await (const row of operation.iterateRows()) { | ||
| expect(row).to.deep.equal(expectedRows[index]); | ||
| index += 1; | ||
| } | ||
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| expect(index).to.equal(expectedRows.length); | ||
| } finally { | ||
| await session.close(); | ||
| } | ||
| }); | ||
| }); |
94 changes: 1 addition & 93 deletions
94
tests/unit/utils.test.js → tests/unit/utils/CloseableCollection.test.js
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