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94 lines
1.9 KiB
94 lines
1.9 KiB
import { Result } from "./result.mjs"; |
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import { PawSQLiteError } from "./pawsqlite_error.mjs"; |
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import { query } from "./query.mjs"; |
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export class Transaction { |
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constructor(dbName, adapter, enqueue, rollbackOnError=false) { |
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this.dbName = dbName; |
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this.adapter = adapter; |
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this._rollbackOnError = rollbackOnError; |
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this._enqueue = enqueue; |
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this._completeCb = null; |
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this._readyWait = null; |
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this._ready = false; |
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this._finalized = false; |
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} |
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async sql(sql, ...args) { |
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if (this._finalized) { |
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throw new PawSQLiteError("Transaction has already completed"); |
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} |
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if (!this._ready) { |
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await this._waitUntilReady(); |
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} |
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let result; |
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try { |
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result = await this.adapter.sql(this.dbName, ...query(sql, ...args)); |
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} catch (e) { |
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if (this._rollbackOnError) { |
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await this.rollback(); |
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} |
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throw e; |
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} |
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return new Result(result); |
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} |
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commit() { |
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return this._complete("COMMIT"); |
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} |
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rollback() { |
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return this._complete("ROLLBACK"); |
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} |
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async _waitUntilReady() { |
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if (!this._readyWait) { |
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this._readyWait = (async () => { |
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this._completeCb = await this._enqueue(); |
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await this._begin(); |
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this._ready = true; |
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})(); |
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} |
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await this._readyWait; |
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} |
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async _begin() { |
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const result = await this.adapter.sql(this.dbName, "BEGIN"); |
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} |
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async _complete(sql) { |
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if (this._finalized) { |
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throw new PawSQLiteError("Transaction has already completed"); |
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} |
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this._finalized = true; |
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if (!this._readyWait) { |
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// Transaction was unused |
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return; |
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} else if (!this._ready) { |
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await this._waitUntilReady(); |
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} |
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let result; |
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let error; |
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try { |
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result = await this.adapter.sql(this.dbName, sql); |
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} catch (e) { |
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error = e; |
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} |
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this._completeCb(); |
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if (error) { |
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throw error; |
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} |
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return new Result(result); |
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} |
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} |