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add generic processor with graceful stop and specialized event processor
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| { | ||
| "watch": ["index.ts", "../../src/processor.ts"] | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,55 +1,55 @@ | ||
| import { Client } from "pg"; | ||
| import { TxOBEvent, TxOBProcessorClient } from "../processor"; | ||
|
|
||
| interface Querier { | ||
| query: Client["query"]; | ||
| } | ||
|
|
||
| export const createProcessorClient = <EventType extends string>( | ||
| querier: Querier, | ||
| table: string = "events", | ||
| ): TxOBProcessorClient<EventType> => ({ | ||
| getUnprocessedEvents: async (opts) => { | ||
| const events = await querier.query< | ||
| Pick<TxOBEvent<EventType>, "id" | "errors"> | ||
| >( | ||
| `SELECT id, errors FROM ${table} WHERE processed_at IS NULL AND (backoff_until IS NULL OR backoff_until < NOW()) AND errors < $1`, | ||
| [opts.maxErrors], | ||
| ); | ||
| return events.rows; | ||
| }, | ||
| transaction: async (fn) => { | ||
| try { | ||
| await querier.query("BEGIN"); | ||
| await fn({ | ||
| getEventByIdForUpdateSkipLocked: async (eventId) => { | ||
| const event = await querier.query<TxOBEvent<EventType>>( | ||
| `SELECT id, timestamp, type, data, correlation_id, handler_results, errors, backoff_until, processed_at FROM ${table} WHERE id = $1 FOR UPDATE SKIP LOCKED`, | ||
| [eventId], | ||
| ); | ||
| if (event.rowCount === 0) { | ||
| return null; | ||
| } | ||
|
|
||
| return event.rows[0]; | ||
| }, | ||
| updateEvent: async (event) => { | ||
| await querier.query( | ||
| `UPDATE ${table} SET handler_results = $1, errors = $2, processed_at = $3, backoff_until = $4 WHERE id = $5`, | ||
| [ | ||
| event.handler_results, | ||
| event.errors, | ||
| event.processed_at, | ||
| event.backoff_until, | ||
| event.id, | ||
| ], | ||
| ); | ||
| }, | ||
| }); | ||
| await querier.query("COMMIT"); | ||
| } catch (error) { | ||
| await querier.query("ROLLBACK").catch(() => {}); | ||
| throw error; | ||
| } | ||
| }, | ||
| }); | ||
| import { Client } from "pg"; | ||
| import { TxOBEvent, TxOBProcessorClient } from "../processor"; | ||
|
|
||
| interface Querier { | ||
| query: Client["query"]; | ||
| } | ||
|
|
||
| export const createProcessorClient = <EventType extends string>( | ||
| querier: Querier, | ||
| table: string = "events", | ||
| ): TxOBProcessorClient<EventType> => ({ | ||
| getUnprocessedEvents: async (opts) => { | ||
| const events = await querier.query< | ||
| Pick<TxOBEvent<EventType>, "id" | "errors"> | ||
| >( | ||
| `SELECT id, errors FROM ${table} WHERE processed_at IS NULL AND (backoff_until IS NULL OR backoff_until < NOW()) AND errors < $1`, | ||
| [opts.maxErrors], | ||
| ); | ||
| return events.rows; | ||
| }, | ||
| transaction: async (fn) => { | ||
| try { | ||
| await querier.query("BEGIN"); | ||
| await fn({ | ||
| getEventByIdForUpdateSkipLocked: async (eventId) => { | ||
| const event = await querier.query<TxOBEvent<EventType>>( | ||
| `SELECT id, timestamp, type, data, correlation_id, handler_results, errors, backoff_until, processed_at FROM ${table} WHERE id = $1 FOR UPDATE SKIP LOCKED`, | ||
| [eventId], | ||
| ); | ||
| if (event.rowCount === 0) { | ||
| return null; | ||
| } | ||
|
|
||
| return event.rows[0]; | ||
| }, | ||
| updateEvent: async (event) => { | ||
| await querier.query( | ||
| `UPDATE ${table} SET handler_results = $1, errors = $2, processed_at = $3, backoff_until = $4 WHERE id = $5`, | ||
| [ | ||
| event.handler_results, | ||
| event.errors, | ||
| event.processed_at, | ||
| event.backoff_until, | ||
| event.id, | ||
| ], | ||
| ); | ||
| }, | ||
| }); | ||
| await querier.query("COMMIT"); | ||
| } catch (error) { | ||
| await querier.query("ROLLBACK").catch(() => {}); | ||
| throw error; | ||
| } | ||
| }, | ||
| }); |
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