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import promiseRetry from 'promise-retry'
import { IDatabaseClient, ITransactionClient } from './IDatabaseClient'
import { RetryOptions } from '../core/types'
import { monitor, MonitorEvents } from '../monitor/monitor'
const transientErrorCodes = new Set([
'ECONNRESET',
'ETIMEDOUT',
'PROTOCOL_CONNECTION_LOST',
'ECONNREFUSED',
])
/**
* Checks if the given error is a transient error that can be retried
*
* Transient errors are temporary network or connection issues that typically
* resolve themselves and can be safely retried. This function checks if the
* error code matches known transient error patterns for MySQL connections.
*
* @param error - The error object to check
* @returns boolean - True if the error is transient and can be retried, false otherwise
*
* @example
* try {
* const result = await pool.execute(sql, params);
* } catch (error) {
* if (isTransientError(error)) {
* // Retry the operation
* console.log('Transient error detected, retrying...');
* } else {
* // Handle permanent error
* throw error;
* }
* }
*/
function isTransientError(error: any): boolean {
return error && error.code && transientErrorCodes.has(error.code)
}
/**
* Creates a MySQL database client
*
* This function initializes a MySQL database client with the provided pool configuration
* and optional retry options. It sets up monitoring for connection events and query operations.
*
* @param pool - The MySQL pool instance
* @param retryOptions - Optional retry options for failed queries
* @returns IDatabaseClient - The MySQL database client instance
*
* @example
* const mysqlClient = createMysqlClient(pool, { retries: 3, factor: 2, minTimeout: 1000 });
*
* @example
* const mysqlClient = createMysqlClient(pool, { retries: 3, factor: 2, minTimeout: 1000 });
*
* @example
* const mysqlClient = createMysqlClient(pool, { retries: 3, factor: 2, minTimeout: 1000 });
*
* @example
* const mysqlClient = createMysqlClient(pool, { retries: 3, factor: 2, minTimeout: 1000 });
*/
export const createMysqlClient = (
pool: Pool,
retryOptions?: RetryOptions
): IDatabaseClient => {
monitor.emit(MonitorEvents.CONNECTION_CREATED, {
clientType: 'mysql',
poolOptions: pool.config,
})
return {
clientType: 'mysql',
query: async <T>(sql: string, params?: any[]): Promise<T> => {
return promiseRetry(async (retry, attempt) => {
const startTime = Date.now()
try {
monitor.emit(MonitorEvents.QUERY_START, {
clientType: 'mysql',
sql,
params,
attempt,
})
const [rows] = await pool.execute(sql, params)
const elapsedTime = Date.now() - startTime
monitor.emit(MonitorEvents.QUERY_END, {
clientType: 'mysql',
sql,
params,
attempt,
elapsedTime,
})
return rows as unknown as T
} catch (error: any) {
const elapsedTime = Date.now() - startTime
monitor.emit(MonitorEvents.QUERY_ERROR, {
clientType: 'mysql',
sql,
params,
attempt,
elapsedTime,
error,
})
if (isTransientError(error)) {
console.warn(
`MySQL query attempt ${attempt} failed, retrying...`,
error
)
monitor.emit(MonitorEvents.RETRY_ATTEMPT, {
clientType: 'mysql',
sql,
params,
attempt,
error,
})
return retry(error)
}
throw error
}
}, retryOptions)
},
beginTransaction: async (): Promise<ITransactionClient> => {
const connection: PoolConnection = await pool.getConnection()
try {
await connection.beginTransaction()
return {
query: async <T>(sql: string, params?: any[]): Promise<T> => {
const startTime = Date.now()
try {
monitor.emit(MonitorEvents.QUERY_START, {
clientType: 'mysql',
sql,
params,
attempt: 1,
inTransaction: true,
})
const [rows] = await connection.execute(sql, params)
const elapsedTime = Date.now() - startTime
monitor.emit(MonitorEvents.QUERY_END, {
clientType: 'mysql',
sql,
params,
attempt: 1,
elapsedTime,
inTransaction: true,
})
return rows as unknown as T
} catch (error) {
const elapsedTime = Date.now() - startTime
monitor.emit(MonitorEvents.QUERY_ERROR, {
clientType: 'mysql',
sql,
params,
attempt: 1,
elapsedTime,
error,
inTransaction: true,
})
throw error
}
},
commit: async (): Promise<void> => {
try {
await connection.commit()
monitor.emit(MonitorEvents.TRANSACTION_COMMIT, {
clientType: 'mysql',
})
} finally {
connection.release()
}
},
rollback: async (): Promise<void> => {
try {
await connection.rollback()
monitor.emit(MonitorEvents.TRANSACTION_ROLLBACK, {
clientType: 'mysql',
})
} finally {
connection.release()
}
},
}
} catch (error) {
connection.release()
throw error
}
},
}
}
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