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specially\n  important for auto-loaders and meta-packages.\n*/\ninterface QueryOptions {\n  sql: string;\n  values?: any | any[] | { [param: string]: any };\n}\n\ninterface Query {\n  sql: string;\n}\n\ninterface Config {\n  host?: string;\n  port?: number;\n  database?: string;\n  user?: string;\n  connectionConfig?: Config;\n}\n/**\n * Get an Attributes map from a mysql connection config object\n *\n * @param config ConnectionConfig\n */\nexport function getConnectionAttributes(config: Config): Attributes {\n  const { host, port, database, user } = getConfig(config);\n  const portNumber = parseInt(port, 10);\n  if (!isNaN(portNumber)) {\n    return {\n      [SEMATTRS_NET_PEER_NAME]: host,\n      [SEMATTRS_NET_PEER_PORT]: portNumber,\n      [SEMATTRS_DB_CONNECTION_STRING]: getJDBCString(host, port, database),\n      [SEMATTRS_DB_NAME]: database,\n      [SEMATTRS_DB_USER]: user,\n    };\n  }\n  return {\n    [SEMATTRS_NET_PEER_NAME]: host,\n    [SEMATTRS_DB_CONNECTION_STRING]: getJDBCString(host, port, database),\n    [SEMATTRS_DB_NAME]: database,\n    [SEMATTRS_DB_USER]: user,\n  };\n}\n\nfunction getConfig(config: any) {\n  const { host, port, database, user } =\n    (config && config.connectionConfig) || config || {};\n  return { host, port, database, user };\n}\n\nfunction getJDBCString(\n  host: string | undefined,\n  port: number | undefined,\n  database: string | undefined\n) {\n  let jdbcString = `jdbc:mysql://${host || 'localhost'}`;\n\n  if (typeof port === 'number') {\n    jdbcString += `:${port}`;\n  }\n\n  if (typeof database === 'string') {\n    jdbcString += `/${database}`;\n  }\n\n  return jdbcString;\n}\n\n/**\n * Conjures up the value for the db.statement attribute by formatting a SQL query.\n *\n * @returns the database statement being executed.\n */\nexport function getDbStatement(\n  query: string | Query | QueryOptions,\n  format?: formatType,\n  values?: any[]\n): string {\n  if (!format) {\n    return typeof query === 'string' ? query : query.sql;\n  }\n  if (typeof query === 'string') {\n    return values ? format(query, values) : query;\n  } else {\n    // According to https://github.com/mysqljs/mysql#performing-queries\n    // The values argument will override the values in the option object.\n    return values || (query as QueryOptions).values\n      ? format(query.sql, values || (query as QueryOptions).values)\n      : query.sql;\n  }\n}\n\n/**\n * The span name SHOULD be set to a low cardinality value\n * representing the statement executed on the database.\n *\n * @returns SQL statement without variable arguments or SQL verb\n */\nexport function getSpanName(query: string | Query | QueryOptions): string {\n  const rawQuery = typeof query === 'object' ? query.sql : query;\n  // Extract the SQL verb\n  const firstSpace = rawQuery?.indexOf(' ');\n  if (typeof firstSpace === 'number' && firstSpace !== -1) {\n    return rawQuery?.substring(0, firstSpace);\n  }\n  return rawQuery;\n}\n\nexport const once = (fn: Function) => {\n  let called = false;\n  return (...args: unknown[]) => {\n    if (called) return;\n    called = true;\n    return fn(...args);\n  };\n};\n\nexport function getConnectionPrototypeToInstrument(connection: any) {\n  const connectionPrototype = connection.prototype;\n  const basePrototype = Object.getPrototypeOf(connectionPrototype);\n\n  // mysql2@3.11.5 included a refactoring, where most code was moved out of the `Connection` class and into a shared base\n  // so we need to instrument that instead, see https://github.com/sidorares/node-mysql2/pull/3081\n  // This checks if the functions we're instrumenting are there on the base - we cannot use the presence of a base\n  // prototype since EventEmitter is the base for mysql2@<=3.11.4\n  if (\n    typeof basePrototype?.query === 'function' &&\n    typeof basePrototype?.execute === 'function'\n  ) {\n    return basePrototype;\n  }\n\n  // otherwise instrument the connection directly.\n  return connectionPrototype;\n}\n"]}