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from __future__ import annotations
import json
import os
from pathlib import Path
from typing import TYPE_CHECKING, Any, Iterable, Mapping, TypeVar
import trino
from trino.exceptions import DatabaseError
from trino.transaction import IsolationLevel
from airflow.configuration import conf
from airflow.exceptions import AirflowException
from airflow.providers.common.sql.hooks.sql import DbApiHook
from airflow.utils.helpers import exactly_one
from airflow.utils.operator_helpers import AIRFLOW_VAR_NAME_FORMAT_MAPPING, DEFAULT_FORMAT_PREFIX
if TYPE_CHECKING:
from airflow.models import Connection
[docs]def generate_trino_client_info() -> str:
"""Return json string with dag_id, task_id, execution_date and try_number."""
context_var = {
format_map["default"].replace(DEFAULT_FORMAT_PREFIX, ""): os.environ.get(
format_map["env_var_format"], ""
)
for format_map in AIRFLOW_VAR_NAME_FORMAT_MAPPING.values()
}
task_info = {
"dag_id": context_var["dag_id"],
"task_id": context_var["task_id"],
"execution_date": context_var["execution_date"],
"try_number": context_var["try_number"],
"dag_run_id": context_var["dag_run_id"],
"dag_owner": context_var["dag_owner"],
}
return json.dumps(task_info, sort_keys=True)
[docs]class TrinoException(Exception):
"""Trino exception."""
def _boolify(value):
if isinstance(value, bool):
return value
if isinstance(value, str):
if value.lower() == "false":
return False
elif value.lower() == "true":
return True
return value
[docs]class TrinoHook(DbApiHook):
"""
Interact with Trino through trino package.
>>> ph = TrinoHook()
>>> sql = "SELECT count(1) AS num FROM airflow.static_babynames"
>>> ph.get_records(sql)
[[340698]]
"""
[docs] conn_name_attr = "trino_conn_id"
[docs] default_conn_name = "trino_default"
_test_connection_sql = "select 1"
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self._placeholder: str = "?"
[docs] def get_conn(self) -> Connection:
"""Return a connection object."""
db = self.get_connection(self.trino_conn_id) # type: ignore[attr-defined]
extra = db.extra_dejson
auth = None
user = db.login
if db.password and extra.get("auth") in ("kerberos", "certs"):
raise AirflowException(f"The {extra.get('auth')!r} authorization type doesn't support password.")
elif db.password:
auth = trino.auth.BasicAuthentication(db.login, db.password) # type: ignore[attr-defined]
elif extra.get("auth") == "jwt":
if not exactly_one(jwt_file := "jwt__file" in extra, jwt_token := "jwt__token" in extra):
msg = (
"When auth set to 'jwt' then expected exactly one parameter 'jwt__file' or 'jwt__token'"
" in connection extra, but "
)
if jwt_file and jwt_token:
msg += "provided both."
else:
msg += "none of them provided."
raise ValueError(msg)
elif jwt_file:
token = Path(extra["jwt__file"]).read_text()
else:
token = extra["jwt__token"]
auth = trino.auth.JWTAuthentication(token=token)
elif extra.get("auth") == "certs":
auth = trino.auth.CertificateAuthentication(
extra.get("certs__client_cert_path"),
extra.get("certs__client_key_path"),
)
elif extra.get("auth") == "kerberos":
auth = trino.auth.KerberosAuthentication( # type: ignore[attr-defined]
config=extra.get("kerberos__config", os.environ.get("KRB5_CONFIG")),
service_name=extra.get("kerberos__service_name"),
mutual_authentication=_boolify(extra.get("kerberos__mutual_authentication", False)),
force_preemptive=_boolify(extra.get("kerberos__force_preemptive", False)),
hostname_override=extra.get("kerberos__hostname_override"),
sanitize_mutual_error_response=_boolify(
extra.get("kerberos__sanitize_mutual_error_response", True)
),
principal=extra.get("kerberos__principal", conf.get("kerberos", "principal")),
delegate=_boolify(extra.get("kerberos__delegate", False)),
ca_bundle=extra.get("kerberos__ca_bundle"),
)
if _boolify(extra.get("impersonate_as_owner", False)):
user = os.getenv("AIRFLOW_CTX_DAG_OWNER", None)
if user is None:
user = db.login
http_headers = {"X-Trino-Client-Info": generate_trino_client_info()}
trino_conn = trino.dbapi.connect(
host=db.host,
port=db.port,
user=user,
source=extra.get("source", "airflow"),
http_scheme=extra.get("protocol", "http"),
http_headers=http_headers,
catalog=extra.get("catalog", "hive"),
schema=db.schema,
auth=auth,
# type: ignore[func-returns-value]
isolation_level=self.get_isolation_level(),
verify=_boolify(extra.get("verify", True)),
session_properties=extra.get("session_properties") or None,
client_tags=extra.get("client_tags") or None,
timezone=extra.get("timezone") or None,
)
return trino_conn
[docs] def get_isolation_level(self) -> Any:
"""Return an isolation level."""
db = self.get_connection(self.trino_conn_id) # type: ignore[attr-defined]
isolation_level = db.extra_dejson.get("isolation_level", "AUTOCOMMIT").upper()
return getattr(IsolationLevel, isolation_level, IsolationLevel.AUTOCOMMIT)
[docs] def get_records(
self,
sql: str | list[str] = "",
parameters: Iterable | Mapping[str, Any] | None = None,
) -> Any:
if not isinstance(sql, str):
raise ValueError(f"The sql in Trino Hook must be a string and is {sql}!")
try:
return super().get_records(self.strip_sql_string(sql), parameters)
except DatabaseError as e:
raise TrinoException(e)
[docs] def get_first(
self, sql: str | list[str] = "", parameters: Iterable | Mapping[str, Any] | None = None
) -> Any:
if not isinstance(sql, str):
raise ValueError(f"The sql in Trino Hook must be a string and is {sql}!")
try:
return super().get_first(self.strip_sql_string(sql), parameters)
except DatabaseError as e:
raise TrinoException(e)
[docs] def get_pandas_df(self, sql: str = "", parameters: Iterable | Mapping[str, Any] | None = None, **kwargs): # type: ignore[override]
import pandas as pd
cursor = self.get_cursor()
try:
cursor.execute(self.strip_sql_string(sql), parameters)
data = cursor.fetchall()
except DatabaseError as e:
raise TrinoException(e)
column_descriptions = cursor.description
if data:
df = pd.DataFrame(data, **kwargs)
df.rename(columns={n: c[0] for n, c in zip(df.columns, column_descriptions)}, inplace=True)
else:
df = pd.DataFrame(**kwargs)
return df
[docs] def insert_rows(
self,
table: str,
rows: Iterable[tuple],
target_fields: Iterable[str] | None = None,
commit_every: int = 0,
replace: bool = False,
**kwargs,
) -> None:
"""
Insert a set of tuples into a table in a generic way.
:param table: Name of the target table
:param rows: The rows to insert into the table
:param target_fields: The names of the columns to fill in the table
:param commit_every: The maximum number of rows to insert in one
transaction. Set to 0 to insert all rows in one transaction.
:param replace: Whether to replace instead of insert
"""
if self.get_isolation_level() == IsolationLevel.AUTOCOMMIT:
self.log.info(
"Transactions are not enable in trino connection. "
"Please use the isolation_level property to enable it. "
"Falling back to insert all rows in one transaction."
)
commit_every = 0
super().insert_rows(table, rows, target_fields, commit_every, replace)
@staticmethod
def _serialize_cell(cell: Any, conn: Connection | None = None) -> Any:
"""
Trino will adapt all execute() args internally, hence we return cell without any conversion.
:param cell: The cell to insert into the table
:param conn: The database connection
:return: The cell
"""
return cell
[docs] def get_openlineage_database_info(self, connection):
"""Return Trino specific information for OpenLineage."""
from airflow.providers.openlineage.sqlparser import DatabaseInfo
return DatabaseInfo(
scheme="trino",
authority=DbApiHook.get_openlineage_authority_part(
connection, default_port=trino.constants.DEFAULT_PORT
),
information_schema_columns=[
"table_schema",
"table_name",
"column_name",
"ordinal_position",
"data_type",
"table_catalog",
],
database=connection.extra_dejson.get("catalog", "hive"),
is_information_schema_cross_db=True,
)
[docs] def get_openlineage_database_dialect(self, _):
"""Return Trino dialect."""
return "trino"
[docs] def get_openlineage_default_schema(self):
"""Return Trino default schema."""
return trino.constants.DEFAULT_SCHEMA
