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diff --git a/swh/storage/common.py b/swh/storage/common.py
--- a/swh/storage/common.py
+++ b/swh/storage/common.py
@@ -3,78 +3,4 @@
# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information
-import inspect
-import functools
-
-
-def apply_options(cursor, options):
- """Applies the given postgresql client options to the given cursor.
-
- Returns a dictionary with the old values if they changed."""
- old_options = {}
- for option, value in options.items():
- cursor.execute('SHOW %s' % option)
- old_value = cursor.fetchall()[0][0]
- if old_value != value:
- cursor.execute('SET LOCAL %s TO %%s' % option, (value,))
- old_options[option] = old_value
- return old_options
-
-
-def db_transaction(**client_options):
- """decorator to execute Storage methods within DB transactions
-
- The decorated method must accept a `cur` and `db` keyword argument
-
- Client options are passed as `set` options to the postgresql server
- """
- def decorator(meth, __client_options=client_options):
- if inspect.isgeneratorfunction(meth):
- raise ValueError(
- 'Use db_transaction_generator for generator functions.')
-
- @functools.wraps(meth)
- def _meth(self, *args, **kwargs):
- if 'cur' in kwargs and kwargs['cur']:
- cur = kwargs['cur']
- old_options = apply_options(cur, __client_options)
- ret = meth(self, *args, **kwargs)
- apply_options(cur, old_options)
- return ret
- else:
- db = self.get_db()
- with db.transaction() as cur:
- apply_options(cur, __client_options)
- return meth(self, *args, db=db, cur=cur, **kwargs)
- return _meth
-
- return decorator
-
-
-def db_transaction_generator(**client_options):
- """decorator to execute Storage methods within DB transactions, while
- returning a generator
-
- The decorated method must accept a `cur` and `db` keyword argument
-
- Client options are passed as `set` options to the postgresql server
- """
- def decorator(meth, __client_options=client_options):
- if not inspect.isgeneratorfunction(meth):
- raise ValueError(
- 'Use db_transaction for non-generator functions.')
-
- @functools.wraps(meth)
- def _meth(self, *args, **kwargs):
- if 'cur' in kwargs and kwargs['cur']:
- cur = kwargs['cur']
- old_options = apply_options(cur, __client_options)
- yield from meth(self, *args, **kwargs)
- apply_options(cur, old_options)
- else:
- db = self.get_db()
- with db.transaction() as cur:
- apply_options(cur, __client_options)
- yield from meth(self, *args, db=db, cur=cur, **kwargs)
- return _meth
- return decorator
+from swh.core.db.common import * # noqa
diff --git a/swh/storage/db.py b/swh/storage/db.py
--- a/swh/storage/db.py
+++ b/swh/storage/db.py
@@ -1,224 +1,13 @@
-# Copyright (C) 2015-2018 The Software Heritage developers
+# Copyright (C) 2015-2019 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information
-import binascii
-import datetime
-import enum
-import functools
-import json
-import os
import select
-import threading
-from contextlib import contextmanager
-
-import psycopg2
-import psycopg2.extras
-
-from .db_utils import execute_values_generator
-
-TMP_CONTENT_TABLE = 'tmp_content'
-
-
-psycopg2.extras.register_uuid()
-
-
-def stored_procedure(stored_proc):
- """decorator to execute remote stored procedure, specified as argument
-
- Generally, the body of the decorated function should be empty. If it is
- not, the stored procedure will be executed first; the function body then.
-
- """
- def wrap(meth):
- @functools.wraps(meth)
- def _meth(self, *args, **kwargs):
- cur = kwargs.get('cur', None)
- self._cursor(cur).execute('SELECT %s()' % stored_proc)
- meth(self, *args, **kwargs)
- return _meth
- return wrap
-
-
-def jsonize(value):
- """Convert a value to a psycopg2 JSON object if necessary"""
- if isinstance(value, dict):
- return psycopg2.extras.Json(value)
-
- return value
-
-
-def entry_to_bytes(entry):
- """Convert an entry coming from the database to bytes"""
- if isinstance(entry, memoryview):
- return entry.tobytes()
- if isinstance(entry, list):
- return [entry_to_bytes(value) for value in entry]
- return entry
-
-
-def line_to_bytes(line):
- """Convert a line coming from the database to bytes"""
- if not line:
- return line
- if isinstance(line, dict):
- return {k: entry_to_bytes(v) for k, v in line.items()}
- return line.__class__(entry_to_bytes(entry) for entry in line)
-
-
-def cursor_to_bytes(cursor):
- """Yield all the data from a cursor as bytes"""
- yield from (line_to_bytes(line) for line in cursor)
-
-
-def execute_values_to_bytes(*args, **kwargs):
- for line in execute_values_generator(*args, **kwargs):
- yield line_to_bytes(line)
-
-
-class BaseDb:
- """Base class for swh.storage.*Db.
-
- cf. swh.storage.db.Db, swh.archiver.db.ArchiverDb
-
- """
-
- @classmethod
- def connect(cls, *args, **kwargs):
- """factory method to create a DB proxy
-
- Accepts all arguments of psycopg2.connect; only some specific
- possibilities are reported below.
-
- Args:
- connstring: libpq2 connection string
-
- """
- conn = psycopg2.connect(*args, **kwargs)
- return cls(conn)
-
- @classmethod
- def from_pool(cls, pool):
- return cls(pool.getconn(), pool=pool)
-
- def _cursor(self, cur_arg):
- """get a cursor: from cur_arg if given, or a fresh one otherwise
-
- meant to avoid boilerplate if/then/else in methods that proxy stored
- procedures
-
- """
- if cur_arg is not None:
- return cur_arg
- # elif self.cur is not None:
- # return self.cur
- else:
- return self.conn.cursor()
-
- def __init__(self, conn, pool=None):
- """create a DB proxy
-
- Args:
- conn: psycopg2 connection to the SWH DB
- pool: psycopg2 pool of connections
-
- """
- self.conn = conn
- self.pool = pool
-
- def __del__(self):
- if self.pool:
- self.pool.putconn(self.conn)
-
- @contextmanager
- def transaction(self):
- """context manager to execute within a DB transaction
-
- Yields:
- a psycopg2 cursor
-
- """
- with self.conn.cursor() as cur:
- try:
- yield cur
- self.conn.commit()
- except Exception:
- if not self.conn.closed:
- self.conn.rollback()
- raise
-
- def copy_to(self, items, tblname, columns, cur=None, item_cb=None):
- """Copy items' entries to table tblname with columns information.
-
- Args:
- items (dict): dictionary of data to copy over tblname
- tblname (str): Destination table's name
- columns ([str]): keys to access data in items and also the
- column names in the destination table.
- item_cb (fn): optional function to apply to items's entry
-
- """
- def escape(data):
- if data is None:
- return ''
- if isinstance(data, bytes):
- return '\\x%s' % binascii.hexlify(data).decode('ascii')
- elif isinstance(data, str):
- return '"%s"' % data.replace('"', '""')
- elif isinstance(data, datetime.datetime):
- # We escape twice to make sure the string generated by
- # isoformat gets escaped
- return escape(data.isoformat())
- elif isinstance(data, dict):
- return escape(json.dumps(data))
- elif isinstance(data, list):
- return escape("{%s}" % ','.join(escape(d) for d in data))
- elif isinstance(data, psycopg2.extras.Range):
- # We escape twice here too, so that we make sure
- # everything gets passed to copy properly
- return escape(
- '%s%s,%s%s' % (
- '[' if data.lower_inc else '(',
- '-infinity' if data.lower_inf else escape(data.lower),
- 'infinity' if data.upper_inf else escape(data.upper),
- ']' if data.upper_inc else ')',
- )
- )
- elif isinstance(data, enum.IntEnum):
- return escape(int(data))
- else:
- # We don't escape here to make sure we pass literals properly
- return str(data)
-
- read_file, write_file = os.pipe()
-
- def writer():
- cursor = self._cursor(cur)
- with open(read_file, 'r') as f:
- cursor.copy_expert('COPY %s (%s) FROM STDIN CSV' % (
- tblname, ', '.join(columns)), f)
-
- write_thread = threading.Thread(target=writer)
- write_thread.start()
-
- try:
- with open(write_file, 'w') as f:
- for d in items:
- if item_cb is not None:
- item_cb(d)
- line = [escape(d.get(k)) for k in columns]
- f.write(','.join(line))
- f.write('\n')
- finally:
- # No problem bubbling up exceptions, but we still need to make sure
- # we finish copying, even though we're probably going to cancel the
- # transaction.
- write_thread.join()
-
- def mktemp(self, tblname, cur=None):
- self._cursor(cur).execute('SELECT swh_mktemp(%s)', (tblname,))
+from swh.core.db.db import * # noqa, bw compat
+from swh.core.db.db import BaseDb, stored_procedure, execute_values_to_bytes
+from swh.core.db.db import cursor_to_bytes, line_to_bytes, jsonize
class Db(BaseDb):
diff --git a/swh/storage/db_utils.py b/swh/storage/db_utils.py
deleted file mode 100644
--- a/swh/storage/db_utils.py
+++ /dev/null
@@ -1,123 +0,0 @@
-# Copyright (C) 2015-2018 The Software Heritage developers
-# See the AUTHORS file at the top-level directory of this distribution
-#
-# This code has been imported from psycopg2, version 2.7.4,
-# https://github.com/psycopg/psycopg2/tree/5afb2ce803debea9533e293eef73c92ffce95bcd
-# and modified by Software Heritage.
-#
-# Original file: lib/extras.py
-#
-# psycopg2 is free software: you can redistribute it and/or modify it under the
-# terms of the GNU Lesser General Public License as published by the Free
-# Software Foundation, either version 3 of the License, or (at your option) any
-# later version.
-
-
-import re
-
-import psycopg2.extensions
-
-
-def _paginate(seq, page_size):
- """Consume an iterable and return it in chunks.
- Every chunk is at most `page_size`. Never return an empty chunk.
- """
- page = []
- it = iter(seq)
- while 1:
- try:
- for i in range(page_size):
- page.append(next(it))
- yield page
- page = []
- except StopIteration:
- if page:
- yield page
- return
-
-
-def _split_sql(sql):
- """Split *sql* on a single ``%s`` placeholder.
- Split on the %s, perform %% replacement and return pre, post lists of
- snippets.
- """
- curr = pre = []
- post = []
- tokens = re.split(br'(%.)', sql)
- for token in tokens:
- if len(token) != 2 or token[:1] != b'%':
- curr.append(token)
- continue
-
- if token[1:] == b's':
- if curr is pre:
- curr = post
- else:
- raise ValueError(
- "the query contains more than one '%s' placeholder")
- elif token[1:] == b'%':
- curr.append(b'%')
- else:
- raise ValueError("unsupported format character: '%s'"
- % token[1:].decode('ascii', 'replace'))
-
- if curr is pre:
- raise ValueError("the query doesn't contain any '%s' placeholder")
-
- return pre, post
-
-
-def execute_values_generator(cur, sql, argslist, template=None, page_size=100):
- '''Execute a statement using SQL ``VALUES`` with a sequence of parameters.
- Rows returned by the query are returned through a generator.
- You need to consume the generator for the queries to be executed!
-
- :param cur: the cursor to use to execute the query.
- :param sql: the query to execute. It must contain a single ``%s``
- placeholder, which will be replaced by a `VALUES list`__.
- Example: ``"INSERT INTO mytable (id, f1, f2) VALUES %s"``.
- :param argslist: sequence of sequences or dictionaries with the arguments
- to send to the query. The type and content must be consistent with
- *template*.
- :param template: the snippet to merge to every item in *argslist* to
- compose the query.
-
- - If the *argslist* items are sequences it should contain positional
- placeholders (e.g. ``"(%s, %s, %s)"``, or ``"(%s, %s, 42)``" if there
- are constants value...).
- - If the *argslist* items are mappings it should contain named
- placeholders (e.g. ``"(%(id)s, %(f1)s, 42)"``).
-
- If not specified, assume the arguments are sequence and use a simple
- positional template (i.e. ``(%s, %s, ...)``), with the number of
- placeholders sniffed by the first element in *argslist*.
- :param page_size: maximum number of *argslist* items to include in every
- statement. If there are more items the function will execute more than
- one statement.
- :param yield_from_cur: Whether to yield results from the cursor in this
- function directly.
-
- .. __: https://www.postgresql.org/docs/current/static/queries-values.html
-
- After the execution of the function the `cursor.rowcount` property will
- **not** contain a total result.
- '''
- # we can't just use sql % vals because vals is bytes: if sql is bytes
- # there will be some decoding error because of stupid codec used, and Py3
- # doesn't implement % on bytes.
- if not isinstance(sql, bytes):
- sql = sql.encode(
- psycopg2.extensions.encodings[cur.connection.encoding]
- )
- pre, post = _split_sql(sql)
-
- for page in _paginate(argslist, page_size=page_size):
- if template is None:
- template = b'(' + b','.join([b'%s'] * len(page[0])) + b')'
- parts = pre[:]
- for args in page:
- parts.append(cur.mogrify(template, args))
- parts.append(b',')
- parts[-1:] = post
- cur.execute(b''.join(parts))
- yield from cur

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