view hgext/infinitepush/sqlindexapi.py @ 43913:4b7d5d10c45d

exchange: ensure all outgoing subrepo references are present before pushing

We've run into occasional problems with people committing a repo, and then
amending or rebasing in the subrepo.  That makes it so that the revision in the
parent can't be checked out, and the problem gets propagated on push.  Mercurial
already tries to defend against this sort of dangling reference by pushing *all*
subrepo revisions first.  This reuses the checks that trigger warnings in
`hg verify` to bail on the push unless using `--force`.

I thought about putting this on the server side, but at that point, all of the
data has been transferred, only to bail out.  Additionally, SCM Manager hosts
subrepos in a location that isn't nested in the parent, so normal subrepo code
would complain that the subrepo is missing when run on the server.

Because the push command pushes subrepos before calling this exchange code, a
subrepo will be pushed before the parent is verified.  Not great, but no
dangling references are exchanged, so it solves the problem.  This code isn't in
the loop that pushes the subrepos because:

  1) the list of outgoing revisions is needed to limit the scope of the check
  2) the loop only accesses the current revision, and therefore can miss
     subrepos that were dropped in previous commits
  3) this code is called when pushing a subrepo, so the protection is recursive

I'm not sure if there's a cheap check for the list of files in the outgoing
bundle.  If there is, that would provide a fast path to bypass this check for
people not using subrepos (or if no subrepo changes were made).  There's
probably also room for verifying other references like tags.  But since that
doesn't break checkouts, it's much less of a problem.

Differential Revision: https://phab.mercurial-scm.org/D7616

# Infinite push
#
# Copyright 2016 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import logging
import os
import time

import warnings
import mysql.connector

from mercurial import pycompat

from . import indexapi


def _convertbookmarkpattern(pattern):
    pattern = pattern.replace(b'_', b'\\_')
    pattern = pattern.replace(b'%', b'\\%')
    if pattern.endswith(b'*'):
        pattern = pattern[:-1] + b'%'
    return pattern


class sqlindexapi(indexapi.indexapi):
    '''
    Sql backend for infinitepush index. See schema.sql
    '''

    def __init__(
        self,
        reponame,
        host,
        port,
        database,
        user,
        password,
        logfile,
        loglevel,
        waittimeout=300,
        locktimeout=120,
    ):
        super(sqlindexapi, self).__init__()
        self.reponame = reponame
        self.sqlargs = {
            b'host': host,
            b'port': port,
            b'database': database,
            b'user': user,
            b'password': password,
        }
        self.sqlconn = None
        self.sqlcursor = None
        if not logfile:
            logfile = os.devnull
        logging.basicConfig(filename=logfile)
        self.log = logging.getLogger()
        self.log.setLevel(loglevel)
        self._connected = False
        self._waittimeout = waittimeout
        self._locktimeout = locktimeout

    def sqlconnect(self):
        if self.sqlconn:
            raise indexapi.indexexception(b"SQL connection already open")
        if self.sqlcursor:
            raise indexapi.indexexception(
                b"SQL cursor already open without connection"
            )
        retry = 3
        while True:
            try:
                self.sqlconn = mysql.connector.connect(**self.sqlargs)

                # Code is copy-pasted from hgsql. Bug fixes need to be
                # back-ported!
                # The default behavior is to return byte arrays, when we
                # need strings. This custom convert returns strings.
                self.sqlconn.set_converter_class(CustomConverter)
                self.sqlconn.autocommit = False
                break
            except mysql.connector.errors.Error:
                # mysql can be flakey occasionally, so do some minimal
                # retrying.
                retry -= 1
                if retry == 0:
                    raise
                time.sleep(0.2)

        waittimeout = self.sqlconn.converter.escape(b'%s' % self._waittimeout)

        self.sqlcursor = self.sqlconn.cursor()
        self.sqlcursor.execute(b"SET wait_timeout=%s" % waittimeout)
        self.sqlcursor.execute(
            b"SET innodb_lock_wait_timeout=%s" % self._locktimeout
        )
        self._connected = True

    def close(self):
        """Cleans up the metadata store connection."""
        with warnings.catch_warnings():
            warnings.simplefilter(b"ignore")
            self.sqlcursor.close()
            self.sqlconn.close()
        self.sqlcursor = None
        self.sqlconn = None

    def __enter__(self):
        if not self._connected:
            self.sqlconnect()
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        if exc_type is None:
            self.sqlconn.commit()
        else:
            self.sqlconn.rollback()

    def addbundle(self, bundleid, nodesctx):
        if not self._connected:
            self.sqlconnect()
        self.log.info(b"ADD BUNDLE %r %r" % (self.reponame, bundleid))
        self.sqlcursor.execute(
            b"INSERT INTO bundles(bundle, reponame) VALUES (%s, %s)",
            params=(bundleid, self.reponame),
        )
        for ctx in nodesctx:
            self.sqlcursor.execute(
                b"INSERT INTO nodestobundle(node, bundle, reponame) "
                b"VALUES (%s, %s, %s) ON DUPLICATE KEY UPDATE "
                b"bundle=VALUES(bundle)",
                params=(ctx.hex(), bundleid, self.reponame),
            )

            extra = ctx.extra()
            author_name = ctx.user()
            committer_name = extra.get(b'committer', ctx.user())
            author_date = int(ctx.date()[0])
            committer_date = int(extra.get(b'committer_date', author_date))
            self.sqlcursor.execute(
                b"INSERT IGNORE INTO nodesmetadata(node, message, p1, p2, "
                b"author, committer, author_date, committer_date, "
                b"reponame) VALUES "
                b"(%s, %s, %s, %s, %s, %s, %s, %s, %s)",
                params=(
                    ctx.hex(),
                    ctx.description(),
                    ctx.p1().hex(),
                    ctx.p2().hex(),
                    author_name,
                    committer_name,
                    author_date,
                    committer_date,
                    self.reponame,
                ),
            )

    def addbookmark(self, bookmark, node):
        """Takes a bookmark name and hash, and records mapping in the metadata
        store."""
        if not self._connected:
            self.sqlconnect()
        self.log.info(
            b"ADD BOOKMARKS %r bookmark: %r node: %r"
            % (self.reponame, bookmark, node)
        )
        self.sqlcursor.execute(
            b"INSERT INTO bookmarkstonode(bookmark, node, reponame) "
            b"VALUES (%s, %s, %s) ON DUPLICATE KEY UPDATE node=VALUES(node)",
            params=(bookmark, node, self.reponame),
        )

    def addmanybookmarks(self, bookmarks):
        if not self._connected:
            self.sqlconnect()
        args = []
        values = []
        for bookmark, node in pycompat.iteritems(bookmarks):
            args.append(b'(%s, %s, %s)')
            values.extend((bookmark, node, self.reponame))
        args = b','.join(args)

        self.sqlcursor.execute(
            b"INSERT INTO bookmarkstonode(bookmark, node, reponame) "
            b"VALUES %s ON DUPLICATE KEY UPDATE node=VALUES(node)" % args,
            params=values,
        )

    def deletebookmarks(self, patterns):
        """Accepts list of bookmark patterns and deletes them.
        If `commit` is set then bookmark will actually be deleted. Otherwise
        deletion will be delayed until the end of transaction.
        """
        if not self._connected:
            self.sqlconnect()
        self.log.info(b"DELETE BOOKMARKS: %s" % patterns)
        for pattern in patterns:
            pattern = _convertbookmarkpattern(pattern)
            self.sqlcursor.execute(
                b"DELETE from bookmarkstonode WHERE bookmark LIKE (%s) "
                b"and reponame = %s",
                params=(pattern, self.reponame),
            )

    def getbundle(self, node):
        """Returns the bundleid for the bundle that contains the given node."""
        if not self._connected:
            self.sqlconnect()
        self.log.info(b"GET BUNDLE %r %r" % (self.reponame, node))
        self.sqlcursor.execute(
            b"SELECT bundle from nodestobundle "
            b"WHERE node = %s AND reponame = %s",
            params=(node, self.reponame),
        )
        result = self.sqlcursor.fetchall()
        if len(result) != 1 or len(result[0]) != 1:
            self.log.info(b"No matching node")
            return None
        bundle = result[0][0]
        self.log.info(b"Found bundle %r" % bundle)
        return bundle

    def getnode(self, bookmark):
        """Returns the node for the given bookmark. None if it doesn't exist."""
        if not self._connected:
            self.sqlconnect()
        self.log.info(
            b"GET NODE reponame: %r bookmark: %r" % (self.reponame, bookmark)
        )
        self.sqlcursor.execute(
            b"SELECT node from bookmarkstonode WHERE "
            b"bookmark = %s AND reponame = %s",
            params=(bookmark, self.reponame),
        )
        result = self.sqlcursor.fetchall()
        if len(result) != 1 or len(result[0]) != 1:
            self.log.info(b"No matching bookmark")
            return None
        node = result[0][0]
        self.log.info(b"Found node %r" % node)
        return node

    def getbookmarks(self, query):
        if not self._connected:
            self.sqlconnect()
        self.log.info(
            b"QUERY BOOKMARKS reponame: %r query: %r" % (self.reponame, query)
        )
        query = _convertbookmarkpattern(query)
        self.sqlcursor.execute(
            b"SELECT bookmark, node from bookmarkstonode WHERE "
            b"reponame = %s AND bookmark LIKE %s",
            params=(self.reponame, query),
        )
        result = self.sqlcursor.fetchall()
        bookmarks = {}
        for row in result:
            if len(row) != 2:
                self.log.info(b"Bad row returned: %s" % row)
                continue
            bookmarks[row[0]] = row[1]
        return bookmarks

    def saveoptionaljsonmetadata(self, node, jsonmetadata):
        if not self._connected:
            self.sqlconnect()
        self.log.info(
            (
                b"INSERT METADATA, QUERY BOOKMARKS reponame: %r "
                + b"node: %r, jsonmetadata: %s"
            )
            % (self.reponame, node, jsonmetadata)
        )

        self.sqlcursor.execute(
            b"UPDATE nodesmetadata SET optional_json_metadata=%s WHERE "
            b"reponame=%s AND node=%s",
            params=(jsonmetadata, self.reponame, node),
        )


class CustomConverter(mysql.connector.conversion.MySQLConverter):
    """Ensure that all values being returned are returned as python string
    (versus the default byte arrays)."""

    def _STRING_to_python(self, value, dsc=None):
        return str(value)

    def _VAR_STRING_to_python(self, value, dsc=None):
        return str(value)

    def _BLOB_to_python(self, value, dsc=None):
        return str(value)