# 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 . import indexapi

def _convertbookmarkpattern(pattern):

    pattern = pattern.replace('_', '\\_')

    pattern = pattern.replace('%', '\\%')

    if pattern.endswith('*'):

        pattern = pattern[:-1] + '%'

    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 = {

            'host': host,

            'port': port,

            'database': database,

            'user': user,

            '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("SQL connection already open")

        if self.sqlcursor:

            raise indexapi.indexexception("SQL cursor already open without"

                                          " connection")

        retry = 3

        while True:

            try:

                # 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('%s' % self._waittimeout)

        self.sqlcursor = self.sqlconn.cursor()

        self.sqlcursor.execute("SET wait_timeout=%s" % waittimeout)

        self.sqlcursor.execute("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("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("ADD BUNDLE %r %r" % (self.reponame, bundleid))

        self.sqlcursor.execute(

            "INSERT INTO bundles(bundle, reponame) VALUES "

            "(%s, %s)", params=(bundleid, self.reponame))

        for ctx in nodesctx:

            self.sqlcursor.execute(

                "INSERT INTO nodestobundle(node, bundle, reponame) "

                "VALUES (%s, %s, %s) ON DUPLICATE KEY UPDATE "

                "bundle=VALUES(bundle)",

                params=(ctx.hex(), bundleid, self.reponame))

            extra = ctx.extra()

            author_name = ctx.user()

            committer_name = extra.get('committer', ctx.user())

            author_date = int(ctx.date()[0])

            committer_date = int(extra.get('committer_date', author_date))

            self.sqlcursor.execute(

                "INSERT IGNORE INTO nodesmetadata(node, message, p1, p2, "

                "author, committer, author_date, committer_date, "

                "reponame) VALUES "

                "(%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(

            "ADD BOOKMARKS %r bookmark: %r node: %r" %

            (self.reponame, bookmark, node))

        self.sqlcursor.execute(

            "INSERT INTO bookmarkstonode(bookmark, node, reponame) "

            "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 bookmarks.iteritems():

            args.append('(%s, %s, %s)')

            values.extend((bookmark, node, self.reponame))

        args = ','.join(args)

        self.sqlcursor.execute(

            "INSERT INTO bookmarkstonode(bookmark, node, reponame) "

            "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("DELETE BOOKMARKS: %s" % patterns)

        for pattern in patterns:

            pattern = _convertbookmarkpattern(pattern)

            self.sqlcursor.execute(

                "DELETE from bookmarkstonode WHERE bookmark LIKE (%s) "

                "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("GET BUNDLE %r %r" % (self.reponame, node))

        self.sqlcursor.execute(

            "SELECT bundle from nodestobundle "

            "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("No matching node")

            return None

        bundle = result[0][0]

        self.log.info("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(

            "GET NODE reponame: %r bookmark: %r" % (self.reponame, bookmark))

        self.sqlcursor.execute(

            "SELECT node from bookmarkstonode WHERE "

            "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("No matching bookmark")

            return None

        node = result[0][0]

        self.log.info("Found node %r" % node)

        return node

    def getbookmarks(self, query):

        if not self._connected:

            self.sqlconnect()

        self.log.info(

            "QUERY BOOKMARKS reponame: %r query: %r" % (self.reponame, query))

        query = _convertbookmarkpattern(query)

        self.sqlcursor.execute(

            "SELECT bookmark, node from bookmarkstonode WHERE "

            "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("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(

            ("INSERT METADATA, QUERY BOOKMARKS reponame: %r " +

             "node: %r, jsonmetadata: %s") %

            (self.reponame, node, jsonmetadata))

        self.sqlcursor.execute(

            "UPDATE nodesmetadata SET optional_json_metadata=%s WHERE "

            "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)