# 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):

    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 = {

        }

        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:

        if self.sqlcursor:

            raise indexapi.indexexception(

            )

        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)

        self.sqlcursor = self.sqlconn.cursor()

        self.sqlcursor.execute(

        )

        self._connected = True

    def close(self):

        """Cleans up the metadata store connection."""

        with warnings.catch_warnings():

            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.sqlcursor.execute(

            params=(bundleid, self.reponame),

        )

        for ctx in nodesctx:

            self.sqlcursor.execute(

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

            )

            extra = ctx.extra()

            author_name = ctx.user()

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

            self.sqlcursor.execute(

                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(

            % (self.reponame, bookmark, node)

        )

        self.sqlcursor.execute(

            params=(bookmark, node, self.reponame),

        )

    def addmanybookmarks(self, bookmarks):

        if not self._connected:

            self.sqlconnect()

        args = []

        values = []

        for bookmark, node in bookmarks.iteritems():

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

        self.sqlcursor.execute(

            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()

        for pattern in patterns:

            pattern = _convertbookmarkpattern(pattern)

            self.sqlcursor.execute(

                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.sqlcursor.execute(

            params=(node, self.reponame),

        )

        result = self.sqlcursor.fetchall()

        if len(result) != 1 or len(result[0]) != 1:

            return None

        bundle = result[0][0]

        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(

        )

        self.sqlcursor.execute(

            params=(bookmark, self.reponame),

        )

        result = self.sqlcursor.fetchall()

        if len(result) != 1 or len(result[0]) != 1:

            return None

        node = result[0][0]

        return node

    def getbookmarks(self, query):

        if not self._connected:

            self.sqlconnect()

        self.log.info(

        )

        query = _convertbookmarkpattern(query)

        self.sqlcursor.execute(

            params=(self.reponame, query),

        )

        result = self.sqlcursor.fetchall()

        bookmarks = {}

        for row in result:

            if len(row) != 2:

                continue

            bookmarks[row[0]] = row[1]

        return bookmarks

    def saveoptionaljsonmetadata(self, node, jsonmetadata):

        if not self._connected:

            self.sqlconnect()

        self.log.info(

            (

            )

            % (self.reponame, node, jsonmetadata)

        )

        self.sqlcursor.execute(

            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)