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repair.py
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repair.py
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"""Repair data on subscriber.
Walks tables by primary key and searcher
missing inserts/updates/deletes.
"""
import sys, os, time, skytools
from syncer import Syncer
__all__ = ['Repairer']
def unescape(s):
return skytools.unescape_copy(s)
def get_pkey_list(curs, tbl):
"""Get list of pkey fields in right order."""
oid = skytools.get_table_oid(curs, tbl)
q = """SELECT k.attname FROM pg_index i, pg_attribute k
WHERE i.indrelid = %s AND k.attrelid = i.indexrelid
AND i.indisprimary AND k.attnum > 0 AND NOT k.attisdropped
ORDER BY k.attnum"""
curs.execute(q, [oid])
list = []
for row in curs.fetchall():
list.append(row[0])
return list
def get_column_list(curs, tbl):
"""Get list of columns in right order."""
oid = skytools.get_table_oid(curs, tbl)
q = """SELECT a.attname FROM pg_attribute a
WHERE a.attrelid = %s
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum"""
curs.execute(q, [oid])
list = []
for row in curs.fetchall():
list.append(row[0])
return list
class Repairer(Syncer):
"""Walks tables in primary key order and checks if data matches."""
def process_sync(self, tbl, src_db, dst_db):
"""Actual comparision."""
src_curs = src_db.cursor()
dst_curs = dst_db.cursor()
self.log.info('Checking %s' % tbl)
self.common_fields = []
self.pkey_list = []
copy_tbl = self.gen_copy_tbl(tbl, src_curs, dst_curs)
dump_src = tbl + ".src"
dump_dst = tbl + ".dst"
self.log.info("Dumping src table: %s" % tbl)
self.dump_table(tbl, copy_tbl, src_curs, dump_src)
src_db.commit()
self.log.info("Dumping dst table: %s" % tbl)
self.dump_table(tbl, copy_tbl, dst_curs, dump_dst)
dst_db.commit()
self.log.info("Sorting src table: %s" % tbl)
s_in, s_out = os.popen4("sort --version")
s_ver = s_out.read()
del s_in, s_out
if s_ver.find("coreutils") > 0:
args = "-S 30%"
else:
args = ""
os.system("sort %s -T . -o %s.sorted %s" % (args, dump_src, dump_src))
self.log.info("Sorting dst table: %s" % tbl)
os.system("sort %s -T . -o %s.sorted %s" % (args, dump_dst, dump_dst))
self.dump_compare(tbl, dump_src + ".sorted", dump_dst + ".sorted")
os.unlink(dump_src)
os.unlink(dump_dst)
os.unlink(dump_src + ".sorted")
os.unlink(dump_dst + ".sorted")
def gen_copy_tbl(self, tbl, src_curs, dst_curs):
self.pkey_list = get_pkey_list(src_curs, tbl)
dst_pkey = get_pkey_list(dst_curs, tbl)
if dst_pkey != self.pkey_list:
self.log.error('pkeys do not match')
sys.exit(1)
src_cols = get_column_list(src_curs, tbl)
dst_cols = get_column_list(dst_curs, tbl)
field_list = []
for f in self.pkey_list:
field_list.append(f)
for f in src_cols:
if f in self.pkey_list:
continue
if f in dst_cols:
field_list.append(f)
self.common_fields = field_list
fqlist = [skytools.quote_ident(col) for col in field_list]
tbl_expr = "%s (%s)" % (skytools.quote_fqident(tbl), ",".join(fqlist))
self.log.debug("using copy expr: %s" % tbl_expr)
return tbl_expr
def dump_table(self, tbl, copy_tbl, curs, fn):
f = open(fn, "w", 64*1024)
curs.copy_to(f, copy_tbl)
size = f.tell()
f.close()
self.log.info('Got %d bytes' % size)
def get_row(self, ln):
if not ln:
return None
t = ln[:-1].split('\t')
row = {}
for i in range(len(self.common_fields)):
row[self.common_fields[i]] = t[i]
return row
def dump_compare(self, tbl, src_fn, dst_fn):
self.log.info("Comparing dumps: %s" % tbl)
self.cnt_insert = 0
self.cnt_update = 0
self.cnt_delete = 0
self.total_src = 0
self.total_dst = 0
f1 = open(src_fn, "r", 64*1024)
f2 = open(dst_fn, "r", 64*1024)
src_ln = f1.readline()
dst_ln = f2.readline()
if src_ln: self.total_src += 1
if dst_ln: self.total_dst += 1
fix = "fix.%s.sql" % tbl
if os.path.isfile(fix):
os.unlink(fix)
while src_ln or dst_ln:
keep_src = keep_dst = 0
if src_ln != dst_ln:
src_row = self.get_row(src_ln)
dst_row = self.get_row(dst_ln)
cmp = self.cmp_keys(src_row, dst_row)
if cmp > 0:
# src > dst
self.got_missed_delete(tbl, dst_row)
keep_src = 1
elif cmp < 0:
# src < dst
self.got_missed_insert(tbl, src_row)
keep_dst = 1
else:
if self.cmp_data(src_row, dst_row) != 0:
self.got_missed_update(tbl, src_row, dst_row)
if not keep_src:
src_ln = f1.readline()
if src_ln: self.total_src += 1
if not keep_dst:
dst_ln = f2.readline()
if dst_ln: self.total_dst += 1
self.log.info("finished %s: src: %d rows, dst: %d rows,"\
" missed: %d inserts, %d updates, %d deletes" % (
tbl, self.total_src, self.total_dst,
self.cnt_insert, self.cnt_update, self.cnt_delete))
def got_missed_insert(self, tbl, src_row):
self.cnt_insert += 1
fld_list = self.common_fields
fq_list = []
val_list = []
for f in fld_list:
fq_list.append(skytools.quote_ident(f))
v = unescape(src_row[f])
val_list.append(skytools.quote_literal(v))
q = "insert into %s (%s) values (%s);" % (
tbl, ", ".join(fq_list), ", ".join(val_list))
self.show_fix(tbl, q, 'insert')
def got_missed_update(self, tbl, src_row, dst_row):
self.cnt_update += 1
fld_list = self.common_fields
set_list = []
whe_list = []
for f in self.pkey_list:
self.addcmp(whe_list, skytools.quote_ident(f), unescape(src_row[f]))
for f in fld_list:
v1 = src_row[f]
v2 = dst_row[f]
if self.cmp_value(v1, v2) == 0:
continue
self.addeq(set_list, skytools.quote_ident(f), unescape(v1))
self.addcmp(whe_list, skytools.quote_ident(f), unescape(v2))
q = "update only %s set %s where %s;" % (
tbl, ", ".join(set_list), " and ".join(whe_list))
self.show_fix(tbl, q, 'update')
def got_missed_delete(self, tbl, dst_row):
self.cnt_delete += 1
whe_list = []
for f in self.pkey_list:
self.addcmp(whe_list, skytools.quote_ident(f), unescape(dst_row[f]))
q = "delete from only %s where %s;" % (skytools.quote_fqident(tbl), " and ".join(whe_list))
self.show_fix(tbl, q, 'delete')
def show_fix(self, tbl, q, desc):
#self.log.warning("missed %s: %s" % (desc, q))
fn = "fix.%s.sql" % tbl
open(fn, "a").write("%s\n" % q)
def addeq(self, list, f, v):
vq = skytools.quote_literal(v)
s = "%s = %s" % (f, vq)
list.append(s)
def addcmp(self, list, f, v):
if v is None:
s = "%s is null" % f
else:
vq = skytools.quote_literal(v)
s = "%s = %s" % (f, vq)
list.append(s)
def cmp_data(self, src_row, dst_row):
for k in self.common_fields:
v1 = src_row[k]
v2 = dst_row[k]
if self.cmp_value(v1, v2) != 0:
return -1
return 0
def cmp_value(self, v1, v2):
if v1 == v2:
return 0
# try to work around tz vs. notz
z1 = len(v1)
z2 = len(v2)
if z1 == z2 + 3 and z2 >= 19 and v1[z2] == '+':
v1 = v1[:-3]
if v1 == v2:
return 0
elif z1 + 3 == z2 and z1 >= 19 and v2[z1] == '+':
v2 = v2[:-3]
if v1 == v2:
return 0
return -1
def cmp_keys(self, src_row, dst_row):
"""Compare primary keys of the rows.
Returns 1 if src > dst, -1 if src < dst and 0 if src == dst"""
# None means table is done. tag it larger than any existing row.
if src_row is None:
if dst_row is None:
return 0
return 1
elif dst_row is None:
return -1
for k in self.pkey_list:
v1 = src_row[k]
v2 = dst_row[k]
if v1 < v2:
return -1
elif v1 > v2:
return 1
return 0