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092a9b74d3
Newer version of mypy fixes buggy error when trying to update only boto3 stubs. However it brings new checks and starts to yell when we index into cusror.fetchone without checking for None first. So this introduces a wrapper to simplify quering for scalar values. I tried to use cursor_factory connection argument but without success. There can be a better way to do that, but this looks the simplest
191 lines
7.6 KiB
Python
191 lines
7.6 KiB
Python
from contextlib import closing
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from fixtures.neon_fixtures import NeonEnv
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from fixtures.log_helper import log
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from psycopg2.errors import UndefinedTable
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from psycopg2.errors import IoError
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from fixtures.utils import query_scalar
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pytest_plugins = ("fixtures.neon_fixtures")
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extensions = ["pageinspect", "neon_test_utils", "pg_buffercache"]
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#
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# Validation of reading different page versions
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#
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def test_read_validation(neon_simple_env: NeonEnv):
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env = neon_simple_env
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env.neon_cli.create_branch("test_read_validation", "empty")
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pg = env.postgres.create_start("test_read_validation")
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log.info("postgres is running on 'test_read_validation' branch")
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with closing(pg.connect()) as con:
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with con.cursor() as c:
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for e in extensions:
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c.execute("create extension if not exists {};".format(e))
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c.execute("create table foo (c int) with (autovacuum_enabled = false)")
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c.execute("insert into foo values (1)")
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c.execute("select lsn, lower, upper from page_header(get_raw_page('foo', 'main', 0));")
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first = c.fetchone()
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assert first is not None
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relfilenode = query_scalar(c, "select relfilenode from pg_class where relname = 'foo'")
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c.execute("insert into foo values (2);")
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c.execute("select lsn, lower, upper from page_header(get_raw_page('foo', 'main', 0));")
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second = c.fetchone()
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assert first != second, "Failed to update page"
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log.info("Test table is populated, validating buffer cache")
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cache_entries = query_scalar(
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c,
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"select count(*) from pg_buffercache where relfilenode = {}".format(relfilenode))
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assert cache_entries > 0, "No buffers cached for the test relation"
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c.execute(
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"select reltablespace, reldatabase, relfilenode from pg_buffercache where relfilenode = {}"
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.format(relfilenode))
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reln = c.fetchone()
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assert reln is not None
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log.info("Clear buffer cache to ensure no stale pages are brought into the cache")
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c.execute("select clear_buffer_cache()")
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cache_entries = query_scalar(
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c,
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"select count(*) from pg_buffercache where relfilenode = {}".format(relfilenode))
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assert cache_entries == 0, "Failed to clear buffer cache"
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log.info("Cache is clear, reading stale page version")
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c.execute(
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"select lsn, lower, upper from page_header(get_raw_page_at_lsn('foo', 'main', 0, '{}'))"
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.format(first[0]))
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direct_first = c.fetchone()
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assert first == direct_first, "Failed fetch page at historic lsn"
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cache_entries = query_scalar(
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c,
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"select count(*) from pg_buffercache where relfilenode = {}".format(relfilenode))
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assert cache_entries == 0, "relation buffers detected after invalidation"
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log.info("Cache is clear, reading latest page version without cache")
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c.execute(
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"select lsn, lower, upper from page_header(get_raw_page_at_lsn('foo', 'main', 0, NULL))"
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)
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direct_latest = c.fetchone()
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assert second == direct_latest, "Failed fetch page at latest lsn"
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cache_entries = query_scalar(
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c,
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"select count(*) from pg_buffercache where relfilenode = {}".format(relfilenode))
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assert cache_entries == 0, "relation buffers detected after invalidation"
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log.info(
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"Cache is clear, reading stale page version without cache using relation identifiers"
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)
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c.execute(
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"select lsn, lower, upper from page_header(get_raw_page_at_lsn( {}, {}, {}, 0, 0, '{}' ))"
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.format(reln[0], reln[1], reln[2], first[0]))
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direct_first = c.fetchone()
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assert first == direct_first, "Failed fetch page at historic lsn using oid"
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log.info(
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"Cache is clear, reading latest page version without cache using relation identifiers"
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)
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c.execute(
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"select lsn, lower, upper from page_header(get_raw_page_at_lsn( {}, {}, {}, 0, 0, NULL ))"
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.format(reln[0], reln[1], reln[2]))
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direct_latest = c.fetchone()
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assert second == direct_latest, "Failed fetch page at latest lsn"
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c.execute('drop table foo;')
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log.info(
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"Relation dropped, attempting reading stale page version without cache using relation identifiers"
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)
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c.execute(
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"select lsn, lower, upper from page_header(get_raw_page_at_lsn( {}, {}, {}, 0, 0, '{}' ))"
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.format(reln[0], reln[1], reln[2], first[0]))
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direct_first = c.fetchone()
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assert first == direct_first, "Failed fetch page at historic lsn using oid"
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log.info("Validation page inspect won't allow reading pages of dropped relations")
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try:
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c.execute("select * from page_header(get_raw_page('foo', 'main', 0));")
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assert False, "query should have failed"
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except UndefinedTable as e:
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log.info("Caught an expected failure: {}".format(e))
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def test_read_validation_neg(neon_simple_env: NeonEnv):
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env = neon_simple_env
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env.neon_cli.create_branch("test_read_validation_neg", "empty")
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pg = env.postgres.create_start("test_read_validation_neg")
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log.info("postgres is running on 'test_read_validation_neg' branch")
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with closing(pg.connect()) as con:
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with con.cursor() as c:
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for e in extensions:
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c.execute("create extension if not exists {};".format(e))
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log.info("read a page of a missing relation")
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try:
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c.execute(
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"select lsn, lower, upper from page_header(get_raw_page_at_lsn('Unknown', 'main', 0, '0/0'))"
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)
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assert False, "query should have failed"
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except UndefinedTable as e:
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log.info("Caught an expected failure: {}".format(e))
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c.execute("create table foo (c int) with (autovacuum_enabled = false)")
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c.execute("insert into foo values (1)")
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log.info("read a page at lsn 0")
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try:
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c.execute(
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"select lsn, lower, upper from page_header(get_raw_page_at_lsn('foo', 'main', 0, '0/0'))"
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)
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assert False, "query should have failed"
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except IoError as e:
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log.info("Caught an expected failure: {}".format(e))
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log.info("Pass NULL as an input")
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expected = (None, None, None)
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c.execute(
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"select lsn, lower, upper from page_header(get_raw_page_at_lsn(NULL, 'main', 0, '0/0'))"
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)
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assert c.fetchone() == expected, "Expected null output"
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c.execute(
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"select lsn, lower, upper from page_header(get_raw_page_at_lsn('foo', NULL, 0, '0/0'))"
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)
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assert c.fetchone() == expected, "Expected null output"
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c.execute(
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"select lsn, lower, upper from page_header(get_raw_page_at_lsn('foo', 'main', NULL, '0/0'))"
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)
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assert c.fetchone() == expected, "Expected null output"
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# This check is currently failing, reading beyond EOF is returning a 0-page
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log.info("Read beyond EOF")
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c.execute(
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"select lsn, lower, upper from page_header(get_raw_page_at_lsn('foo', 'main', 1, NULL))"
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)
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