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# This module is part of GitPython and is released under the

# 3-Clause BSD License: https://opensource.org/license/bsd-3-clause/

"""Performance tests for data streaming."""

import gc

import os

import os.path as osp

import subprocess

import sys

from time import time

from gitdb import LooseObjectDB, IStream

from gitdb.test.lib import make_memory_file

from git.util import bin_to_hex

from test.lib import with_rw_repo

from test.performance.lib import TestBigRepoR

class TestObjDBPerformance(TestBigRepoR):

large_data_size_bytes = 1000 * 1000 * 10 # Some MiB should do it.

moderate_data_size_bytes = 1000 * 1000 * 1 # Just 1 MiB.

@with_rw_repo("HEAD", bare=True)

def test_large_data_streaming(self, rwrepo):

# TODO: This part overlaps with the same file in

# gitdb.test.performance.test_stream. It should be shared if possible.

ldb = LooseObjectDB(osp.join(rwrepo.git_dir, "objects"))

for randomize in range(2):

desc = (randomize and "random ") or ""

print("Creating %s data ..." % desc, file=sys.stderr)

st = time()

size, stream = make_memory_file(self.large_data_size_bytes, randomize)

elapsed = time() - st

print("Done (in %f s)" % elapsed, file=sys.stderr)

# Writing - due to the compression it will seem faster than it is.

st = time()

binsha = ldb.store(IStream("blob", size, stream)).binsha

elapsed_add = time() - st

assert ldb.has_object(binsha)

db_file = ldb.readable_db_object_path(bin_to_hex(binsha))

fsize_kib = osp.getsize(db_file) / 1000

size_kib = size / 1000

msg = "Added %i KiB (filesize = %i KiB) of %s data to loose odb in %f s ( %f Write KiB / s)"

msg %= (size_kib, fsize_kib, desc, elapsed_add, size_kib / elapsed_add)

print(msg, file=sys.stderr)

# Reading all at once.

st = time()

ostream = ldb.stream(binsha)

shadata = ostream.read()

elapsed_readall = time() - st

stream.seek(0)

assert shadata == stream.getvalue()

msg = "Read %i KiB of %s data at once from loose odb in %f s ( %f Read KiB / s)"

msg %= (size_kib, desc, elapsed_readall, size_kib / elapsed_readall)

print(msg, file=sys.stderr)

# Reading in chunks of 1 MiB.

cs = 512 * 1000

chunks = []

st = time()

ostream = ldb.stream(binsha)

while True:

data = ostream.read(cs)

chunks.append(data)

if len(data) < cs:

break

# END read in chunks

elapsed_readchunks = time() - st

stream.seek(0)

assert b"".join(chunks) == stream.getvalue()

cs_kib = cs / 1000

print(

"Read %i KiB of %s data in %i KiB chunks from loose odb in %f s ( %f Read KiB / s)"

% (

size_kib,

desc,

cs_kib,

elapsed_readchunks,

size_kib / elapsed_readchunks,

file=sys.stderr,

)

# del db file so git has something to do.

ostream = None

gc.collect()

os.remove(db_file)

# VS. CGIT

##########

# CGIT! Can using the cgit programs be faster?

proc = rwrepo.git.hash_object("-w", "--stdin", as_process=True, istream=subprocess.PIPE)

# Write file - pump everything in at once to be a fast as possible.

data = stream.getvalue() # Cache it.

st = time()

proc.stdin.write(data)

proc.stdin.close()

gitsha = proc.stdout.read().strip()

proc.wait()

gelapsed_add = time() - st

del data

assert gitsha == bin_to_hex(binsha) # We do it the same way, right?

# As it's the same sha, we reuse our path.

fsize_kib = osp.getsize(db_file) / 1000

msg = "Added %i KiB (filesize = %i KiB) of %s data to using git-hash-object in %f s ( %f Write KiB / s)"

msg %= (size_kib, fsize_kib, desc, gelapsed_add, size_kib / gelapsed_add)

print(msg, file=sys.stderr)

# Compare.

print(

"Git-Python is %f %% faster than git when adding big %s files"

% (100.0 - (elapsed_add / gelapsed_add) * 100, desc),

file=sys.stderr,

)

# Read all.

st = time()

_hexsha, _typename, size, data = rwrepo.git.get_object_data(gitsha)

gelapsed_readall = time() - st

print(

"Read %i KiB of %s data at once using git-cat-file in %f s ( %f Read KiB / s)"

% (size_kib, desc, gelapsed_readall, size_kib / gelapsed_readall),

file=sys.stderr,

)

# Compare.

print(

"Git-Python is %f %% faster than git when reading big %sfiles"

% (100.0 - (elapsed_readall / gelapsed_readall) * 100, desc),

file=sys.stderr,

)

# Read chunks.

st = time()

_hexsha, _typename, size, stream = rwrepo.git.stream_object_data(gitsha)

while True:

data = stream.read(cs)

if len(data) < cs:

break

# END read stream

gelapsed_readchunks = time() - st

msg = "Read %i KiB of %s data in %i KiB chunks from git-cat-file in %f s ( %f Read KiB / s)"

msg %= (

size_kib,

desc,

cs_kib,

gelapsed_readchunks,

size_kib / gelapsed_readchunks,

)

print(msg, file=sys.stderr)

# Compare.

print(

"Git-Python is %f %% faster than git when reading big %s files in chunks"

% (100.0 - (elapsed_readchunks / gelapsed_readchunks) * 100, desc),

file=sys.stderr,

)

# END for each randomization factor

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