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annotate rust/hg-core/src/revlog/revlog.rs @ 45907:06b64fabf91c

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copies: cache the ancestor checking call when tracing copy A good share of the time spent in this function is spent doing ancestors checking. To avoid spending time in duplicated call, we cache the result of calls. In the slower case, this provide a quite significant performance boost. Below are the result for a set of selected pairs (many of them pathological): (And further down is another table that summarize the current state of filelog based vs changeset base copy tracing) The benchmark have been configured to be killed after 6 minutes of runtime, which mean that any detect slower than 2 minutes will be marked as "killed". This drop some useful information about how much slower these case are? but also prevent 99% of the benchmark time to be spent on case that can be labelled "very slow" anyway. Repo Case Source-Rev Dest-Rev Old-Time New-Time Difference Factor ------------------------------------------------------------------------------------------------------------------------------------ mercurial x_revs_x_added_0_copies ad6b123de1c7 39cfcef4f463 : 0.000044 s, 0.000044 s, +0.000000 s, ? 1.0000 mercurial x_revs_x_added_x_copies 2b1c78674230 0c1d10351869 : 0.000138 s, 0.000138 s, +0.000000 s, ? 1.0000 mercurial x000_revs_x000_added_x_copies 81f8ff2a9bf2 dd3267698d84 : 0.005067 s, 0.005052 s, -0.000015 s, ? 0.9970 pypy x_revs_x_added_0_copies aed021ee8ae8 099ed31b181b : 0.000218 s, 0.000219 s, +0.000001 s, ? 1.0046 pypy x_revs_x000_added_0_copies 4aa4e1f8e19a 359343b9ac0e : 0.000053 s, 0.000055 s, +0.000002 s, ? 1.0377 pypy x_revs_x_added_x_copies ac52eb7bbbb0 72e022663155 : 0.000125 s, 0.000128 s, +0.000003 s, ? 1.0240 pypy x_revs_x00_added_x_copies c3b14617fbd7 ace7255d9a26 : 0.001098 s, 0.001089 s, -0.000009 s, ? 0.9918 pypy x_revs_x000_added_x000_copies df6f7a526b60 a83dc6a2d56f : 0.017546 s, 0.017407 s, -0.000139 s, ? 0.9921 pypy x000_revs_xx00_added_0_copies 89a76aede314 2f22446ff07e : 0.096723 s, 0.094175 s, -0.002548 s, ? 0.9737 pypy x000_revs_x000_added_x_copies 8a3b5bfd266e 2c68e87c3efe : 0.271796 s, 0.238009 s, -0.033787 s, ? 0.8757 pypy x000_revs_x000_added_x000_copies 89a76aede314 7b3dda341c84 : 0.128602 s, 0.125876 s, -0.002726 s, ? 0.9788 pypy x0000_revs_x_added_0_copies d1defd0dc478 c9cb1334cc78 : 7.086742 s, 3.581556 s, -3.505186 s, ? 0.5054 pypy x0000_revs_xx000_added_0_copies bf2c629d0071 4ffed77c095c : 0.016634 s, 0.016721 s, +0.000087 s, ? 1.0052 pypy x0000_revs_xx000_added_x000_copies 08ea3258278e d9fa043f30c0 : 0.254225 s, 0.242367 s, -0.011858 s, ? 0.9534 netbeans x_revs_x_added_0_copies fb0955ffcbcd a01e9239f9e7 : 0.000166 s, 0.000165 s, -0.000001 s, ? 0.9940 netbeans x_revs_x000_added_0_copies 6f360122949f 20eb231cc7d0 : 0.000118 s, 0.000114 s, -0.000004 s, ? 0.9661 netbeans x_revs_x_added_x_copies 1ada3faf6fb6 5a39d12eecf4 : 0.000296 s, 0.000296 s, +0.000000 s, ? 1.0000 netbeans x_revs_x00_added_x_copies 35be93ba1e2c 9eec5e90c05f : 0.001137 s, 0.001124 s, -0.000013 s, ? 0.9886 netbeans x000_revs_xx00_added_0_copies eac3045b4fdd 51d4ae7f1290 : 0.014133 s, 0.013060 s, -0.001073 s, ? 0.9241 netbeans x000_revs_x000_added_x_copies e2063d266acd 6081d72689dc : 0.016988 s, 0.017112 s, +0.000124 s, ? 1.0073 netbeans x000_revs_x000_added_x000_copies ff453e9fee32 411350406ec2 : 0.676361 s, 0.660350 s, -0.016011 s, ? 0.9763 netbeans x0000_revs_xx000_added_x000_copies 588c2d1ced70 1aad62e59ddd : 12.515149 s, 10.032499 s, -2.482650 s, ? 0.8016 mozilla-central x_revs_x_added_0_copies 3697f962bb7b 7015fcdd43a2 : 0.000186 s, 0.000189 s, +0.000003 s, ? 1.0161 mozilla-central x_revs_x000_added_0_copies dd390860c6c9 40d0c5bed75d : 0.000459 s, 0.000462 s, +0.000003 s, ? 1.0065 mozilla-central x_revs_x_added_x_copies 8d198483ae3b 14207ffc2b2f : 0.000273 s, 0.000270 s, -0.000003 s, ? 0.9890 mozilla-central x_revs_x00_added_x_copies 98cbc58cc6bc 446a150332c3 : 0.001503 s, 0.001474 s, -0.000029 s, ? 0.9807 mozilla-central x_revs_x000_added_x000_copies 3c684b4b8f68 0a5e72d1b479 : 0.004862 s, 0.004806 s, -0.000056 s, ? 0.9885 mozilla-central x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 0.088291 s, 0.085150 s, -0.003141 s, ? 0.9644 mozilla-central x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.007113 s, 0.007064 s, -0.000049 s, ? 0.9931 mozilla-central x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.004687 s, 0.004741 s, +0.000054 s, ? 1.0115 mozilla-central x000_revs_x000_added_x000_copies 7c97034feb78 4407bd0c6330 : 0.198710 s, 0.190133 s, -0.008577 s, ? 0.9568 mozilla-central x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 0.036068 s, 0.035651 s, -0.000417 s, ? 0.9884 mozilla-central x0000_revs_xx000_added_x000_copies f78c615a656c 96a38b690156 : 0.465362 s, 0.440694 s, -0.024668 s, ? 0.9470 mozilla-central x00000_revs_x0000_added_x0000_copies 6832ae71433c 4c222a1d9a00 : 24.519684 s, 18.454163 s, -6.065521 s, ? 0.7526 mozilla-central x00000_revs_x00000_added_x000_copies 76caed42cf7c 1daa622bbe42 : 42.711897 s, 31.562719 s, -11.149178 s, ? 0.7390 mozilla-try x_revs_x_added_0_copies aaf6dde0deb8 9790f499805a : 0.001201 s, 0.001189 s, -0.000012 s, ? 0.9900 mozilla-try x_revs_x000_added_0_copies d8d0222927b4 5bb8ce8c7450 : 0.001216 s, 0.001204 s, -0.000012 s, ? 0.9901 mozilla-try x_revs_x_added_x_copies 092fcca11bdb 936255a0384a : 0.000595 s, 0.000586 s, -0.000009 s, ? 0.9849 mozilla-try x_revs_x00_added_x_copies b53d2fadbdb5 017afae788ec : 0.001856 s, 0.001845 s, -0.000011 s, ? 0.9941 mozilla-try x_revs_x000_added_x000_copies 20408ad61ce5 6f0ee96e21ad : 0.064936 s, 0.063822 s, -0.001114 s, ? 0.9828 mozilla-try x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 0.090601 s, 0.088038 s, -0.002563 s, ? 0.9717 mozilla-try x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.007510 s, 0.007389 s, -0.000121 s, ? 0.9839 mozilla-try x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.004911 s, 0.004868 s, -0.000043 s, ? 0.9912 mozilla-try x000_revs_x000_added_x000_copies 1346fd0130e4 4c65cbdabc1f : 0.233231 s, 0.222450 s, -0.010781 s, ? 0.9538 mozilla-try x0000_revs_x_added_0_copies 63519bfd42ee a36a2a865d92 : 0.419989 s, 0.370675 s, -0.049314 s, ? 0.8826 mozilla-try x0000_revs_x_added_x_copies 9fe69ff0762d bcabf2a78927 : 0.401521 s, 0.358020 s, -0.043501 s, ? 0.8917 mozilla-try x0000_revs_xx000_added_x_copies 156f6e2674f2 4d0f2c178e66 : 0.179555 s, 0.145235 s, -0.034320 s, ? 0.8089 mozilla-try x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 0.038004 s, 0.037606 s, -0.000398 s, ? 0.9895 mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 52.838482 s, 7.382439 s, -45.456043 s, ? 0.1397 mozilla-try x0000_revs_x0000_added_x0000_copies e928c65095ed e951f4ad123a : 8.705874 s, 7.273506 s, -1.432368 s, ? 0.8355 mozilla-try x00000_revs_x00000_added_0_copies dc8a3ca7010e d16fde900c9c : 1.126708 s, 1.074593 s, -0.052115 s, ? 0.9537 mozilla-try x00000_revs_x0000_added_x0000_copies 8d3fafa80d4b eb884023b810 : 83.854020 s, 27.746195 s, -56.107825 s, ? 0.3309 Below is a table comparing the runtime of the current "filelog centric" algorithm, with the "changeset centric" one, we just modified. The changeset centric algorithm is a significant win in many scenario, but they are still various cases where it is quite slower. When many revision has to be considered the cost of retrieving the copy information, creating new dictionaries, merging dictionaries and checking if revision are ancestors of each other can slow things down. The rest of this series, will introduce a rust version of the copy tracing code to deal with most of theses issues. Repo Case Source-Rev Dest-Rev filelog sidedata Difference Factor --------------------------------------------------------------------------------------------------------------------------------------- mercurial x_revs_x_added_0_copies ad6b123de1c7 39cfcef4f463 : 0.000914 s, 0.000044 s, - 0.000870 s, ? 0.048140 mercurial x_revs_x_added_x_copies 2b1c78674230 0c1d10351869 : 0.001812 s, 0.000138 s, - 0.001674 s, ? 0.076159 mercurial x000_revs_x000_added_x_copies 81f8ff2a9bf2 dd3267698d84 : 0.017954 s, 0.005052 s, - 0.012902 s, ? 0.281386 pypy x_revs_x_added_0_copies aed021ee8ae8 099ed31b181b : 0.001509 s, 0.000219 s, - 0.001290 s, ? 0.145129 pypy x_revs_x000_added_0_copies 4aa4e1f8e19a 359343b9ac0e : 0.206881 s, 0.000055 s, - 0.206826 s, ? 0.000266 pypy x_revs_x_added_x_copies ac52eb7bbbb0 72e022663155 : 0.016951 s, 0.000128 s, - 0.016823 s, ? 0.007551 pypy x_revs_x00_added_x_copies c3b14617fbd7 ace7255d9a26 : 0.019096 s, 0.001089 s, - 0.018007 s, ? 0.057028 pypy x_revs_x000_added_x000_copies df6f7a526b60 a83dc6a2d56f : 0.762506 s, 0.017407 s, - 0.745099 s, ? 0.022829 pypy x000_revs_xx00_added_0_copies 89a76aede314 2f22446ff07e : 1.179211 s, 0.094175 s, - 1.085036 s, ? 0.079863 pypy x000_revs_x000_added_x_copies 8a3b5bfd266e 2c68e87c3efe : 1.249058 s, 0.238009 s, - 1.011049 s, ? 0.190551 pypy x000_revs_x000_added_x000_copies 89a76aede314 7b3dda341c84 : 1.614107 s, 0.125876 s, - 1.488231 s, ? 0.077985 pypy x0000_revs_x_added_0_copies d1defd0dc478 c9cb1334cc78 : 0.001064 s, 3.581556 s, + 3.580492 s, ? 3366.124060 pypy x0000_revs_xx000_added_0_copies bf2c629d0071 4ffed77c095c : 1.061275 s, 0.016721 s, - 1.044554 s, ? 0.015756 pypy x0000_revs_xx000_added_x000_copies 08ea3258278e d9fa043f30c0 : 1.341119 s, 0.242367 s, - 1.098752 s, ? 0.180720 netbeans x_revs_x_added_0_copies fb0955ffcbcd a01e9239f9e7 : 0.027803 s, 0.000165 s, - 0.027638 s, ? 0.005935 netbeans x_revs_x000_added_0_copies 6f360122949f 20eb231cc7d0 : 0.130014 s, 0.000114 s, - 0.129900 s, ? 0.000877 netbeans x_revs_x_added_x_copies 1ada3faf6fb6 5a39d12eecf4 : 0.024990 s, 0.000296 s, - 0.024694 s, ? 0.011845 netbeans x_revs_x00_added_x_copies 35be93ba1e2c 9eec5e90c05f : 0.052201 s, 0.001124 s, - 0.051077 s, ? 0.021532 netbeans x000_revs_xx00_added_0_copies eac3045b4fdd 51d4ae7f1290 : 0.037642 s, 0.013060 s, - 0.024582 s, ? 0.346953 netbeans x000_revs_x000_added_x_copies e2063d266acd 6081d72689dc : 0.197086 s, 0.017112 s, - 0.179974 s, ? 0.086825 netbeans x000_revs_x000_added_x000_copies ff453e9fee32 411350406ec2 : 0.935148 s, 0.660350 s, - 0.274798 s, ? 0.706145 netbeans x0000_revs_xx000_added_x000_copies 588c2d1ced70 1aad62e59ddd : 3.920674 s, 10.032499 s, + 6.111825 s, ? 2.558871 mozilla-central x_revs_x_added_0_copies 3697f962bb7b 7015fcdd43a2 : 0.024232 s, 0.000189 s, - 0.024043 s, ? 0.007800 mozilla-central x_revs_x000_added_0_copies dd390860c6c9 40d0c5bed75d : 0.141483 s, 0.000462 s, - 0.141021 s, ? 0.003265 mozilla-central x_revs_x_added_x_copies 8d198483ae3b 14207ffc2b2f : 0.025775 s, 0.000270 s, - 0.025505 s, ? 0.010475 mozilla-central x_revs_x00_added_x_copies 98cbc58cc6bc 446a150332c3 : 0.084922 s, 0.001474 s, - 0.083448 s, ? 0.017357 mozilla-central x_revs_x000_added_x000_copies 3c684b4b8f68 0a5e72d1b479 : 0.194784 s, 0.004806 s, - 0.189978 s, ? 0.024673 mozilla-central x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 2.161103 s, 0.085150 s, - 2.075953 s, ? 0.039401 mozilla-central x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.089347 s, 0.007064 s, - 0.082283 s, ? 0.079063 mozilla-central x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.732171 s, 0.004741 s, - 0.727430 s, ? 0.006475 mozilla-central x000_revs_x000_added_x000_copies 7c97034feb78 4407bd0c6330 : 1.157287 s, 0.190133 s, - 0.967154 s, ? 0.164292 mozilla-central x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 6.726568 s, 0.035651 s, - 6.690917 s, ? 0.005300 mozilla-central x0000_revs_xx000_added_x000_copies f78c615a656c 96a38b690156 : 3.266229 s, 0.440694 s, - 2.825535 s, ? 0.134924 mozilla-central x00000_revs_x0000_added_x0000_copies 6832ae71433c 4c222a1d9a00 : 15.860534 s, 18.454163 s, + 2.593629 s, ? 1.163527 mozilla-central x00000_revs_x00000_added_x000_copies 76caed42cf7c 1daa622bbe42 : 20.450475 s, 31.562719 s, +11.112244 s, ? 1.543373 mozilla-try x_revs_x_added_0_copies aaf6dde0deb8 9790f499805a : 0.080442 s, 0.001189 s, - 0.079253 s, ? 0.014781 mozilla-try x_revs_x000_added_0_copies d8d0222927b4 5bb8ce8c7450 : 0.497672 s, 0.001204 s, - 0.496468 s, ? 0.002419 mozilla-try x_revs_x_added_x_copies 092fcca11bdb 936255a0384a : 0.021183 s, 0.000586 s, - 0.020597 s, ? 0.027664 mozilla-try x_revs_x00_added_x_copies b53d2fadbdb5 017afae788ec : 0.230991 s, 0.001845 s, - 0.229146 s, ? 0.007987 mozilla-try x_revs_x000_added_x000_copies 20408ad61ce5 6f0ee96e21ad : 1.118461 s, 0.063822 s, - 1.054639 s, ? 0.057062 mozilla-try x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 2.206083 s, 0.088038 s, - 2.118045 s, ? 0.039907 mozilla-try x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.089404 s, 0.007389 s, - 0.082015 s, ? 0.082647 mozilla-try x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.733043 s, 0.004868 s, - 0.728175 s, ? 0.006641 mozilla-try x000_revs_x000_added_x000_copies 1346fd0130e4 4c65cbdabc1f : 1.163367 s, 0.222450 s, - 0.940917 s, ? 0.191212 mozilla-try x0000_revs_x_added_0_copies 63519bfd42ee a36a2a865d92 : 0.085456 s, 0.370675 s, + 0.285219 s, ? 4.337612 mozilla-try x0000_revs_x_added_x_copies 9fe69ff0762d bcabf2a78927 : 0.083601 s, 0.358020 s, + 0.274419 s, ? 4.282485 mozilla-try x0000_revs_xx000_added_x_copies 156f6e2674f2 4d0f2c178e66 : 7.366614 s, 0.145235 s, - 7.221379 s, ? 0.019715 mozilla-try x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 6.664464 s, 0.037606 s, - 6.626858 s, ? 0.005643 mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 7.467836 s, 7.382439 s, - 0.085397 s, ? 0.988565 mozilla-try x0000_revs_x0000_added_x0000_copies e928c65095ed e951f4ad123a : 9.801294 s, 7.273506 s, - 2.527788 s, ? 0.742097 mozilla-try x00000_revs_x_added_0_copies 6a320851d377 1ebb79acd503 : 0.091886 s, killed mozilla-try x00000_revs_x00000_added_0_copies dc8a3ca7010e d16fde900c9c : 26.491140 s, 1.074593 s, -25.416547 s, ? 0.040564 mozilla-try x00000_revs_x_added_x_copies 5173c4b6f97c 95d83ee7242d : 0.092863 s, killed mozilla-try x00000_revs_x000_added_x_copies 9126823d0e9c ca82787bb23c : 0.226823 s, killed mozilla-try x00000_revs_x0000_added_x0000_copies 8d3fafa80d4b eb884023b810 : 18.914630 s, 27.746195 s, + 8.831565 s, ? 1.466917 mozilla-try x00000_revs_x00000_added_x0000_copies 1b661134e2ca 1ae03d022d6d : 21.198903 s, killed mozilla-try x00000_revs_x00000_added_x000_copies 9b2a99adc05e 8e29777b48e6 : 24.952268 s, killed Differential Revision: https://phab.mercurial-scm.org/D9296
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 02 Nov 2020 11:03:56 +0100
parents 7252f5237352
children 8d6164098782
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use std::borrow::Cow;
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2 use std::fs::File;
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3 use std::io::Read;
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4 use std::ops::Deref;
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5 use std::path::Path;
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6
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7 use byteorder::{BigEndian, ByteOrder};
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8 use crypto::digest::Digest;
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9 use crypto::sha1::Sha1;
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10 use flate2::read::ZlibDecoder;
26c53ee51c68 hg-core: Add a limited read only `revlog` implementation
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11 use memmap::{Mmap, MmapOptions};
26c53ee51c68 hg-core: Add a limited read only `revlog` implementation
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12 use micro_timer::timed;
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13 use zstd;
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14
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15 use super::index::Index;
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16 use super::node::{NODE_BYTES_LENGTH, NULL_NODE_ID};
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17 use super::patch;
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18 use crate::revlog::Revision;
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19
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20 pub enum RevlogError {
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21 IoError(std::io::Error),
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22 UnsuportedVersion(u16),
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23 InvalidRevision,
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24 Corrupted,
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25 UnknowDataFormat(u8),
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26 }
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27
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28 fn mmap_open(path: &Path) -> Result<Mmap, std::io::Error> {
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29 let file = File::open(path)?;
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30 let mmap = unsafe { MmapOptions::new().map(&file) }?;
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31 Ok(mmap)
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32 }
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33
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34 /// Read only implementation of revlog.
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35 pub struct Revlog {
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36 /// When index and data are not interleaved: bytes of the revlog index.
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37 /// When index and data are interleaved: bytes of the revlog index and
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38 /// data.
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39 index: Index,
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40 /// When index and data are not interleaved: bytes of the revlog data
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41 data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>>,
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42 }
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43
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44 impl Revlog {
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45 /// Open a revlog index file.
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46 ///
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47 /// It will also open the associated data file if index and data are not
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48 /// interleaved.
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49 #[timed]
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50 pub fn open(
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51 index_path: &Path,
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52 data_path: Option<&Path>,
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53 ) -> Result<Self, RevlogError> {
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54 let index_mmap =
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55 mmap_open(&index_path).map_err(RevlogError::IoError)?;
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56
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57 let version = get_version(&index_mmap);
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58 if version != 1 {
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59 return Err(RevlogError::UnsuportedVersion(version));
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60 }
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61
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62 let index = Index::new(Box::new(index_mmap))?;
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63
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64 let default_data_path = index_path.with_extension("d");
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65
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66 // type annotation required
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67 // won't recognize Mmap as Deref<Target = [u8]>
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68 let data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>> =
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69 if index.is_inline() {
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70 None
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71 } else {
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72 let data_path = data_path.unwrap_or(&default_data_path);
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73 let data_mmap =
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74 mmap_open(data_path).map_err(RevlogError::IoError)?;
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75 Some(Box::new(data_mmap))
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76 };
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77
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78 Ok(Revlog { index, data_bytes })
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79 }
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80
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81 /// Return number of entries of the `Revlog`.
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82 pub fn len(&self) -> usize {
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83 self.index.len()
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84 }
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85
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86 /// Returns `true` if the `Revlog` has zero `entries`.
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87 pub fn is_empty(&self) -> bool {
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88 self.index.is_empty()
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89 }
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90
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91 /// Return the full data associated to a node.
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92 #[timed]
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93 pub fn get_node_rev(&self, node: &[u8]) -> Result<Revision, RevlogError> {
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94 // This is brute force. But it is fast enough for now.
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95 // Optimization will come later.
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96 for rev in (0..self.len() as Revision).rev() {
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97 let index_entry =
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98 self.index.get_entry(rev).ok_or(RevlogError::Corrupted)?;
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99 if node == index_entry.hash() {
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100 return Ok(rev);
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101 }
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102 }
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103 Err(RevlogError::InvalidRevision)
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104 }
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105
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106 /// Return the full data associated to a revision.
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107 ///
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108 /// All entries required to build the final data out of deltas will be
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109 /// retrieved as needed, and the deltas will be applied to the inital
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110 /// snapshot to rebuild the final data.
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111 #[timed]
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112 pub fn get_rev_data(&self, rev: Revision) -> Result<Vec<u8>, RevlogError> {
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113 // Todo return -> Cow
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114 let mut entry = self.get_entry(rev)?;
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115 let mut delta_chain = vec![];
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116 while let Some(base_rev) = entry.base_rev {
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117 delta_chain.push(entry);
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118 entry =
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119 self.get_entry(base_rev).or(Err(RevlogError::Corrupted))?;
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120 }
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121
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122 // TODO do not look twice in the index
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123 let index_entry = self
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124 .index
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125 .get_entry(rev)
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126 .ok_or(RevlogError::InvalidRevision)?;
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127
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128 let data: Vec<u8> = if delta_chain.is_empty() {
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129 entry.data()?.into()
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130 } else {
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131 Revlog::build_data_from_deltas(entry, &delta_chain)?
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132 };
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133
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134 if self.check_hash(
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135 index_entry.p1(),
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136 index_entry.p2(),
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137 index_entry.hash(),
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138 &data,
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139 ) {
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140 Ok(data)
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141 } else {
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142 Err(RevlogError::Corrupted)
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143 }
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144 }
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145
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146 /// Check the hash of some given data against the recorded hash.
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147 pub fn check_hash(
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148 &self,
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149 p1: Revision,
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150 p2: Revision,
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151 expected: &[u8],
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152 data: &[u8],
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153 ) -> bool {
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154 let e1 = self.index.get_entry(p1);
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155 let h1 = match e1 {
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156 Some(ref entry) => entry.hash(),
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157 None => &NULL_NODE_ID,
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158 };
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159 let e2 = self.index.get_entry(p2);
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160 let h2 = match e2 {
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161 Some(ref entry) => entry.hash(),
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162 None => &NULL_NODE_ID,
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163 };
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164
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165 hash(data, &h1, &h2).as_slice() == expected
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166 }
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167
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168 /// Build the full data of a revision out its snapshot
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169 /// and its deltas.
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170 #[timed]
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171 fn build_data_from_deltas(
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172 snapshot: RevlogEntry,
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173 deltas: &[RevlogEntry],
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174 ) -> Result<Vec<u8>, RevlogError> {
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175 let snapshot = snapshot.data()?;
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176 let deltas = deltas
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177 .iter()
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178 .rev()
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179 .map(RevlogEntry::data)
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180 .collect::<Result<Vec<Cow<'_, [u8]>>, RevlogError>>()?;
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181 let patches: Vec<_> =
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182 deltas.iter().map(|d| patch::PatchList::new(d)).collect();
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183 let patch = patch::fold_patch_lists(&patches);
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184 Ok(patch.apply(&snapshot))
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185 }
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186
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187 /// Return the revlog data.
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188 fn data(&self) -> &[u8] {
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189 match self.data_bytes {
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190 Some(ref data_bytes) => &data_bytes,
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191 None => panic!(
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192 "forgot to load the data or trying to access inline data"
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193 ),
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194 }
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195 }
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196
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197 /// Get an entry of the revlog.
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198 fn get_entry(&self, rev: Revision) -> Result<RevlogEntry, RevlogError> {
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199 let index_entry = self
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200 .index
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201 .get_entry(rev)
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202 .ok_or(RevlogError::InvalidRevision)?;
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203 let start = index_entry.offset();
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204 let end = start + index_entry.compressed_len();
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205 let data = if self.index.is_inline() {
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206 self.index.data(start, end)
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207 } else {
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208 &self.data()[start..end]
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209 };
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210 let entry = RevlogEntry {
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211 rev,
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212 bytes: data,
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213 compressed_len: index_entry.compressed_len(),
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214 uncompressed_len: index_entry.uncompressed_len(),
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215 base_rev: if index_entry.base_revision() == rev {
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216 None
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217 } else {
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218 Some(index_entry.base_revision())
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219 },
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220 };
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221 Ok(entry)
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222 }
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223 }
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224
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225 /// The revlog entry's bytes and the necessary informations to extract
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226 /// the entry's data.
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227 #[derive(Debug)]
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228 pub struct RevlogEntry<'a> {
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229 rev: Revision,
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230 bytes: &'a [u8],
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231 compressed_len: usize,
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232 uncompressed_len: usize,
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233 base_rev: Option<Revision>,
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234 }
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235
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236 impl<'a> RevlogEntry<'a> {
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237 /// Extract the data contained in the entry.
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238 pub fn data(&self) -> Result<Cow<'_, [u8]>, RevlogError> {
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239 if self.bytes.is_empty() {
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240 return Ok(Cow::Borrowed(&[]));
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241 }
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242 match self.bytes[0] {
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243 // Revision data is the entirety of the entry, including this
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244 // header.
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245 b'\0' => Ok(Cow::Borrowed(self.bytes)),
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246 // Raw revision data follows.
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247 b'u' => Ok(Cow::Borrowed(&self.bytes[1..])),
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248 // zlib (RFC 1950) data.
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249 b'x' => Ok(Cow::Owned(self.uncompressed_zlib_data()?)),
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250 // zstd data.
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251 b'\x28' => Ok(Cow::Owned(self.uncompressed_zstd_data()?)),
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252 format_type => Err(RevlogError::UnknowDataFormat(format_type)),
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253 }
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254 }
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255
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256 fn uncompressed_zlib_data(&self) -> Result<Vec<u8>, RevlogError> {
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257 let mut decoder = ZlibDecoder::new(self.bytes);
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258 if self.is_delta() {
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259 let mut buf = Vec::with_capacity(self.compressed_len);
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260 decoder
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261 .read_to_end(&mut buf)
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262 .or(Err(RevlogError::Corrupted))?;
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263 Ok(buf)
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264 } else {
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265 let mut buf = vec![0; self.uncompressed_len];
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266 decoder
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267 .read_exact(&mut buf)
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268 .or(Err(RevlogError::Corrupted))?;
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269 Ok(buf)
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270 }
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271 }
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272
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273 fn uncompressed_zstd_data(&self) -> Result<Vec<u8>, RevlogError> {
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274 if self.is_delta() {
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275 let mut buf = Vec::with_capacity(self.compressed_len);
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276 zstd::stream::copy_decode(self.bytes, &mut buf)
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277 .or(Err(RevlogError::Corrupted))?;
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278 Ok(buf)
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279 } else {
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280 let mut buf = vec![0; self.uncompressed_len];
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281 let len = zstd::block::decompress_to_buffer(self.bytes, &mut buf)
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282 .or(Err(RevlogError::Corrupted))?;
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283 if len != self.uncompressed_len {
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284 Err(RevlogError::Corrupted)
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285 } else {
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286 Ok(buf)
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287 }
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288 }
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289 }
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290
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291 /// Tell if the entry is a snapshot or a delta
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292 /// (influences on decompression).
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293 fn is_delta(&self) -> bool {
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294 self.base_rev.is_some()
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295 }
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296 }
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297
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298 /// Format version of the revlog.
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299 pub fn get_version(index_bytes: &[u8]) -> u16 {
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300 BigEndian::read_u16(&index_bytes[2..=3])
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301 }
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302
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303 /// Calculate the hash of a revision given its data and its parents.
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304 fn hash(data: &[u8], p1_hash: &[u8], p2_hash: &[u8]) -> Vec<u8> {
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305 let mut hasher = Sha1::new();
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306 let (a, b) = (p1_hash, p2_hash);
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307 if a > b {
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308 hasher.input(b);
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309 hasher.input(a);
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310 } else {
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311 hasher.input(a);
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312 hasher.input(b);
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313 }
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314 hasher.input(data);
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315 let mut hash = vec![0; NODE_BYTES_LENGTH];
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316 hasher.result(&mut hash);
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317 hash
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318 }
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319
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320 #[cfg(test)]
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321 mod tests {
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322 use super::*;
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323
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324 use super::super::index::IndexEntryBuilder;
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325
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326 #[test]
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327 fn version_test() {
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328 let bytes = IndexEntryBuilder::new()
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329 .is_first(true)
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330 .with_version(1)
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331 .build();
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332
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333 assert_eq!(get_version(&bytes), 1)
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334 }
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335 }