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gerrit / zoekt / e20e7193156aebaff2c28c0598bd47f2066eba14
commite20e7193156aebaff2c28c0598bd47f2066eba14[log] [tgz]
authorHan-Wen Nienhuys <hanwen@google.com>Tue Jun 20 17:37:06 2017 +0200
committerHan-Wen Nienhuys <hanwen@google.com>Tue Jun 20 17:44:06 2017 +0200
treebaa81813f32de8939a09bc4c35fc5ed092f006b9
parent7fc542ed2590942edf757dfcc34a8a9aa926a258 [diff]
Revert "Load shards as fast as we can"

The current strategy has an unexplained deadlock, which apparently
triggers when read requests happen concurrently with reloads.

Since the GCP load balancer issues a continuing stream of HTTP
requests for /, each of which triggers a read across shards, the
deadlock trigger in production reliably.

This reverts commit e9c19a019ce90ce9ce7021c81c8d0bb10aedeaed.

Change-Id: I5b5234d204a9e9303ab84b098443dd9e9709318f
2 files changed
tree: baa81813f32de8939a09bc4c35fc5ed092f006b9
  1. build/
  2. cmd/
  3. ctags/
  4. doc/
  5. gitindex/
  6. query/
  7. rest/
  8. shards/
  9. web/
  10. .gitignore
  11. all.bash
  12. api.go
  13. bits.go
  14. bits_test.go
  15. build-deploy.sh
  16. contentprovider.go
  17. CONTRIBUTING
  18. dociter.go
  19. eval.go
  20. index_portable.go
  21. index_test.go
  22. indexbuilder.go
  23. indexfile.go
  24. indexfile_linux.go
  25. LICENSE
  26. read.go
  27. read_test.go
  28. README.md
  29. section.go
  30. section_test.go
  31. toc.go
  32. write.go
README.md
"Zoekt, en gij zult spinazie eten" - Jan Eertink

("seek, and ye shall eat spinach" - My primary school teacher)

This is a fast text search engine, intended for use with source code. (Pronunciation: roughly as you would pronounce “zooked” in English)

INSTRUCTIONS

Downloading:

go get github.com/google/zoekt/

Indexing:

go install github.com/google/zoekt/cmd/zoekt-index
$GOPATH/bin/zoekt-index .

Searching

go install github.com/google/zoekt/cmd/zoekt
$GOPATH/bin/zoekt 'ngram f:READ'

Indexing git repositories (requires libgit2 + git2go):

go install github.com/google/zoekt/cmd/zoekt-git-index
$GOPATH/bin/zoekt-git-index -branches master,stable-1.4 -prefix origin/ .

Indexing repo repositories (requires libgit2 + git2go):

go install github.com/google/zoekt/cmd/zoekt-{repo-index,mirror-gitiles}
zoekt-mirror-gitiles -dest ~/repos/ https://gfiber.googlesource.com
zoekt-repo-index \
   -name gfiber \
   -base_url https://gfiber.googlesource.com/ \
   -manifest_repo ~/repos/gfiber.googlesource.com/manifests.git \
   -repo_cache ~/repos \
   -manifest_rev_prefix=refs/heads/ --rev_prefix= \
   master:default_unrestricted.xml

Starting the web interface

go install github.com/google/zoekt/cmd/zoekt-webserver
$GOPATH/bin/zoekt-webserver -listen :6070

A more organized installation on a Linux server should use a systemd unit file, eg.

[Unit]
Description=zoekt webserver

[Service]
ExecStart=/zoekt/bin/zoekt-webserver -index /zoekt/index -listen :443  --ssl_cert /zoekt/etc/cert.pem   --ssl_key /zoekt/etc/key.pem
Restart=always

[Install]
WantedBy=default.target

SEARCH SERVICE

Zoekt comes with a small service management program:

go install github.com/google/zoekt/cmd/zoekt-indexserver

cat << EOF > config.json
[{"GithubUser": "username"},
 {"GitilesURL": "https://gerrit.googlesource.com", Name: "zoekt" }
]
EOF

$GOPATH/bin/zoekt-server -mirror_config config.json

This will mirror all repos under ‘github.com/username’ as well as the ‘zoekt’ repository. It will index the repositories.

It takes care of fetching and indexing new data and cleaning up logfiles.

The webserver can be started from a standard service management framework, such as systemd.

SYMBOL SEARCH

It is recommended to install CTags to improve ranking:

  • Universal ctags is more up to date, but not commonly packaged for distributions. It must be compiled from source.
  • Exuberant ctags is a languishing, but commonly available through Linux distributions. It has several known vulnerabilities.

If you index untrusted code, it is strongly recommended to also install Bazel's sandbox, to avoid vulnerabilities of ctags opening up access to the indexing machine. A blessed version of the sandbox is under cmd/zoek-sandbox. It can be compiled with a simple make call.

ACKNOWLEDGEMENTS

Thanks to Alexander Neubeck for coming up with this idea, and helping me flesh it out.

DISCLAIMER

This is not an official Google product