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phorge-phorge/resources/sql/autopatches/20140116.reporefcursor.sql
epriestley f4b9efe256 Introduce ref cursors for repository parsing
Summary:
Ref T4327. I want to make change parsing testable; one thing which is blocking this is that the Git discovery process is still part of `PullLocal` daemon instead of being part of `DiscoveryEngine`. The unit test stuff which I want to use for change parsing relies on `DiscoveryEngine` to discover repositories during unit tests.

The major reason git discovery isn't part of `DiscoveryEngine` is that it relies on the messy "autoclose" logic, which we never implemented for Mercurial. Generally, I don't like how autoclose was implemented: it's complicated and gross and too hard to figure out and extend.

Instead, I want to do something more similar to what we do for pushes, which is cleaner overall. Basically this means remembering the old branch heads from the last time we parsed a repository, and figuring out what's new by comparing the old and new branch heads. This should give us several advantages:

  - It should be simpler to understand than the autoclose stuff, which is pretty mind-numbing, at least for me.
  - It will let us satisfy branch and tag queries cheaply (from the database) instead of having to go to the repository. We could also satisfy some ref-resolve queries from the database.
  - It should be easier to extend to Mercurial.

This implements the basics -- pretty much a table to store the cursors, which we update only for Git for now.

Test Plan:
  - Ran migration.
  - Ran `bin/repository discover X --trace --verbose` on various repositories with branches and tags, before and after modifying pushes.
  - Pushed commits to a git repo.
  - Looked at database tables.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4327

Differential Revision: https://secure.phabricator.com/D7982
2014-01-17 11:48:53 -08:00

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SQL

CREATE TABLE {$NAMESPACE}_repository.repository_refcursor (
id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
repositoryPHID VARCHAR(64) NOT NULL COLLATE utf8_bin,
refType VARCHAR(32) NOT NULL COLLATE utf8_bin,
refNameHash VARCHAR(12) NOT NULL COLLATE latin1_bin,
refNameRaw LONGTEXT NOT NULL COLLATE latin1_bin,
refNameEncoding VARCHAR(16) COLLATE utf8_bin,
commitIdentifier VARCHAR(40) NOT NULL COLLATE utf8_bin,
KEY `key_cursor` (repositoryPHID, refType, refNameHash)
) ENGINE=InnoDB, COLLATE=utf8_general_ci;