overleaf/services/history-v1
Brian Gough 9babc70df7 Merge pull request #17362 from overleaf/bg-chai-object-id-tests
fix for chai object id tests

GitOrigin-RevId: 98123dbc930c6ee57be3a118177426120482c5f4
2024-07-16 08:04:46 +00:00
..
api Merge pull request #15410 from overleaf/jpa-history-v1-verbose-logging 2023-10-25 08:04:54 +00:00
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config Merge pull request #16859 from overleaf/jpa-sharelatex-cleanup 2024-02-09 09:04:11 +00:00
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storage Merge pull request #18289 from overleaf/ac-ar-eslint-return-await 2024-05-27 10:22:49 +00:00
test Merge pull request #17362 from overleaf/bg-chai-object-id-tests 2024-07-16 08:04:46 +00:00
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.nvmrc Merge pull request #17870 from overleaf/bg-node-upgrade-18-20-2 2024-04-24 08:05:16 +00:00
app.js Merge pull request #19191 from overleaf/em-history-body-limit 2024-07-03 08:04:57 +00:00
buildscript.txt Merge pull request #17870 from overleaf/bg-node-upgrade-18-20-2 2024-04-24 08:05:16 +00:00
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Database migrations

The history service uses knex to manage PostgreSQL migrations.

To create a new migrations, run:

npx knex migrate:make migration_name

To apply migrations, run:

npx knex migrate:latest

For more information, consult the knex migrations guide.

Global blobs

Global blobs are blobs that are shared between projects. The list of global blobs is stored in the projectHistoryGlobalBlobs Mongo collection and is read when the service starts. Changing the list of global blobs needs to be done carefully.

Adding a blob to the global blobs list

If we identify a blob that appears in many projects, we might want to move that blob to the global blobs list.

  1. Add a record for the blob to the projectHistoryGlobalBlobs collection.
  2. Restart the history service.
  3. Delete any corresponding project blobs.

Removing a blob from the global blobs list

Removing a blob from the global blobs list is trickier. As soon as the global blob is made unavailable, every project that needs the blob will have to get its own copy. To avoid disruptions, follow these steps:

  1. In the projectHistoryGlobalBlobs collection, set the demoted property to false on the global blob to remove. This will make the history system write new instances of this blob to project blobs, but still read from the global blob.

  2. Restart the history service.

  3. Copy the blob to all projects that need it.

  4. Remove the blob from the projectHistoryGlobalBlobs collection.

  5. Restart the history service.