96 lines
3.7 KiB
Ruby
96 lines
3.7 KiB
Ruby
# frozen_string_literal: true
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module Deployments
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# Service class for linking merge requests to deployments.
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class LinkMergeRequestsService
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attr_reader :deployment
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# The number of commits per query for which to find merge requests.
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COMMITS_PER_QUERY = 5_000
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def initialize(deployment)
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@deployment = deployment
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end
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def execute
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# Review apps have the environment type set (e.g. to `review`, though the
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# exact value may differ). We don't want to link merge requests to review
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# app deployments, as this is not useful.
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return unless deployment.environment.should_link_to_merge_requests?
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# This service is triggered by a Sidekiq worker, which only runs when a
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# deployment is successful. We add an extra check here in case we ever
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# call this service elsewhere and forget to check the status there.
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#
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# The reason we only want to link successful deployments is as follows:
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# when we link a merge request, we don't link it to future deployments for
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# the same environment. If we were to link an MR to a failed deploy, we
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# wouldn't be able to later on link it to a successful deploy (e.g. after
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# the deploy is retried).
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#
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# In addition, showing failed deploys in the UI of a merge request isn't
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# useful to users, as they can't act upon the information in any
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# meaningful way (i.e. they can't just retry the deploy themselves).
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return unless deployment.success?
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if (prev = deployment.previous_deployment)
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link_merge_requests_for_range(prev.sha, deployment.sha)
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else
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# When no previous deployment is found we fall back to linking all merge
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# requests merged into the deployed branch. This will not always be
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# accurate, but it's better than having no data.
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#
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# We can't use the first commit in the repository as a base to compare
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# to, as this will not scale to large repositories. For example, GitLab
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# itself has over 150 000 commits.
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link_all_merged_merge_requests
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end
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end
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def link_merge_requests_for_range(from, to)
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commits = project
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.repository
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.commits_between(from, to)
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.map(&:id)
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# For some projects the list of commits to deploy may be very large. To
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# ensure we do not end up running SQL queries with thousands of WHERE IN
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# values, we run one query per a certain number of commits.
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#
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# In most cases this translates to only a single query. For very large
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# deployment we may end up running a handful of queries to get and insert
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# the data.
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commits.each_slice(COMMITS_PER_QUERY) do |slice|
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merge_requests =
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project.merge_requests.merged.by_merge_commit_sha(slice)
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deployment.link_merge_requests(merge_requests)
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# The cherry picked commits are tracked via `notes.commit_id`
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# See https://gitlab.com/gitlab-org/gitlab/-/merge_requests/22209
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#
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# NOTE: cross-joining `merge_requests` table and `notes` table could
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# result in very poor performance because PG planner often uses an
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# inappropriate index.
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# See https://gitlab.com/gitlab-org/gitlab/-/issues/321032.
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mr_ids = project.notes.cherry_picked_merge_requests(slice)
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picked_merge_requests = project.merge_requests.id_in(mr_ids)
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deployment.link_merge_requests(picked_merge_requests)
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end
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end
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def link_all_merged_merge_requests
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merge_requests =
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project.merge_requests.merged.by_target_branch(deployment.ref)
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deployment.link_merge_requests(merge_requests)
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end
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private
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def project
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deployment.project
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end
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end
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end
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