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revision_resolver.rb
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revision_resolver.rb
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require 'actions/revision_create'
module VCAP::CloudController
class RevisionResolver
class NoUpdateRollback < StandardError; end
class << self
def update_app_revision(app, user_audit_info)
return nil unless app.revisions_enabled && app.droplet_guid.present?
latest_revision = app.latest_revision
if latest_revision.nil?
return RevisionCreate.create(
app: app,
droplet_guid: app.droplet_guid,
environment_variables: app.environment_variables,
description: 'Initial revision.',
commands_by_process_type: app.commands_by_process_type,
user_audit_info: user_audit_info
)
end
reasons = revision_reasons(latest_revision, app)
if reasons.empty?
latest_revision
else
RevisionCreate.create(
app: app,
droplet_guid: app.droplet_guid,
environment_variables: app.environment_variables,
description: formatted_revision_reasons(reasons),
commands_by_process_type: app.commands_by_process_type,
user_audit_info: user_audit_info
)
end
end
def rollback_app_revision(app, revision, user_audit_info)
return nil unless app.revisions_enabled
reasons = revision_reasons(app.latest_revision, revision)
raise NoUpdateRollback.new('Unable to rollback. The code and configuration you are rolling back to is the same as the deployed revision.') if reasons.empty?
reasons.push("Rolled back to revision #{revision.version}.")
RevisionCreate.create(
app: app,
droplet_guid: revision.droplet_guid,
environment_variables: revision.environment_variables,
description: formatted_revision_reasons(reasons),
commands_by_process_type: revision.commands_by_process_type,
user_audit_info: user_audit_info
)
end
private
def revision_reasons(latest_revision, revision_to_create)
reasons = []
reasons.push('New droplet deployed.') if latest_revision.droplet_guid != revision_to_create.droplet_guid
reasons.push('New environment variables deployed.') if latest_revision.environment_variables != revision_to_create.environment_variables
reasons.push(*list_process_command_changes(
latest_revision.commands_by_process_type,
revision_to_create.commands_by_process_type
))
sidecars_differences = Hashdiff.diff(
latest_revision.sidecars.sort_by(&:name).map(&:to_hash),
revision_to_create.sidecars.sort_by(&:name).map(&:to_hash)
)
reasons << 'Sidecars updated.' if sidecars_differences.present?
reasons.sort
end
def formatted_revision_reasons(reasons)
reasons.join(' ')
end
def list_process_command_changes(commands_by_process_type_a, commands_by_process_type_b)
commands_differences = Hashdiff.diff(commands_by_process_type_a, commands_by_process_type_b)
commands_differences.map do |change_type, process_type, *command_change|
if change_type == '+'
"New process type '#{process_type}' added."
elsif change_type == '-'
"Process type '#{process_type}' removed."
elsif command_change[0].nil?
"Custom start command added for '#{process_type}' process."
elsif command_change[1].nil?
"Custom start command removed for '#{process_type}' process."
else
"Custom start command updated for '#{process_type}' process."
end
end
end
end
end
end