X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/1b189a0961ba757caf6160285b59daa26c7cdcae..2935de4fbccf43b7daedb9412f2ada1bf65c52ab:/services/api/app/models/job.rb

diff --git a/services/api/app/models/job.rb b/services/api/app/models/job.rb
index a09ddb2aad..4b86be7969 100644
--- a/services/api/app/models/job.rb
+++ b/services/api/app/models/job.rb
@@ -14,6 +14,7 @@ class Job < ArvadosModel
   validate :ensure_script_version_is_commit
   validate :find_docker_image_locator
   validate :validate_status
+  validate :validate_state_change
 
   has_many :commit_ancestors, :foreign_key => :descendant, :primary_key => :script_version
   has_many(:nodes, foreign_key: :job_uuid, primary_key: :uuid)
@@ -88,6 +89,18 @@ class Job < ArvadosModel
       order('priority desc, created_at')
   end
 
+  def lock locked_by_uuid
+    transaction do
+      self.reload
+      unless self.state == Queued and self.is_locked_by_uuid.nil?
+        raise AlreadyLockedError
+      end
+      self.state = Running
+      self.is_locked_by_uuid = locked_by_uuid
+      self.save!
+    end
+  end
+
   protected
 
   def foreign_key_attributes
@@ -110,7 +123,7 @@ class Job < ArvadosModel
   end
 
   def ensure_script_version_is_commit
-    if self.is_locked_by_uuid and self.started_at
+    if self.state == Running
       # Apparently client has already decided to go for it. This is
       # needed to run a local job using a local working directory
       # instead of a commit-ish.
@@ -197,7 +210,8 @@ class Job < ArvadosModel
           success_changed? or
           output_changed? or
           log_changed? or
-          tasks_summary_changed?
+          tasks_summary_changed? or
+          state_changed?
         logger.warn "User #{current_user.uuid if current_user} tried to change protected job attributes on locked #{self.class.to_s} #{uuid_was}"
         return false
       end
@@ -315,4 +329,30 @@ class Job < ArvadosModel
     end
   end
 
+  def validate_state_change
+    ok = true
+    if self.state_changed?
+      ok = case self.state_was
+           when nil
+             # state isn't set yet
+             true
+           when Queued
+             # Permit going from queued to any state
+             true
+           when Running
+             # From running, may only transition to a finished state
+             [Complete, Failed, Cancelled].include? self.state
+           when Complete, Failed, Cancelled
+             # Once in a finished state, don't permit any more state changes
+             false
+           else
+             # Any other state transition is also invalid
+             false
+           end
+      if not ok
+        errors.add :state, "invalid change from #{self.state_was} to #{self.state}"
+      end
+    end
+    ok
+  end
 end