Generate a unique deployment id for each deployment (#680)

* Move cluster name generation into a function

* Generate a unique deployment id for each deployment

stack_orchestrator/deploy/deployment_context.py

@@ -14,15 +14,19 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http:#www.gnu.org/licenses/>.
 
+import hashlib
+import os
 from pathlib import Path
 
 from stack_orchestrator import constants
+from stack_orchestrator.util import get_yaml
 from stack_orchestrator.deploy.stack import Stack
 from stack_orchestrator.deploy.spec import Spec
 
 
 class DeploymentContext:
     deployment_dir: Path
+    id: str
     spec: Spec
     stack: Stack
 
@@ -35,9 +39,14 @@ class DeploymentContext:
     def get_env_file(self):
         return self.deployment_dir.joinpath(constants.config_file_name)
 
-    # TODO: implement me
-    def get_cluster_name(self):
-        return None
+    def get_deployment_file(self):
+        return self.deployment_dir.joinpath(constants.deployment_file_name)
+
+    def get_compose_dir(self):
+        return self.deployment_dir.joinpath(constants.compose_dir_name)
+
+    def get_cluster_id(self):
+        return self.id
 
     def init(self, dir):
         self.deployment_dir = dir
@@ -45,3 +54,16 @@ class DeploymentContext:
         self.spec.init_from_file(self.get_spec_file())
         self.stack = Stack(self.spec.obj["stack"])
         self.stack.init_from_file(self.get_stack_file())
+        deployment_file_path = self.get_deployment_file()
+        if deployment_file_path.exists():
+            with deployment_file_path:
+                obj = get_yaml().load(open(deployment_file_path, "r"))
+                self.id = obj[constants.cluster_id_key]
+        # Handle the case of a legacy deployment with no file
+        # Code below is intended to match the output from _make_default_cluster_name()
+        # TODO: remove when we no longer need to support legacy deployments
+        else:
+            path = os.path.realpath(os.path.abspath(self.get_compose_dir()))
+            unique_cluster_descriptor = f"{path},{self.get_stack_file()},None,None"
+            hash = hashlib.md5(unique_cluster_descriptor.encode()).hexdigest()[:16]
+            self.id = f"{constants.cluster_name_prefix}{hash}"