Show a better message when a subgraph is published with no changes

crates/rover-client/src/operations/subgraph/publish/publish_mutation.graphql

@@ -25,6 +25,7 @@ mutation SubgraphPublishMutation(
       }
       didUpdateGateway: updatedGateway
       serviceWasCreated: wasCreated
+      serviceWasUpdated: wasUpdated
       launchCliCopy
       launchUrl
     }

crates/rover-client/src/operations/subgraph/publish/runner.rs

@@ -108,6 +108,7 @@ fn build_response(publish_response: UpdateResponse) -> SubgraphPublishResponse {
         },
         supergraph_was_updated: publish_response.did_update_gateway,
         subgraph_was_created: publish_response.service_was_created,
+        subgraph_was_updated: publish_response.service_was_updated,
         build_errors,
         launch_cli_copy: publish_response.launch_cli_copy,
         launch_url: publish_response.launch_url,
@@ -134,7 +135,8 @@ mod tests {
                 }
             ],
             "didUpdateGateway": false,
-            "serviceWasCreated": true
+            "serviceWasCreated": true,
+            "serviceWasUpdated": true
         });
         let update_response: UpdateResponse = serde_json::from_value(json_response).unwrap();
         let output = build_response(update_response);
@@ -158,6 +160,7 @@ mod tests {
                 .into(),
                 supergraph_was_updated: false,
                 subgraph_was_created: true,
+                subgraph_was_updated: true,
                 launch_url: None,
                 launch_cli_copy: None,
             }
@@ -170,7 +173,8 @@ mod tests {
             "compositionConfig": { "schemaHash": "5gf564" },
             "errors": [],
             "didUpdateGateway": true,
-            "serviceWasCreated": true
+            "serviceWasCreated": true,
+            "serviceWasUpdated": true
         });
         let update_response: UpdateResponse = serde_json::from_value(json_response).unwrap();
         let output = build_response(update_response);
@@ -182,6 +186,7 @@ mod tests {
                 build_errors: BuildErrors::new(),
                 supergraph_was_updated: true,
                 subgraph_was_created: true,
+                subgraph_was_updated: true,
                 launch_url: None,
                 launch_cli_copy: None,
             }
@@ -199,7 +204,8 @@ mod tests {
                 "code": null
             }],
             "didUpdateGateway": false,
-            "serviceWasCreated": false
+            "serviceWasCreated": false,
+            "serviceWasUpdated": true
         });
         let update_response: UpdateResponse = serde_json::from_value(json_response).unwrap();
         let output = build_response(update_response);
@@ -216,6 +222,7 @@ mod tests {
                 .into(),
                 supergraph_was_updated: false,
                 subgraph_was_created: false,
+                subgraph_was_updated: true,
                 launch_url: None,
                 launch_cli_copy: None,
             }
@@ -229,6 +236,7 @@ mod tests {
             "errors": [],
             "didUpdateGateway": true,
             "serviceWasCreated": true,
+            "serviceWasUpdated": true,
             "launchUrl": "test.com/launchurl",
             "launchCliCopy": "You can monitor this launch in Apollo Studio: test.com/launchurl",
         });
@@ -242,11 +250,38 @@ mod tests {
                 build_errors: BuildErrors::new(),
                 supergraph_was_updated: true,
                 subgraph_was_created: true,
+                subgraph_was_updated: true,
                 launch_url: Some("test.com/launchurl".to_string()),
                 launch_cli_copy: Some(
                     "You can monitor this launch in Apollo Studio: test.com/launchurl".to_string()
                 ),
             }
         );
     }
+
+    #[test]
+    fn build_response_works_with_unmodified_subgraph() {
+        let json_response = json!({
+            "compositionConfig": { "schemaHash": "5gf564" },
+            "errors": [],
+            "didUpdateGateway": false,
+            "serviceWasCreated": false,
+            "serviceWasUpdated": false
+        });
+        let update_response: UpdateResponse = serde_json::from_value(json_response).unwrap();
+        let output = build_response(update_response);
+
+        assert_eq!(
+            output,
+            SubgraphPublishResponse {
+                api_schema_hash: Some("5gf564".to_string()),
+                build_errors: BuildErrors::new(),
+                supergraph_was_updated: false,
+                subgraph_was_created: false,
+                subgraph_was_updated: false,
+                launch_url: None,
+                launch_cli_copy: None,
+            }
+        );
+    }
 }

crates/rover-client/src/operations/subgraph/publish/types.rs

@@ -32,6 +32,8 @@ pub struct SubgraphPublishResponse {
 
     pub subgraph_was_created: bool,
 
+    pub subgraph_was_updated: bool,
+
     #[serde(skip_serializing)]
     pub build_errors: BuildErrors,
 

docs/source/configuring.md

@@ -197,6 +197,7 @@ Here's an example success output for `rover subgraph publish`:
     "api_schema_hash": "a1bc0d",
     "supergraph_was_updated": true,
     "subgraph_was_created": true,
+    "subgraph_was_updated": true,
     "success": true
   },
   "error": null
@@ -211,6 +212,7 @@ And here's an example error output:
   "data": {
     "api_schema_hash": null,
     "subgraph_was_created": false,
+    "subgraph_was_updated": true,
     "supergraph_was_updated": false,
     "success": true
   },

src/command/output.rs

@@ -183,8 +183,13 @@ impl RoverOutput {
                         subgraph,
                         graph_ref
                     )?;
-                } else {
+                } else if publish_response.subgraph_was_updated {
                     stderrln!("The '{}' subgraph in '{}' was updated", subgraph, graph_ref)?;
+                } else {
+                    stderrln!(
+                        "The '{}' subgraph was NOT updated because no changes were detected",
+                        subgraph
+                    )?;
                 }
 
                 if publish_response.supergraph_was_updated {
@@ -1183,6 +1188,7 @@ mod tests {
             build_errors: BuildErrors::new(),
             supergraph_was_updated: true,
             subgraph_was_created: true,
+            subgraph_was_updated: true,
             launch_url: Some("test.com/launchurl".to_string()),
             launch_cli_copy: Some(
                 "You can monitor this launch in Apollo Studio: test.com/launchurl".to_string(),
@@ -1204,6 +1210,7 @@ mod tests {
                 "api_schema_hash": "123456",
                 "supergraph_was_updated": true,
                 "subgraph_was_created": true,
+                "subgraph_was_updated": true,
                 "success": true,
                 "launch_url": "test.com/launchurl",
                 "launch_cli_copy": "You can monitor this launch in Apollo Studio: test.com/launchurl",
@@ -1233,6 +1240,7 @@ mod tests {
             .into(),
             supergraph_was_updated: false,
             subgraph_was_created: false,
+            subgraph_was_updated: true,
             launch_url: None,
             launch_cli_copy: None,
         };
@@ -1251,6 +1259,7 @@ mod tests {
             "data": {
                 "api_schema_hash": null,
                 "subgraph_was_created": false,
+                "subgraph_was_updated": true,
                 "supergraph_was_updated": false,
                 "success": true,
                 "launch_url": null,
@@ -1280,6 +1289,43 @@ mod tests {
         assert_json_eq!(expected_json, actual_json);
     }
 
+    #[test]
+    fn subgraph_publish_unchanged_response_json() {
+        let mock_publish_response = SubgraphPublishResponse {
+            api_schema_hash: Some("123456".to_string()),
+            build_errors: BuildErrors::new(),
+            supergraph_was_updated: false,
+            subgraph_was_created: false,
+            subgraph_was_updated: false,
+            launch_url: None,
+            launch_cli_copy: None,
+        };
+        let actual_json: JsonOutput = RoverOutput::SubgraphPublishResponse {
+            graph_ref: GraphRef {
+                name: "graph".to_string(),
+                variant: "variant".to_string(),
+            },
+            subgraph: "subgraph".to_string(),
+            publish_response: mock_publish_response,
+        }
+        .into();
+        let expected_json = json!(
+        {
+            "json_version": "1",
+            "data": {
+                "api_schema_hash": "123456",
+                "supergraph_was_updated": false,
+                "subgraph_was_created": false,
+                "subgraph_was_updated": false,
+                "success": true,
+                "launch_url": null,
+                "launch_cli_copy": null,
+            },
+            "error": null
+        });
+        assert_json_eq!(expected_json, actual_json);
+    }
+
     #[test]
     fn profiles_json() {
         let mock_profiles = vec!["default".to_string(), "staging".to_string()];