10 A change, through both images

Build it yourself. Read the tutorial is the other way to read this part.

This walk goes through rahuldave/cheesecracker on GitHub. This part starts from the code at step-09. The code before this part

If you start at this part, make your clone as Get the project says, and then run this command. It puts in your clone the files that this part starts from. A file that the project deleted before this part stays, so delete it if git check lists it:

git fetch --quiet --tags --force origin; git rm -rq --cached --ignore-unmatch -- :/ && git restore --source step-09 --staged --worktree -- :/

A change of the code goes through both images. The dev image checks it, and the run image has to be built again.

just setup

The Cheese App needs to add two numbers. The endpoint /add/ takes x and y, and returns their sum. An integration test calls it. Then every check of the project runs again, on this machine, in the dev image, and against a new run image.

Apply the patch to src/api-service/api/service.py, from the top of the project:

curl -fsSL https://github.com/rahuldave/cheesecracker/compare/0701e9244ab2384538eda4d623e1d047ff3f8258...e706255d9c0fee3b6fded40376e7ac8829d1654a.diff | git apply --include=src/api-service/api/service.py

Apply the patch to tests/integration/test_api.py, from the top of the project:

curl -fsSL https://github.com/rahuldave/cheesecracker/compare/0701e9244ab2384538eda4d623e1d047ff3f8258...e706255d9c0fee3b6fded40376e7ac8829d1654a.diff | git apply --include=tests/integration/test_api.py

Apply both patches. Read the function add_numbers() at the end of service.py, and test_add_endpoint() at the end of test_api.py.

just check

The checks pass on this machine. The integration tests are now eleven.

just docker-test

The same checks pass in the dev image.

The run image still has the old code, because an image is built once and does not change. Build it again, and start its server.

just docker-build run
just docker-serve
curl -s "localhost:9000/add/?x=10&y=20"

The server in Docker answers {"result":30.0}.

just test-system -q

The system tests print 5 passed against the new run image.

just docker-stop

Check your files against this part. The command prints nothing when they match, and otherwise shows what differs:

git check e706255d9c0f

If you are stuck, this command puts the files of this part in place of yours. A file that you made yourself stays:

git fetch --quiet --tags --force origin; git restore --source step-09 --staged -- :/ && git restore --source step-10 --staged --worktree -- :/

@@ -44,3 +44,9 @@ async def calculate_euclidean_distance(x: float = 1, y: float = 2):
         "distance": result,
         "message": "This is a very long line that exceeds 120 characters blah",
     }
+
+
+@app.get("/add/")
+async def add_numbers(x: float = 0, y: float = 0):
+    """Add two numbers"""
+    return {"result": x + y}

@@ -87,3 +87,9 @@ async def test_api_health_check():
     assert response.status_code == 200
     # API should respond quickly
     assert response.elapsed.total_seconds() < 1 if hasattr(response, "elapsed") else True
+
+
+def test_add_endpoint():
+    response = client.get("/add/?x=10&y=20")
+    assert response.status_code == 200
+    assert response.json()["result"] == 30