Try to auto-build python SDK referenced by path (temporalio#519)

* Try to auto-build python SDK referenced by path

* Fix typo

Co-authored-by: Dan Davison <[email protected]>

---------

Co-authored-by: Dan Davison <[email protected]>

sdkbuild/python.go

@@ -74,12 +74,39 @@ func BuildPythonProgram(ctx context.Context, options BuildPythonProgramOptions)
 	versionStr := strconv.Quote(strings.TrimPrefix(options.Version, "v"))
 	if strings.ContainsAny(options.Version, `/\`) {
 		// We expect a dist/ directory with a single whl file present
-		wheels, err := filepath.Glob(filepath.Join(options.Version, "dist/*.whl"))
+		sdkPath, err := filepath.Abs(options.Version)
+		if err != nil {
+			return nil, fmt.Errorf("unable to make sdk path absolute: %w", err)
+		}
+		triedBuilding := false
+
+	getWheels:
+		wheels, err := filepath.Glob(filepath.Join(sdkPath, "dist/*.whl"))
 		if err != nil {
 			return nil, fmt.Errorf("failed glob wheel lookup: %w", err)
+		} else if len(wheels) == 0 && !triedBuilding {
+			triedBuilding = true
+			// Try to build the project
+			cmd := exec.CommandContext(ctx, "poetry", "install", "--no-root")
+			cmd.Dir = sdkPath
+			cmd.Stdin, cmd.Stdout, cmd.Stderr = os.Stdin, os.Stdout, os.Stderr
+			err = cmd.Run()
+			if err != nil {
+				return nil, fmt.Errorf("problem installing deps when building sdk by path: %w", err)
+			}
+			cmd = exec.CommandContext(ctx, "poetry", "build")
+			cmd.Dir = sdkPath
+			cmd.Stdin, cmd.Stdout, cmd.Stderr = os.Stdin, os.Stdout, os.Stderr
+			err = cmd.Run()
+			if err != nil {
+				return nil, fmt.Errorf("problem buildling sdk by path: %w", err)
+			}
+			// This constitutes a legitimate use of goto, fight me.
+			goto getWheels
 		} else if len(wheels) != 1 {
-			return nil, fmt.Errorf("expected single dist wheel, found %v", wheels)
+			return nil, fmt.Errorf("expected single dist wheel, found %v - consider cleaning dist dir", wheels)
 		}
+
 		absWheel, err := filepath.Abs(wheels[0])
 		if err != nil {
 			return nil, fmt.Errorf("unable to make wheel path absolute: %w", err)