cmd/osbuild-worker-executor: import verbatim from mvo5/oaas

This commit imports the repository https://github.com/mvo5/oaas
without keeping the history. The history is largely unimportant
and can be looked up in https://github.com/mvo5/oaas/commits/main
if needed.

cmd/osbuild-worker-executor/main_test.go

@@ -0,0 +1,74 @@
+package main_test
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os"
+	"testing"
+	"time"
+
+	logrusTest "github.com/sirupsen/logrus/hooks/test"
+	"github.com/stretchr/testify/assert"
+
+	main "github.com/osbuild/osbuild-composer/cmd/oaas"
+)
+
+const defaultTimeout = 5 * time.Second
+
+func waitReady(ctx context.Context, timeout time.Duration, endpoint string) error {
+	client := http.Client{}
+	startTime := time.Now()
+	for {
+		req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
+		if err != nil {
+			return fmt.Errorf("failed to create request: %w", err)
+		}
+
+		resp, err := client.Do(req)
+		if err != nil {
+			continue
+		}
+		if resp.StatusCode == http.StatusOK {
+			resp.Body.Close()
+			return nil
+		}
+		resp.Body.Close()
+
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+			if time.Since(startTime) >= timeout {
+				return fmt.Errorf("timeout reached while waiting for endpoint")
+			}
+			// wait a little while between checks
+			time.Sleep(250 * time.Millisecond)
+		}
+	}
+}
+
+func runTestServer(t *testing.T) (baseURL, buildBaseDir string, loggerHook *logrusTest.Hook) {
+	host := "localhost"
+	port := "18002"
+	buildBaseDir = t.TempDir()
+	baseURL = fmt.Sprintf("http://%s:%s/", host, port)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	t.Cleanup(cancel)
+
+	loggerHook, restore := main.MockLogger()
+	defer restore()
+
+	args := []string{
+		"-host", host,
+		"-port", port,
+		"-build-path", buildBaseDir,
+	}
+	go main.Run(ctx, args, os.Getenv)
+
+	err := waitReady(ctx, defaultTimeout, baseURL)
+	assert.NoError(t, err)
+
+	return baseURL, buildBaseDir, loggerHook
+}