refactor: simplify journal logs following, fix corrosion unit name

internal/journal/journal.go

@@ -52,18 +52,18 @@ func logs(ctx context.Context, unit string, opts api.ServiceLogsOptions) (io.Rea
 }
 
 // follow synchronously follows the io.Reader, writing each new journal entry to channel.
-func follow(ctx context.Context, reader io.Reader, outCh chan api.LogEntry) error {
+// It stops when the reader is exhausted or the context is cancelled.
+func follow(ctx context.Context, reader io.Reader, outCh chan api.LogEntry) {
 	scanner := bufio.NewScanner(reader)
 
 	for scanner.Scan() {
 		select {
 		case outCh <- entry(scanner.Bytes()):
 		case <-ctx.Done():
-			return nil
+			return
 		}
 	}
 	if err := scanner.Err(); err != nil {
 		outCh <- api.LogEntry{Err: fmt.Errorf("journal logs: %w", err)}
 	}
-	return nil
 }

internal/journal/logs.go

@@ -1,7 +1,6 @@
 package journal
 
 import (
-	"bufio"
 	"bytes"
 	"context"
 	"fmt"
@@ -16,7 +15,7 @@ func Logs(ctx context.Context, unit string, opts api.ServiceLogsOptions) (<-chan
 	// Hard code unit check for now
 	switch unit {
 	case "uncloud":
-	case "corrosion":
+	case "uncloud-corrosion":
 	case "docker":
 	default:
 		return nil, fmt.Errorf("journal logs: invalid unit: %s", unit)
@@ -29,32 +28,10 @@ func Logs(ctx context.Context, unit string, opts api.ServiceLogsOptions) (<-chan
 
 	outCh := make(chan api.LogEntry)
 
-	switch opts.Follow {
-	case false:
-
-		go func() {
-			defer close(outCh)
-
-			scanner := bufio.NewScanner(reader)
-			for scanner.Scan() {
-				outCh <- entry(scanner.Bytes())
-			}
-
-			if err := scanner.Err(); err != nil {
-				outCh <- api.LogEntry{Err: fmt.Errorf("journal logs: %w", err)}
-			}
-		}()
-
-	case true:
-		go func() {
-			defer close(outCh)
-
-			err := follow(ctx, reader, outCh)
-			if err != nil {
-				outCh <- api.LogEntry{Err: fmt.Errorf("journal logs: %w", err)}
-			}
-		}()
-	}
+	go func() {
+		defer close(outCh)
+		follow(ctx, reader, outCh)
+	}()
 
 	return outCh, nil
 }

internal/journal/logs_test.go

@@ -12,8 +12,6 @@ import (
 )
 
 func TestLogs(t *testing.T) {
-	t.Parallel()
-
 	commandContext = func(ctx context.Context, _ string, _ ...string) *exec.Cmd {
 		return exec.CommandContext(ctx, "/usr/bin/tail", "testdata/logs")
 	}
@@ -29,8 +27,7 @@ func TestLogs(t *testing.T) {
 	for range ch {
 		i++
 	}
-	assert.Equal(t, i, 6)
-	cancel()
+	assert.Equal(t, 6, i)
 
 	commandContext = func(ctx context.Context, _ string, _ ...string) *exec.Cmd {
 		return exec.CommandContext(ctx, "/usr/bin/tail", "-f", "testdata/logs")
@@ -47,5 +44,6 @@ func TestLogs(t *testing.T) {
 	for range ch {
 		i++
 	}
-	assert.Equal(t, i, 6) // still six is hardbeats are not written here.
+	// Still six because heartbeats are not written here and Tail is ignored as the command is overridden.
+	assert.Equal(t, 6, i)
 }