move MXL retry policy to adapter

internal/playback/source_retry.go

@@ -1,24 +0,0 @@
-package playback
-
-import (
-	"context"
-	"errors"
-	"mxl-player/internal/source"
-)
-
-func shouldRetrySourceError(err error) bool {
-	if errors.Is(err, context.Canceled) {
-		return false
-	}
-
-	switch source.KindOf(err) {
-	case source.ErrorKindInvalidConfig:
-		return false
-	case source.ErrorKindTemporary,
-		source.ErrorKindUnavailable,
-		source.ErrorKindUnknown:
-		return true
-	default:
-		return true
-	}
-}

internal/playback/source_retry_test.go

@@ -1,74 +0,0 @@
-package playback
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"testing"
-
-	"mxl-player/internal/source"
-)
-
-func TestShouldRetrySourceError(t *testing.T) {
-	baseErr := errors.New("source failed")
-	classified := func(kind source.ErrorKind) error {
-		return &source.SourceError{
-			Op:   "read media",
-			Kind: kind,
-			Err:  baseErr,
-		}
-	}
-
-	tests := []struct {
-		name string
-		err  error
-		want bool
-	}{
-		{
-			name: "temporary source error is retryable",
-			err:  classified(source.ErrorKindTemporary),
-			want: true,
-		},
-		{
-			name: "unavailable source is retryable",
-			err:  classified(source.ErrorKindUnavailable),
-			want: true,
-		},
-		{
-			name: "invalid configuration is not retryable",
-			err:  classified(source.ErrorKindInvalidConfig),
-			want: false,
-		},
-		{
-			name: "ordinary unknown error is retryable",
-			err:  baseErr,
-			want: true,
-		},
-		{
-			name: "wrapped invalid configuration is not retryable",
-			err: fmt.Errorf(
-				"worker failed: %w",
-				classified(source.ErrorKindInvalidConfig),
-			),
-			want: false,
-		},
-		{
-			name: "context cancellation is not retryable",
-			err:  context.Canceled,
-			want: false,
-		},
-		{
-			name: "wrapped context cancellation is not retryable",
-			err:  fmt.Errorf("worker stopped: %w", context.Canceled),
-			want: false,
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if got := shouldRetrySourceError(tt.err); got != tt.want {
-				t.Errorf("shouldRetrySourceError() = %t, want %t", got, tt.want)
-			}
-		})
-	}
-}