chenhg5/cc-connect · error

googlechat: SendImage: invalid reply context type %T

Error message

googlechat: SendImage: invalid reply context type %T

What it means

SendImage expects its reply-context argument to be the concrete type googlechat.replyContext. Because the core.ImageSender interface passes it as any, a context created by another platform (or any other value) fails the type assertion and triggers this error naming the offending dynamic type.

Solutions

1. Only pass the reply context value returned by this googlechat platform (e.g. from Reply/message handling)
2. Add a type assertion/check at the call site before invoking SendImage
3. If writing cross-platform code, obtain rctx from the same platform instance you call SendImage on

Example fix

// before
p.SendImage(ctx, someOtherPlatformCtx, img)
// after
if gcCtx, ok := someOtherPlatformCtx.(googlechat.ReplyContext); ok {
    p.SendImage(ctx, gcCtx, img)
}

func isGoogleChatReplyContext(rctx any) bool { _, ok := rctx.(replyContext); return ok }

if err := p.SendImage(ctx, rctx, img); err != nil {
    var tErr *typeMismatchError
    if errors.As(err, &tErr) { slog.Error("wrong reply context type", "got", fmt.Sprintf("%T", rctx)) }
    return err
}

When it happens

Trigger: Passing a reply context obtained from a different platform's adapter, a nil value, or a manually-built struct of the wrong type into SendImage.

Common situations: Mixing platform adapters in a multi-platform deployment; caching reply contexts across platforms; refactor changing the context type without updating callers.

Understand the failure class

Background: Type mismatch errors: IllegalArgumentException, TypeError and type guards across 150 open-source libraries — this error's family across 150 libraries.

Related errors

• googlechat: SendFile: invalid reply context type %T
• dingtalk: SendImage: invalid reply context type %T
• googlechat: invalid reply context type %T
• max: unexpected replyCtx type %T
• qqbot: invalid reply context

AI-assisted analysis of chenhg5/cc-connect@4000b2338a (2026-09-06). Data as JSON: /api/errors/dcd96dd1b3a6dfac. Report an issue: GitHub.

Appendix: source

Thrown at platform/googlechat/googlechat.go:564

	if err != nil {
		return err
	}
	if _, err := io.Copy(io.Discard, resp.Body); err != nil {
		_ = resp.Body.Close()
		return fmt.Errorf("googlechat: drain attachment create response body: %w", err)
	}
	if err := resp.Body.Close(); err != nil {
		return fmt.Errorf("googlechat: close attachment create response body: %w", err)
	}
	return nil
}

// SendImage uploads an image and posts it as a Chat message attachment.
// Implements core.ImageSender.
func (p *Platform) SendImage(ctx context.Context, rctx any, img core.ImageAttachment) error {
	rc, ok := rctx.(replyContext)
	if !ok {
		return fmt.Errorf("googlechat: SendImage: invalid reply context type %T", rctx)
	}
	return p.postAttachment(ctx, rc,
		coalesce(img.FileName, "image.png"),
		coalesce(img.MimeType, "image/png"),
		img.Data)
}

// SendFile uploads a file and posts it as a Chat message attachment.
// Implements core.FileSender.
func (p *Platform) SendFile(ctx context.Context, rctx any, file core.FileAttachment) error {
	rc, ok := rctx.(replyContext)
	if !ok {
		return fmt.Errorf("googlechat: SendFile: invalid reply context type %T", rctx)
	}
	return p.postAttachment(ctx, rc,
		coalesce(file.FileName, "attachment"),
		coalesce(file.MimeType, "application/octet-stream"),
		file.Data)

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