Trait ImageResolver 

pub trait ImageResolver: Send + Sync {
    // Required method
    fn resolve_image<'life0, 'async_trait>(
        &'life0 self,
        image_id: Uuid,
    ) -> Pin<Box<dyn Future<Output = Result<Option<ResolvedImage>>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait;
}

Trait for resolving image_file content parts to actual image data

When building LLM messages, image_file content parts contain only a reference (UUID) to an uploaded image. This trait allows resolving those references to actual image data.

Provider-specific formatting

The resolved image data is then converted to provider-specific formats:

OpenAI Vision:

{
  "type": "image_url",
  "image_url": { "url": "data:image/png;base64,..." }
}

Anthropic Vision:

{
  "type": "image",
  "source": { "type": "base64", "media_type": "image/png", "data": "..." }
}

Implementation notes

Implementations should:

• Fetch image data from storage (database, S3, etc.)
• Return base64-encoded data with media type
• Handle missing images gracefully (return None)

Required Methods

fn resolve_image<'life0, 'async_trait>( &'life0 self, image_id: Uuid, ) -> Pin<Box<dyn Future<Output = Result<Option<ResolvedImage>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Resolve an image_file reference to actual image data

Returns None if the image is not found.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors