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VercelFormat

lago_api::sse::vercel

Struct VercelFormat 

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pub struct VercelFormat;
Expand description

Vercel AI SDK compatible SSE format.

Formats events using the Vercel AI SDK UI message stream protocol with lifecycle frames (start-step, text-start, text-delta, text-end, finish-step) and tool streaming. Adds the x-vercel-ai-ui-message-stream: v1 header.

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impl SseFormat for VercelFormat

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fn format(&self, event: &EventEnvelope) -> Vec<SseFrame>

Convert an event envelope into zero or more SSE frames. Read more
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fn done_frame(&self) -> Option<SseFrame>

An optional “done” frame to send when the stream terminates.
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fn extra_headers(&self) -> Vec<(String, String)>

Extra HTTP headers to include in the SSE response (e.g. Vercel’s x-vercel-ai-data-stream header).
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fn name(&self) -> &str

Human-readable name of this format (for logging).

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where T: 'static + ?Sized,

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