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//! Non-streaming wrappers: `run_turn` and `run_until_done`.
use std::sync::Arc;
use caliban_provider::{Message, StopReason};
use futures::StreamExt as _;
use tokio_util::sync::CancellationToken;
use crate::agent::Agent;
use crate::error::{Error, Result};
use crate::stream::{RunOutcome, TurnEvent, TurnOutcome};
impl Agent {
/// Run a single provider turn (one provider call plus any tool dispatches)
/// and return the [`TurnOutcome`] once the turn completes.
///
/// # Errors
///
/// Returns [`Error::Cancelled`] if the cancellation token fires,
/// [`Error::Misconfigured`] if the stream closes without emitting a
/// [`TurnEvent::TurnEnd`], or any other [`Error`] variant propagated from
/// the stream.
pub async fn run_turn(
self: Arc<Self>,
messages: Vec<Message>,
cancel: CancellationToken,
) -> Result<TurnOutcome> {
let mut stream = self.stream_until_done(messages, cancel);
while let Some(event) = stream.next().await {
if let TurnEvent::TurnEnd {
assistant_message,
tool_results,
stop_reason,
usage,
..
} = event?
{
return Ok(TurnOutcome {
continue_loop: stop_reason == StopReason::ToolUse,
assistant_message,
tool_results,
stop_reason,
usage,
});
}
}
Err(Error::Misconfigured("stream ended without TurnEnd".into()))
}
/// Drive the agent loop to completion and return the [`RunOutcome`].
///
/// This is the simplest entry point for callers that do not need streaming
/// progress events. It consumes all [`TurnEvent`]s and returns once the
/// stream emits a [`TurnEvent::RunEnd`].
///
/// # Errors
///
/// Returns [`Error::Cancelled`] if the cancellation token fires,
/// [`Error::Misconfigured`] if the stream closes without emitting a
/// [`TurnEvent::RunEnd`], or any other [`Error`] variant propagated from
/// the stream.
pub async fn run_until_done(
self: Arc<Self>,
messages: Vec<Message>,
cancel: CancellationToken,
) -> Result<RunOutcome> {
let mut stream = self.stream_until_done(messages, cancel);
while let Some(event) = stream.next().await {
if let TurnEvent::RunEnd {
final_messages,
total_usage,
turn_count,
stopped_for,
} = event?
{
return Ok(RunOutcome {
final_messages,
turn_count,
total_usage,
stopped_for,
});
}
}
Err(Error::Misconfigured("stream ended without RunEnd".into()))
}
}
// ---------------------------------------------------------------------------
// Tests
// ---------------------------------------------------------------------------
#[cfg(test)]
mod tests {
use std::sync::Arc;
use caliban_provider::Message;
use tokio_util::sync::CancellationToken;
use crate::stream::StopCondition;
#[test]
fn stop_condition_variants_accessible() {
// Ensure StopCondition variants used in RunOutcome are reachable.
let _ = StopCondition::EndOfTurn;
let _ = StopCondition::Cancelled;
}
#[test]
fn cancellation_token_can_be_created() {
let cancel = CancellationToken::new();
assert!(!cancel.is_cancelled());
}
/// Compile-time assertion: verify `run_turn` and `run_until_done` have the
/// correct `Arc<Self>` receiver and parameter types. This function is never
/// called; it just must compile.
#[allow(dead_code)]
fn _assert_method_signatures() {
use crate::agent::Agent;
use crate::error::Result;
use crate::stream::{RunOutcome, TurnOutcome};
let _: fn(Arc<Agent>, Vec<Message>, CancellationToken) -> _ =
|agent, msgs, cancel| agent.run_turn(msgs, cancel);
let _: fn(Arc<Agent>, Vec<Message>, CancellationToken) -> _ =
|agent, msgs, cancel| agent.run_until_done(msgs, cancel);
let _: Option<Result<TurnOutcome>> = None;
let _: Option<Result<RunOutcome>> = None;
}
}