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//! Adapter from LlmClient to AgentLlmClient.
use async_trait::async_trait;
use futures::StreamExt;
use meerkat_core::schema::{CompiledSchema, SchemaError};
use meerkat_core::{
AgentError, AgentEvent, AgentLlmClient, LlmStreamResult, Message, OutputSchema, StopReason,
ToolDef, Usage,
};
use serde_json::Value;
use std::sync::Arc;
use tokio::sync::mpsc;
use crate::block_assembler::BlockAssembler;
use crate::types::{LlmClient, LlmDoneOutcome, LlmEvent, LlmRequest};
/// Shared adapter for streaming LLM clients.
#[derive(Clone)]
pub struct LlmClientAdapter {
client: Arc<dyn LlmClient>,
model: String,
/// Optional channel to emit streaming text deltas.
event_tx: Option<mpsc::Sender<AgentEvent>>,
/// Provider-specific parameters to pass with every request.
provider_params: Option<Value>,
/// Per-interaction event tap for streaming events to subscribers.
event_tap: meerkat_core::EventTap,
}
impl LlmClientAdapter {
pub fn new(client: Arc<dyn LlmClient>, model: String) -> Self {
Self {
client,
model,
event_tx: None,
provider_params: None,
event_tap: meerkat_core::new_event_tap(),
}
}
/// Create an adapter with streaming event support.
pub fn with_event_channel(
client: Arc<dyn LlmClient>,
model: String,
event_tx: mpsc::Sender<AgentEvent>,
) -> Self {
Self {
client,
model,
event_tx: Some(event_tx),
provider_params: None,
event_tap: meerkat_core::new_event_tap(),
}
}
/// Set provider-specific parameters to pass with every request.
pub fn with_provider_params(mut self, params: Option<Value>) -> Self {
self.provider_params = params;
self
}
/// Set the event tap for interaction-scoped streaming.
pub fn with_event_tap(mut self, tap: meerkat_core::EventTap) -> Self {
self.event_tap = tap;
self
}
}
#[allow(clippy::unwrap_used, clippy::expect_used)]
fn fallback_raw_value() -> Box<serde_json::value::RawValue> {
serde_json::value::RawValue::from_string("{}".to_string()).expect("static JSON is valid")
}
#[async_trait]
impl AgentLlmClient for LlmClientAdapter {
async fn stream_response(
&self,
messages: &[Message],
tools: &[Arc<ToolDef>],
max_tokens: u32,
temperature: Option<f32>,
provider_params: Option<&Value>,
) -> Result<LlmStreamResult, AgentError> {
let effective_params = provider_params
.cloned()
.or_else(|| self.provider_params.clone());
let request = LlmRequest {
model: self.model.clone(),
messages: messages.to_vec(),
tools: tools.to_vec(),
max_tokens,
temperature,
stop_sequences: None,
provider_params: effective_params,
};
let mut stream = self.client.stream(&request);
let mut assembler = BlockAssembler::new();
let mut reasoning_started = false;
let mut stop_reason = StopReason::EndTurn;
let mut usage = Usage::default();
while let Some(result) = stream.next().await {
match result {
Ok(event) => match event {
LlmEvent::TextDelta { delta, meta } => {
assembler.on_text_delta(&delta, meta);
meerkat_core::tap_try_send(
&self.event_tap,
&AgentEvent::TextDelta {
delta: delta.clone(),
},
);
if let Some(ref tx) = self.event_tx {
let _ = tx.send(AgentEvent::TextDelta { delta }).await;
}
}
LlmEvent::ReasoningDelta { delta } => {
if !reasoning_started {
reasoning_started = true;
assembler.on_reasoning_start();
}
if let Err(e) = assembler.on_reasoning_delta(&delta) {
tracing::warn!(?e, "orphaned reasoning delta");
}
meerkat_core::tap_try_send(
&self.event_tap,
&AgentEvent::ReasoningDelta {
delta: delta.clone(),
},
);
if let Some(ref tx) = self.event_tx {
let _ = tx.send(AgentEvent::ReasoningDelta { delta }).await;
}
}
LlmEvent::ReasoningComplete { text, meta } => {
if !reasoning_started {
assembler.on_reasoning_start();
let _ = assembler.on_reasoning_delta(&text);
}
// Ordering is intentional: snapshot reasoning text before
// `on_reasoning_complete(meta)` because completion may clear
// the internal reasoning buffer.
let reasoning_text = assembler.current_reasoning_text();
assembler.on_reasoning_complete(meta);
reasoning_started = false;
meerkat_core::tap_try_send(
&self.event_tap,
&AgentEvent::ReasoningComplete {
content: reasoning_text.clone(),
},
);
if let Some(ref tx) = self.event_tx {
let _ = tx
.send(AgentEvent::ReasoningComplete {
content: reasoning_text,
})
.await;
}
}
LlmEvent::ToolCallDelta {
id,
name,
args_delta,
} => {
if let Err(e) =
assembler.on_tool_call_delta(&id, name.as_deref(), &args_delta)
{
if matches!(
e,
crate::block_assembler::StreamAssemblyError::OrphanedToolDelta(_)
) {
let _ = assembler.on_tool_call_start(id.clone());
if let Err(e) =
assembler.on_tool_call_delta(&id, name.as_deref(), &args_delta)
{
tracing::warn!(?e, "orphaned tool delta");
}
} else {
tracing::warn!(?e, "tool delta error");
}
}
}
LlmEvent::ToolCallComplete {
id,
name,
args,
meta,
} => {
let effective_meta = meta;
let args_raw = match serde_json::to_string(&args)
.ok()
.and_then(|s| serde_json::value::RawValue::from_string(s).ok())
{
Some(raw) => raw,
None => fallback_raw_value(),
};
let _ = assembler.on_tool_call_complete(id, name, args_raw, effective_meta);
}
LlmEvent::UsageUpdate { usage: u } => {
usage = u;
}
LlmEvent::Done { outcome } => match outcome {
LlmDoneOutcome::Success { stop_reason: sr } => {
stop_reason = sr;
}
LlmDoneOutcome::Error { error } => {
return Err(AgentError::llm(
self.client.provider(),
error.failure_reason(),
error.to_string(),
));
}
},
},
Err(e) => {
return Err(AgentError::llm(
self.client.provider(),
e.failure_reason(),
e.to_string(),
));
}
}
}
Ok(LlmStreamResult::new(
assembler.finalize(),
stop_reason,
usage,
))
}
fn provider(&self) -> &'static str {
self.client.provider()
}
fn compile_schema(&self, output_schema: &OutputSchema) -> Result<CompiledSchema, SchemaError> {
self.client.compile_schema(output_schema)
}
}