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use crate::endpoint::realtime_websocket::protocol_common::parse_realtime_payload;
use crate::endpoint::realtime_websocket::protocol_common::parse_session_updated_event;
use crate::endpoint::realtime_websocket::protocol_common::parse_transcript_delta_event;
use crate::endpoint::realtime_websocket::protocol_common::parse_transcript_done_event;
use codex_protocol::protocol::RealtimeAudioFrame;
use codex_protocol::protocol::RealtimeEvent;
use codex_protocol::protocol::RealtimeHandoffRequested;
use codex_protocol::protocol::RealtimeInputAudioSpeechStarted;
use codex_protocol::protocol::RealtimeNoopRequested;
use codex_protocol::protocol::RealtimeResponseCancelled;
use codex_protocol::protocol::RealtimeResponseCreated;
use codex_protocol::protocol::RealtimeResponseDone;
use serde_json::Map as JsonMap;
use serde_json::Value;
use tracing::debug;
const BACKGROUND_AGENT_TOOL_NAME: &str = "background_agent";
const SILENCE_TOOL_NAME: &str = "remain_silent";
const DEFAULT_AUDIO_SAMPLE_RATE: u32 = 24_000;
const DEFAULT_AUDIO_CHANNELS: u16 = 1;
const TOOL_ARGUMENT_KEYS: [&str; 5] = ["input_transcript", "input", "text", "prompt", "query"];
pub(super) fn parse_realtime_event_v2(payload: &str) -> Option<RealtimeEvent> {
let (parsed, message_type) = parse_realtime_payload(payload, "realtime v2")?;
match message_type.as_str() {
"session.updated" => parse_session_updated_event(&parsed),
"response.output_audio.delta" | "response.audio.delta" => {
parse_output_audio_delta_event(&parsed)
}
"conversation.item.input_audio_transcription.delta" => {
parse_transcript_delta_event(&parsed, "delta").map(RealtimeEvent::InputTranscriptDelta)
}
"conversation.item.input_audio_transcription.completed" => {
parse_transcript_done_event(&parsed, "transcript")
.map(RealtimeEvent::InputTranscriptDone)
}
"response.output_text.delta" | "response.output_audio_transcript.delta" => {
parse_transcript_delta_event(&parsed, "delta").map(RealtimeEvent::OutputTranscriptDelta)
}
"response.output_text.done" => {
parse_transcript_done_event(&parsed, "text").map(RealtimeEvent::OutputTranscriptDone)
}
"response.output_audio_transcript.done" => {
parse_transcript_done_event(&parsed, "transcript")
.map(RealtimeEvent::OutputTranscriptDone)
}
"input_audio_buffer.speech_started" => Some(RealtimeEvent::InputAudioSpeechStarted(
RealtimeInputAudioSpeechStarted {
item_id: parsed
.get("item_id")
.and_then(Value::as_str)
.map(str::to_string),
},
)),
"conversation.item.added" | "conversation.item.created" => parsed
.get("item")
.cloned()
.map(RealtimeEvent::ConversationItemAdded),
"conversation.item.done" => parse_conversation_item_done_event(&parsed),
"response.created" => Some(RealtimeEvent::ResponseCreated(RealtimeResponseCreated {
response_id: parse_response_event_response_id(&parsed),
})),
"response.cancelled" => Some(RealtimeEvent::ResponseCancelled(
RealtimeResponseCancelled {
response_id: parse_response_event_response_id(&parsed),
},
)),
"response.done" => Some(RealtimeEvent::ResponseDone(RealtimeResponseDone {
response_id: parse_response_event_response_id(&parsed),
})),
"error" => parse_error_event(&parsed),
_ => {
debug!("received unsupported realtime v2 event type: {message_type}, data: {payload}");
None
}
}
}
fn parse_response_event_response_id(parsed: &Value) -> Option<String> {
parsed
.get("response")
.and_then(Value::as_object)
.and_then(|response| response.get("id"))
.and_then(Value::as_str)
.map(str::to_string)
.or_else(|| {
parsed
.get("response_id")
.and_then(Value::as_str)
.map(str::to_string)
})
}
fn parse_output_audio_delta_event(parsed: &Value) -> Option<RealtimeEvent> {
let data = parsed
.get("delta")
.and_then(Value::as_str)
.map(str::to_string)?;
let sample_rate = parsed
.get("sample_rate")
.and_then(Value::as_u64)
.and_then(|value| u32::try_from(value).ok())
.unwrap_or(DEFAULT_AUDIO_SAMPLE_RATE);
let num_channels = parsed
.get("channels")
.or_else(|| parsed.get("num_channels"))
.and_then(Value::as_u64)
.and_then(|value| u16::try_from(value).ok())
.unwrap_or(DEFAULT_AUDIO_CHANNELS);
Some(RealtimeEvent::AudioOut(RealtimeAudioFrame {
data,
sample_rate,
num_channels,
samples_per_channel: parsed
.get("samples_per_channel")
.and_then(Value::as_u64)
.and_then(|value| u32::try_from(value).ok()),
item_id: parsed
.get("item_id")
.and_then(Value::as_str)
.map(str::to_string),
}))
}
fn parse_conversation_item_done_event(parsed: &Value) -> Option<RealtimeEvent> {
let item = parsed.get("item")?.as_object()?;
if let Some(handoff) = parse_handoff_requested_event(item) {
return Some(handoff);
}
if let Some(noop) = parse_noop_requested_event(item) {
return Some(noop);
}
item.get("id")
.and_then(Value::as_str)
.map(str::to_string)
.map(|item_id| RealtimeEvent::ConversationItemDone { item_id })
}
fn parse_handoff_requested_event(item: &JsonMap<String, Value>) -> Option<RealtimeEvent> {
let item_type = item.get("type").and_then(Value::as_str);
let item_name = item.get("name").and_then(Value::as_str);
if item_type != Some("function_call") || item_name != Some(BACKGROUND_AGENT_TOOL_NAME) {
return None;
}
let call_id = item
.get("call_id")
.and_then(Value::as_str)
.or_else(|| item.get("id").and_then(Value::as_str))?;
let item_id = item
.get("id")
.and_then(Value::as_str)
.unwrap_or(call_id)
.to_string();
let arguments = item.get("arguments").and_then(Value::as_str).unwrap_or("");
Some(RealtimeEvent::HandoffRequested(RealtimeHandoffRequested {
handoff_id: call_id.to_string(),
item_id,
input_transcript: extract_input_transcript(arguments),
active_transcript: Vec::new(),
}))
}
fn parse_noop_requested_event(item: &JsonMap<String, Value>) -> Option<RealtimeEvent> {
let item_type = item.get("type").and_then(Value::as_str);
let item_name = item.get("name").and_then(Value::as_str);
if item_type != Some("function_call") || item_name != Some(SILENCE_TOOL_NAME) {
return None;
}
let call_id = item
.get("call_id")
.and_then(Value::as_str)
.or_else(|| item.get("id").and_then(Value::as_str))?;
let item_id = item
.get("id")
.and_then(Value::as_str)
.unwrap_or(call_id)
.to_string();
Some(RealtimeEvent::NoopRequested(RealtimeNoopRequested {
call_id: call_id.to_string(),
item_id,
}))
}
fn extract_input_transcript(arguments: &str) -> String {
if arguments.is_empty() {
return String::new();
}
if let Ok(arguments_json) = serde_json::from_str::<Value>(arguments)
&& let Some(arguments_object) = arguments_json.as_object()
{
for key in TOOL_ARGUMENT_KEYS {
if let Some(value) = arguments_object.get(key).and_then(Value::as_str) {
let trimmed = value.trim();
if !trimmed.is_empty() {
return trimmed.to_string();
}
}
}
}
arguments.to_string()
}
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