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[router] Support complex assistant and tool messages in /chat/completions (#12860)

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Co-authored-by: Chang Su <chang.s.su@oracle.com>
Co-authored-by: Simo Lin <linsimo.mark@gmail.com>
This commit is contained in:
Danylo Vashchilenko
2025-11-12 00:14:15 -08:00
committed by GitHub
co-authored by Chang Su Simo Lin
parent ad8d24c39e
commit d28caaf60a
13 changed files with 127 additions and 104 deletions
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sgl-router/src/routers/grpc/harmony/builder.rs
+10 -6
View File
@@ -16,7 +16,7 @@ use tracing::debug;
use super::types::HarmonyBuildOutput;
use crate::protocols::{
chat::{ChatCompletionRequest, ChatMessage, UserMessageContent},
chat::{ChatCompletionRequest, ChatMessage, MessageContent},
common::{ContentPart, Tool},
responses::{
ReasoningEffort as ResponsesReasoningEffort, ResponseContentPart, ResponseInput,
@@ -704,7 +704,7 @@ impl HarmonyBuilder {
},
recipient: None,
content: vec![Content::Text(TextContent {
text: content.clone(),
text: content.to_simple_string(),
})],
channel: None,
content_type: None,
@@ -715,8 +715,8 @@ impl HarmonyBuilder {
ChatMessage::User { content, name } => {
// Extract text from user content
let text = match content {
UserMessageContent::Text(text) => text.clone(),
UserMessageContent::Parts(parts) => {
MessageContent::Text(text) => text.clone(),
MessageContent::Parts(parts) => {
// For multimodal content, extract text parts
parts
.iter()
@@ -772,7 +772,11 @@ impl HarmonyBuilder {
} else {
// Regular assistant message with content
// Combine content with reasoning if present
let mut text = content.clone().unwrap_or_default();
let mut text = content
.as_ref()
.map(|c| c.to_simple_string())
.unwrap_or_default();
if let Some(reasoning) = reasoning_content {
if !text.is_empty() {
text.push('\n');
@@ -813,7 +817,7 @@ impl HarmonyBuilder {
},
recipient: Some("assistant".to_string()),
content: vec![Content::Text(TextContent {
text: content.clone(),
text: content.to_simple_string(),
})],
channel: None,
content_type: None,
sgl-router/src/routers/grpc/regular/responses/conversions.rs
+9 -9
View File
@@ -9,7 +9,7 @@
use crate::{
protocols::{
chat::{ChatCompletionRequest, ChatCompletionResponse, ChatMessage, UserMessageContent},
chat::{ChatCompletionRequest, ChatCompletionResponse, ChatMessage, MessageContent},
common::{
FunctionCallResponse, JsonSchemaFormat, ResponseFormat, StreamOptions, ToolCall,
UsageInfo,
@@ -38,7 +38,7 @@ pub fn responses_to_chat(req: &ResponsesRequest) -> Result<ChatCompletionRequest
// 1. Add system message if instructions provided
if let Some(instructions) = &req.instructions {
messages.push(ChatMessage::System {
content: instructions.clone(),
content: MessageContent::Text(instructions.clone()),
name: None,
});
}
@@ -48,7 +48,7 @@ pub fn responses_to_chat(req: &ResponsesRequest) -> Result<ChatCompletionRequest
ResponseInput::Text(text) => {
// Simple text input → user message
messages.push(ChatMessage::User {
content: UserMessageContent::Text(text.clone()),
content: MessageContent::Text(text.clone()),
name: None,
});
}
@@ -111,7 +111,7 @@ pub fn responses_to_chat(req: &ResponsesRequest) -> Result<ChatCompletionRequest
// Add tool result message if output exists
if let Some(output_text) = output {
messages.push(ChatMessage::Tool {
content: output_text.clone(),
content: MessageContent::Text(output_text.clone()),
tool_call_id: id.clone(),
});
}
@@ -140,7 +140,7 @@ pub fn responses_to_chat(req: &ResponsesRequest) -> Result<ChatCompletionRequest
// Note: The function name is looked up from prev_outputs in Harmony path
// For Chat path, we just use the call_id
messages.push(ChatMessage::Tool {
content: output.clone(),
content: MessageContent::Text(output.clone()),
tool_call_id: call_id.clone(),
});
}
@@ -213,23 +213,23 @@ fn extract_text_from_content(content: &[ResponseContentPart]) -> String {
fn role_to_chat_message(role: &str, text: String) -> ChatMessage {
match role {
"user" => ChatMessage::User {
content: UserMessageContent::Text(text),
content: MessageContent::Text(text),
name: None,
},
"assistant" => ChatMessage::Assistant {
content: Some(text),
content: Some(MessageContent::Text(text)),
name: None,
tool_calls: None,
reasoning_content: None,
},
"system" => ChatMessage::System {
content: text,
content: MessageContent::Text(text),
name: None,
},
_ => {
// Unknown role, treat as user message
ChatMessage::User {
content: UserMessageContent::Text(text),
content: MessageContent::Text(text),
name: None,
}
}
sgl-router/src/routers/grpc/utils.rs
+9 -9
View File
@@ -948,7 +948,7 @@ mod tests {
use super::*;
use crate::{
protocols::{
chat::{ChatMessage, UserMessageContent},
chat::{ChatMessage, MessageContent},
common::{ContentPart, ImageUrl},
},
tokenizer::chat_template::ChatTemplateContentFormat,
@@ -957,7 +957,7 @@ mod tests {
#[test]
fn test_transform_messages_string_format() {
let messages = vec![ChatMessage::User {
content: UserMessageContent::Parts(vec![
content: MessageContent::Parts(vec![
ContentPart::Text {
text: "Hello".to_string(),
},
@@ -990,7 +990,7 @@ mod tests {
#[test]
fn test_transform_messages_openai_format() {
let messages = vec![ChatMessage::User {
content: UserMessageContent::Parts(vec![
content: MessageContent::Parts(vec![
ContentPart::Text {
text: "Describe this image:".to_string(),
},
@@ -1024,7 +1024,7 @@ mod tests {
#[test]
fn test_transform_messages_simple_string_content() {
let messages = vec![ChatMessage::User {
content: UserMessageContent::Text("Simple text message".to_string()),
content: MessageContent::Text("Simple text message".to_string()),
name: None,
}];
@@ -1044,11 +1044,11 @@ mod tests {
fn test_transform_messages_multiple_messages() {
let messages = vec![
ChatMessage::System {
content: "System prompt".to_string(),
content: MessageContent::Text("System prompt".to_string()),
name: None,
},
ChatMessage::User {
content: UserMessageContent::Parts(vec![
content: MessageContent::Parts(vec![
ContentPart::Text {
text: "User message".to_string(),
},
@@ -1079,7 +1079,7 @@ mod tests {
#[test]
fn test_transform_messages_empty_text_parts() {
let messages = vec![ChatMessage::User {
content: UserMessageContent::Parts(vec![ContentPart::ImageUrl {
content: MessageContent::Parts(vec![ContentPart::ImageUrl {
image_url: ImageUrl {
url: "https://example.com/image.jpg".to_string(),
detail: None,
@@ -1101,11 +1101,11 @@ mod tests {
fn test_transform_messages_mixed_content_types() {
let messages = vec![
ChatMessage::User {
content: UserMessageContent::Text("Plain text".to_string()),
content: MessageContent::Text("Plain text".to_string()),
name: None,
},
ChatMessage::User {
content: UserMessageContent::Parts(vec![
content: MessageContent::Parts(vec![
ContentPart::Text {
text: "With image".to_string(),
},
sgl-router/src/routers/http/pd_router.rs
+4 -4
View File
@@ -23,7 +23,7 @@ use crate::{
metrics::RouterMetrics,
policies::{LoadBalancingPolicy, PolicyRegistry},
protocols::{
chat::{ChatCompletionRequest, ChatMessage, UserMessageContent},
chat::{ChatCompletionRequest, ChatMessage, MessageContent},
classify::ClassifyRequest,
common::{InputIds, StringOrArray},
completion::CompletionRequest,
@@ -1099,10 +1099,10 @@ impl RouterTrait for PDRouter {
let request_text = if self.policies_need_request_text() {
body.messages.first().and_then(|msg| match msg {
ChatMessage::User { content, .. } => match content {
UserMessageContent::Text(text) => Some(text.clone()),
UserMessageContent::Parts(_) => None,
MessageContent::Text(text) => Some(text.clone()),
MessageContent::Parts(_) => None,
},
ChatMessage::System { content, .. } => Some(content.clone()),
ChatMessage::System { content, .. } => Some(content.to_simple_string()),
_ => None,
})
} else {