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use std::collections::HashSet;
use crate::types::{
gateway::{ChatCompletionContent, ChatCompletionMessage, ContentType},
message::{MessageType, PromptMessage},
threads::{
AudioDetail, AudioFormat, Message, MessageContentPart, MessageContentPartOptions,
MessageContentType,
},
};
use crate::GatewayError;
pub struct MessageMapper {}
impl MessageMapper {
pub fn map_prompt_message(
messages: &[ChatCompletionMessage],
) -> Result<Vec<PromptMessage>, GatewayError> {
let mut prompt_messages = vec![];
for message in messages.iter() {
if message.role.as_str() == "system" {
let msg = match &message.content {
Some(content) => match content {
ChatCompletionContent::Text(content) => content.clone(),
ChatCompletionContent::Content(content) => {
if content.len() > 1 {
return Err(GatewayError::CustomError(
"System message can only have one content".to_string(),
));
}
let content = content.first().ok_or(GatewayError::CustomError(
"System message content is empty".to_string(),
))?;
match content.r#type {
ContentType::Text => match &content.text {
Some(content) => content.clone(),
None => {
return Err(GatewayError::CustomError(
"System message content is empty".to_string(),
))
}
},
ContentType::ImageUrl => {
return Err(GatewayError::CustomError(
"Image url are not supported for system messages"
.to_string(),
))
}
ContentType::InputAudio => {
return Err(GatewayError::CustomError(
"Input audio are not supported for system messages"
.to_string(),
))
}
}
}
},
None => {
return Err(GatewayError::CustomError(
"System message content is empty".to_string(),
))
}
};
let m = PromptMessage {
r#type: MessageType::SystemMessage,
msg,
wired: false,
parameters: HashSet::new(),
};
prompt_messages.push(m);
}
}
Ok(prompt_messages)
}
pub fn map_completions_message_to_langdb_message(
message: &ChatCompletionMessage,
model_name: &str,
user: &str,
) -> Result<Message, GatewayError> {
let content = if let Some(content) = &message.content {
match content {
ChatCompletionContent::Text(content) => {
if message.cache_control.is_none() {
Some(content.clone())
} else {
None
}
}
ChatCompletionContent::Content(_) => None,
}
} else {
None
};
let content_array = if let Some(content) = &message.content {
match content {
ChatCompletionContent::Text(content) => {
if message.cache_control.is_none() {
Ok(vec![])
} else {
Ok(vec![MessageContentPart {
r#type: MessageContentType::Text,
value: content.clone(),
additional_options: None,
cache_control: message.cache_control.clone(),
}])
}
}
ChatCompletionContent::Content(content) => content
.iter()
.map(|c| {
Ok(match c.r#type {
ContentType::Text => MessageContentPart {
r#type: MessageContentType::Text,
value: c.text.clone().unwrap_or("".to_string()),
additional_options: None,
cache_control: c.cache_control.clone(),
},
ContentType::ImageUrl => MessageContentPart {
r#type: MessageContentType::ImageUrl,
value: c
.image_url
.clone()
.map(|url| url.url.clone())
.unwrap_or("".to_string()),
additional_options: None,
cache_control: c.cache_control.clone(),
},
ContentType::InputAudio => {
let audio = c.audio.as_ref().ok_or(GatewayError::CustomError(
"Audio data is empty".to_string(),
))?;
MessageContentPart {
r#type: MessageContentType::InputAudio,
value: audio.data.clone(),
additional_options: Some(MessageContentPartOptions::Audio(
AudioDetail {
r#type: match audio.format.as_str() {
"mp3" => AudioFormat::Mp3,
"wav" => AudioFormat::Wav,
f => {
return Err(GatewayError::CustomError(format!(
"Unsupported audio format {f}"
)))
}
},
},
)),
cache_control: c.cache_control.clone(),
}
}
})
})
.collect::<Result<Vec<MessageContentPart>, GatewayError>>(),
}
} else {
Ok(vec![])
};
Ok(Message {
model_name: model_name.to_string(),
thread_id: None,
user_id: user.to_string(),
content_type: MessageContentType::Text,
content: content.clone(),
content_array: content_array?,
r#type: Self::map_role_to_message_type(message.role.as_str()),
tool_calls: message.tool_calls.clone(),
tool_call_id: message.tool_call_id.clone(),
})
}
pub fn map_role_to_message_type(role: &str) -> MessageType {
match role {
"system" => MessageType::SystemMessage,
"assistant" | "ai" => MessageType::AIMessage,
"user" => MessageType::HumanMessage,
"tool" => MessageType::ToolResult,
_ => MessageType::HumanMessage,
}
}
}