llm-connector 0.1.0

A lightweight Rust library for protocol adaptation across multiple LLM providers. Focuses solely on converting between different LLM provider APIs and providing a unified OpenAI-compatible interface.
Documentation 
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//! Streaming types for chat completions

use serde::{Deserialize, Serialize};
use super::response::Usage;
use super::request::ToolCall;

#[cfg(feature = "streaming")]
use futures_util::Stream;
#[cfg(feature = "streaming")]
use std::pin::Pin;

/// Type alias for chat completion streams
#[cfg(feature = "streaming")]
pub type ChatStream = Pin<Box<dyn Stream<Item = Result<StreamingResponse, crate::error::LlmConnectorError>> + Send>>;

/// Streaming chat completion response chunk
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StreamingResponse {
    /// Unique identifier for the completion
    pub id: String,
    
    /// Object type (always "chat.completion.chunk")
    pub object: String,
    
    /// Unix timestamp of creation
    pub created: u64,
    
    /// Model used for the completion
    pub model: String,
    
    /// List of streaming choices
    pub choices: Vec<StreamingChoice>,
    
    /// Usage statistics (only in final chunk)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub usage: Option<Usage>,
    
    /// System fingerprint
    #[serde(skip_serializing_if = "Option::is_none")]
    pub system_fingerprint: Option<String>,
}

/// A streaming completion choice
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StreamingChoice {
    /// Index of the choice
    pub index: u32,
    
    /// The delta (incremental content)
    pub delta: Delta,
    
    /// Reason for finishing (only in final chunk)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub finish_reason: Option<String>,
    
    /// Log probabilities
    #[serde(skip_serializing_if = "Option::is_none")]
    pub logprobs: Option<serde_json::Value>,
}

/// Delta content for streaming
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Delta {
    /// Role of the message (only in first chunk)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub role: Option<String>,
    
    /// Incremental content
    #[serde(skip_serializing_if = "Option::is_none")]
    pub content: Option<String>,
    
    /// Tool calls (for function calling)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tool_calls: Option<Vec<ToolCall>>,
    
    /// Reasoning content (for o1 models)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub reasoning_content: Option<String>,
}

impl Default for Delta {
    fn default() -> Self {
        Self {
            role: None,
            content: None,
            tool_calls: None,
            reasoning_content: None,
        }
    }
}