periplon 0.2.0

Rust SDK for building multi-agent AI workflows and automation
Documentation 
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use serde::{Deserialize, Serialize};

/// Main message enum (discriminated union)
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type")]
pub enum Message {
    #[serde(rename = "user")]
    User(UserMessage),
    #[serde(rename = "assistant")]
    Assistant(AssistantMessage),
    #[serde(rename = "system")]
    System(SystemMessage),
    #[serde(rename = "result")]
    Result(ResultMessage),
    #[serde(rename = "stream_event")]
    StreamEvent(StreamEventMessage),
}

impl Message {
    pub fn user(content: impl Into<String>) -> Self {
        Message::User(UserMessage {
            message: UserMessageContent {
                role: "user".to_string(),
                content: ContentValue::Text(content.into()),
            },
            parent_tool_use_id: None,
        })
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UserMessage {
    pub message: UserMessageContent,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub parent_tool_use_id: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UserMessageContent {
    pub role: String,
    pub content: ContentValue,
}

/// Content can be either string or array of blocks
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(untagged)]
pub enum ContentValue {
    Text(String),
    Blocks(Vec<ContentBlock>),
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AssistantMessage {
    pub message: AssistantMessageContent,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub parent_tool_use_id: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AssistantMessageContent {
    pub model: String,
    pub content: Vec<ContentBlock>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SystemMessage {
    pub subtype: String,
    pub data: serde_json::Value,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResultMessage {
    pub subtype: String,
    pub duration_ms: u64,
    pub duration_api_ms: u64,
    pub is_error: bool,
    pub num_turns: u32,
    pub session_id: String,
    pub total_cost_usd: Option<f64>,
    pub usage: Option<serde_json::Value>,
    pub result: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StreamEventMessage {
    pub uuid: String,
    pub session_id: String,
    pub event: serde_json::Value,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub parent_tool_use_id: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type")]
pub enum ContentBlock {
    #[serde(rename = "text")]
    Text { text: String },

    #[serde(rename = "thinking")]
    Thinking { thinking: String, signature: String },

    #[serde(rename = "tool_use")]
    ToolUse {
        id: String,
        name: String,
        input: serde_json::Value,
    },

    #[serde(rename = "tool_result")]
    ToolResult {
        tool_use_id: String,
        #[serde(skip_serializing_if = "Option::is_none")]
        content: Option<serde_json::Value>,
        #[serde(skip_serializing_if = "Option::is_none")]
        is_error: Option<bool>,
    },
}

/// Parse a JSON value into a Message
pub fn parse_message(value: serde_json::Value) -> crate::error::Result<Message> {
    serde_json::from_value(value).map_err(|e| crate::error::Error::ParseError(e.to_string()))
}