arche 2.5.0

An opinionated backend foundation for Axum applications, providing batteries-included integrations for cloud services, databases, authentication, middleware, and logging.
Documentation 
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use serde::Serialize;

#[derive(Debug, Clone)]
pub enum Provider {
    Gemini,
    Anthropic,
}

#[derive(Debug, Clone)]
pub struct GenerateRequest {
    pub provider: Provider,
    pub model: String,
    pub messages: Vec<Message>,
    pub system: Option<String>,
    pub max_tokens: Option<u32>,
    pub temperature: Option<f32>,
    pub top_p: Option<f32>,
    pub top_k: Option<u32>,
    pub tools: Option<Vec<ToolDefinition>>,
}

#[derive(Debug, Clone)]
pub struct Message {
    pub role: Role,
    pub content: Vec<ContentPart>,
}

#[derive(Debug, Clone, PartialEq)]
pub enum Role {
    User,
    Assistant,
}

#[derive(Debug, Clone)]
pub enum ContentPart {
    Text(String),
    ToolCall {
        id: String,
        name: String,
        arguments: serde_json::Value,
    },
    ToolResult {
        tool_call_id: String,
        name: String,
        content: serde_json::Value,
    },
}

#[derive(Debug, Clone, Serialize)]
pub struct ToolDefinition {
    pub name: String,
    pub description: String,
    pub parameters: serde_json::Value,
}

#[derive(Debug, Clone)]
pub struct GenerateResponse {
    pub content: Vec<ContentPart>,
    pub stop_reason: Option<String>,
    pub usage: Option<Usage>,
}

#[derive(Debug, Clone)]
pub struct Usage {
    pub input_tokens: Option<u32>,
    pub output_tokens: Option<u32>,
    pub total_tokens: Option<u32>,
}

#[derive(Debug, Clone)]
pub enum StreamChunk {
    Text(String),
    Done { finish_reason: String },
}

impl Message {
    pub fn user(text: &str) -> Self {
        Self {
            role: Role::User,
            content: vec![ContentPart::Text(text.into())],
        }
    }

    pub fn assistant(text: &str) -> Self {
        Self {
            role: Role::Assistant,
            content: vec![ContentPart::Text(text.into())],
        }
    }

    pub fn tool_result(tool_call_id: &str, name: &str, content: serde_json::Value) -> Self {
        Self {
            role: Role::User,
            content: vec![ContentPart::ToolResult {
                tool_call_id: tool_call_id.into(),
                name: name.into(),
                content,
            }],
        }
    }
}

impl GenerateRequest {
    pub fn new(provider: Provider, model: &str, messages: Vec<Message>) -> Self {
        Self {
            provider,
            model: model.into(),
            messages,
            system: None,
            max_tokens: None,
            temperature: None,
            top_p: None,
            top_k: None,
            tools: None,
        }
    }

    pub fn with_system(mut self, system: &str) -> Self {
        self.system = Some(system.into());
        self
    }

    pub fn with_max_tokens(mut self, max_tokens: u32) -> Self {
        self.max_tokens = Some(max_tokens);
        self
    }

    pub fn with_temperature(mut self, temperature: f32) -> Self {
        self.temperature = Some(temperature);
        self
    }

    pub fn with_top_p(mut self, top_p: f32) -> Self {
        self.top_p = Some(top_p);
        self
    }

    pub fn with_top_k(mut self, top_k: u32) -> Self {
        self.top_k = Some(top_k);
        self
    }

    pub fn with_tools(mut self, tools: Vec<ToolDefinition>) -> Self {
        self.tools = Some(tools);
        self
    }
}

impl GenerateResponse {
    pub fn text(&self) -> Option<String> {
        let text: String = self
            .content
            .iter()
            .filter_map(|p| match p {
                ContentPart::Text(t) => Some(t.as_str()),
                _ => None,
            })
            .collect();

        if text.is_empty() { None } else { Some(text) }
    }

    pub fn tool_calls(&self) -> Vec<&ContentPart> {
        self.content
            .iter()
            .filter(|p| matches!(p, ContentPart::ToolCall { .. }))
            .collect()
    }

    pub fn stop_reason(&self) -> Option<&str> {
        self.stop_reason.as_deref()
    }
}