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use super::message::Message;
use crate::utils::count_tokens;
use anyhow::{bail, Result};
pub type TokensCountFactors = (usize, usize); // (per-messages, bias)
#[derive(Debug, Clone)]
pub struct Model {
pub client_name: String,
pub name: String,
pub max_tokens: Option<usize>,
pub tokens_count_factors: TokensCountFactors,
}
impl Default for Model {
fn default() -> Self {
Model::new("", "")
}
}
impl Model {
pub fn new(client_name: &str, name: &str) -> Self {
Self {
client_name: client_name.into(),
name: name.into(),
max_tokens: None,
tokens_count_factors: Default::default(),
}
}
pub fn id(&self) -> String {
format!("{}:{}", self.client_name, self.name)
}
pub fn set_max_tokens(mut self, max_tokens: Option<usize>) -> Self {
match max_tokens {
None | Some(0) => self.max_tokens = None,
_ => self.max_tokens = max_tokens,
}
self
}
pub fn set_tokens_count_factors(mut self, tokens_count_factors: TokensCountFactors) -> Self {
self.tokens_count_factors = tokens_count_factors;
self
}
pub fn messages_tokens(&self, messages: &[Message]) -> usize {
messages.iter().map(|v| count_tokens(&v.content)).sum()
}
pub fn total_tokens(&self, messages: &[Message]) -> usize {
if messages.is_empty() {
return 0;
}
let num_messages = messages.len();
let message_tokens = self.messages_tokens(messages);
let (per_messages, _) = self.tokens_count_factors;
if messages[num_messages - 1].role.is_user() {
num_messages * per_messages + message_tokens
} else {
(num_messages - 1) * per_messages + message_tokens
}
}
pub fn max_tokens_limit(&self, messages: &[Message]) -> Result<()> {
let (_, bias) = self.tokens_count_factors;
let total_tokens = self.total_tokens(messages) + bias;
if let Some(max_tokens) = self.max_tokens {
if total_tokens >= max_tokens {
bail!("Exceed max tokens limit")
}
}
Ok(())
}
}
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