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use super::message::{Message, MessageContent};
use crate::utils::count_tokens;
use anyhow::{bail, Result};
use serde::{Deserialize, Deserializer};
const PER_MESSAGES_TOKENS: usize = 5;
const BASIS_TOKENS: usize = 2;
#[derive(Debug, Clone)]
pub struct Model {
pub client_name: String,
pub name: String,
pub max_input_tokens: Option<usize>,
pub max_output_tokens: Option<isize>,
pub extra_fields: Option<serde_json::Map<String, serde_json::Value>>,
pub capabilities: ModelCapabilities,
}
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(),
extra_fields: None,
max_input_tokens: None,
max_output_tokens: None,
capabilities: ModelCapabilities::Text,
}
}
pub fn find(models: &[Self], value: &str) -> Option<Self> {
let mut model = None;
let (client_name, model_name) = match value.split_once(':') {
Some((client_name, model_name)) => {
if model_name.is_empty() {
(client_name, None)
} else {
(client_name, Some(model_name))
}
}
None => (value, None),
};
match model_name {
Some(model_name) => {
if let Some(found) = models.iter().find(|v| v.id() == value) {
model = Some(found.clone());
} else if let Some(found) = models.iter().find(|v| v.client_name == client_name) {
let mut found = found.clone();
found.name = model_name.to_string();
model = Some(found)
}
}
None => {
if let Some(found) = models.iter().find(|v| v.client_name == client_name) {
model = Some(found.clone());
}
}
}
model
}
pub fn id(&self) -> String {
format!("{}:{}", self.client_name, self.name)
}
pub fn set_capabilities(mut self, capabilities: ModelCapabilities) -> Self {
self.capabilities = capabilities;
self
}
pub fn set_extra_fields(
mut self,
extra_fields: Option<serde_json::Map<String, serde_json::Value>>,
) -> Self {
self.extra_fields = extra_fields;
self
}
pub fn set_max_input_tokens(mut self, max_input_tokens: Option<usize>) -> Self {
match max_input_tokens {
None | Some(0) => self.max_input_tokens = None,
_ => self.max_input_tokens = max_input_tokens,
}
self
}
pub fn set_max_output_tokens(mut self, max_output_tokens: Option<isize>) -> Self {
match max_output_tokens {
None | Some(0) => self.max_output_tokens = None,
_ => self.max_output_tokens = max_output_tokens,
}
self
}
pub fn messages_tokens(&self, messages: &[Message]) -> usize {
messages
.iter()
.map(|v| {
match &v.content {
MessageContent::Text(text) => count_tokens(text),
MessageContent::Array(_) => 0, // TODO
}
})
.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);
if messages[num_messages - 1].role.is_user() {
num_messages * PER_MESSAGES_TOKENS + message_tokens
} else {
(num_messages - 1) * PER_MESSAGES_TOKENS + message_tokens
}
}
pub fn max_input_tokens_limit(&self, messages: &[Message]) -> Result<()> {
let total_tokens = self.total_tokens(messages) + BASIS_TOKENS;
if let Some(max_input_tokens) = self.max_input_tokens {
if total_tokens >= max_input_tokens {
bail!("Exceed max input tokens limit")
}
}
Ok(())
}
pub fn merge_extra_fields(&self, body: &mut serde_json::Value) {
if let (Some(body), Some(extra_fields)) = (body.as_object_mut(), &self.extra_fields) {
for (key, extra_field) in extra_fields {
if body.contains_key(key) {
if let (Some(sub_body), Some(extra_field)) =
(body[key].as_object_mut(), extra_field.as_object())
{
for (subkey, sub_field) in extra_field {
if !sub_body.contains_key(subkey) {
sub_body.insert(subkey.clone(), sub_field.clone());
}
}
}
} else {
body.insert(key.clone(), extra_field.clone());
}
}
}
}
}
pub fn convert_models(client_name: &str, models: &[ModelConfig]) -> Vec<Model> {
models
.iter()
.map(|v| {
Model::new(client_name, &v.name)
.set_capabilities(v.capabilities)
.set_max_input_tokens(v.max_input_tokens)
.set_max_output_tokens(v.max_output_tokens)
.set_extra_fields(v.extra_fields.clone())
})
.collect()
}
#[derive(Debug, Clone, Deserialize)]
pub struct ModelConfig {
pub name: String,
pub max_input_tokens: Option<usize>,
pub max_output_tokens: Option<isize>,
pub extra_fields: Option<serde_json::Map<String, serde_json::Value>>,
#[serde(deserialize_with = "deserialize_capabilities")]
#[serde(default = "default_capabilities")]
pub capabilities: ModelCapabilities,
}
bitflags::bitflags! {
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct ModelCapabilities: u32 {
const Text = 0b00000001;
const Vision = 0b00000010;
}
}
impl From<&str> for ModelCapabilities {
fn from(value: &str) -> Self {
let value = if value.is_empty() { "text" } else { value };
let mut output = ModelCapabilities::empty();
if value.contains("text") {
output |= ModelCapabilities::Text;
}
if value.contains("vision") {
output |= ModelCapabilities::Vision;
}
output
}
}
fn deserialize_capabilities<'de, D>(deserializer: D) -> Result<ModelCapabilities, D::Error>
where
D: Deserializer<'de>,
{
let value: String = Deserialize::deserialize(deserializer)?;
Ok(value.as_str().into())
}
fn default_capabilities() -> ModelCapabilities {
ModelCapabilities::Text
}
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