1use std::fmt;
  2use std::sync::Arc;
  3
  4use anyhow::Result;
  5use client::Client;
  6use cloud_api_types::websocket_protocol::MessageToClient;
  7use cloud_llm_client::Plan;
  8use gpui::{App, AppContext as _, Context, Entity, EventEmitter, Global, ReadGlobal as _};
  9use smol::lock::{RwLock, RwLockUpgradableReadGuard, RwLockWriteGuard};
 10use thiserror::Error;
 11
 12#[derive(Error, Debug)]
 13pub struct PaymentRequiredError;
 14
 15impl fmt::Display for PaymentRequiredError {
 16    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 17        write!(
 18            f,
 19            "Payment required to use this language model. Please upgrade your account."
 20        )
 21    }
 22}
 23
 24#[derive(Error, Debug)]
 25pub struct ModelRequestLimitReachedError {
 26    pub plan: Plan,
 27}
 28
 29impl fmt::Display for ModelRequestLimitReachedError {
 30    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 31        let message = match self.plan {
 32            Plan::ZedFree => "Model request limit reached. Upgrade to Zed Pro for more requests.",
 33            Plan::ZedPro => {
 34                "Model request limit reached. Upgrade to usage-based billing for more requests."
 35            }
 36            Plan::ZedProTrial => {
 37                "Model request limit reached. Upgrade to Zed Pro for more requests."
 38            }
 39        };
 40
 41        write!(f, "{message}")
 42    }
 43}
 44
 45#[derive(Clone, Default)]
 46pub struct LlmApiToken(Arc<RwLock<Option<String>>>);
 47
 48impl LlmApiToken {
 49    pub async fn acquire(&self, client: &Arc<Client>) -> Result<String> {
 50        let lock = self.0.upgradable_read().await;
 51        if let Some(token) = lock.as_ref() {
 52            Ok(token.to_string())
 53        } else {
 54            Self::fetch(RwLockUpgradableReadGuard::upgrade(lock).await, client).await
 55        }
 56    }
 57
 58    pub async fn refresh(&self, client: &Arc<Client>) -> Result<String> {
 59        Self::fetch(self.0.write().await, client).await
 60    }
 61
 62    async fn fetch(
 63        mut lock: RwLockWriteGuard<'_, Option<String>>,
 64        client: &Arc<Client>,
 65    ) -> Result<String> {
 66        let system_id = client
 67            .telemetry()
 68            .system_id()
 69            .map(|system_id| system_id.to_string());
 70
 71        let response = client.cloud_client().create_llm_token(system_id).await?;
 72        *lock = Some(response.token.0.clone());
 73        Ok(response.token.0.clone())
 74    }
 75}
 76
 77struct GlobalRefreshLlmTokenListener(Entity<RefreshLlmTokenListener>);
 78
 79impl Global for GlobalRefreshLlmTokenListener {}
 80
 81pub struct RefreshLlmTokenEvent;
 82
 83pub struct RefreshLlmTokenListener;
 84
 85impl EventEmitter<RefreshLlmTokenEvent> for RefreshLlmTokenListener {}
 86
 87impl RefreshLlmTokenListener {
 88    pub fn register(client: Arc<Client>, cx: &mut App) {
 89        let listener = cx.new(|cx| RefreshLlmTokenListener::new(client, cx));
 90        cx.set_global(GlobalRefreshLlmTokenListener(listener));
 91    }
 92
 93    pub fn global(cx: &App) -> Entity<Self> {
 94        GlobalRefreshLlmTokenListener::global(cx).0.clone()
 95    }
 96
 97    fn new(client: Arc<Client>, cx: &mut Context<Self>) -> Self {
 98        client.add_message_to_client_handler({
 99            let this = cx.entity();
100            move |message, cx| {
101                Self::handle_refresh_llm_token(this.clone(), message, cx);
102            }
103        });
104
105        Self
106    }
107
108    fn handle_refresh_llm_token(this: Entity<Self>, message: &MessageToClient, cx: &mut App) {
109        match message {
110            MessageToClient::UserUpdated => {
111                this.update(cx, |_this, cx| cx.emit(RefreshLlmTokenEvent));
112            }
113        }
114    }
115}