1use anyhow::{Context as _, Result, anyhow};
2use collections::BTreeMap;
3use credentials_provider::CredentialsProvider;
4use futures::{FutureExt, StreamExt, future::BoxFuture};
5use gpui::{AnyView, App, AsyncApp, Context, Entity, Subscription, Task, Window};
6use http_client::HttpClient;
7use language_model::{
8 AuthenticateError, LanguageModel, LanguageModelCompletionError, LanguageModelCompletionEvent,
9 LanguageModelId, LanguageModelName, LanguageModelProvider, LanguageModelProviderId,
10 LanguageModelProviderName, LanguageModelProviderState, LanguageModelRequest,
11 LanguageModelToolChoice, RateLimiter, Role,
12};
13use menu;
14use open_ai::ResponseStreamEvent;
15use schemars::JsonSchema;
16use serde::{Deserialize, Serialize};
17use settings::{Settings, SettingsStore};
18use std::sync::Arc;
19use strum::IntoEnumIterator;
20use vercel::Model;
21
22use ui::{ElevationIndex, List, Tooltip, prelude::*};
23use ui_input::SingleLineInput;
24use util::ResultExt;
25
26use crate::{AllLanguageModelSettings, ui::InstructionListItem};
27
28const PROVIDER_ID: LanguageModelProviderId = LanguageModelProviderId::new("vercel");
29const PROVIDER_NAME: LanguageModelProviderName = LanguageModelProviderName::new("Vercel");
30
31#[derive(Default, Clone, Debug, PartialEq)]
32pub struct VercelSettings {
33 pub api_url: String,
34 pub available_models: Vec<AvailableModel>,
35}
36
37#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, JsonSchema)]
38pub struct AvailableModel {
39 pub name: String,
40 pub display_name: Option<String>,
41 pub max_tokens: u64,
42 pub max_output_tokens: Option<u64>,
43 pub max_completion_tokens: Option<u64>,
44}
45
46pub struct VercelLanguageModelProvider {
47 http_client: Arc<dyn HttpClient>,
48 state: gpui::Entity<State>,
49}
50
51pub struct State {
52 api_key: Option<String>,
53 api_key_from_env: bool,
54 _subscription: Subscription,
55}
56
57const VERCEL_API_KEY_VAR: &str = "VERCEL_API_KEY";
58
59impl State {
60 fn is_authenticated(&self) -> bool {
61 self.api_key.is_some()
62 }
63
64 fn reset_api_key(&self, cx: &mut Context<Self>) -> Task<Result<()>> {
65 let credentials_provider = <dyn CredentialsProvider>::global(cx);
66 let settings = &AllLanguageModelSettings::get_global(cx).vercel;
67 let api_url = if settings.api_url.is_empty() {
68 vercel::VERCEL_API_URL.to_string()
69 } else {
70 settings.api_url.clone()
71 };
72 cx.spawn(async move |this, cx| {
73 credentials_provider
74 .delete_credentials(&api_url, &cx)
75 .await
76 .log_err();
77 this.update(cx, |this, cx| {
78 this.api_key = None;
79 this.api_key_from_env = false;
80 cx.notify();
81 })
82 })
83 }
84
85 fn set_api_key(&mut self, api_key: String, cx: &mut Context<Self>) -> Task<Result<()>> {
86 let credentials_provider = <dyn CredentialsProvider>::global(cx);
87 let settings = &AllLanguageModelSettings::get_global(cx).vercel;
88 let api_url = if settings.api_url.is_empty() {
89 vercel::VERCEL_API_URL.to_string()
90 } else {
91 settings.api_url.clone()
92 };
93 cx.spawn(async move |this, cx| {
94 credentials_provider
95 .write_credentials(&api_url, "Bearer", api_key.as_bytes(), &cx)
96 .await
97 .log_err();
98 this.update(cx, |this, cx| {
99 this.api_key = Some(api_key);
100 cx.notify();
101 })
102 })
103 }
104
105 fn authenticate(&self, cx: &mut Context<Self>) -> Task<Result<(), AuthenticateError>> {
106 if self.is_authenticated() {
107 return Task::ready(Ok(()));
108 }
109
110 let credentials_provider = <dyn CredentialsProvider>::global(cx);
111 let settings = &AllLanguageModelSettings::get_global(cx).vercel;
112 let api_url = if settings.api_url.is_empty() {
113 vercel::VERCEL_API_URL.to_string()
114 } else {
115 settings.api_url.clone()
116 };
117 cx.spawn(async move |this, cx| {
118 let (api_key, from_env) = if let Ok(api_key) = std::env::var(VERCEL_API_KEY_VAR) {
119 (api_key, true)
120 } else {
121 let (_, api_key) = credentials_provider
122 .read_credentials(&api_url, &cx)
123 .await?
124 .ok_or(AuthenticateError::CredentialsNotFound)?;
125 (
126 String::from_utf8(api_key).context("invalid {PROVIDER_NAME} API key")?,
127 false,
128 )
129 };
130 this.update(cx, |this, cx| {
131 this.api_key = Some(api_key);
132 this.api_key_from_env = from_env;
133 cx.notify();
134 })?;
135
136 Ok(())
137 })
138 }
139}
140
141impl VercelLanguageModelProvider {
142 pub fn new(http_client: Arc<dyn HttpClient>, cx: &mut App) -> Self {
143 let state = cx.new(|cx| State {
144 api_key: None,
145 api_key_from_env: false,
146 _subscription: cx.observe_global::<SettingsStore>(|_this: &mut State, cx| {
147 cx.notify();
148 }),
149 });
150
151 Self { http_client, state }
152 }
153
154 fn create_language_model(&self, model: vercel::Model) -> Arc<dyn LanguageModel> {
155 Arc::new(VercelLanguageModel {
156 id: LanguageModelId::from(model.id().to_string()),
157 model,
158 state: self.state.clone(),
159 http_client: self.http_client.clone(),
160 request_limiter: RateLimiter::new(4),
161 })
162 }
163}
164
165impl LanguageModelProviderState for VercelLanguageModelProvider {
166 type ObservableEntity = State;
167
168 fn observable_entity(&self) -> Option<gpui::Entity<Self::ObservableEntity>> {
169 Some(self.state.clone())
170 }
171}
172
173impl LanguageModelProvider for VercelLanguageModelProvider {
174 fn id(&self) -> LanguageModelProviderId {
175 PROVIDER_ID
176 }
177
178 fn name(&self) -> LanguageModelProviderName {
179 PROVIDER_NAME
180 }
181
182 fn icon(&self) -> IconName {
183 IconName::AiVZero
184 }
185
186 fn default_model(&self, _cx: &App) -> Option<Arc<dyn LanguageModel>> {
187 Some(self.create_language_model(vercel::Model::default()))
188 }
189
190 fn default_fast_model(&self, _cx: &App) -> Option<Arc<dyn LanguageModel>> {
191 Some(self.create_language_model(vercel::Model::default_fast()))
192 }
193
194 fn provided_models(&self, cx: &App) -> Vec<Arc<dyn LanguageModel>> {
195 let mut models = BTreeMap::default();
196
197 for model in vercel::Model::iter() {
198 if !matches!(model, vercel::Model::Custom { .. }) {
199 models.insert(model.id().to_string(), model);
200 }
201 }
202
203 for model in &AllLanguageModelSettings::get_global(cx)
204 .vercel
205 .available_models
206 {
207 models.insert(
208 model.name.clone(),
209 vercel::Model::Custom {
210 name: model.name.clone(),
211 display_name: model.display_name.clone(),
212 max_tokens: model.max_tokens,
213 max_output_tokens: model.max_output_tokens,
214 max_completion_tokens: model.max_completion_tokens,
215 },
216 );
217 }
218
219 models
220 .into_values()
221 .map(|model| self.create_language_model(model))
222 .collect()
223 }
224
225 fn is_authenticated(&self, cx: &App) -> bool {
226 self.state.read(cx).is_authenticated()
227 }
228
229 fn authenticate(&self, cx: &mut App) -> Task<Result<(), AuthenticateError>> {
230 self.state.update(cx, |state, cx| state.authenticate(cx))
231 }
232
233 fn configuration_view(&self, window: &mut Window, cx: &mut App) -> AnyView {
234 cx.new(|cx| ConfigurationView::new(self.state.clone(), window, cx))
235 .into()
236 }
237
238 fn reset_credentials(&self, cx: &mut App) -> Task<Result<()>> {
239 self.state.update(cx, |state, cx| state.reset_api_key(cx))
240 }
241}
242
243pub struct VercelLanguageModel {
244 id: LanguageModelId,
245 model: vercel::Model,
246 state: gpui::Entity<State>,
247 http_client: Arc<dyn HttpClient>,
248 request_limiter: RateLimiter,
249}
250
251impl VercelLanguageModel {
252 fn stream_completion(
253 &self,
254 request: open_ai::Request,
255 cx: &AsyncApp,
256 ) -> BoxFuture<'static, Result<futures::stream::BoxStream<'static, Result<ResponseStreamEvent>>>>
257 {
258 let http_client = self.http_client.clone();
259 let Ok((api_key, api_url)) = cx.read_entity(&self.state, |state, cx| {
260 let settings = &AllLanguageModelSettings::get_global(cx).vercel;
261 let api_url = if settings.api_url.is_empty() {
262 vercel::VERCEL_API_URL.to_string()
263 } else {
264 settings.api_url.clone()
265 };
266 (state.api_key.clone(), api_url)
267 }) else {
268 return futures::future::ready(Err(anyhow!("App state dropped"))).boxed();
269 };
270
271 let future = self.request_limiter.stream(async move {
272 let Some(api_key) = api_key else {
273 return Err(LanguageModelCompletionError::NoApiKey {
274 provider: PROVIDER_NAME,
275 });
276 };
277 let request =
278 open_ai::stream_completion(http_client.as_ref(), &api_url, &api_key, request);
279 let response = request.await?;
280 Ok(response)
281 });
282
283 async move { Ok(future.await?.boxed()) }.boxed()
284 }
285}
286
287impl LanguageModel for VercelLanguageModel {
288 fn id(&self) -> LanguageModelId {
289 self.id.clone()
290 }
291
292 fn name(&self) -> LanguageModelName {
293 LanguageModelName::from(self.model.display_name().to_string())
294 }
295
296 fn provider_id(&self) -> LanguageModelProviderId {
297 PROVIDER_ID
298 }
299
300 fn provider_name(&self) -> LanguageModelProviderName {
301 PROVIDER_NAME
302 }
303
304 fn supports_tools(&self) -> bool {
305 true
306 }
307
308 fn supports_images(&self) -> bool {
309 true
310 }
311
312 fn supports_tool_choice(&self, choice: LanguageModelToolChoice) -> bool {
313 match choice {
314 LanguageModelToolChoice::Auto
315 | LanguageModelToolChoice::Any
316 | LanguageModelToolChoice::None => true,
317 }
318 }
319
320 fn telemetry_id(&self) -> String {
321 format!("vercel/{}", self.model.id())
322 }
323
324 fn max_token_count(&self) -> u64 {
325 self.model.max_token_count()
326 }
327
328 fn max_output_tokens(&self) -> Option<u64> {
329 self.model.max_output_tokens()
330 }
331
332 fn count_tokens(
333 &self,
334 request: LanguageModelRequest,
335 cx: &App,
336 ) -> BoxFuture<'static, Result<u64>> {
337 count_vercel_tokens(request, self.model.clone(), cx)
338 }
339
340 fn stream_completion(
341 &self,
342 request: LanguageModelRequest,
343 cx: &AsyncApp,
344 ) -> BoxFuture<
345 'static,
346 Result<
347 futures::stream::BoxStream<
348 'static,
349 Result<LanguageModelCompletionEvent, LanguageModelCompletionError>,
350 >,
351 LanguageModelCompletionError,
352 >,
353 > {
354 let request = crate::provider::open_ai::into_open_ai(
355 request,
356 self.model.id(),
357 self.model.supports_parallel_tool_calls(),
358 self.max_output_tokens(),
359 None,
360 );
361 let completions = self.stream_completion(request, cx);
362 async move {
363 let mapper = crate::provider::open_ai::OpenAiEventMapper::new();
364 Ok(mapper.map_stream(completions.await?).boxed())
365 }
366 .boxed()
367 }
368}
369
370pub fn count_vercel_tokens(
371 request: LanguageModelRequest,
372 model: Model,
373 cx: &App,
374) -> BoxFuture<'static, Result<u64>> {
375 cx.background_spawn(async move {
376 let messages = request
377 .messages
378 .into_iter()
379 .map(|message| tiktoken_rs::ChatCompletionRequestMessage {
380 role: match message.role {
381 Role::User => "user".into(),
382 Role::Assistant => "assistant".into(),
383 Role::System => "system".into(),
384 },
385 content: Some(message.string_contents()),
386 name: None,
387 function_call: None,
388 })
389 .collect::<Vec<_>>();
390
391 match model {
392 Model::Custom { max_tokens, .. } => {
393 let model = if max_tokens >= 100_000 {
394 // If the max tokens is 100k or more, it is likely the o200k_base tokenizer from gpt4o
395 "gpt-4o"
396 } else {
397 // Otherwise fallback to gpt-4, since only cl100k_base and o200k_base are
398 // supported with this tiktoken method
399 "gpt-4"
400 };
401 tiktoken_rs::num_tokens_from_messages(model, &messages)
402 }
403 // Map Vercel models to appropriate OpenAI models for token counting
404 // since Vercel uses OpenAI-compatible API
405 Model::VZeroOnePointFiveMedium => {
406 // Vercel v0 is similar to GPT-4o, so use gpt-4o for token counting
407 tiktoken_rs::num_tokens_from_messages("gpt-4o", &messages)
408 }
409 }
410 .map(|tokens| tokens as u64)
411 })
412 .boxed()
413}
414
415struct ConfigurationView {
416 api_key_editor: Entity<SingleLineInput>,
417 state: gpui::Entity<State>,
418 load_credentials_task: Option<Task<()>>,
419}
420
421impl ConfigurationView {
422 fn new(state: gpui::Entity<State>, window: &mut Window, cx: &mut Context<Self>) -> Self {
423 let api_key_editor = cx.new(|cx| {
424 SingleLineInput::new(
425 window,
426 cx,
427 "v1:0000000000000000000000000000000000000000000000000",
428 )
429 .label("API key")
430 });
431
432 cx.observe(&state, |_, _, cx| {
433 cx.notify();
434 })
435 .detach();
436
437 let load_credentials_task = Some(cx.spawn_in(window, {
438 let state = state.clone();
439 async move |this, cx| {
440 if let Some(task) = state
441 .update(cx, |state, cx| state.authenticate(cx))
442 .log_err()
443 {
444 // We don't log an error, because "not signed in" is also an error.
445 let _ = task.await;
446 }
447 this.update(cx, |this, cx| {
448 this.load_credentials_task = None;
449 cx.notify();
450 })
451 .log_err();
452 }
453 }));
454
455 Self {
456 api_key_editor,
457 state,
458 load_credentials_task,
459 }
460 }
461
462 fn save_api_key(&mut self, _: &menu::Confirm, window: &mut Window, cx: &mut Context<Self>) {
463 let api_key = self
464 .api_key_editor
465 .read(cx)
466 .editor()
467 .read(cx)
468 .text(cx)
469 .trim()
470 .to_string();
471
472 // Don't proceed if no API key is provided and we're not authenticated
473 if api_key.is_empty() && !self.state.read(cx).is_authenticated() {
474 return;
475 }
476
477 let state = self.state.clone();
478 cx.spawn_in(window, async move |_, cx| {
479 state
480 .update(cx, |state, cx| state.set_api_key(api_key, cx))?
481 .await
482 })
483 .detach_and_log_err(cx);
484
485 cx.notify();
486 }
487
488 fn reset_api_key(&mut self, window: &mut Window, cx: &mut Context<Self>) {
489 self.api_key_editor.update(cx, |input, cx| {
490 input.editor.update(cx, |editor, cx| {
491 editor.set_text("", window, cx);
492 });
493 });
494
495 let state = self.state.clone();
496 cx.spawn_in(window, async move |_, cx| {
497 state.update(cx, |state, cx| state.reset_api_key(cx))?.await
498 })
499 .detach_and_log_err(cx);
500
501 cx.notify();
502 }
503
504 fn should_render_editor(&self, cx: &mut Context<Self>) -> bool {
505 !self.state.read(cx).is_authenticated()
506 }
507}
508
509impl Render for ConfigurationView {
510 fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
511 let env_var_set = self.state.read(cx).api_key_from_env;
512
513 let api_key_section = if self.should_render_editor(cx) {
514 v_flex()
515 .on_action(cx.listener(Self::save_api_key))
516 .child(Label::new("To use Zed's agent with Vercel v0, you need to add an API key. Follow these steps:"))
517 .child(
518 List::new()
519 .child(InstructionListItem::new(
520 "Create one by visiting",
521 Some("Vercel v0's console"),
522 Some("https://v0.dev/chat/settings/keys"),
523 ))
524 .child(InstructionListItem::text_only(
525 "Paste your API key below and hit enter to start using the agent",
526 )),
527 )
528 .child(self.api_key_editor.clone())
529 .child(
530 Label::new(format!(
531 "You can also assign the {VERCEL_API_KEY_VAR} environment variable and restart Zed."
532 ))
533 .size(LabelSize::Small)
534 .color(Color::Muted),
535 )
536 .child(
537 Label::new("Note that Vercel v0 is a custom OpenAI-compatible provider.")
538 .size(LabelSize::Small)
539 .color(Color::Muted),
540 )
541 .into_any()
542 } else {
543 h_flex()
544 .mt_1()
545 .p_1()
546 .justify_between()
547 .rounded_md()
548 .border_1()
549 .border_color(cx.theme().colors().border)
550 .bg(cx.theme().colors().background)
551 .child(
552 h_flex()
553 .gap_1()
554 .child(Icon::new(IconName::Check).color(Color::Success))
555 .child(Label::new(if env_var_set {
556 format!("API key set in {VERCEL_API_KEY_VAR} environment variable.")
557 } else {
558 "API key configured.".to_string()
559 })),
560 )
561 .child(
562 Button::new("reset-api-key", "Reset API Key")
563 .label_size(LabelSize::Small)
564 .icon(IconName::Undo)
565 .icon_size(IconSize::Small)
566 .icon_position(IconPosition::Start)
567 .layer(ElevationIndex::ModalSurface)
568 .when(env_var_set, |this| {
569 this.tooltip(Tooltip::text(format!("To reset your API key, unset the {VERCEL_API_KEY_VAR} environment variable.")))
570 })
571 .on_click(cx.listener(|this, _, window, cx| this.reset_api_key(window, cx))),
572 )
573 .into_any()
574 };
575
576 if self.load_credentials_task.is_some() {
577 div().child(Label::new("Loading credentials…")).into_any()
578 } else {
579 v_flex().size_full().child(api_key_section).into_any()
580 }
581 }
582}