feat(core): discover vLLM models

packages/core/src/plugin/provider.ts

@@ -29,6 +29,7 @@ import { SapAICorePlugin } from "./provider/sap-ai-core.js"
 import { TogetherAIPlugin } from "./provider/togetherai.js"
 import { VercelPlugin } from "./provider/vercel.js"
 import { VenicePlugin } from "./provider/venice.js"
+import { VLLMPlugin } from "./provider/vllm.js"
 import { XAIPlugin } from "./provider/xai.js"
 import { ZenmuxPlugin } from "./provider/zenmux.js"
 import type { PluginInternal } from "./internal.js"
@@ -64,6 +65,7 @@ export const ProviderPlugins: PluginInternal.InternalPlugin[] = [
   TogetherAIPlugin,
   VercelPlugin,
   VenicePlugin,
+  VLLMPlugin,
   XAIPlugin,
   ZenmuxPlugin,
   DynamicProviderPlugin,

packages/core/src/plugin/provider/vllm.ts

@@ -0,0 +1,162 @@
+import { define } from "@opencode-ai/plugin/effect/plugin"
+import { Document, type Entry } from "@opencode-ai/schema/config"
+import { Duration, Effect, Schedule, Schema, Semaphore, Stream } from "effect"
+import { HttpClient, HttpClientRequest, HttpClientResponse } from "effect/unstable/http"
+import { Config } from "../../config.js"
+import { Model } from "../../model.js"
+import { Provider } from "../../provider.js"
+import type { PluginInternal } from "../internal.js"
+
+const providerID = "vllm"
+
+const RemoteModel = Schema.Struct({
+  id: Schema.String,
+  owned_by: Schema.String,
+  max_model_len: Schema.NullOr(Schema.Int),
+})
+
+const Response = Schema.Struct({ data: Schema.Array(RemoteModel) })
+const discovery = new Map<string, { checked: number; apiKey?: string; models?: (typeof RemoteModel.Type)[] }>()
+const discoveryLock = Semaphore.makeUnsafe(1)
+
+export function make(origin = "http://127.0.0.1:8000", interval: Duration.Input = "30 seconds") {
+  return define({
+    id: "opencode.provider.vllm",
+    effect: Effect.fn(function* (ctx) {
+      const http = HttpClient.filterStatusOk(yield* HttpClient.HttpClient)
+      const config = yield* Config.Service
+      const source = { current: configured(yield* config.entries(), origin) }
+      const loaded = { models: [] as (typeof RemoteModel.Type)[], hash: "[]" }
+
+      yield* ctx.integration.transform((integrations) => {
+        if (loaded.models.length === 0) return
+        integrations.remove(providerID)
+      })
+
+      yield* ctx.catalog.transform((catalog) => {
+        if (loaded.models.length === 0) return
+        for (const model of catalog.provider.get(providerID)?.models.values() ?? []) {
+          catalog.model.remove(providerID, model.id)
+        }
+        catalog.provider.update(providerID, (provider) => {
+          provider.name = "vLLM"
+          provider.package = "@opencode-ai/ai/providers/openai-compatible"
+          provider.settings = {
+            baseURL: source.current.baseURL,
+            provider: providerID,
+            apiKey: source.current.apiKey ?? "",
+          }
+          provider.integrationID = undefined
+          provider.activation = "enabled"
+        })
+        for (const item of loaded.models) {
+          catalog.model.update(providerID, item.id, (model) => {
+            model.modelID = Model.ID.make(item.id)
+            model.name = item.id
+            // Tool calling depends on vLLM server flags and parsers that model discovery does not report.
+            model.capabilities = { tools: false, input: ["text"], output: ["text"] }
+            model.limit = { context: item.max_model_len ?? 0, output: 0 }
+          })
+        }
+      })
+
+      const discover = Effect.fn("VLLMPlugin.discover")(function* () {
+        const current = source.current
+        if (!current.healthEndpoint || !current.modelsEndpoint) return undefined
+        return yield* discoveryLock.withPermit(
+          Effect.gen(function* () {
+            const endpoint = `${current.healthEndpoint}\n${current.modelsEndpoint}`
+            const cached = discovery.get(endpoint)
+            if (cached && cached.apiKey === current.apiKey && Date.now() - cached.checked < Duration.toMillis(interval))
+              return { source: current, models: cached.models }
+            discovery.set(endpoint, {
+              checked: Date.now(),
+              apiKey: current.apiKey,
+              models: cached && cached.apiKey === current.apiKey ? cached.models : undefined,
+            })
+            const request = (endpoint: string) =>
+              current.apiKey
+                ? HttpClientRequest.get(endpoint).pipe(
+                    HttpClientRequest.acceptJson,
+                    HttpClientRequest.bearerToken(current.apiKey),
+                  )
+                : HttpClientRequest.get(endpoint).pipe(HttpClientRequest.acceptJson)
+            yield* http.execute(request(current.healthEndpoint)).pipe(Effect.timeout("1 second"))
+            const response = yield* http
+              .execute(request(current.modelsEndpoint))
+              .pipe(Effect.flatMap(HttpClientResponse.schemaBodyJson(Response)), Effect.timeout("1 second"))
+            const models = response.data
+              .filter((model) => model.owned_by === providerID && model.id.length > 0)
+              .toSorted((a, b) => a.id.localeCompare(b.id))
+            discovery.set(endpoint, { checked: Date.now(), apiKey: current.apiKey, models })
+            return { source: current, models }
+          }),
+        )
+      })
+
+      const refresh = Effect.fn("VLLMPlugin.refresh")(function* () {
+        const result = yield* discover()
+        if (!result?.models || result.source !== source.current) return
+        const hash = JSON.stringify(result.models)
+        if (hash === loaded.hash) return
+        loaded.models = result.models
+        loaded.hash = hash
+        yield* ctx.integration.reload()
+        yield* ctx.catalog.reload()
+      })
+
+      // Keep the last successful inventory through transient outages instead of flickering model availability.
+      yield* refresh().pipe(Effect.ignore, Effect.repeat(Schedule.spaced(interval)), Effect.forkScoped)
+      const reload = Effect.fn("VLLMPlugin.reload")(function* () {
+        const next = configured(yield* config.entries(), origin)
+        if (
+          next.baseURL === source.current.baseURL &&
+          next.apiKey === source.current.apiKey &&
+          next.healthEndpoint === source.current.healthEndpoint &&
+          next.modelsEndpoint === source.current.modelsEndpoint
+        )
+          return
+        source.current = next
+        loaded.models = []
+        loaded.hash = "[]"
+        yield* ctx.integration.reload()
+        yield* ctx.catalog.reload()
+        yield* refresh().pipe(Effect.ignore)
+      })
+      yield* ctx.event.subscribe().pipe(
+        Stream.filter((event) => event.type === "config.updated"),
+        Stream.runForEach(reload),
+        Effect.forkScoped({ startImmediately: true }),
+      )
+    }),
+  } satisfies PluginInternal.InternalPlugin)
+}
+
+export const VLLMPlugin = make()
+
+function configured(entries: readonly Entry[], origin: string) {
+  const settings = entries
+    .filter((entry): entry is Document => entry.type === "document")
+    .flatMap((entry) => {
+      const settings = entry.info.providers?.[providerID]?.settings
+      return settings ? [settings] : []
+    })
+    .reduce<Provider.Settings | undefined>((result, item) => Provider.mergeOverlay(result, item), undefined)
+  const baseURL = (
+    typeof settings?.baseURL === "string" ? settings.baseURL : `${origin.replace(/\/+$/, "")}/v1`
+  ).replace(/\/+$/, "")
+  const apiKey = typeof settings?.apiKey === "string" ? settings.apiKey : undefined
+  if (!URL.canParse(baseURL)) return { baseURL, apiKey }
+  const models = new URL(baseURL)
+  if (models.protocol !== "http:" && models.protocol !== "https:") return { baseURL, apiKey }
+  models.pathname = `${models.pathname.replace(/\/+$/, "")}/models`
+  models.search = ""
+  models.hash = ""
+  const health = new URL(baseURL)
+  const path = health.pathname.replace(/\/+$/, "")
+  const prefix = path.endsWith("/v1") ? path.slice(0, -3) : path
+  health.pathname = `${prefix}/health`
+  health.search = ""
+  health.hash = ""
+  return { baseURL, apiKey, healthEndpoint: health.toString(), modelsEndpoint: models.toString() }
+}