Add stream param for inference APIs

src/plugins/dashboard/public/dashboard_app/hooks/use_observability_ai_assistant_context.tsx

@@ -114,9 +114,11 @@ export function useObservabilityAIAssistantContext({
                         },
                         metric: {
                           type: 'object',
+                          properties: {},
                         },
                         gauge: {
                           type: 'object',
+                          properties: {},
                         },
                         pie: {
                           type: 'object',
@@ -158,6 +160,7 @@ export function useObservabilityAIAssistantContext({
                         },
                         table: {
                           type: 'object',
+                          properties: {},
                         },
                         tagcloud: {
                           type: 'object',

x-pack/packages/ai-infra/inference-common/index.ts

@@ -25,12 +25,15 @@ export {
   type ToolChoice,
   type ChatCompleteAPI,
   type ChatCompleteOptions,
-  type ChatCompletionResponse,
+  type ChatCompleteCompositeResponse,
   type ChatCompletionTokenCountEvent,
   type ChatCompletionEvent,
   type ChatCompletionChunkEvent,
   type ChatCompletionChunkToolCall,
   type ChatCompletionMessageEvent,
+  type ChatCompleteStreamResponse,
+  type ChatCompleteResponse,
+  type ChatCompletionTokenCount,
   withoutTokenCountEvents,
   withoutChunkEvents,
   isChatCompletionMessageEvent,
@@ -48,7 +51,10 @@ export {
 export {
   OutputEventType,
   type OutputAPI,
+  type OutputOptions,
   type OutputResponse,
+  type OutputCompositeResponse,
+  type OutputStreamResponse,
   type OutputCompleteEvent,
   type OutputUpdateEvent,
   type Output,

x-pack/packages/ai-infra/inference-common/src/chat_complete/api.ts

@@ -6,16 +6,35 @@
  */
 
 import type { Observable } from 'rxjs';
-import type { ToolOptions } from './tools';
+import type { ToolCallsOf, ToolOptions } from './tools';
 import type { Message } from './messages';
-import type { ChatCompletionEvent } from './events';
+import type { ChatCompletionEvent, ChatCompletionTokenCount } from './events';
 
 /**
  * Request a completion from the LLM based on a prompt or conversation.
  *
- * @example using the API to get an event observable.
+ * By default, The complete LLM response will be returned as a promise.
+ *
+ * @example using the API in stream mode to get an event observable.
+ * ```ts
+ * const response = await chatComplete({
+ *   connectorId: 'my-connector',
+ *   system: "You are a helpful assistant",
+ *   messages: [
+ *      { role: MessageRole.User, content: "Some question?"},
+ *   ]
+ * });
+ *
+ * const { content, tokens, toolCalls } = response;
+ * ```
+ *
+ * Use `stream: true` to return an observable returning the full set
+ * of events in real time.
+ *
+ * @example using the API in stream mode to get an event observable.
  * ```ts
  * const events$ = chatComplete({
+ *   stream: true,
  *   connectorId: 'my-connector',
  *   system: "You are a helpful assistant",
  *   messages: [
@@ -24,20 +43,44 @@ import type { ChatCompletionEvent } from './events';
  *      { role: MessageRole.User, content: "Another question?"},
  *   ]
  * });
+ *
+ * // using the observable
+ * events$.pipe(withoutTokenCountEvents()).subscribe((event) => {
+ *  if (isChatCompletionChunkEvent(event)) {
+ *     // do something with the chunk event
+ *   } else {
+ *     // do something with the message event
+ *   }
+ * });
+ * ```
  */
-export type ChatCompleteAPI = <TToolOptions extends ToolOptions = ToolOptions>(
-  options: ChatCompleteOptions<TToolOptions>
-) => ChatCompletionResponse<TToolOptions>;
+export type ChatCompleteAPI = <
+  TToolOptions extends ToolOptions = ToolOptions,
+  TStream extends boolean = false
+>(
+  options: ChatCompleteOptions<TToolOptions, TStream>
+) => ChatCompleteCompositeResponse<TToolOptions, TStream>;
 
 /**
  * Options used to call the {@link ChatCompleteAPI}
  */
-export type ChatCompleteOptions<TToolOptions extends ToolOptions = ToolOptions> = {
+export type ChatCompleteOptions<
+  TToolOptions extends ToolOptions = ToolOptions,
+  TStream extends boolean = false
+> = {
   /**
    * The ID of the connector to use.
    * Must be a genAI compatible connector, or an error will be thrown.
    */
   connectorId: string;
+  /**
+   * Set to true to enable streaming, which will change the API response type from
+   * a single {@link ChatCompleteResponse} promise
+   * to an {@link ChatCompleteStreamResponse} event observable.
+   *
+   * Defaults to false.
+   */
+  stream?: TStream;
   /**
    * Optional system message for the LLM.
    */
@@ -53,14 +96,44 @@ export type ChatCompleteOptions<TToolOptions extends ToolOptions = ToolOptions>
 } & TToolOptions;
 
 /**
- * Response from the {@link ChatCompleteAPI}.
+ * Composite response type from the {@link ChatCompleteAPI},
+ * which can be either an observable or a promise depending on
+ * whether API was called with stream mode enabled or not.
+ */
+export type ChatCompleteCompositeResponse<
+  TToolOptions extends ToolOptions = ToolOptions,
+  TStream extends boolean = false
+> = TStream extends true
+  ? ChatCompleteStreamResponse<TToolOptions>
+  : Promise<ChatCompleteResponse<TToolOptions>>;
+
+/**
+ * Response from the {@link ChatCompleteAPI} when streaming is enabled.
  *
  * Observable of {@link ChatCompletionEvent}
  */
-export type ChatCompletionResponse<TToolOptions extends ToolOptions = ToolOptions> = Observable<
+export type ChatCompleteStreamResponse<TToolOptions extends ToolOptions = ToolOptions> = Observable<
   ChatCompletionEvent<TToolOptions>
 >;
 
+/**
+ * Response from the {@link ChatCompleteAPI} when streaming is not enabled.
+ */
+export interface ChatCompleteResponse<TToolOptions extends ToolOptions = ToolOptions> {
+  /**
+   * The text content of the LLM response.
+   */
+  content: string;
+  /**
+   * The eventual tool calls performed by the LLM.
+   */
+  toolCalls: ToolCallsOf<TToolOptions>['toolCalls'];
+  /**
+   * Token counts
+   */
+  tokens?: ChatCompletionTokenCount;
+}
+
 /**
  * Define the function calling mode when using inference APIs.
  * - native will use the LLM's native function calling (requires the LLM to have native support)

x-pack/packages/ai-infra/inference-common/src/chat_complete/events.ts

@@ -76,26 +76,34 @@ export type ChatCompletionChunkEvent =
     tool_calls: ChatCompletionChunkToolCall[];
   };
 
+/**
+ * Token count structure the chatComplete API.
+ */
+export interface ChatCompletionTokenCount {
+  /**
+   * Input token count
+   */
+  prompt: number;
+  /**
+   * Output token count
+   */
+  completion: number;
+  /**
+   * Total token count
+   */
+  total: number;
+}
+
 /**
  * Token count event, send only once, usually (but not necessarily)
  * before the message event
  */
 export type ChatCompletionTokenCountEvent =
   InferenceTaskEventBase<ChatCompletionEventType.ChatCompletionTokenCount> & {
-    tokens: {
-      /**
-       * Input token count
-       */
-      prompt: number;
-      /**
-       * Output token count
-       */
-      completion: number;
-      /**
-       * Total token count
-       */
-      total: number;
-    };
+    /**
+     * The token counts structure
+     */
+    tokens: ChatCompletionTokenCount;
   };
 
 /**

x-pack/packages/ai-infra/inference-common/src/chat_complete/index.ts

@@ -6,10 +6,12 @@
  */
 
 export type {
-  ChatCompletionResponse,
+  ChatCompleteCompositeResponse,
   ChatCompleteAPI,
   ChatCompleteOptions,
   FunctionCallingMode,
+  ChatCompleteStreamResponse,
+  ChatCompleteResponse,
 } from './api';
 export {
   ChatCompletionEventType,
@@ -18,6 +20,7 @@ export {
   type ChatCompletionEvent,
   type ChatCompletionChunkToolCall,
   type ChatCompletionTokenCountEvent,
+  type ChatCompletionTokenCount,
 } from './events';
 export {
   MessageRole,

x-pack/packages/ai-infra/inference-common/src/chat_complete/tool_schema.ts

@@ -11,9 +11,9 @@ interface ToolSchemaFragmentBase {
   description?: string;
 }
 
-interface ToolSchemaTypeObject extends ToolSchemaFragmentBase {
+export interface ToolSchemaTypeObject extends ToolSchemaFragmentBase {
   type: 'object';
-  properties?: Record<string, ToolSchemaType>;
+  properties: Record<string, ToolSchemaType>;
   required?: string[] | readonly string[];
 }
 
@@ -40,6 +40,9 @@ interface ToolSchemaTypeArray extends ToolSchemaFragmentBase {
   items: Exclude<ToolSchemaType, ToolSchemaTypeArray>;
 }
 
+/**
+ * A tool schema property's possible types.
+ */
 export type ToolSchemaType =
   | ToolSchemaTypeObject
   | ToolSchemaTypeString