feat(playground): rudimentary graphql support for messages input

app/schema.graphql

@@ -66,7 +66,21 @@ enum AuthMethod {
 union Bin = NominalBin | IntervalBin | MissingValueBin
 
 input ChatCompletionInput {
-  message: String!
+  messages: [ChatCompletionMessageInput!]!
+}
+
+input ChatCompletionMessageInput {
+  role: ChatCompletionMessageRole!
+
+  """The content of the message as JSON to support text and tools"""
+  content: JSON!
+}
+
+enum ChatCompletionMessageRole {
+  USER
+  SYSTEM
+  TOOL
+  AI
 }
 
 input ClearProjectInput {

app/src/pages/playground/MessageRolePicker.tsx

@@ -36,11 +36,13 @@ export function MessageRolePicker({
       data-testid="inferences-time-range"
       aria-label={`Time range for the primary inferences`}
       size="compact"
-      onSelectionChange={() => {}}
+      onSelectionChange={() => {
+        // TODO: fill out
+      }}
     >
       <Item key="system">System</Item>
       <Item key="user">User</Item>
-      <Item key="assistant">Assistant</Item>
+      <Item key="ai">AI</Item>
     </Picker>
   );
 }

app/src/pages/playground/PlaygroundOutput.tsx

@@ -2,13 +2,18 @@ import React, { useMemo, useState } from "react";
 import { useSubscription } from "react-relay";
 import { graphql, GraphQLSubscriptionConfig } from "relay-runtime";
 
-import { Card } from "@arizeai/components";
+import { Card, Flex, Icon, Icons } from "@arizeai/components";
 
 import { usePlaygroundContext } from "@phoenix/contexts/PlaygroundContext";
+import { ChatMessage, ChatMessageRole } from "@phoenix/store";
+import { assertUnreachable } from "@phoenix/typeUtils";
 
 import {
+  ChatCompletionMessageInput,
+  ChatCompletionMessageRole,
   PlaygroundOutputSubscription,
   PlaygroundOutputSubscription$data,
+  PlaygroundOutputSubscription$variables,
 } from "./__generated__/PlaygroundOutputSubscription.graphql";
 import { PlaygroundInstanceProps } from "./types";
 
@@ -34,12 +39,12 @@ export function PlaygroundOutput(props: PlaygroundOutputProps) {
 }
 
 function useChatCompletionSubscription({
-  message,
+  params,
   runId,
   onNext,
   onCompleted,
 }: {
-  message: string;
+  params: PlaygroundOutputSubscription$variables;
   runId: number;
   onNext: (response: PlaygroundOutputSubscription$data) => void;
   onCompleted: () => void;
@@ -49,11 +54,13 @@ function useChatCompletionSubscription({
   >(
     () => ({
       subscription: graphql`
-        subscription PlaygroundOutputSubscription($message: String!) {
-          chatCompletion(input: { message: $message })
+        subscription PlaygroundOutputSubscription(
+          $messages: [ChatCompletionMessageInput!]!
+        ) {
+          chatCompletion(input: { messages: $messages })
         }
       `,
-      variables: { message },
+      variables: params,
       onNext: (response) => {
         if (response) {
           onNext(response);
@@ -70,6 +77,35 @@ function useChatCompletionSubscription({
   return useSubscription(config);
 }
 
+/**
+ * A utility function to convert playground messages content to GQL chat completion message input
+ */
+function toGqlChatCompletionMessage(
+  message: ChatMessage
+): ChatCompletionMessageInput {
+  return {
+    content: message.content,
+    role: toGqlChatCompletionRole(message.role),
+  };
+}
+
+function toGqlChatCompletionRole(
+  role: ChatMessageRole
+): ChatCompletionMessageRole {
+  switch (role) {
+    case "system":
+      return "SYSTEM";
+    case "user":
+      return "USER";
+    case "tool":
+      return "TOOL";
+    case "ai":
+      return "AI";
+    default:
+      assertUnreachable(role);
+  }
+}
+
 function PlaygroundOutputText(props: PlaygroundInstanceProps) {
   const instance = usePlaygroundContext(
     (state) => state.instances[props.playgroundInstanceId]
@@ -89,12 +125,10 @@ function PlaygroundOutputText(props: PlaygroundInstanceProps) {
     throw new Error("We only support chat templates for now");
   }
 
-  const message = instance.template.messages.reduce((acc, message) => {
-    return acc + message.content;
-  }, "");
-
   useChatCompletionSubscription({
-    message: message,
+    params: {
+      messages: instance.template.messages.map(toGqlChatCompletionMessage),
+    },
     runId: instance.activeRunId,
     onNext: (response) => {
       setOutput((acc) => acc + response.chatCompletion);
@@ -103,5 +137,14 @@ function PlaygroundOutputText(props: PlaygroundInstanceProps) {
       markPlaygroundInstanceComplete(props.playgroundInstanceId);
     },
   });
+
+  if (!output) {
+    return (
+      <Flex direction="row" gap="size-100" alignItems="center">
+        <Icon svg={<Icons.LoadingOutline />} />
+        Running...
+      </Flex>
+    );
+  }
   return <span>{output}</span>;
 }

app/src/store/playgroundStore.tsx

@@ -22,7 +22,7 @@ export type PlaygroundTemplate =
 /**
  * The role of a chat message with a LLM
  */
-export type ChatMessageRole = "user" | "assistant" | "system" | "tool";
+export type ChatMessageRole = "user" | "ai" | "system" | "tool";
 
 /**
  * A chat message with a role and content

src/phoenix/server/api/input_types/ChatCompletionMessageInput.py

@@ -0,0 +1,12 @@
+import strawberry
+from strawberry.scalars import JSON
+
+from phoenix.server.api.types.ChatCompletionMessageRole import ChatCompletionMessageRole
+
+
+@strawberry.input
+class ChatCompletionMessageInput:
+    role: ChatCompletionMessageRole
+    content: JSON = strawberry.field(
+        description="The content of the message as JSON to support text and tools",
+    )

src/phoenix/server/api/subscriptions.py

@@ -1,17 +1,57 @@
 from datetime import datetime
-from typing import AsyncIterator
+from typing import TYPE_CHECKING, AsyncIterator, List
 
 import strawberry
 from sqlalchemy import insert, select
 from strawberry.types import Info
 
 from phoenix.db import models
 from phoenix.server.api.context import Context
+from phoenix.server.api.input_types.ChatCompletionMessageInput import ChatCompletionMessageInput
+from phoenix.server.api.types.ChatCompletionMessageRole import ChatCompletionMessageRole
+
+if TYPE_CHECKING:
+    from openai.types.chat import (
+        ChatCompletionMessageParam,
+    )
 
 
 @strawberry.input
 class ChatCompletionInput:
-    message: str
+    messages: List[ChatCompletionMessageInput]
+
+
+def to_openai_chat_completion_param(
+    message: ChatCompletionMessageInput,
+) -> "ChatCompletionMessageParam":
+    from openai.types.chat import (
+        ChatCompletionAssistantMessageParam,
+        ChatCompletionSystemMessageParam,
+        ChatCompletionUserMessageParam,
+    )
+
+    if message.role is ChatCompletionMessageRole.USER:
+        return ChatCompletionUserMessageParam(
+            {
+                "content": message.content,
+                "role": "user",
+            }
+        )
+    if message.role is ChatCompletionMessageRole.SYSTEM:
+        return ChatCompletionSystemMessageParam(
+            {
+                "content": message.content,
+                "role": "system",
+            }
+        )
+    if message.role is ChatCompletionMessageRole.AI:
+        return ChatCompletionAssistantMessageParam(
+            {
+                "content": message.content,
+                "role": "assistant",
+            }
+        )
+    raise ValueError(f"Unsupported role: {message.role}")
 
 
 @strawberry.type
@@ -21,13 +61,18 @@ async def chat_completion(
         self, info: Info[Context, None], input: ChatCompletionInput
     ) -> AsyncIterator[str]:
         from openai import AsyncOpenAI
-        from openai.types.chat import ChatCompletionUserMessageParam
 
         client = AsyncOpenAI()
+
+        # Loop over the input messages and map them to the OpenAI format
+
+        messages: List[ChatCompletionMessageParam] = [
+            to_openai_chat_completion_param(message) for message in input.messages
+        ]
         chunk_contents = []
         start_time = datetime.now()
         async for chunk in await client.chat.completions.create(
-            messages=[ChatCompletionUserMessageParam(role="user", content=input.message)],
+            messages=messages,
             model="gpt-4",
             stream=True,
         ):

src/phoenix/server/api/types/ChatCompletionMessageRole.py

@@ -0,0 +1,11 @@
+from enum import Enum
+
+import strawberry
+
+
+@strawberry.enum
+class ChatCompletionMessageRole(Enum):
+    USER = "USER"
+    SYSTEM = "SYSTEM"
+    TOOL = "TOOL"
+    AI = "AI"  # E.g. the assistant. Normalize to AI for consistency.