Refactoring work to move to Azure.AI.OpenAI v2.1.0 (#328)

shell/agents/AIShell.OpenAI.Agent/AIShell.OpenAI.Agent.csproj

@@ -21,9 +21,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Azure.AI.OpenAI" Version="1.0.0-beta.17" />
-    <PackageReference Include="Azure.Core" Version="1.39.0" />
-    <PackageReference Include="SharpToken" Version="2.0.3" />
+    <PackageReference Include="Azure.AI.OpenAI" Version="2.1.0" />
+    <PackageReference Include="Microsoft.ML.Tokenizers" Version="1.0.1" />
+    <PackageReference Include="Microsoft.ML.Tokenizers.Data.O200kBase" Version="1.0.1" />
+    <PackageReference Include="Microsoft.ML.Tokenizers.Data.Cl100kBase" Version="1.0.1" />
   </ItemGroup>
 
   <ItemGroup>

shell/agents/AIShell.OpenAI.Agent/Agent.cs

@@ -1,7 +1,8 @@
+using System.ClientModel;
 using System.Text;
 using System.Text.Json;
-using Azure.AI.OpenAI;
 using AIShell.Abstraction;
+using OpenAI.Chat;
 
 namespace AIShell.OpenAI.Agent;
 
@@ -106,37 +107,44 @@ public async Task<bool> ChatAsync(string input, IShell shell)
             return checkPass;
         }
 
-        string responseContent = null;
-        StreamingResponse<StreamingChatCompletionsUpdate> response = await host.RunWithSpinnerAsync(
-            () => _chatService.GetStreamingChatResponseAsync(input, token)
-        ).ConfigureAwait(false);
+        IAsyncEnumerator<StreamingChatCompletionUpdate> response = await host
+            .RunWithSpinnerAsync(
+                () => _chatService.GetStreamingChatResponseAsync(input, token)
+            ).ConfigureAwait(false);
 
         if (response is not null)
         {
+            StreamingChatCompletionUpdate update = null;
             using var streamingRender = host.NewStreamRender(token);
 
             try
             {
-                await foreach (StreamingChatCompletionsUpdate chatUpdate in response)
+                do
                 {
-                    if (string.IsNullOrEmpty(chatUpdate.ContentUpdate))
+                    update = response.Current;
+                    if (update.ContentUpdate.Count > 0)
                     {
-                        continue;
+                        streamingRender.Refresh(update.ContentUpdate[0].Text);
                     }
-
-                    streamingRender.Refresh(chatUpdate.ContentUpdate);
                 }
+                while (await response.MoveNextAsync().ConfigureAwait(continueOnCapturedContext: false));
             }
             catch (OperationCanceledException)
             {
-                // Ignore the cancellation exception.
+                update = null;
             }
 
-            responseContent = streamingRender.AccumulatedContent;
+            if (update is null)
+            {
+                _chatService.CalibrateChatHistory(usage: null, response: null);
+            }
+            else
+            {
+                string responseContent = streamingRender.AccumulatedContent;
+                _chatService.CalibrateChatHistory(update.Usage, new AssistantChatMessage(responseContent));
+            }
         }
 
-        _chatService.AddResponseToHistory(responseContent);
-
         return checkPass;
     }
 

shell/agents/AIShell.OpenAI.Agent/Helpers.cs

@@ -3,10 +3,7 @@
 using System.Text.Json;
 using System.Text.Json.Serialization;
 using System.Text.Json.Serialization.Metadata;
-
-using Azure;
-using Azure.Core;
-using Azure.Core.Pipeline;
+using System.ClientModel.Primitives;
 
 namespace AIShell.OpenAI.Agent;
 
@@ -134,69 +131,25 @@ public override JsonTypeInfo GetTypeInfo(Type type, JsonSerializerOptions option
     }
 }
 
-#nullable enable
-
-/// <summary>
-/// Used for setting user key for the Azure.OpenAI.Client.
-/// </summary>
-internal sealed class UserKeyPolicy : HttpPipelineSynchronousPolicy
-{
-    private readonly string _name;
-    private readonly AzureKeyCredential _credential;
-
-    /// <summary>
-    /// Initializes a new instance of the <see cref="UserKeyPolicy"/> class.
-    /// </summary>
-    /// <param name="credential">The <see cref="AzureKeyCredential"/> used to authenticate requests.</param>
-    /// <param name="name">The name of the key header used for the credential.</param>
-    public UserKeyPolicy(AzureKeyCredential credential, string name)
-    {
-        ArgumentNullException.ThrowIfNull(credential);
-        ArgumentException.ThrowIfNullOrEmpty(name);
-
-        _credential = credential;
-        _name = name;
-    }
-
-    /// <inheritdoc/>
-    public override void OnSendingRequest(HttpMessage message)
-    {
-        base.OnSendingRequest(message);
-        message.Request.Headers.SetValue(_name, _credential.Key);
-    }
-}
-
 /// <summary>
-/// Used for configuring the retry policy for Azure.OpenAI.Client.
+/// Initializes a new instance of the <see cref="ChatRetryPolicy"/> class.
 /// </summary>
-internal sealed class ChatRetryPolicy : RetryPolicy
+/// <param name="maxRetries">The maximum number of retries to attempt.</param>
+/// <param name="delayStrategy">The delay to use for computing the interval between retry attempts.</param>
+internal sealed class ChatRetryPolicy(int maxRetries = 2) : ClientRetryPolicy(maxRetries)
 {
     private const string RetryAfterHeaderName = "Retry-After";
     private const string RetryAfterMsHeaderName = "retry-after-ms";
     private const string XRetryAfterMsHeaderName = "x-ms-retry-after-ms";
 
-    /// <summary>
-    /// Initializes a new instance of the <see cref="ChatRetryPolicy"/> class.
-    /// </summary>
-    /// <param name="maxRetries">The maximum number of retries to attempt.</param>
-    /// <param name="delayStrategy">The delay to use for computing the interval between retry attempts.</param>
-    public ChatRetryPolicy(int maxRetries = 2, DelayStrategy? delayStrategy = default) : base(
-        maxRetries,
-        delayStrategy ?? DelayStrategy.CreateExponentialDelayStrategy(
-            initialDelay: TimeSpan.FromSeconds(0.8),
-            maxDelay: TimeSpan.FromSeconds(5)))
-    {
-        // By default, we retry 2 times at most, and use a delay strategy that waits 5 seconds at most between retries.
-    }
-
-    protected override bool ShouldRetry(HttpMessage message, Exception? exception) => ShouldRetryImpl(message, exception);
-    protected override ValueTask<bool> ShouldRetryAsync(HttpMessage message, Exception? exception) => new(ShouldRetryImpl(message, exception));
+    protected override bool ShouldRetry(PipelineMessage message, Exception exception) => ShouldRetryImpl(message, exception);
+    protected override ValueTask<bool> ShouldRetryAsync(PipelineMessage message, Exception exception) => new(ShouldRetryImpl(message, exception));
 
-    private bool ShouldRetryImpl(HttpMessage message, Exception? exception)
+    private bool ShouldRetryImpl(PipelineMessage message, Exception exception)
     {
         bool result = base.ShouldRetry(message, exception);
 
-        if (result && message.HasResponse)
+        if (result && message.Response is not null)
         {
             TimeSpan? retryAfter = GetRetryAfterHeaderValue(message.Response.Headers);
             if (retryAfter > TimeSpan.FromSeconds(5))
@@ -209,22 +162,22 @@ private bool ShouldRetryImpl(HttpMessage message, Exception? exception)
         return result;
     }
 
-    private static TimeSpan? GetRetryAfterHeaderValue(ResponseHeaders headers)
+    private static TimeSpan? GetRetryAfterHeaderValue(PipelineResponseHeaders headers)
     {
         if (headers.TryGetValue(RetryAfterMsHeaderName, out var retryAfterValue) ||
             headers.TryGetValue(XRetryAfterMsHeaderName, out retryAfterValue))
         {
-            if (int.TryParse(retryAfterValue, out var delaySeconds))
+            if (int.TryParse(retryAfterValue, out var delayInMS))
             {
-                return TimeSpan.FromMilliseconds(delaySeconds);
+                return TimeSpan.FromMilliseconds(delayInMS);
             }
         }
 
         if (headers.TryGetValue(RetryAfterHeaderName, out retryAfterValue))
         {
-            if (int.TryParse(retryAfterValue, out var delaySeconds))
+            if (int.TryParse(retryAfterValue, out var delayInSec))
             {
-                return TimeSpan.FromSeconds(delaySeconds);
+                return TimeSpan.FromSeconds(delayInSec);
             }
 
             if (DateTimeOffset.TryParse(retryAfterValue, out DateTimeOffset delayTime))

shell/agents/AIShell.OpenAI.Agent/ModelInfo.cs

@@ -1,18 +1,17 @@
-using SharpToken;
+using Microsoft.ML.Tokenizers;
 
 namespace AIShell.OpenAI.Agent;
 
 internal class ModelInfo
 {
     // Models gpt4, gpt3.5, and the variants of them all use the 'cl100k_base' token encoding.
-    // But the gpt-4o model uses the 'o200k_base' token encoding. For reference:
-    //   https://github.com/openai/tiktoken/blob/5d970c1100d3210b42497203d6b5c1e30cfda6cb/tiktoken/model.py#L7
-    //   https://github.com/dmitry-brazhenko/SharpToken/blob/main/SharpToken/Lib/Model.cs#L8
+    // But gpt-4o and o1 models use the 'o200k_base' token encoding. For reference:
+    //   https://github.com/openai/tiktoken/blob/63527649963def8c759b0f91f2eb69a40934e468/tiktoken/model.py
     private const string Gpt4oEncoding = "o200k_base";
     private const string Gpt34Encoding = "cl100k_base";
 
     private static readonly Dictionary<string, ModelInfo> s_modelMap;
-    private static readonly Dictionary<string, Task<GptEncoding>> s_encodingMap;
+    private static readonly Dictionary<string, Task<Tokenizer>> s_encodingMap;
 
     static ModelInfo()
     {
@@ -21,6 +20,7 @@ static ModelInfo()
         // https://github.com/openai/openai-cookbook/blob/main/examples/How_to_count_tokens_with_tiktoken.ipynb
         s_modelMap = new(StringComparer.OrdinalIgnoreCase)
         {
+            ["o1"]            = new(tokenLimit: 200_000, encoding: Gpt4oEncoding),
             ["gpt-4o"]        = new(tokenLimit: 128_000, encoding: Gpt4oEncoding),
             ["gpt-4"]         = new(tokenLimit: 8_192),
             ["gpt-4-32k"]     = new(tokenLimit: 32_768),
@@ -35,8 +35,8 @@ static ModelInfo()
         // we don't block the startup and the values will be ready when we really need them.
         s_encodingMap = new(StringComparer.OrdinalIgnoreCase)
         {
-            [Gpt34Encoding] = Task.Run(() => GptEncoding.GetEncoding(Gpt34Encoding)),
-            [Gpt4oEncoding] = Task.Run(() => GptEncoding.GetEncoding(Gpt4oEncoding))
+            [Gpt34Encoding] = Task.Run(() => (Tokenizer)TiktokenTokenizer.CreateForEncoding(Gpt34Encoding)),
+            [Gpt4oEncoding] = Task.Run(() => (Tokenizer)TiktokenTokenizer.CreateForEncoding(Gpt4oEncoding))
         };
     }
 
@@ -45,24 +45,24 @@ private ModelInfo(int tokenLimit, string encoding = null)
         TokenLimit = tokenLimit;
         _encodingName = encoding ?? Gpt34Encoding;
 
-        // For gpt4 and gpt3.5-turbo, the following 2 properties are the same.
+        // For gpt4o, gpt4 and gpt3.5-turbo, the following 2 properties are the same.
         // See https://github.com/openai/openai-cookbook/blob/main/examples/How_to_count_tokens_with_tiktoken.ipynb
         TokensPerMessage = 3;
         TokensPerName = 1;
     }
 
     private readonly string _encodingName;
-    private GptEncoding _gptEncoding;
+    private Tokenizer _gptEncoding;
 
     internal int TokenLimit { get; }
     internal int TokensPerMessage { get; }
     internal int TokensPerName { get; }
-    internal GptEncoding Encoding
+    internal Tokenizer Encoding
     {
         get {
-            _gptEncoding ??= s_encodingMap.TryGetValue(_encodingName, out Task<GptEncoding> value)
+            _gptEncoding ??= s_encodingMap.TryGetValue(_encodingName, out Task<Tokenizer> value)
                 ? value.Result
-                : GptEncoding.GetEncoding(_encodingName);
+                : TiktokenTokenizer.CreateForEncoding(_encodingName);
             return _gptEncoding;
         }
     }