Add ERI server assistant (#231)

app/MindWork AI Studio/Provider/Anthropic/ProviderAnthropic.cs

@@ -58,26 +58,33 @@ public sealed class ProviderAnthropic(ILogger logger) : BaseProvider("https://ap
             // Right now, we only support streaming completions:
             Stream = true,
         }, JSON_SERIALIZER_OPTIONS);
-        
-        // Build the HTTP post request:
-        var request = new HttpRequestMessage(HttpMethod.Post, "messages");
-        
-        // Set the authorization header:
-        request.Headers.Add("x-api-key", await requestedSecret.Secret.Decrypt(ENCRYPTION));
-        
-        // Set the Anthropic version:
-        request.Headers.Add("anthropic-version", "2023-06-01");
-        
-        // Set the content:
-        request.Content = new StringContent(chatRequest, Encoding.UTF8, "application/json");
-        
-        // Send the request with the ResponseHeadersRead option.
-        // This allows us to read the stream as soon as the headers are received.
-        // This is important because we want to stream the responses.
-        var response = await this.httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, token);
+
+        async Task<HttpRequestMessage> RequestBuilder()
+        {
+            // Build the HTTP post request:
+            var request = new HttpRequestMessage(HttpMethod.Post, "messages");
+
+            // Set the authorization header:
+            request.Headers.Add("x-api-key", await requestedSecret.Secret.Decrypt(ENCRYPTION));
+
+            // Set the Anthropic version:
+            request.Headers.Add("anthropic-version", "2023-06-01");
+
+            // Set the content:
+            request.Content = new StringContent(chatRequest, Encoding.UTF8, "application/json");
+            return request;
+        }
+
+        // Send the request using exponential backoff:
+        using var responseData = await this.SendRequest(RequestBuilder, token);
+        if(responseData.IsFailedAfterAllRetries)
+        {
+            this.logger.LogError($"Anthropic chat completion failed: {responseData.ErrorMessage}");
+            yield break;
+        }
         
         // Open the response stream:
-        var stream = await response.Content.ReadAsStreamAsync(token);
+        var stream = await responseData.Response!.Content.ReadAsStreamAsync(token);
         
         // Add a stream reader to read the stream, line by line:
         var streamReader = new StreamReader(stream);

app/MindWork AI Studio/Provider/BaseProvider.cs

@@ -74,4 +74,47 @@ public abstract class BaseProvider : IProvider, ISecretId
     public string SecretName => this.InstanceName;
 
     #endregion
+    
+    /// <summary>
+    /// Sends a request and handles rate limiting by exponential backoff.
+    /// </summary>
+    /// <param name="requestBuilder">A function that builds the request.</param>
+    /// <param name="token">The cancellation token.</param>
+    /// <returns>The status object of the request.</returns>
+    protected async Task<HttpRateLimitedStreamResult> SendRequest(Func<Task<HttpRequestMessage>> requestBuilder, CancellationToken token = default)
+    {
+        const int MAX_RETRIES = 6;
+        const double RETRY_DELAY_SECONDS = 4;
+        
+        var retry = 0;
+        var response = default(HttpResponseMessage);
+        var errorMessage = string.Empty;
+        while (retry++ < MAX_RETRIES)
+        {
+            using var request = await requestBuilder();
+            
+            // Send the request with the ResponseHeadersRead option.
+            // This allows us to read the stream as soon as the headers are received.
+            // This is important because we want to stream the responses.
+            var nextResponse = await this.httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, token);
+            if (nextResponse.IsSuccessStatusCode)
+            {
+                response = nextResponse;
+                break;
+            }
+
+            errorMessage = nextResponse.ReasonPhrase;
+            var timeSeconds = Math.Pow(RETRY_DELAY_SECONDS, retry + 1);
+            if(timeSeconds > 90)
+                timeSeconds = 90;
+            
+            this.logger.LogDebug($"Failed request with status code {nextResponse.StatusCode} (message = '{errorMessage}'). Retrying in {timeSeconds:0.00} seconds.");
+            await Task.Delay(TimeSpan.FromSeconds(timeSeconds), token);
+        }
+        
+        if(retry >= MAX_RETRIES)
+            return new HttpRateLimitedStreamResult(false, true, errorMessage ?? $"Failed after {MAX_RETRIES} retries; no provider message available", response);
+        
+        return new HttpRateLimitedStreamResult(true, false, string.Empty, response);
+    }
 }

app/MindWork AI Studio/Provider/Fireworks/ProviderFireworks.cs

@@ -68,22 +68,29 @@ public class ProviderFireworks(ILogger logger) : BaseProvider("https://api.firew
             Stream = true,
         }, JSON_SERIALIZER_OPTIONS);
 
-        // Build the HTTP post request:
-        var request = new HttpRequestMessage(HttpMethod.Post, "chat/completions");
-        
-        // Set the authorization header:
-        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
-        
-        // Set the content:
-        request.Content = new StringContent(fireworksChatRequest, Encoding.UTF8, "application/json");
-        
-        // Send the request with the ResponseHeadersRead option.
-        // This allows us to read the stream as soon as the headers are received.
-        // This is important because we want to stream the responses.
-        var response = await this.httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, token);
+        async Task<HttpRequestMessage> RequestBuilder()
+        {
+            // Build the HTTP post request:
+            var request = new HttpRequestMessage(HttpMethod.Post, "chat/completions");
+
+            // Set the authorization header:
+            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
+
+            // Set the content:
+            request.Content = new StringContent(fireworksChatRequest, Encoding.UTF8, "application/json");
+            return request;
+        }
+
+        // Send the request using exponential backoff:
+        using var responseData = await this.SendRequest(RequestBuilder, token);
+        if(responseData.IsFailedAfterAllRetries)
+        {
+            this.logger.LogError($"Fireworks chat completion failed: {responseData.ErrorMessage}");
+            yield break;
+        }
         
         // Open the response stream:
-        var fireworksStream = await response.Content.ReadAsStreamAsync(token);
+        var fireworksStream = await responseData.Response!.Content.ReadAsStreamAsync(token);
         
         // Add a stream reader to read the stream, line by line:
         var streamReader = new StreamReader(fireworksStream);

app/MindWork AI Studio/Provider/Google/ProviderGoogle.cs

@@ -69,22 +69,29 @@ public class ProviderGoogle(ILogger logger) : BaseProvider("https://generativela
             Stream = true,
         }, JSON_SERIALIZER_OPTIONS);
 
-        // Build the HTTP post request:
-        var request = new HttpRequestMessage(HttpMethod.Post, "chat/completions");
-        
-        // Set the authorization header:
-        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
-        
-        // Set the content:
-        request.Content = new StringContent(geminiChatRequest, Encoding.UTF8, "application/json");
-        
-        // Send the request with the ResponseHeadersRead option.
-        // This allows us to read the stream as soon as the headers are received.
-        // This is important because we want to stream the responses.
-        var response = await this.httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, token);
+        async Task<HttpRequestMessage> RequestBuilder()
+        {
+            // Build the HTTP post request:
+            var request = new HttpRequestMessage(HttpMethod.Post, "chat/completions");
+
+            // Set the authorization header:
+            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
+
+            // Set the content:
+            request.Content = new StringContent(geminiChatRequest, Encoding.UTF8, "application/json");
+            return request;
+        }
+
+        // Send the request using exponential backoff:
+        using var responseData = await this.SendRequest(RequestBuilder, token);
+        if(responseData.IsFailedAfterAllRetries)
+        {
+            this.logger.LogError($"Google chat completion failed: {responseData.ErrorMessage}");
+            yield break;
+        }
         
         // Open the response stream:
-        var geminiStream = await response.Content.ReadAsStreamAsync(token);
+        var geminiStream = await responseData.Response!.Content.ReadAsStreamAsync(token);
         
         // Add a stream reader to read the stream, line by line:
         var streamReader = new StreamReader(geminiStream);

app/MindWork AI Studio/Provider/Groq/ProviderGroq.cs

@@ -71,22 +71,29 @@ public class ProviderGroq(ILogger logger) : BaseProvider("https://api.groq.com/o
             Stream = true,
         }, JSON_SERIALIZER_OPTIONS);
 
-        // Build the HTTP post request:
-        var request = new HttpRequestMessage(HttpMethod.Post, "chat/completions");
-        
-        // Set the authorization header:
-        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
-        
-        // Set the content:
-        request.Content = new StringContent(groqChatRequest, Encoding.UTF8, "application/json");
-        
-        // Send the request with the ResponseHeadersRead option.
-        // This allows us to read the stream as soon as the headers are received.
-        // This is important because we want to stream the responses.
-        var response = await this.httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, token);
+        async Task<HttpRequestMessage> RequestBuilder()
+        {
+            // Build the HTTP post request:
+            var request = new HttpRequestMessage(HttpMethod.Post, "chat/completions");
+
+            // Set the authorization header:
+            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
+
+            // Set the content:
+            request.Content = new StringContent(groqChatRequest, Encoding.UTF8, "application/json");
+            return request;
+        }
+
+        // Send the request using exponential backoff:
+        using var responseData = await this.SendRequest(RequestBuilder, token);
+        if(responseData.IsFailedAfterAllRetries)
+        {
+            this.logger.LogError($"Groq chat completion failed: {responseData.ErrorMessage}");
+            yield break;
+        }
         
         // Open the response stream:
-        var groqStream = await response.Content.ReadAsStreamAsync(token);
+        var groqStream = await responseData.Response!.Content.ReadAsStreamAsync(token);
         
         // Add a stream reader to read the stream, line by line:
         var streamReader = new StreamReader(groqStream);

app/MindWork AI Studio/Provider/Mistral/ProviderMistral.cs

@@ -70,22 +70,29 @@ public sealed class ProviderMistral(ILogger logger) : BaseProvider("https://api.
             SafePrompt = false,
         }, JSON_SERIALIZER_OPTIONS);
 
-        // Build the HTTP post request:
-        var request = new HttpRequestMessage(HttpMethod.Post, "chat/completions");
-        
-        // Set the authorization header:
-        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
-        
-        // Set the content:
-        request.Content = new StringContent(mistralChatRequest, Encoding.UTF8, "application/json");
-        
-        // Send the request with the ResponseHeadersRead option.
-        // This allows us to read the stream as soon as the headers are received.
-        // This is important because we want to stream the responses.
-        var response = await this.httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, token);
+        async Task<HttpRequestMessage> RequestBuilder()
+        {
+            // Build the HTTP post request:
+            var request = new HttpRequestMessage(HttpMethod.Post, "chat/completions");
+
+            // Set the authorization header:
+            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
+
+            // Set the content:
+            request.Content = new StringContent(mistralChatRequest, Encoding.UTF8, "application/json");
+            return request;
+        }
+
+        // Send the request using exponential backoff:
+        using var responseData = await this.SendRequest(RequestBuilder, token);
+        if(responseData.IsFailedAfterAllRetries)
+        {
+            this.logger.LogError($"Mistral chat completion failed: {responseData.ErrorMessage}");
+            yield break;
+        }
         
         // Open the response stream:
-        var mistralStream = await response.Content.ReadAsStreamAsync(token);
+        var mistralStream = await responseData.Response!.Content.ReadAsStreamAsync(token);
         
         // Add a stream reader to read the stream, line by line:
         var streamReader = new StreamReader(mistralStream);

app/MindWork AI Studio/Provider/OpenAI/ProviderOpenAI.cs

@@ -74,22 +74,29 @@ public sealed class ProviderOpenAI(ILogger logger) : BaseProvider("https://api.o
             FrequencyPenalty = 0f,
         }, JSON_SERIALIZER_OPTIONS);
 
-        // Build the HTTP post request:
-        var request = new HttpRequestMessage(HttpMethod.Post, "chat/completions");
-        
-        // Set the authorization header:
-        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
-        
-        // Set the content:
-        request.Content = new StringContent(openAIChatRequest, Encoding.UTF8, "application/json");
-        
-        // Send the request with the ResponseHeadersRead option.
-        // This allows us to read the stream as soon as the headers are received.
-        // This is important because we want to stream the responses.
-        var response = await this.httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, token);
+        async Task<HttpRequestMessage> RequestBuilder()
+        {
+            // Build the HTTP post request:
+            var request = new HttpRequestMessage(HttpMethod.Post, "chat/completions");
+
+            // Set the authorization header:
+            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
+
+            // Set the content:
+            request.Content = new StringContent(openAIChatRequest, Encoding.UTF8, "application/json");
+            return request;
+        }
         
+        // Send the request using exponential backoff:
+        using var responseData = await this.SendRequest(RequestBuilder, token);
+        if(responseData.IsFailedAfterAllRetries)
+        {
+            this.logger.LogError($"OpenAI chat completion failed: {responseData.ErrorMessage}");
+            yield break;
+        }
+
         // Open the response stream:
-        var openAIStream = await response.Content.ReadAsStreamAsync(token);
+        var openAIStream = await responseData.Response!.Content.ReadAsStreamAsync(token);
         
         // Add a stream reader to read the stream, line by line:
         var streamReader = new StreamReader(openAIStream);

app/MindWork AI Studio/Provider/SelfHosted/ProviderSelfHosted.cs

@@ -69,23 +69,30 @@ public sealed class ProviderSelfHosted(ILogger logger, Host host, string hostnam
         StreamReader? streamReader = default;
         try
         {
-            // Build the HTTP post request:
-            var request = new HttpRequestMessage(HttpMethod.Post, host.ChatURL());
+            async Task<HttpRequestMessage> RequestBuilder()
+            {
+                // Build the HTTP post request:
+                var request = new HttpRequestMessage(HttpMethod.Post, host.ChatURL());
 
-            // Set the authorization header:
-            if (requestedSecret.Success)
-                request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
+                // Set the authorization header:
+                if (requestedSecret.Success)
+                    request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", await requestedSecret.Secret.Decrypt(ENCRYPTION));
 
-            // Set the content:
-            request.Content = new StringContent(providerChatRequest, Encoding.UTF8, "application/json");
-
-            // Send the request with the ResponseHeadersRead option.
-            // This allows us to read the stream as soon as the headers are received.
-            // This is important because we want to stream the responses.
-            var response = await this.httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, token);
+                // Set the content:
+                request.Content = new StringContent(providerChatRequest, Encoding.UTF8, "application/json");
+                return request;
+            }
+            
+            // Send the request using exponential backoff:
+            using var responseData = await this.SendRequest(RequestBuilder, token);
+            if(responseData.IsFailedAfterAllRetries)
+            {
+                this.logger.LogError($"Self-hosted provider's chat completion failed: {responseData.ErrorMessage}");
+                yield break;
+            }
 
             // Open the response stream:
-            var providerStream = await response.Content.ReadAsStreamAsync(token);
+            var providerStream = await responseData.Response!.Content.ReadAsStreamAsync(token);
 
             // Add a stream reader to read the stream, line by line:
             streamReader = new StreamReader(providerStream);