Implement IsRunning() as health checks

Fixes #32

OllamaApiConsole/Program.cs

@@ -6,7 +6,7 @@
 AnsiConsole.Write(new Rule("OllamaSharp Api Console").LeftJustified());
 AnsiConsole.WriteLine();
 
-OllamaApiClient ollama;
+OllamaApiClient ollama = null;
 var connected = false;
 
 do
@@ -27,15 +27,14 @@
 	var uri = new Uri(url);
 	Console.WriteLine($"Connecting to {uri} ...");
 
-	ollama = new OllamaApiClient(url);
-
 	try
 	{
+		ollama = new OllamaApiClient(url);
+		connected = await ollama.IsRunning();
+
 		var models = await ollama.ListLocalModels();
 		if (!models.Any())
 			AnsiConsole.MarkupLineInterpolated($"[yellow]Your Ollama instance does not provide any models :([/]");
-
-		connected = true;
 	}
 	catch (Exception ex)
 	{
@@ -44,7 +43,6 @@
 	}
 } while (!connected);
 
-
 string demo;
 
 do

src/IOllamaApiClient.cs

@@ -120,5 +120,11 @@ public interface IOllamaApiClient
 		/// Should be reused for further calls to this method to keep a chat going.
 		/// </returns>
 		Task<ConversationContext> StreamCompletion(GenerateCompletionRequest request, IResponseStreamer<GenerateCompletionResponseStream> streamer, CancellationToken cancellationToken = default);
+
+		/// <summary>
+		/// Sends a query to check whether the Ollama api is running or not
+		/// </summary>
+		/// <param name="cancellationToken">The token to cancel the operation with</param>
+		Task<bool> IsRunning(CancellationToken cancellationToken = default);
 	}
 }

src/OllamaApiClient.cs

@@ -124,6 +124,14 @@ public async Task<IEnumerable<Message>> SendChat(ChatRequest chatRequest, IRespo
 			return await ProcessStreamedChatResponseAsync(chatRequest, response, streamer, cancellationToken);
 		}
 
+		public async Task<bool> IsRunning(CancellationToken cancellationToken = default)
+		{
+			var response = await _client.GetAsync("", cancellationToken); // without route returns "Ollama is running"
+			response.EnsureSuccessStatusCode();
+			var stringContent = await response.Content.ReadAsStringAsync();
+			return !string.IsNullOrWhiteSpace(stringContent);
+		}
+
 		private async Task<ConversationContext> GenerateCompletion(GenerateCompletionRequest generateRequest, IResponseStreamer<GenerateCompletionResponseStream> streamer, CancellationToken cancellationToken)
 		{
 			var request = new HttpRequestMessage(HttpMethod.Post, "api/generate")
@@ -145,6 +153,7 @@ private async Task<TResponse> GetAsync<TResponse>(string endpoint, CancellationT
 			response.EnsureSuccessStatusCode();
 
 			var responseBody = await response.Content.ReadAsStringAsync();
+
 			return JsonSerializer.Deserialize<TResponse>(responseBody);
 		}