Add Amazon Bedrock Mistral model support.

Author: wmz7year

README.md

@@ -88,7 +88,7 @@ You can find more details in the [Reference Documentation](https://docs.spring.i
 Spring AI supports many AI models.  For an overview see here.  Specific models currently supported are
 * OpenAI
 * Azure OpenAI
-* Amazon Bedrock (Anthropic, Llama, Cohere, Titan, Jurassic2)
+* Amazon Bedrock (Anthropic, Llama, Cohere, Titan, Jurassic2, Mistral)
 * HuggingFace
 * Google VertexAI (PaLM2, Gemini)
 * Mistral AI

models/spring-ai-bedrock/README.md

@@ -8,4 +8,5 @@
 - [Titan Chat Documentation](https://docs.spring.io/spring-ai/reference/1.0-SNAPSHOT/api/chat/bedrock/bedrock-titan.html)
 - [Titan Embedding Documentation](https://docs.spring.io/spring-ai/reference/1.0-SNAPSHOT/api/embeddings/bedrock-titan-embedding.html)
 - [Jurassic2 Chat Documentation](https://docs.spring.io/spring-ai/reference/1.0-SNAPSHOT/api/chat/bedrock/bedrock-jurassic2.html)
+- [Mistral Chat Documentation](https://docs.spring.io/spring-ai/reference/1.0-SNAPSHOT/api/chat/bedrock/bedrock-mistral.html)
 

models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/mistral/BedrockMistralChatModel.java

@@ -0,0 +1,297 @@
+/*
+ * Copyright 2023 - 2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.ai.bedrock.mistral;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.springframework.ai.bedrock.BedrockConverseChatGenerationMetadata;
+import org.springframework.ai.bedrock.api.BedrockConverseApi;
+import org.springframework.ai.bedrock.api.BedrockConverseApiUtils;
+import org.springframework.ai.bedrock.api.BedrockConverseApi.BedrockConverseRequest;
+import org.springframework.ai.chat.model.ChatModel;
+import org.springframework.ai.chat.model.ChatResponse;
+import org.springframework.ai.chat.model.Generation;
+import org.springframework.ai.chat.model.StreamingChatModel;
+import org.springframework.ai.chat.prompt.ChatOptions;
+import org.springframework.ai.chat.prompt.Prompt;
+import org.springframework.ai.model.ModelDescription;
+import org.springframework.ai.model.ModelOptionsUtils;
+import org.springframework.ai.model.function.AbstractFunctionCallSupport;
+import org.springframework.ai.model.function.FunctionCallbackContext;
+import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
+
+import reactor.core.publisher.Flux;
+import software.amazon.awssdk.services.bedrockruntime.model.ContentBlock;
+import software.amazon.awssdk.services.bedrockruntime.model.ConversationRole;
+import software.amazon.awssdk.services.bedrockruntime.model.Message;
+import software.amazon.awssdk.services.bedrockruntime.model.StopReason;
+import software.amazon.awssdk.services.bedrockruntime.model.Tool;
+import software.amazon.awssdk.services.bedrockruntime.model.ToolConfiguration;
+import software.amazon.awssdk.services.bedrockruntime.model.ToolInputSchema;
+import software.amazon.awssdk.services.bedrockruntime.model.ToolResultBlock;
+import software.amazon.awssdk.services.bedrockruntime.model.ToolResultContentBlock;
+import software.amazon.awssdk.services.bedrockruntime.model.ToolResultStatus;
+import software.amazon.awssdk.services.bedrockruntime.model.ToolSpecification;
+import software.amazon.awssdk.services.bedrockruntime.model.ToolUseBlock;
+import software.amazon.awssdk.services.bedrockruntime.model.ContentBlock.Type;
+
+/**
+ * Java {@link ChatModel} and {@link StreamingChatModel} for the Bedrock Mistral chat
+ * generative model.
+ *
+ * @author Wei Jiang
+ * @since 1.0.0
+ */
+public class BedrockMistralChatModel extends AbstractFunctionCallSupport<Message, BedrockConverseRequest, ChatResponse>
+		implements ChatModel, StreamingChatModel {
+
+	private final String modelId;
+
+	private final BedrockConverseApi converseApi;
+
+	private final BedrockMistralChatOptions defaultOptions;
+
+	public BedrockMistralChatModel(BedrockConverseApi converseApi) {
+		this(converseApi, BedrockMistralChatOptions.builder().build());
+	}
+
+	public BedrockMistralChatModel(BedrockConverseApi converseApi, BedrockMistralChatOptions options) {
+		this(MistralChatModel.MISTRAL_LARGE.id(), converseApi, options);
+	}
+
+	public BedrockMistralChatModel(String modelId, BedrockConverseApi converseApi, BedrockMistralChatOptions options) {
+		this(modelId, converseApi, options, null);
+	}
+
+	public BedrockMistralChatModel(String modelId, BedrockConverseApi converseApi, BedrockMistralChatOptions options,
+			FunctionCallbackContext functionCallbackContext) {
+		super(functionCallbackContext);
+
+		Assert.notNull(modelId, "modelId must not be null.");
+		Assert.notNull(converseApi, "BedrockConverseApi must not be null.");
+		Assert.notNull(options, "BedrockMistralChatOptions must not be null.");
+
+		this.modelId = modelId;
+		this.converseApi = converseApi;
+		this.defaultOptions = options;
+	}
+
+	@Override
+	public ChatResponse call(Prompt prompt) {
+		Assert.notNull(prompt, "Prompt must not be null.");
+
+		var request = createBedrockConverseRequest(prompt);
+
+		return this.callWithFunctionSupport(request);
+	}
+
+	@Override
+	public Flux<ChatResponse> stream(Prompt prompt) {
+		Assert.notNull(prompt, "Prompt must not be null.");
+
+		var request = createBedrockConverseRequest(prompt);
+
+		return converseApi.converseStream(request);
+	}
+
+	private BedrockConverseRequest createBedrockConverseRequest(Prompt prompt) {
+		var request = BedrockConverseApiUtils.createBedrockConverseRequest(modelId, prompt, defaultOptions);
+
+		ToolConfiguration toolConfiguration = createToolConfiguration(prompt);
+
+		return BedrockConverseRequest.from(request).withToolConfiguration(toolConfiguration).build();
+	}
+
+	private ToolConfiguration createToolConfiguration(Prompt prompt) {
+		Set<String> functionsForThisRequest = new HashSet<>();
+
+		if (this.defaultOptions != null) {
+			Set<String> promptEnabledFunctions = this.handleFunctionCallbackConfigurations(this.defaultOptions,
+					!IS_RUNTIME_CALL);
+			functionsForThisRequest.addAll(promptEnabledFunctions);
+		}
+
+		if (prompt.getOptions() != null) {
+			if (prompt.getOptions() instanceof ChatOptions runtimeOptions) {
+				BedrockMistralChatOptions updatedRuntimeOptions = ModelOptionsUtils.copyToTarget(runtimeOptions,
+						ChatOptions.class, BedrockMistralChatOptions.class);
+
+				Set<String> defaultEnabledFunctions = this.handleFunctionCallbackConfigurations(updatedRuntimeOptions,
+						IS_RUNTIME_CALL);
+				functionsForThisRequest.addAll(defaultEnabledFunctions);
+			}
+			else {
+				throw new IllegalArgumentException("Prompt options are not of type ChatOptions: "
+						+ prompt.getOptions().getClass().getSimpleName());
+			}
+		}
+
+		if (!CollectionUtils.isEmpty(functionsForThisRequest)) {
+			return ToolConfiguration.builder().tools(getFunctionTools(functionsForThisRequest)).build();
+		}
+
+		return null;
+	}
+
+	private List<Tool> getFunctionTools(Set<String> functionNames) {
+		return this.resolveFunctionCallbacks(functionNames).stream().map(functionCallback -> {
+			var description = functionCallback.getDescription();
+			var name = functionCallback.getName();
+			String inputSchema = functionCallback.getInputTypeSchema();
+
+			return Tool.builder()
+				.toolSpec(ToolSpecification.builder()
+					.name(name)
+					.description(description)
+					.inputSchema(ToolInputSchema.builder()
+						.json(BedrockConverseApiUtils.convertObjectToDocument(ModelOptionsUtils.jsonToMap(inputSchema)))
+						.build())
+					.build())
+				.build();
+		}).toList();
+	}
+
+	@Override
+	public ChatOptions getDefaultOptions() {
+		return defaultOptions;
+	}
+
+	@Override
+	protected BedrockConverseRequest doCreateToolResponseRequest(BedrockConverseRequest previousRequest,
+			Message responseMessage, List<Message> conversationHistory) {
+		List<ToolUseBlock> toolToUseList = responseMessage.content()
+			.stream()
+			.filter(content -> content.type() == Type.TOOL_USE)
+			.map(content -> content.toolUse())
+			.toList();
+
+		List<ToolResultBlock> toolResults = new ArrayList<>();
+
+		for (ToolUseBlock toolToUse : toolToUseList) {
+			var functionCallId = toolToUse.toolUseId();
+			var functionName = toolToUse.name();
+			var functionArguments = toolToUse.input().unwrap();
+
+			if (!this.functionCallbackRegister.containsKey(functionName)) {
+				throw new IllegalStateException("No function callback found for function name: " + functionName);
+			}
+
+			String functionResponse = this.functionCallbackRegister.get(functionName)
+				.call(ModelOptionsUtils.toJsonString(functionArguments));
+
+			toolResults.add(ToolResultBlock.builder()
+				.toolUseId(functionCallId)
+				.status(ToolResultStatus.SUCCESS)
+				.content(ToolResultContentBlock.builder().text(functionResponse).build())
+				.build());
+		}
+
+		// Add the function response to the conversation.
+		Message toolResultMessage = Message.builder()
+			.content(toolResults.stream().map(toolResult -> ContentBlock.fromToolResult(toolResult)).toList())
+			.role(ConversationRole.USER)
+			.build();
+		conversationHistory.add(toolResultMessage);
+
+		// Recursively call chatCompletionWithTools until the model doesn't call a
+		// functions anymore.
+		return BedrockConverseRequest.from(previousRequest).withMessages(conversationHistory).build();
+	}
+
+	@Override
+	protected List<Message> doGetUserMessages(BedrockConverseRequest request) {
+		return request.messages();
+	}
+
+	@Override
+	protected Message doGetToolResponseMessage(ChatResponse response) {
+		Generation result = response.getResult();
+
+		var metadata = (BedrockConverseChatGenerationMetadata) result.getMetadata();
+
+		return metadata.getMessage();
+	}
+
+	@Override
+	protected ChatResponse doChatCompletion(BedrockConverseRequest request) {
+		return converseApi.converse(request);
+	}
+
+	@Override
+	protected Flux<ChatResponse> doChatCompletionStream(BedrockConverseRequest request) {
+		throw new UnsupportedOperationException("Streaming function calling is not supported.");
+	}
+
+	@Override
+	protected boolean isToolFunctionCall(ChatResponse response) {
+		Generation result = response.getResult();
+		if (result == null) {
+			return false;
+		}
+
+		return StopReason.fromValue(result.getMetadata().getFinishReason()) == StopReason.TOOL_USE;
+	}
+
+	/**
+	 * Mistral models version.
+	 */
+	public enum MistralChatModel implements ModelDescription {
+
+		/**
+		 * mistral.mistral-7b-instruct-v0:2
+		 */
+		MISTRAL_7B_INSTRUCT("mistral.mistral-7b-instruct-v0:2"),
+
+		/**
+		 * mistral.mixtral-8x7b-instruct-v0:1
+		 */
+		MISTRAL_8X7B_INSTRUCT("mistral.mixtral-8x7b-instruct-v0:1"),
+
+		/**
+		 * mistral.mistral-large-2402-v1:0
+		 */
+		MISTRAL_LARGE("mistral.mistral-large-2402-v1:0"),
+
+		/**
+		 * mistral.mistral-small-2402-v1:0
+		 */
+		MISTRAL_SMALL("mistral.mistral-small-2402-v1:0");
+
+		private final String id;
+
+		/**
+		 * @return The model id.
+		 */
+		public String id() {
+			return id;
+		}
+
+		MistralChatModel(String value) {
+			this.id = value;
+		}
+
+		@Override
+		public String getModelName() {
+			return this.id;
+		}
+
+	}
+
+}