feat: support bedrock prompt caching

src/providers/anthropic/chatComplete.ts

@@ -3,8 +3,8 @@ import {
   Params,
   Message,
   ContentType,
-  AnthropicPromptCache,
   SYSTEM_MESSAGE_ROLES,
+  PromptCache,
 } from '../../types/requestBody';
 import {
   ChatCompletionResponse,
@@ -19,7 +19,7 @@ import { AnthropicStreamState } from './types';
 
 // TODO: this configuration does not enforce the maximum token limit for the input parameter. If you want to enforce this, you might need to add a custom validation function or a max property to the ParameterConfig interface, and then use it in the input configuration. However, this might be complex because the token count is not a simple length check, but depends on the specific tokenization method used by the model.
 
-interface AnthropicTool extends AnthropicPromptCache {
+interface AnthropicTool extends PromptCache {
   name: string;
   description: string;
   input_schema: {
@@ -69,7 +69,7 @@ type AnthropicMessageContentItem =
   | AnthropicUrlImageContentItem
   | AnthropicTextContentItem;
 
-interface AnthropicMessage extends Message, AnthropicPromptCache {
+interface AnthropicMessage extends Message, PromptCache {
   content: AnthropicMessageContentItem[];
 }
 
@@ -180,7 +180,7 @@ export const AnthropicChatCompleteConfig: ProviderConfig = {
         let messages: AnthropicMessage[] = [];
         // Transform the chat messages into a simple prompt
         if (!!params.messages) {
-          params.messages.forEach((msg: Message & AnthropicPromptCache) => {
+          params.messages.forEach((msg: Message & PromptCache) => {
             if (SYSTEM_MESSAGE_ROLES.includes(msg.role)) return;
 
             if (msg.role === 'assistant') {
@@ -230,7 +230,7 @@ export const AnthropicChatCompleteConfig: ProviderConfig = {
         let systemMessages: AnthropicMessageContentItem[] = [];
         // Transform the chat messages into a simple prompt
         if (!!params.messages) {
-          params.messages.forEach((msg: Message & AnthropicPromptCache) => {
+          params.messages.forEach((msg: Message & PromptCache) => {
             if (
               SYSTEM_MESSAGE_ROLES.includes(msg.role) &&
               msg.content &&

src/providers/bedrock/chatComplete.ts

@@ -69,15 +69,30 @@ export interface BedrockConverseAI21ChatCompletionsParams
   countPenalty?: number;
 }
 
-const getMessageTextContentArray = (message: Message): { text: string }[] => {
+const getMessageTextContentArray = (
+  message: Message
+): Array<{ text: string } | { cachePoint: { type: string } }> => {
   if (message.content && typeof message.content === 'object') {
-    return message.content
-      .filter((item) => item.type === 'text')
-      .map((item) => {
-        return {
-          text: item.text || '',
-        };
+    const filteredContentMessages = message.content.filter(
+      (item) => item.type === 'text'
+    );
+    const finalContent: Array<
+      { text: string } | { cachePoint: { type: string } }
+    > = [];
+    filteredContentMessages.forEach((item) => {
+      finalContent.push({
+        text: item.text || '',
       });
+      // push a cache point.
+      if (item.cache_control) {
+        finalContent.push({
+          cachePoint: {
+            type: 'default',
+          },
+        });
+      }
+    });
+    return finalContent;
   }
   return [
     {
@@ -162,6 +177,15 @@ const getMessageContent = (message: Message) => {
           });
         }
       }
+
+      if (item.cache_control) {
+        // if content item has `cache_control`, push the cache point to the out array
+        out.push({
+          cachePoint: {
+            type: 'default',
+          },
+        });
+      }
     });
   }
 
@@ -219,7 +243,10 @@ export const BedrockConverseChatCompleteConfig: ProviderConfig = {
       transform: (params: BedrockChatCompletionsParams) => {
         if (!params.messages) return;
         const systemMessages = params.messages.reduce(
-          (acc: { text: string }[], msg) => {
+          (
+            acc: Array<{ text: string } | { cachePoint: { type: string } }>,
+            msg
+          ) => {
             if (SYSTEM_MESSAGE_ROLES.includes(msg.role))
               return acc.concat(...getMessageTextContentArray(msg));
             return acc;
@@ -234,17 +261,29 @@ export const BedrockConverseChatCompleteConfig: ProviderConfig = {
   tools: {
     param: 'toolConfig',
     transform: (params: BedrockChatCompletionsParams) => {
-      const toolConfig = {
-        tools: params.tools?.map((tool) => {
-          if (!tool.function) return;
-          return {
-            toolSpec: {
-              name: tool.function.name,
-              description: tool.function.description,
-              inputSchema: { json: tool.function.parameters },
+      const canBeAmazonModel = params.model?.includes('amazon');
+      const tools: Array<
+        | { toolSpec: { name: string; description?: string; inputSchema: any } }
+        | { cachePoint: { type: string } }
+      > = [];
+      params.tools?.forEach((tool) => {
+        tools.push({
+          toolSpec: {
+            name: tool.function.name,
+            description: tool.function.description,
+            inputSchema: { json: tool.function.parameters },
+          },
+        });
+        if (tool.cache_control && !canBeAmazonModel) {
+          tools.push({
+            cachePoint: {
+              type: 'default',
             },
-          };
-        }),
+          });
+        }
+      });
+      const toolConfig = {
+        tools: tools,
       };
       let toolChoice = undefined;
       if (params.tool_choice) {
@@ -341,6 +380,9 @@ type BedrockContentItem = {
       bytes: string;
     };
   };
+  cachePoint?: {
+    type: string;
+  };
 };
 
 interface BedrockChatCompletionResponse {
@@ -358,6 +400,10 @@ interface BedrockChatCompletionResponse {
     inputTokens: number;
     outputTokens: number;
     totalTokens: number;
+    cacheReadInputTokenCount?: number;
+    cacheReadInputTokens?: number;
+    cacheWriteInputTokenCount?: number;
+    cacheWriteInputTokens?: number;
   };
 }
 
@@ -421,6 +467,10 @@ export const BedrockChatCompleteResponseTransform: (
   }
 
   if ('output' in response) {
+    const shouldSendCacheUsage =
+      response.usage.cacheWriteInputTokens ||
+      response.usage.cacheReadInputTokens;
+
     let content: string = '';
     content = response.output.message.content
       .filter((item) => item.text)
@@ -453,6 +503,10 @@ export const BedrockChatCompleteResponseTransform: (
         prompt_tokens: response.usage.inputTokens,
         completion_tokens: response.usage.outputTokens,
         total_tokens: response.usage.totalTokens,
+        ...(shouldSendCacheUsage && {
+          cache_read_input_tokens: response.usage.cacheReadInputTokens,
+          cache_creation_input_tokens: response.usage.cacheWriteInputTokens,
+        }),
       },
     };
     const toolCalls = response.output.message.content
@@ -503,6 +557,10 @@ export interface BedrockChatCompleteStreamChunk {
     inputTokens: number;
     outputTokens: number;
     totalTokens: number;
+    cacheReadInputTokenCount?: number;
+    cacheReadInputTokens?: number;
+    cacheWriteInputTokenCount?: number;
+    cacheWriteInputTokens?: number;
   };
 }
 
@@ -534,6 +592,9 @@ export const BedrockChatCompleteStreamChunkTransform: (
   }
 
   if (parsedChunk.usage) {
+    const shouldSendCacheUsage =
+      parsedChunk.usage.cacheWriteInputTokens ||
+      parsedChunk.usage.cacheReadInputTokens;
     return [
       `data: ${JSON.stringify({
         id: fallbackId,
@@ -552,6 +613,11 @@ export const BedrockChatCompleteStreamChunkTransform: (
           prompt_tokens: parsedChunk.usage.inputTokens,
           completion_tokens: parsedChunk.usage.outputTokens,
           total_tokens: parsedChunk.usage.totalTokens,
+          ...(shouldSendCacheUsage && {
+            cache_read_input_tokens: parsedChunk.usage.cacheReadInputTokens,
+            cache_creation_input_tokens:
+              parsedChunk.usage.cacheWriteInputTokens,
+          }),
         },
       })}\n\n`,
       `data: [DONE]\n\n`,

src/types/requestBody.ts

@@ -219,7 +219,7 @@ export interface Config {
  * A message content type.
  * @interface
  */
-export interface ContentType {
+export interface ContentType extends PromptCache {
   type: string;
   text?: string;
   thinking?: string;
@@ -285,7 +285,7 @@ export interface Message {
   citationMetadata?: CitationMetadata;
 }
 
-export interface AnthropicPromptCache {
+export interface PromptCache {
   cache_control?: { type: 'ephemeral' };
 }
 
@@ -340,7 +340,7 @@ export type ToolChoice = ToolChoiceObject | 'none' | 'auto' | 'required';
  *
  * @interface
  */
-export interface Tool extends AnthropicPromptCache {
+export interface Tool extends PromptCache {
   /** The name of the function. */
   type: string;
   /** A description of the function. */