SDK for Go V2 を使用した Amazon Bedrock ランタイムの例

package main

import (
	"context"
	"flag"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime/types"
)

// main uses the AWS SDK for Go (v2) to create an Amazon Bedrock Runtime client
// and invokes Anthropic Claude using the Converse API.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {

	region := flag.String("region", "us-east-1", "The AWS region")
	flag.Parse()

	fmt.Printf("Using AWS region: %s\n", *region)

	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx, config.WithRegion(*region))
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}

	client := bedrockruntime.NewFromConfig(sdkConfig)

	// Set the model ID, e.g., Claude Haiku.
	// The "global." prefix enables cross-region inference, allowing the request
	// to be routed to the nearest available region for the specified model.
	modelId := "global.anthropic.claude-haiku-4-5-20251001-v1:0"

	// Start a conversation with the user message.
	prompt := "Hello. In a short paragraph, explain what you can do."

	message := types.Message{
		Content: []types.ContentBlock{
			&types.ContentBlockMemberText{Value: prompt},
		},
		Role: types.ConversationRoleUser,
	}

	fmt.Printf("Model: %s\n", modelId)
	fmt.Printf("Prompt: %s\n\n", prompt)

	result, err := client.Converse(ctx, &bedrockruntime.ConverseInput{
		ModelId:  aws.String(modelId),
		Messages: []types.Message{message},
	})

	if err != nil {
		log.Fatalf("ERROR: Can't invoke '%s'. Reason: %v\n", modelId, err)
	}

	// Extract and print the response text.
	responseMessage, ok := result.Output.(*types.ConverseOutputMemberMessage)
	if !ok {
		log.Fatal("ERROR: Unexpected output type from Converse API")
	}
	responseContentBlock := responseMessage.Value.Content[0]
	text, ok := responseContentBlock.(*types.ContentBlockMemberText)
	if !ok {
		log.Fatal("ERROR: Unexpected content block type from Converse API")
	}
	fmt.Printf("Response: %s\n", text.Value)
}

Bedrock の Converse API を使用して Amazon Nova にテキストメッセージを送信します。

func (wrapper ConverseWrapper) ConverseNova(ctx context.Context, prompt string) (string, error) {
	var content = types.ContentBlockMemberText{
		Value: prompt,
	}
	var message = types.Message{
		Content: []types.ContentBlock{&content},
		Role:    "user",
	}
	modelId := "amazon.nova-lite-v1:0"
	var converseInput = bedrockruntime.ConverseInput{
		ModelId:  aws.String(modelId),
		Messages: []types.Message{message},
	}
	response, err := wrapper.BedrockRuntimeClient.Converse(ctx, &converseInput)
	if err != nil {
		ProcessError(err, modelId)
	}

	responseText, _ := response.Output.(*types.ConverseOutputMemberMessage)
	responseContentBlock := responseText.Value.Content[0]
	text, _ := responseContentBlock.(*types.ContentBlockMemberText)
	return text.Value, nil
}

Amazon Titan Image Generator を使用して画像を作成します。

import (
	"context"
	"encoding/json"
	"log"
	"strings"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime"
)

// InvokeModelWrapper encapsulates Amazon Bedrock actions used in the examples.
// It contains a Bedrock Runtime client that is used to invoke foundation models.
type InvokeModelWrapper struct {
	BedrockRuntimeClient *bedrockruntime.Client
}



type TitanImageRequest struct {
	TaskType              string                `json:"taskType"`
	TextToImageParams     TextToImageParams     `json:"textToImageParams"`
	ImageGenerationConfig ImageGenerationConfig `json:"imageGenerationConfig"`
}
type TextToImageParams struct {
	Text string `json:"text"`
}
type ImageGenerationConfig struct {
	NumberOfImages int     `json:"numberOfImages"`
	Quality        string  `json:"quality"`
	CfgScale       float64 `json:"cfgScale"`
	Height         int     `json:"height"`
	Width          int     `json:"width"`
	Seed           int64   `json:"seed"`
}

type TitanImageResponse struct {
	Images []string `json:"images"`
}

// Invokes the Titan Image model to create an image using the input provided
// in the request body.
func (wrapper InvokeModelWrapper) InvokeTitanImage(ctx context.Context, prompt string, seed int64) (string, error) {
	modelId := "amazon.titan-image-generator-v2:0"

	body, err := json.Marshal(TitanImageRequest{
		TaskType: "TEXT_IMAGE",
		TextToImageParams: TextToImageParams{
			Text: prompt,
		},
		ImageGenerationConfig: ImageGenerationConfig{
			NumberOfImages: 1,
			Quality:        "standard",
			CfgScale:       8.0,
			Height:         512,
			Width:          512,
			Seed:           seed,
		},
	})

	if err != nil {
		log.Fatal("failed to marshal", err)
	}

	output, err := wrapper.BedrockRuntimeClient.InvokeModel(ctx, &bedrockruntime.InvokeModelInput{
		ModelId:     aws.String(modelId),
		ContentType: aws.String("application/json"),
		Body:        body,
	})

	if err != nil {
		ProcessError(err, modelId)
	}

	var response TitanImageResponse
	if err := json.Unmarshal(output.Body, &response); err != nil {
		log.Fatal("failed to unmarshal", err)
	}

	base64ImageData := response.Images[0]

	return base64ImageData, nil

}

Bedrock の Converse API を使用して、Anthropic Claude にテキストメッセージを送信します。

import (
	"context"
	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime/types"
)

// ConverseWrapper encapsulates Amazon Bedrock actions used in the examples.
// It contains a Bedrock Runtime client that is used to invoke Bedrock.
type ConverseWrapper struct {
	BedrockRuntimeClient *bedrockruntime.Client
}



func (wrapper ConverseWrapper) ConverseClaude(ctx context.Context, prompt string) (string, error) {
	var content = types.ContentBlockMemberText{
		Value: prompt,
	}
	var message = types.Message{
		Content: []types.ContentBlock{&content},
		Role:    "user",
	}
	modelId := "anthropic.claude-3-haiku-20240307-v1:0"
	var converseInput = bedrockruntime.ConverseInput{
		ModelId:  aws.String(modelId),
		Messages: []types.Message{message},
	}
	response, err := wrapper.BedrockRuntimeClient.Converse(ctx, &converseInput)
	if err != nil {
		ProcessError(err, modelId)
	}

	responseText, _ := response.Output.(*types.ConverseOutputMemberMessage)
	responseContentBlock := responseText.Value.Content[0]
	text, _ := responseContentBlock.(*types.ContentBlockMemberText)
	return text.Value, nil

}