Add custom instructions to readme

gov2/bedrock-runtime/README.md

@@ -59,8 +59,14 @@ functions within the same service.
 
 
 <!--custom.instructions.start-->
+#### Region configuration
+By default, examples are set to `us-east-1`. To specify a different region, use the `-region` flag as shown in this example:
 
-> **Note:** These examples use the region `us-east-1`. To change the region, 
+```
+go run ./cmd -scenario=invokemodel -region=eu-central-1
+```
+
+Be aware that not all regions may support Bedrock and its models, yet. Verify service availability for your region [here](https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/). For available models per region, refer to the [AWS Management Console](https://console.aws.amazon.com/bedrock).
 <!--custom.instructions.end-->
 
 #### Hello Amazon Bedrock

gov2/bedrock-runtime/actions/invoke_model.go

@@ -72,11 +72,11 @@ func (wrapper InvokeModelWrapper) InvokeClaude(prompt string) (string, error) {
 	if err != nil {
         errMsg := err.Error()
         if strings.Contains(errMsg, "no such host") {
-            log.Printf("The Bedrock service is not available in the selected region. Please double-check the service availability for your region at https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/.\n")
+            fmt.Printf("The Bedrock service is not available in the selected region. Please double-check the service availability for your region at https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/.\n")
         } else if strings.Contains(errMsg, "Could not resolve the foundation model") {
-            log.Printf("Could not resolve the foundation model from model identifier: \"%v\". Please verify that the requested model exists and is accessible within the specified region.\n", modelId)
+            fmt.Printf("Could not resolve the foundation model from model identifier: \"%v\". Please verify that the requested model exists and is accessible within the specified region.\n", modelId)
         } else {
-            log.Printf("Couldn't invoke Anthropic Claude. Here's why: %v\n", err)
+            fmt.Printf("Couldn't invoke Anthropic Claude. Here's why: %v\n", err)
         }
         os.Exit(1)
     }
@@ -135,11 +135,11 @@ func (wrapper InvokeModelWrapper) InvokeJurassic2(prompt string) (string, error)
 	if err != nil {
     	errMsg := err.Error()
     	if strings.Contains(errMsg, "no such host") {
-    		log.Printf("The Bedrock service is not available in the selected region. Please double-check the service availability for your region at https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/.\n")
+    		fmt.Printf("The Bedrock service is not available in the selected region. Please double-check the service availability for your region at https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/.\n")
     	} else if strings.Contains(errMsg, "Could not resolve the foundation model") {
-    	    log.Printf("Could not resolve the foundation model from model identifier: \"%v\". Please verify that the requested model exists and is accessible within the specified region.\n", modelId)
+    	    fmt.Printf("Could not resolve the foundation model from model identifier: \"%v\". Please verify that the requested model exists and is accessible within the specified region.\n", modelId)
     	} else {
-            log.Printf("Couldn't invoke AI21 Labs Jurassic-2. Here's why: %v\n", err)
+            fmt.Printf("Couldn't invoke AI21 Labs Jurassic-2. Here's why: %v\n", err)
         }
         os.Exit(1)
     }
@@ -196,11 +196,11 @@ func (wrapper InvokeModelWrapper) InvokeLlama2(prompt string) (string, error) {
 	if err != nil {
         errMsg := err.Error()
         if strings.Contains(errMsg, "no such host") {
-            log.Printf("The Bedrock service is not available in the selected region. Please double-check the service availability for your region at https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/.\n")
+            fmt.Printf("The Bedrock service is not available in the selected region. Please double-check the service availability for your region at https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/.\n")
         } else if strings.Contains(errMsg, "Could not resolve the foundation model") {
-            log.Printf("Could not resolve the foundation model from model identifier: \"%v\". Please verify that the requested model exists and is accessible within the specified region.\n", modelId)
+            fmt.Printf("Could not resolve the foundation model from model identifier: \"%v\". Please verify that the requested model exists and is accessible within the specified region.\n", modelId)
         } else {
-            log.Printf("Couldn't invoke Meta Llama 2. Here's why: %v\n", err)
+            fmt.Printf("Couldn't invoke Meta Llama 2. Here's why: %v\n", err)
         }
         os.Exit(1)
     }

gov2/bedrock-runtime/actions/invoke_model_with_response_stream.go

@@ -74,11 +74,11 @@ func (wrapper InvokeModelWithResponseStreamWrapper) InvokeModelWithResponseStrea
 	if err != nil {
         errMsg := err.Error()
         if strings.Contains(errMsg, "no such host") {
-            log.Printf("The Bedrock service is not available in the selected region. Please double-check the service availability for your region at https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/.\n")
+            fmt.Printf("The Bedrock service is not available in the selected region. Please double-check the service availability for your region at https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/.\n")
         } else if strings.Contains(errMsg, "Could not resolve the foundation model") {
-            log.Printf("Could not resolve the foundation model from model identifier: \"%v\". Please verify that the requested model exists and is accessible within the specified region.\n", modelId)
+            fmt.Printf("Could not resolve the foundation model from model identifier: \"%v\". Please verify that the requested model exists and is accessible within the specified region.\n", modelId)
         } else {
-            log.Printf("Couldn't invoke Anthropic Claude. Here's why: %v\n", err)
+            fmt.Printf("Couldn't invoke Anthropic Claude. Here's why: %v\n", err)
         }
         os.Exit(1)
     }

gov2/bedrock-runtime/hello/hello.go

@@ -11,6 +11,8 @@ import (
 	"flag"
 	"fmt"
 	"log"
+	"os"
+	"strings"
 
 	"github.com/aws/aws-sdk-go-v2/aws"
 	"github.com/aws/aws-sdk-go-v2/config"
@@ -52,8 +54,9 @@ func main() {
 
 	client := bedrockruntime.NewFromConfig(sdkConfig)
 
+	modelId := "anthropic.claude-v2"
+
 	prompt := "Hello, how are you today?"
-	fmt.Println("Prompt:\n", prompt)
 
 	// Anthropic Claude requires you to enclose the prompt as follows:
 	prefix := "Human: "
@@ -68,14 +71,22 @@ func main() {
 	body, err := json.Marshal(request)
 
 	result, err := client.InvokeModel(context.Background(), &bedrockruntime.InvokeModelInput {
-		ModelId:     aws.String("anthropic.claude-v2"),
+		ModelId:     aws.String(modelId),
 		ContentType: aws.String("application/json"),
 		Body:        body,
 	})
 
 	if err != nil {
-		log.Printf("Couldn't invoke Anthropic Claude. Here's why: %v\n", err)
-	}
+        errMsg := err.Error()
+        if strings.Contains(errMsg, "no such host") {
+            fmt.Printf("Error: The Bedrock service is not available in the selected region. Please double-check the service availability for your region at https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/.\n")
+        } else if strings.Contains(errMsg, "Could not resolve the foundation model") {
+            fmt.Printf("Error: Could not resolve the foundation model from model identifier: \"%v\". Please verify that the requested model exists and is accessible within the specified region.\n", modelId)
+        } else {
+            fmt.Printf("Error: Couldn't invoke Anthropic Claude. Here's why: %v\n", err)
+        }
+        os.Exit(1)
+    }
 
 	var response ClaudeResponse
 
@@ -85,6 +96,7 @@ func main() {
 		log.Fatal("failed to unmarshal", err)
 	}
 
+    fmt.Println("Prompt:\n", prompt)
 	fmt.Println("Response from Anthropic Claude:\n", response.Completion)
 }