Added first Go V2 code example with unit test for DynamoDB

Author: Doug-AWS

gov2/dynamodb/DescribeTable/DescribeTable.exe

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+
+	"github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
+)
+
+// DynamoDBDescribeTableAPI defines the interface for DescribeTable function
+type DynamoDBDescribeTableAPI interface {
+	DescribeTable(ctx context.Context,
+		params *dynamodb.DescribeTableInput,
+		optFns ...func(*dynamodb.Options)) (*dynamodb.DescribeTableOutput, error)
+}
+
+// GetTableInfo retrieves information about the tabl
+func GetTableInfo(c context.Context, api DynamoDBDescribeTableAPI, input *dynamodb.DescribeTableInput) (*dynamodb.DescribeTableOutput, error) {
+	resp, err := api.DescribeTable(c, input)
+
+	return resp, err
+}
+
+func main() {
+	table := flag.String("t", "", "The name of the table")
+	region := flag.String("r", "us-west-2", "The region")
+	flag.Parse()
+
+	if *table == "" {
+		fmt.Println("You must specify a table name (-t TABLE)")
+		return
+	}
+
+	// Using the SDK's default configuration, loading additional config
+	// and credentials values from the environment variables, shared
+	// credentials, and shared configuration files
+	cfg, err := config.LoadDefaultConfig(config.WithRegion(*region))
+	if err != nil {
+		panic("unable to load SDK config, " + err.Error())
+	}
+
+	// Using the Config value, create the DynamoDB client
+	// Create a new DynamoDB Service Client
+	client := dynamodb.NewFromConfig(cfg)
+
+	// Build the request with its input parameters
+	resp, err := client.DescribeTable(context.Background(), &dynamodb.DescribeTableInput{
+		TableName: table,
+	})
+	if err != nil {
+		panic("failed to describe table, " + err.Error())
+	}
+
+	fmt.Println("Info about " + *table + ":")
+	fmt.Println("  #items:     ", *resp.Table.ItemCount)
+	fmt.Println("  Size (bytes)", *resp.Table.TableSizeBytes)
+	fmt.Println("  Status:     ", string(resp.Table.TableStatus))
+}

gov2/dynamodb/DescribeTable/DescribeTable.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"context"
+	"testing"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+
+	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
+	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
+)
+
+type DynamoDBDescribeTableImpl struct{}
+
+func (dt DynamoDBDescribeTableImpl) DescribeTable(ctx context.Context,
+	params *dynamodb.DescribeTableInput,
+	optFns ...func(*dynamodb.Options)) (*dynamodb.DescribeTableOutput, error) {
+	desc := &types.TableDescription{
+		ItemCount:      aws.Int64(1),
+		TableSizeBytes: aws.Int64(64),
+		TableStatus:    "Active",
+	}
+
+	output := &dynamodb.DescribeTableOutput{
+		Table: desc,
+	}
+
+	return output, nil
+}
+
+func TestDescribeTable(t *testing.T) {
+	tableName := "MyGroovyTable"
+
+	// Build the request with its input parameters
+	input := dynamodb.DescribeTableInput{
+		TableName: &tableName,
+	}
+
+	api := &DynamoDBDescribeTableImpl{}
+
+	resp, err := GetTableInfo(context.Background(), *api, &input)
+	if err != nil {
+		t.Log("Got an error retrieving the table status:")
+		t.Log(err)
+		return
+	}
+
+	t.Log("Info about " + tableName + ":")
+	t.Log("  #items:     ", *resp.Table.ItemCount)
+	t.Log("  Size (bytes)", *resp.Table.TableSizeBytes)
+	t.Log("  Status:     ", string(resp.Table.TableStatus))
+}