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// +build example
package main
import (
"flag"
"fmt"
"os"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute"
)
func exitWithError(err error) {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
func main() {
cfg := Config{}
if err := cfg.Load(); err != nil {
exitWithError(fmt.Errorf("failed to load config, %v", err))
}
// Create the config specifying the Region for the DynamoDB table.
// If Config.Region is not set the region must come from the shared
// config or AWS_REGION environment variable.
awscfg := &aws.Config{}
if len(cfg.Region) > 0 {
awscfg.WithRegion(cfg.Region)
}
// Create the session that the DynamoDB service will use.
sess := session.Must(session.NewSession(awscfg))
// Create the DynamoDB service client to make the query request with.
svc := dynamodb.New(sess)
// Build the query input parameters
params := &dynamodb.ScanInput{
TableName: aws.String(cfg.Table),
}
if cfg.Limit > 0 {
params.Limit = aws.Int64(cfg.Limit)
}
// Make the DynamoDB Query API call
result, err := svc.Scan(params)
if err != nil {
exitWithError(fmt.Errorf("failed to make Query API call, %v", err))
}
items := []Item{}
// Unmarshal the Items field in the result value to the Item Go type.
err = dynamodbattribute.UnmarshalListOfMaps(result.Items, &items)
if err != nil {
exitWithError(fmt.Errorf("failed to unmarshal Query result items, %v", err))
}
// Print out the items returned
for i, item := range items {
fmt.Printf("%d: Key: %d, Desc: %s\n", i, item.Key, item.Desc)
fmt.Printf("\tNum Data Values: %d\n", len(item.Data))
for k, v := range item.Data {
fmt.Printf("\t- %q: %v\n", k, v)
}
}
}
type Item struct {
Key int
Desc string
Data map[string]interface{}
}
type Config struct {
Table string // required
Region string // optional
Limit int64 // optional
}
func (c *Config) Load() error {
flag.Int64Var(&c.Limit, "limit", 0, "Limit is the max items to be returned, 0 is no limit")
flag.StringVar(&c.Table, "table", "", "Table to Query on")
flag.StringVar(&c.Region, "region", "", "AWS Region the table is in")
flag.Parse()
if len(c.Table) == 0 {
flag.PrintDefaults()
return fmt.Errorf("table name is required.")
}
return nil
}
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