/
main.go
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/
main.go
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// Copyright 2017 Matt Ho
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package main
import (
"flag"
"fmt"
"log"
"os"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/savaki/dynastore"
)
func main() {
var (
tableName = flag.String("table", dynastore.DefaultTableName, "DynamoDB table name")
ttl = flag.String("ttl", "ttl", "DynamoDB TTL field")
delete = flag.Bool("delete", false, "Delete the table")
readCapacity = flag.Int64("read", 5, "Provisioned DynamoDB Read capacity")
writeCapacity = flag.Int64("write", 5, "Provisioned DynamoDB Write capacity")
)
flag.Parse()
region := os.Getenv("AWS_DEFAULT_REGION")
if region == "" {
region = os.Getenv("AWS_REGION")
}
cfg := &aws.Config{Region: aws.String(region)}
s, err := session.NewSession(cfg)
if err != nil {
log.Fatalf("Unable to create AWS session - %v\n", err)
}
api := dynamodb.New(s)
if *delete {
fmt.Printf("Deleting dynamodb table, %v [%v]\n", *tableName, region)
_, err := api.DeleteTable(&dynamodb.DeleteTableInput{
TableName: tableName,
})
if err != nil {
fmt.Printf("** ERR *** unable to delete dynamodb table - %v\n", err)
os.Exit(1)
}
fmt.Println("Successfully deleted table")
} else {
fmt.Printf("Creating dynamodb table, %v [%v]\n", *tableName, region)
_, err := api.CreateTable(&dynamodb.CreateTableInput{
TableName: tableName,
AttributeDefinitions: []*dynamodb.AttributeDefinition{
{
AttributeName: aws.String("id"),
AttributeType: aws.String("S"),
},
},
KeySchema: []*dynamodb.KeySchemaElement{
{
AttributeName: aws.String("id"),
KeyType: aws.String("HASH"),
},
},
ProvisionedThroughput: &dynamodb.ProvisionedThroughput{
ReadCapacityUnits: readCapacity,
WriteCapacityUnits: writeCapacity,
},
})
if err != nil {
if v, ok := err.(awserr.Error); ok {
if v.Code() == "ResourceInUseException" {
fmt.Println("Table already exists")
return
}
}
fmt.Printf("** ERR *** unable to create dynamodb table - %v\n", err)
os.Exit(1)
}
fmt.Println("Successfully created table")
fmt.Printf("Configuring TTL on dynamodb table, %v [%v]\n", *tableName, region)
for i := 0; i < 12; i++ {
_, err = api.UpdateTimeToLive(&dynamodb.UpdateTimeToLiveInput{
TableName: tableName,
TimeToLiveSpecification: &dynamodb.TimeToLiveSpecification{
AttributeName: ttl,
Enabled: aws.Bool(true),
},
})
if err != nil {
if v, ok := err.(awserr.Error); ok {
if code := v.Code(); code == "ResourceNotFoundException" || code == "ResourceInUseException" {
fmt.Println("Waiting for table to be created ...")
time.Sleep(time.Second * 10)
continue
}
}
fmt.Printf("** ERR *** unable to configure ttl for table - %v\n", err)
os.Exit(1)
}
break
}
fmt.Println("Successfully configured TTL")
}
}