dynamodb

id: dynamodb title: DynamoDB

A DynamoDB storage driver using aws/aws-sdk-go-v2.

Note: If config fields of credentials not given, credentials are using from the environment variables, ~/.aws/credentials, or EC2 instance role. If config fields of credentials given, credentials are using from config. Look at: specifying credentials

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Table of Contents

• Signatures
• Installation
• Examples
• Config
• Default Config

Signatures

func New(config Config) Storage


func (s *Storage) Get(key string) ([]byte, error)
func (s *Storage) Set(key string, val []byte, exp time.Duration) error
func (s *Storage) Delete(key string) error
func (s *Storage) Reset() error
func (s *Storage) Close() error
func (s *Storage) Conn() *awsdynamodb.Client

Installation

DynamoDB is tested on the 2 last Go versions with support for modules. So make sure to initialize one first if you didn't do that yet:

go mod init github.com/<user>/<repo>

And then install the dynamodb implementation:

go get github.com/gofiber/storage/dynamodb

Examples

Import the storage package.

import "github.com/gofiber/storage/dynamodb"

You can use the following possibilities to create a storage:

// Initialize dynamodb
store := dynamodb.New(dynamodb.Config{
	
})

Config

type Config struct {
	// Region of the DynamoDB service you want to use.
	// Valid values: https://docs.aws.amazon.com/general/latest/gr/rande.html#ddb_region.
	// E.g. "us-west-2".
	// Optional (read from shared config file or environment variable if not set).
	// Environment variable: "AWS_REGION".
	Region string

	// Name of the DynamoDB table.
	// Optional ("fiber_storage" by default).
	Table string

	// CustomEndpoint allows you to set a custom DynamoDB service endpoint.
	// This is especially useful if you're running a "DynamoDB local" Docker container for local testing.
	// Typical value for the Docker container: "http://localhost:8000".
	// See https://hub.docker.com/r/amazon/dynamodb-local/.
	// Optional ("" by default)
	Endpoint string

	// Credentials overrides AWS access key and AWS secret access key. Not recommended.
	//
	// Optional. Default is Credentials{}
	Credentials Credentials

	// The maximum number of times requests that encounter retryable failures should be attempted.
	//
	// Optional. Default is 3
	MaxAttempts int

	// Reset clears any existing keys in existing Bucket
	//
	// Optional. Default is false
	Reset bool

	// ReadCapacityUnits of the table.
	// Only required when the table doesn't exist yet and is created by gokv.
	// Optional (5 by default, which is the same default value as when creating a table in the web console)
	// 25 RCUs are included in the free tier (across all tables).
	// For example calculations, see https://github.com/awsdocs/amazon-dynamodb-developer-guide/blob/c420420a59040c5b3dd44a6e59f7c9e55fc922ef/doc_source/HowItWorks.ProvisionedThroughput.
	// For limits, see https://github.com/awsdocs/amazon-dynamodb-developer-guide/blob/c420420a59040c5b3dd44a6e59f7c9e55fc922ef/doc_source/Limits.md#capacity-units-and-provisioned-throughput.md#provisioned-throughput.
	ReadCapacityUnits int64

	// ReadCapacityUnits of the table.
	// Only required when the table doesn't exist yet and is created by gokv.
	// Optional (5 by default, which is the same default value as when creating a table in the web console)
	// 25 RCUs are included in the free tier (across all tables).
	// For example calculations, see https://github.com/awsdocs/amazon-dynamodb-developer-guide/blob/c420420a59040c5b3dd44a6e59f7c9e55fc922ef/doc_source/HowItWorks.ProvisionedThroughput.
	// For limits, see https://github.com/awsdocs/amazon-dynamodb-developer-guide/blob/c420420a59040c5b3dd44a6e59f7c9e55fc922ef/doc_source/Limits.md#capacity-units-and-provisioned-throughput.md#provisioned-throughput.
	WriteCapacityUnits int64

	// If the table doesn't exist yet, gokv creates it.
	// If WaitForTableCreation is true, gokv will block until the table is created, with a timeout of 15 seconds.
	// If the table still doesn't exist after 15 seconds, an error is returned.
	// If WaitForTableCreation is false, gokv returns the client immediately.
	// In the latter case you need to make sure that you don't read from or write to the table before it's created,
	// because otherwise you will get ResourceNotFoundException errors.
	// Optional (true by default).
	WaitForTableCreation *bool
}

type Credentials struct {
	AccessKey       string
	SecretAccessKey string
}

Default Config

var ConfigDefault = Config{
	Table:                "fiber_storage",
	Credentials:          Credentials{},
	MaxAttempts:          3,
	Reset:                false,
	ReadCapacityUnits:    5,
	WriteCapacityUnits:   5,
	WaitForTableCreation: aws.Bool(true),
}