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144 lines
5.6 KiB
Markdown
144 lines
5.6 KiB
Markdown
---
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id: dynamodb
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title: DynamoDB
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---
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[](https://gofiber.io/discord)
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A DynamoDB storage driver using [aws/aws-sdk-go-v2](https://github.com/aws/aws-sdk-go-v2).
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**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](https://aws.github.io/aws-sdk-go-v2/docs/configuring-sdk/#specifying-credentials)
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### Table of Contents
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- [Signatures](#signatures)
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- [Installation](#installation)
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- [Examples](#examples)
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- [Config](#config)
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- [Default Config](#default-config)
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### Signatures
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```go
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func New(config Config) Storage
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func (s *Storage) Get(key string) ([]byte, error)
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func (s *Storage) GetWithContext(ctx context.Context, key string) ([]byte, error)
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func (s *Storage) Set(key string, val []byte, exp time.Duration) error
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func (s *Storage) SetWithContext(ctx context.Context, key string, val []byte, exp time.Duration) error
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func (s *Storage) Delete(key string) error
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func (s *Storage) DeleteWithContext(ctx context.Context, key string) error
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func (s *Storage) Reset() error
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func (s *Storage) ResetWithContext(ctx context.Context) error
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func (s *Storage) Close() error
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func (s *Storage) Conn() *awsdynamodb.Client
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```
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### Installation
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DynamoDB is tested on the 2 last [Go versions](https://golang.org/dl/) with support for modules. So make sure to initialize one first if you didn't do that yet:
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```bash
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go mod init github.com/<user>/<repo>
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```
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And then install the dynamodb implementation:
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```bash
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go get github.com/gofiber/storage/dynamodb/v2
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```
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### Examples
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Import the storage package.
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```go
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import "github.com/gofiber/storage/dynamodb/v2"
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```
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You can use the following possibilities to create a storage:
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```go
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// Initialize dynamodb
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store := dynamodb.New(dynamodb.Config{
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})
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```
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### Config
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```go
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type Config struct {
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// Region of the DynamoDB service you want to use.
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// Valid values: https://docs.aws.amazon.com/general/latest/gr/rande.html#ddb_region.
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// E.g. "us-west-2".
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// Optional (read from shared config file or environment variable if not set).
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// Environment variable: "AWS_REGION".
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Region string
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// Name of the DynamoDB table.
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// Optional ("fiber_storage" by default).
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Table string
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// CustomEndpoint allows you to set a custom DynamoDB service endpoint.
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// This is especially useful if you're running a "DynamoDB local" Docker container for local testing.
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// Typical value for the Docker container: "http://localhost:8000".
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// See https://hub.docker.com/r/amazon/dynamodb-local/.
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// Optional ("" by default)
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Endpoint string
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// Credentials overrides AWS access key and AWS secret access key. Not recommended.
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//
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// Optional. Default is Credentials{}
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Credentials Credentials
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// The maximum number of times requests that encounter retryable failures should be attempted.
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//
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// Optional. Default is 3
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MaxAttempts int
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// Reset clears any existing keys in existing Bucket
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//
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// Optional. Default is false
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Reset bool
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// ReadCapacityUnits of the table.
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// Only required when the table doesn't exist yet and is created by gokv.
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// Optional (5 by default, which is the same default value as when creating a table in the web console)
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// 25 RCUs are included in the free tier (across all tables).
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// For example calculations, see https://github.com/awsdocs/amazon-dynamodb-developer-guide/blob/c420420a59040c5b3dd44a6e59f7c9e55fc922ef/doc_source/HowItWorks.ProvisionedThroughput.
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// 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.
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ReadCapacityUnits int64
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// ReadCapacityUnits of the table.
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// Only required when the table doesn't exist yet and is created by gokv.
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// Optional (5 by default, which is the same default value as when creating a table in the web console)
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// 25 RCUs are included in the free tier (across all tables).
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// For example calculations, see https://github.com/awsdocs/amazon-dynamodb-developer-guide/blob/c420420a59040c5b3dd44a6e59f7c9e55fc922ef/doc_source/HowItWorks.ProvisionedThroughput.
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// 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.
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WriteCapacityUnits int64
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// If the table doesn't exist yet, gokv creates it.
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// If WaitForTableCreation is true, gokv will block until the table is created, with a timeout of 15 seconds.
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// If the table still doesn't exist after 15 seconds, an error is returned.
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// If WaitForTableCreation is false, gokv returns the client immediately.
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// In the latter case you need to make sure that you don't read from or write to the table before it's created,
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// because otherwise you will get ResourceNotFoundException errors.
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// Optional (true by default).
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WaitForTableCreation *bool
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}
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type Credentials struct {
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AccessKey string
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SecretAccessKey string
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}
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```
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### Default Config
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```go
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var ConfigDefault = Config{
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Table: "fiber_storage",
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Credentials: Credentials{},
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MaxAttempts: 3,
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Reset: false,
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ReadCapacityUnits: 5,
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WriteCapacityUnits: 5,
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WaitForTableCreation: aws.Bool(true),
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}
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```
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