awsparamstore

package
Version: v0.24.0 Latest Latest
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Published: Sep 1, 2021 License: Apache-2.0 Imports: 22 Imported by: 2

Documentation

Overview

Package awsparamstore provides a runtimevar implementation with variables read from AWS Systems Manager Parameter Store (https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-paramstore.html) Use OpenVariable to construct a *runtimevar.Variable.

URLs

For runtimevar.OpenVariable, awsparamstore registers for the scheme "awsparamstore". The default URL opener will use an AWS session with the default credentials and configuration; see https://docs.aws.amazon.com/sdk-for-go/api/aws/session/ for more details. To customize the URL opener, or for more details on the URL format, see URLOpener. See https://gocloud.dev/concepts/urls/ for background information.

As

awsparamstore exposes the following types for As:

- Snapshot: (V1) *ssm.GetParameterOutput, *ssm.DescribeParametersOutput, (V2) *ssmv2.GetParameterOutput, *ssmv2.DescribeParametersOutput
- Error: (V1) awserr.Error, (V2) any error type returned by the service, notably smithy.APIError
Example (OpenVariableFromURL)
package main

import (
	"context"
	"log"

	"gocloud.dev/runtimevar"
)

func main() {
	// PRAGMA: This example is used on gocloud.dev; PRAGMA comments adjust how it is shown and can be ignored.
	// PRAGMA: On gocloud.dev, add a blank import: _ "gocloud.dev/runtimevar/awsparamstore"
	// PRAGMA: On gocloud.dev, hide lines until the next blank line.
	ctx := context.Background()

	// runtimevar.OpenVariable creates a *runtimevar.Variable from a URL.
	v, err := runtimevar.OpenVariable(ctx, "awsparamstore://myvar?region=us-west-1&decoder=string")
	if err != nil {
		log.Fatal(err)
	}
	defer v.Close()

	// Use "awssdk=v1" or "v2" to force a specific AWS SDK version.
	vUsingV2, err := runtimevar.OpenVariable(ctx, "awsparamstore://myvar?region=us-west-1&decoder=string&awssdk=v2")
	if err != nil {
		log.Fatal(err)
	}
	defer vUsingV2.Close()
}
Output:

Index

Examples

Constants

View Source
const Scheme = "awsparamstore"

Scheme is the URL scheme awsparamstore registers its URLOpener under on runtimevar.DefaultMux.

Variables

View Source
var Set = wire.NewSet(
	wire.Struct(new(URLOpener), "ConfigProvider"),
)

Set holds Wire providers for this package.

Functions

func OpenVariable added in v0.13.0

func OpenVariable(sess client.ConfigProvider, name string, decoder *runtimevar.Decoder, opts *Options) (*runtimevar.Variable, error)

OpenVariable constructs a *runtimevar.Variable backed by the variable name in AWS Systems Manager Parameter Store. Parameter Store returns raw bytes; provide a decoder to decode the raw bytes into the appropriate type for runtimevar.Snapshot.Value. See the runtimevar package documentation for examples of decoders.

Example
package main

import (
	"log"

	"github.com/aws/aws-sdk-go/aws/session"
	"gocloud.dev/runtimevar"
	"gocloud.dev/runtimevar/awsparamstore"
)

func main() {
	// PRAGMA: This example is used on gocloud.dev; PRAGMA comments adjust how it is shown and can be ignored.

	// Establish an AWS session.
	// See https://docs.aws.amazon.com/sdk-for-go/api/aws/session/ for more info.
	sess, err := session.NewSession(nil)
	if err != nil {
		log.Fatal(err)
	}

	// Construct a *runtimevar.Variable that watches the variable.
	v, err := awsparamstore.OpenVariable(sess, "cfg-variable-name", runtimevar.StringDecoder, nil)
	if err != nil {
		log.Fatal(err)
	}
	defer v.Close()
}
Output:

func OpenVariableV2 added in v0.24.0

func OpenVariableV2(client *ssmv2.Client, name string, decoder *runtimevar.Decoder, opts *Options) (*runtimevar.Variable, error)

OpenVariableV2 constructs a *runtimevar.Variable backed by the variable name in AWS Systems Manager Parameter Store, using AWS SDK V2. Parameter Store returns raw bytes; provide a decoder to decode the raw bytes into the appropriate type for runtimevar.Snapshot.Value. See the runtimevar package documentation for examples of decoders.

Example
package main

import (
	"context"
	"log"

	awsv2cfg "github.com/aws/aws-sdk-go-v2/config"
	ssmv2 "github.com/aws/aws-sdk-go-v2/service/ssm"
	"gocloud.dev/runtimevar"
	"gocloud.dev/runtimevar/awsparamstore"
)

func main() {
	// PRAGMA: This example is used on gocloud.dev; PRAGMA comments adjust how it is shown and can be ignored.

	// Establish a AWS V2 Config.
	// See https://aws.github.io/aws-sdk-go-v2/docs/configuring-sdk/ for more info.
	ctx := context.Background()
	cfg, err := awsv2cfg.LoadDefaultConfig(ctx)
	if err != nil {
		log.Fatal(err)
	}

	// Construct a *runtimevar.Variable that watches the variable.
	clientV2 := ssmv2.NewFromConfig(cfg)
	v, err := awsparamstore.OpenVariableV2(clientV2, "cfg-variable-name", runtimevar.StringDecoder, nil)
	if err != nil {
		log.Fatal(err)
	}
	defer v.Close()
}
Output:

Types

type Options

type Options struct {
	// WaitDuration controls the rate at which Parameter Store is polled.
	// Defaults to 30 seconds.
	WaitDuration time.Duration
}

Options sets options.

type URLOpener

type URLOpener struct {
	// UseV2 indicates whether the AWS SDK V2 should be used.
	UseV2 bool

	// ConfigProvider must be set to a non-nil value if UseV2 is false.
	ConfigProvider client.ConfigProvider

	// Decoder specifies the decoder to use if one is not specified in the URL.
	// Defaults to runtimevar.BytesDecoder.
	Decoder *runtimevar.Decoder

	// Options specifies the options to pass to New.
	Options Options
}

URLOpener opens AWS Paramstore URLs like "awsparamstore://myvar".

Use "awssdk=v1" to force using AWS SDK v1, "awssdk=v2" to force using AWS SDK v2, or anything else to accept the default.

For V1, see gocloud.dev/aws/ConfigFromURLParams for supported query parameters for overriding the aws.Session from the URL. For V2, see gocloud.dev/aws/V2ConfigFromURLParams.

In addition, the following URL parameters are supported:

- decoder: The decoder to use. Defaults to URLOpener.Decoder, or
    runtimevar.BytesDecoder if URLOpener.Decoder is nil.
    See runtimevar.DecoderByName for supported values.

func (*URLOpener) OpenVariableURL

func (o *URLOpener) OpenVariableURL(ctx context.Context, u *url.URL) (*runtimevar.Variable, error)

OpenVariableURL opens the variable at the URL's path. See the package doc for more details.

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