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picker.go
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picker.go
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package proverbial
import (
"context"
"fmt"
"math/rand"
"os"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute"
)
type ddbScanner interface {
ScanWithContext(ctx aws.Context, input *dynamodb.ScanInput, opts ...request.Option) (*dynamodb.ScanOutput, error)
}
// Picker picks an item from the checks database.
type Picker struct {
ddbClient ddbScanner
}
// NewPicker returns a new Picker.
func NewPicker(ddb ddbScanner) *Picker {
return &Picker{ddbClient: ddb}
}
// Handle handles the request.
func (p *Picker) Handle(ctx context.Context) (string, error) {
checks, err := p.getAllItems(ctx)
if err != nil {
return "", err
}
// seed our random picking and pick
s := rand.NewSource(time.Now().Unix())
r := rand.New(s)
// pick
return checks[r.Intn(len(checks))].Name, nil
}
func (p *Picker) getAllItems(ctx context.Context) ([]check, error) {
input := &dynamodb.ScanInput{
TableName: aws.String(os.Getenv("TABLE_NAME")),
}
result, err := p.ddbClient.ScanWithContext(ctx, input)
if err != nil {
return nil, fmt.Errorf("failed to scan table: %s", err)
}
var checks []check
err = dynamodbattribute.UnmarshalListOfMaps(result.Items, &checks)
if err != nil {
return nil, fmt.Errorf("failed to unmarshal results: %s", err)
}
return checks, nil
}