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backup_source_provider.go
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/
backup_source_provider.go
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package provider
import (
"context"
"fmt"
"github.com/ottogroup/penelope/pkg/config"
"github.com/ottogroup/penelope/pkg/service/gcs"
"go.opencensus.io/trace"
"gopkg.in/yaml.v3"
"time"
)
type AvailabilityClass string
const (
A0Invalid AvailabilityClass = ""
A1Irrelevant AvailabilityClass = "A1"
A2Aimed AvailabilityClass = "A2"
A3Guaranteed AvailabilityClass = "A3"
A4Resilient AvailabilityClass = "A4"
)
func (AvailabilityClass) ValidValues() []AvailabilityClass {
return []AvailabilityClass{A1Irrelevant, A2Aimed, A3Guaranteed, A4Resilient}
}
type SourceGCPProject struct {
AvailabilityClass AvailabilityClass `json:"availability_class"`
DataOwner string `json:"data_owner"`
}
type SourceGCPProjectProvider interface {
GetSourceGCPProject(ctxIn context.Context, gcpProjectID string) (SourceGCPProject, error)
}
type defaultSourceGCPProjectProvider struct {
client gcs.CloudStorageClient
lastFetch time.Time
refreshDuration time.Duration
cache []gcpSourceProject
}
type gcpSourceProject struct {
Project string `yaml:"project"`
AvailabilityClass AvailabilityClass `yaml:"availability_class"`
DataOwner string `yaml:"data_owner"`
}
func (d *defaultSourceGCPProjectProvider) GetSourceGCPProject(ctxIn context.Context, gcpProjectID string) (SourceGCPProject, error) {
ctx, span := trace.StartSpan(ctxIn, "GetSourceGCPProject")
defer span.End()
if len(d.cache) == 0 || time.Since(d.lastFetch) > d.refreshDuration {
bucketName := config.DefaultProviderBucketEnv.MustGet()
objectName := config.DefaultProviderGCPSourceProjectPathEnv.MustGet()
object, err := d.client.ReadObject(ctx, bucketName, objectName)
if err != nil {
return SourceGCPProject{}, err
}
if err = yaml.Unmarshal(object, &d.cache); err != nil {
return SourceGCPProject{}, fmt.Errorf("can not parse yaml file %s", err)
}
d.lastFetch = time.Now()
}
for _, entry := range d.cache {
if entry.Project == gcpProjectID {
return SourceGCPProject{
AvailabilityClass: entry.AvailabilityClass,
DataOwner: entry.DataOwner,
}, nil
}
}
return SourceGCPProject{}, fmt.Errorf("could not find GCP source project for %s in backupProjectsPath %s", gcpProjectID, config.DefaultProviderGCPSourceProjectPathEnv.MustGet())
}
func NewDefaultSourceGCPBackupProvider(ctxIn context.Context, gcsClient gcs.CloudStorageClient) (SourceGCPProjectProvider, error) {
ctx, span := trace.StartSpan(ctxIn, "NewDefaultSourceGCPBackupProvider")
defer span.End()
if gcsClient == nil || !gcsClient.IsInitialized(ctx) {
return &defaultSourceGCPProjectProvider{}, fmt.Errorf("can not create instance of defaultGCSBackupProvider with unititialized GcsClient")
}
ttl, err := defaultProviderCacheTTL()
if err != nil {
return &defaultSourceGCPProjectProvider{}, fmt.Errorf("can not create instance of defaultGCSBackupProvider %s", err)
}
return &defaultSourceGCPProjectProvider{gcsClient, time.Now().Add(ttl * -2), ttl, []gcpSourceProject{}}, nil
}