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resource_instance.go
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resource_instance.go
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package resource
import (
"crypto/sha256"
"encoding/json"
"fmt"
"code.cloudfoundry.org/lager"
"github.com/concourse/atc"
"github.com/concourse/atc/creds"
"github.com/concourse/atc/db"
"github.com/concourse/atc/worker"
)
//go:generate counterfeiter . ResourceInstance
type ResourceInstance interface {
// XXX: do we need these?
Source() atc.Source
Params() atc.Params
Version() atc.Version
ResourceType() ResourceType
ResourceCache() *db.UsedResourceCache
ContainerOwner() db.ContainerOwner
LockName(string) (string, error)
FindOn(lager.Logger, worker.Worker) (worker.Volume, bool, error)
}
type resourceInstance struct {
resourceTypeName ResourceType
version atc.Version
source atc.Source
params atc.Params
resourceTypes creds.VersionedResourceTypes
resourceCache *db.UsedResourceCache
containerOwner db.ContainerOwner
}
func NewResourceInstance(
resourceTypeName ResourceType,
version atc.Version,
source atc.Source,
params atc.Params,
resourceTypes creds.VersionedResourceTypes,
resourceCache *db.UsedResourceCache,
containerOwner db.ContainerOwner,
) ResourceInstance {
return &resourceInstance{
resourceTypeName: resourceTypeName,
version: version,
source: source,
params: params,
resourceTypes: resourceTypes,
resourceCache: resourceCache,
containerOwner: containerOwner,
}
}
func (instance resourceInstance) ContainerOwner() db.ContainerOwner {
return instance.containerOwner
}
func (instance resourceInstance) ResourceCache() *db.UsedResourceCache {
return instance.resourceCache
}
func (instance resourceInstance) Source() atc.Source {
return instance.source
}
func (instance resourceInstance) Params() atc.Params {
return instance.params
}
func (instance resourceInstance) Version() atc.Version {
return instance.version
}
func (instance resourceInstance) ResourceType() ResourceType {
return instance.resourceTypeName
}
// XXX: this is weird
func (instance resourceInstance) LockName(workerName string) (string, error) {
id := &resourceInstanceLockID{
Type: instance.resourceTypeName,
Version: instance.version,
Source: instance.source,
Params: instance.params,
WorkerName: workerName,
}
taskNameJSON, err := json.Marshal(id)
if err != nil {
return "", err
}
return fmt.Sprintf("%x", sha256.Sum256(taskNameJSON)), nil
}
func (instance resourceInstance) FindOn(logger lager.Logger, workerClient worker.Worker) (worker.Volume, bool, error) {
return workerClient.FindVolumeForResourceCache(
logger,
instance.resourceCache,
)
}
type resourceInstanceLockID struct {
Type ResourceType `json:"type,omitempty"`
Version atc.Version `json:"version,omitempty"`
Source atc.Source `json:"source,omitempty"`
Params atc.Params `json:"params,omitempty"`
WorkerName string `json:"worker_name,omitempty"`
}