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assets.go
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/
assets.go
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package definition
import (
"strings"
"sync"
"github.com/nyaruka/goflow/assets"
"github.com/nyaruka/goflow/flows"
"github.com/nyaruka/goflow/flows/definition/migrations"
)
// implemention of FlowAssets which provides lazy loading and validation of flows
type flowAssets struct {
cache map[assets.FlowUUID]flows.Flow
mutex sync.Mutex
source assets.Source
migrationConfig *migrations.Config
}
// NewFlowAssets creates a new flow assets
func NewFlowAssets(source assets.Source, migrationConfig *migrations.Config) flows.FlowAssets {
return &flowAssets{
cache: make(map[assets.FlowUUID]flows.Flow),
source: source,
migrationConfig: migrationConfig,
}
}
// Get returns the flow with the given UUID
func (a *flowAssets) Get(uuid assets.FlowUUID) (flows.Flow, error) {
a.mutex.Lock()
defer a.mutex.Unlock()
flow := a.cache[uuid]
if flow != nil {
return flow, nil
}
asset, err := a.source.FlowByUUID(uuid)
if err != nil {
return nil, err
}
flow, err = ReadAsset(asset, a.migrationConfig)
if err != nil {
return nil, err
}
a.cache[flow.UUID()] = flow
return flow, nil
}
// FindByName tries to find a flow with the given name
func (a *flowAssets) FindByName(name string) (flows.Flow, error) {
a.mutex.Lock()
defer a.mutex.Unlock()
for _, flow := range a.cache {
if strings.EqualFold(flow.Name(), name) {
return flow, nil
}
}
asset, err := a.source.FlowByName(name)
if err != nil {
return nil, err
}
flow, err := ReadAsset(asset, a.migrationConfig)
if err != nil {
return nil, err
}
a.cache[flow.UUID()] = flow
return flow, nil
}