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sys_loader.go
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sys_loader.go
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package file_loader
import (
"fmt"
"io"
"net/http"
"os"
fileLoadRequest "github.com/gravestench/director/pkg/components/file_load_request"
fileLoadResponse "github.com/gravestench/director/pkg/components/file_load_response"
fileType "github.com/gravestench/director/pkg/components/file_type"
"github.com/gravestench/akara"
"github.com/gravestench/director/pkg/systems/file_loader/loader"
"github.com/gravestench/director/pkg/systems/file_loader/loader/file_system"
"github.com/gravestench/director/pkg/systems/file_loader/loader/web"
)
const allowedFailedLoadAttempts = 10
var _ akara.System = &System{}
type System struct {
akara.BaseSystem
loader.Loader
components struct {
request fileLoadRequest.ComponentFactory
response fileLoadResponse.ComponentFactory
fileType fileType.ComponentFactory
}
subscribed struct {
awaitingResponse *akara.Subscription
needsFileType *akara.Subscription
}
}
func (sys *System) Name() string {
return "FileLoader"
}
func (sys *System) Init(world *akara.World) {
sys.World = world
sys.initComponents()
sys.initSubscriptions()
sys.initProviders()
}
func (sys *System) initComponents() {
sys.InjectComponent(&fileLoadRequest.Component{}, &sys.components.request.ComponentFactory)
sys.InjectComponent(&fileLoadResponse.Component{}, &sys.components.response.ComponentFactory)
sys.InjectComponent(&fileType.Component{}, &sys.components.fileType.ComponentFactory)
}
func (sys *System) initProviders() {
cwd, err := os.Getwd()
if err == nil {
fsProvider := file_system.New(cwd)
sys.AddProvider(fsProvider)
}
sys.AddProvider(web.New())
}
func (sys *System) initSubscriptions() {
sys.initLoadRequestSubscription()
sys.initTypeResolutionSubscription()
}
func (sys *System) initLoadRequestSubscription() {
filter := sys.World.NewComponentFilter()
filter.
Require(&fileLoadRequest.Component{}).
Forbid(&fileLoadResponse.Component{})
sys.subscribed.awaitingResponse = sys.AddSubscription(filter.Build())
}
func (sys *System) initTypeResolutionSubscription() {
filter := sys.World.NewComponentFilter()
filter.
Require(&fileLoadResponse.Component{}).
Forbid(&fileType.Component{})
sys.subscribed.needsFileType = sys.AddSubscription(filter.Build())
}
func (sys *System) IsInitialized() bool {
if sys.components.request.ComponentFactory == nil {
return false
}
if sys.subscribed.awaitingResponse == nil {
return false
}
return true
}
func (sys *System) Update() {
for _, eid := range sys.subscribed.awaitingResponse.GetEntities() {
sys.processLoadRequest(eid)
}
for _, eid := range sys.subscribed.needsFileType.GetEntities() {
sys.determineFileType(eid)
}
}
func (sys *System) processLoadRequest(e akara.EID) {
req, found := sys.components.request.Get(e)
if !found {
return
}
req.Attempts++
stream, streamErr := sys.Load(req.Path)
if streamErr != nil {
if req.Attempts >= allowedFailedLoadAttempts {
fmt.Printf("Could not find %s after %v attempts\n", req.Path, req.Attempts)
sys.RemoveEntity(e)
}
return
}
res := sys.components.response.Add(e)
res.Stream = stream
}
func (sys *System) determineFileType(e akara.EID) {
res, found := sys.components.response.Get(e)
if !found {
return
}
if res.Stream == nil {
return
}
data, err := io.ReadAll(res.Stream)
if err != nil {
return
}
ft := sys.components.fileType.Add(e)
ft.Type = http.DetectContentType(data)
}