84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
package sloppy
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import (
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"slices"
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"sync"
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"time"
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"github.com/fiskerinc/cloud-services/pkg/logger"
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"github.com/fiskerinc/cloud-services/pkg/utils/whereami"
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)
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var vinblocker *VINBlocker
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var vinblockerOnce sync.Once
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// VIN Blocker fetches the list of allowed vins once per day, and stores them locally to check against
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func GetVINBlocker() *VINBlocker {
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vinblockerOnce.Do(func() {
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vinblocker = newVINBlocker()
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})
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return vinblocker
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}
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type VINBlocker struct {
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allowedList []string // The list of vins to allow
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allowAll bool // Should we allow all vins to be used
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sync.RWMutex // Control overwriting the allowed list
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}
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func newVINBlocker() (vb *VINBlocker) {
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vb = &VINBlocker{}
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vb.allowAll = true // This will for half a second allow all cars to access cloud
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// create a new thread to get the list of vins everyday
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//On dev, always allow all connections
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if whereami.Environment != whereami.DEVELOPMENT {
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vb.updateVINList() // Run in thread, so no sneaks can happen
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go vb.autoUpdate()
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}
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return vb
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}
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func (vb *VINBlocker) IsVINAllowed(vin string) (allow bool) {
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// We are allowing all vins to connect
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if vb.allowAll {
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return true
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}
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vb.RLock()
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defer vb.RUnlock()
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// Returns the index of where the string might be, annoying
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_, allow = slices.BinarySearch(vb.allowedList, vin)
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return allow
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}
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func (vb *VINBlocker) autoUpdate() {
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vb.updateVINList()
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// Going to be pretty actively changed, so should change this to more detect when vin list is diff
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nextRun := time.Now().Add(1 * time.Hour)
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time.AfterFunc(time.Until(nextRun), vb.autoUpdate)
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}
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func (vb *VINBlocker) updateVINList() {
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tempList := fetchVINList()
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vb.Lock()
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defer vb.Unlock()
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if len(tempList) == 0 {
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vb.allowAll = true
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} else {
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vb.allowAll = false
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}
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vb.allowedList = tempList
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}
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func fetchVINList() (vinList []string) {
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carsDB := GetCarsDB()
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var err error
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vinList, err = carsDB.GetWhiteListCars()
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if err != nil {
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logger.Err(err).Msg("Failed to vinBlocker list")
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}
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// making sure the results are sorted
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slices.Sort(vinList)
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return
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}
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