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device_driver.go
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device_driver.go
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package driver
import (
"context"
"fmt"
"github.com/pkg/errors"
"github.com/thingio/edge-device-std/config"
"github.com/thingio/edge-device-std/logger"
"github.com/thingio/edge-device-std/models"
bus "github.com/thingio/edge-device-std/msgbus"
"github.com/thingio/edge-device-std/operations"
"sync"
)
func NewDeviceDriver(ctx context.Context, cancel context.CancelFunc,
protocol *models.Protocol, twinBuilder models.DeviceTwinBuilder) (*DeviceDriver, error) {
if protocol == nil {
return nil, fmt.Errorf("the product cannot be nil")
}
if twinBuilder == nil {
return nil, fmt.Errorf("please implement and specify the connector builder")
}
dd := &DeviceDriver{
protocol: protocol,
twinBuilder: twinBuilder,
products: sync.Map{},
devices: sync.Map{},
runners: sync.Map{},
ctx: ctx,
cancel: cancel,
}
return dd, nil
}
type DeviceDriver struct {
// driver
protocol *models.Protocol
twinBuilder models.DeviceTwinBuilder
// caches
products sync.Map
devices sync.Map
runners sync.Map
// operation clients
propsBus chan *models.DeviceDataWrapper
eventBus chan *models.DeviceDataWrapper
dc operations.DriverClient
ds operations.DriverService
// lifetime control variables for the device driver
ctx context.Context
cancel context.CancelFunc
logger *logger.Logger
cfg *config.Configuration
}
func (d *DeviceDriver) Initialize() error {
if cfg, err := config.NewConfiguration(); err != nil {
return err
} else {
d.cfg = cfg
}
if lg, err := logger.NewLogger(&d.cfg.LogOptions); err != nil {
return err
} else {
d.logger = lg
}
if err := d.initializeOperations(); err != nil {
return err
}
return nil
}
func (d *DeviceDriver) initializeOperations() error {
d.propsBus = make(chan *models.DeviceDataWrapper, 1000)
d.eventBus = make(chan *models.DeviceDataWrapper, 1000)
mb, err := bus.NewMessageBus(&d.cfg.MessageBus, d.logger)
if err != nil {
return errors.Wrap(err, "fail to initialize the message bus")
}
dc, err := operations.NewDriverClient(mb, d.logger)
if err != nil {
return errors.Wrap(err, "fail to new an operations client")
}
d.dc = dc
ds, err := operations.NewDriverService(mb, d.logger)
if err != nil {
return errors.Wrap(err, "fail to new an operations service")
}
d.ds = ds
return nil
}
func (d *DeviceDriver) Serve() error {
if err := d.subscribeMetaMutation(); err != nil {
panic(err)
}
d.activateDevices()
defer d.deactivateDevices()
if err := d.handleDataOperation(); err != nil {
panic(err)
}
go d.reportingDriverHealth()
go d.reportingDevicesHealth()
go d.reportingDevicesData()
<-d.ctx.Done()
return nil
}
func (d *DeviceDriver) putProduct(product *models.Product) {
d.products.Store(product.ID, product)
}
func (d *DeviceDriver) getProduct(productID string) (*models.Product, error) {
v, ok := d.products.Load(productID)
if ok {
return v.(*models.Product), nil
}
return nil, fmt.Errorf("the product[%s] is not found in cache", productID)
}
func (d *DeviceDriver) deleteProduct(productID string) {
d.products.Delete(productID)
}
func (d *DeviceDriver) getDevice(deviceID string) (*models.Device, error) {
v, ok := d.devices.Load(deviceID)
if ok {
return v.(*models.Device), nil
}
return nil, fmt.Errorf("the device[%s] is not found in cache", deviceID)
}
func (d *DeviceDriver) getRunner(deviceID string) (TwinRunner, error) {
v, ok := d.runners.Load(deviceID)
if ok {
return v.(TwinRunner), nil
}
return nil, fmt.Errorf("the device[%s] is not activated", deviceID)
}
func (d *DeviceDriver) putDeviceAndRunner(deviceID string, device *models.Device, runner TwinRunner) {
d.runners.Store(deviceID, runner)
d.devices.Store(device.ID, device)
}
func (d *DeviceDriver) deleteDeviceAndRunner(deviceID string) {
d.devices.Delete(deviceID)
d.runners.Delete(deviceID)
}