/
service.go
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/
service.go
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package implementation
import (
// stdlib
"context"
"strings"
// external
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/kevinburke/go.uuid"
// project
"github.com/basvanbeek/opencensus-gokit-example/services/device"
"github.com/basvanbeek/opencensus-gokit-example/services/event"
"github.com/basvanbeek/opencensus-gokit-example/services/frontend"
"github.com/basvanbeek/opencensus-gokit-example/services/qr"
)
// service implements frontend.Service
type service struct {
evtClient event.Service
devClient device.Service
qrClient qr.Service
logger log.Logger
}
// NewService creates and returns a new Frontend service instance
func NewService(evtClient event.Service, devClient device.Service, qrClient qr.Service, logger log.Logger) frontend.Service {
return &service{
evtClient: evtClient,
devClient: devClient,
qrClient: qrClient,
logger: logger,
}
}
func (s *service) Login(ctx context.Context, user, pass string) (*frontend.Login, error) {
// NOTE: obviously this is hardcoded due to demo purposes
user = strings.Trim(user, "\r\n\t ")
pass = strings.Trim(pass, "\r\n\t ")
if len(user) == 0 || len(pass) == 0 {
return nil, frontend.ErrUserPassRequired
}
switch {
case user == "john" && pass == "doe":
return &frontend.Login{
ID: uuid.NewV5(uuid.NamespaceOID, "user.id.1"),
Name: "John Doe",
TenantID: uuid.NewV5(uuid.NamespaceOID, "tenant.id.1"),
TenantName: "Acme Corp.",
}, nil
case user == "jane" && pass == "doe":
return &frontend.Login{
ID: uuid.NewV5(uuid.NamespaceOID, "user.id.2"),
Name: "Jane Doe",
TenantID: uuid.NewV5(uuid.NamespaceOID, "tenant.id.2"),
TenantName: "Evil Inc.",
}, nil
}
return nil, frontend.ErrUserPassUnknown
}
func (s *service) EventCreate(ctx context.Context, tenantID uuid.UUID, evt frontend.Event) (*uuid.UUID, error) {
id, err := s.evtClient.Create(ctx, tenantID, event.Event(evt))
switch err {
case nil:
return id, nil
case event.ErrEventExists:
return nil, frontend.ErrEventExists
default:
return nil, frontend.ErrService
}
}
func (s *service) EventGet(ctx context.Context, tenantID, id uuid.UUID) (*frontend.Event, error) {
evt, err := s.evtClient.Get(ctx, tenantID, id)
switch err {
case nil:
return (*frontend.Event)(evt), nil
case event.ErrNotFound:
return nil, frontend.ErrEventNotFound
default:
return nil, frontend.ErrService
}
}
func (s *service) EventUpdate(ctx context.Context, tenantID uuid.UUID, evt frontend.Event) error {
err := s.evtClient.Update(ctx, tenantID, event.Event(evt))
switch err {
case nil:
return nil
case event.ErrEventExists:
return frontend.ErrEventExists
case event.ErrNotFound:
return frontend.ErrEventNotFound
default:
return frontend.ErrService
}
}
func (s *service) EventDelete(ctx context.Context, tenantID, id uuid.UUID) error {
if err := s.evtClient.Delete(ctx, tenantID, id); err != nil {
return frontend.ErrService
}
return nil
}
func (s *service) EventList(ctx context.Context, tenantID uuid.UUID) ([]*frontend.Event, error) {
evts, err := s.evtClient.List(ctx, tenantID)
if err != nil {
return nil, frontend.ErrService
}
events := make([]*frontend.Event, 0, len(evts))
for _, e := range evts {
events = append(events, (*frontend.Event)(e))
}
return events, nil
}
// Unlockdevice returns a new session for allowing device to check-in participants.
func (s *service) UnlockDevice(ctx context.Context, eventID, deviceID uuid.UUID, unlockCode string) (*frontend.Session, error) {
logger := log.With(s.logger, "method", "UnlockDevice")
if eventID == uuid.Nil {
level.Warn(logger).Log("err", frontend.ErrRequireEventID)
return nil, frontend.ErrRequireEventID
}
if deviceID == uuid.Nil {
level.Warn(logger).Log("err", frontend.ErrRequireDeviceID)
return nil, frontend.ErrRequireDeviceID
}
unlockCode = strings.Trim(unlockCode, "\r\n\t ")
if unlockCode == "" {
level.Warn(logger).Log("err", frontend.ErrRequireUnlockCode)
return nil, frontend.ErrRequireUnlockCode
}
session, err := s.devClient.Unlock(ctx, eventID, deviceID, unlockCode)
switch err {
case nil:
return &frontend.Session{
EventID: eventID,
EventCaption: session.EventCaption,
DeviceID: deviceID,
DeviceCaption: session.DeviceCaption,
Token: "TOKEN",
}, nil
case device.ErrUnlockNotFound:
return nil, frontend.ErrUnlockNotFound
default:
return nil, frontend.ErrService
}
}
// Generate returns a new QR code device unlock image based on the provided details.
func (s *service) GenerateQR(ctx context.Context, eventID, deviceID uuid.UUID, unlockCode string) ([]byte, error) {
logger := log.With(s.logger, "method", "GenerateQR")
if eventID == uuid.Nil {
level.Warn(logger).Log("err", frontend.ErrRequireEventID)
return nil, frontend.ErrRequireEventID
}
if deviceID == uuid.Nil {
level.Warn(logger).Log("err", frontend.ErrRequireDeviceID)
return nil, frontend.ErrRequireDeviceID
}
unlockCode = strings.Trim(unlockCode, "\r\n\t ")
if unlockCode == "" {
level.Warn(logger).Log("err", frontend.ErrRequireUnlockCode)
return nil, frontend.ErrRequireUnlockCode
}
data, err := s.qrClient.Generate(
ctx, eventID.String()+":"+deviceID.String()+":"+unlockCode, qr.LevelM, 256,
)
switch err {
case nil:
return data, nil
case qr.ErrNoContent, qr.ErrInvalidSize, qr.ErrInvalidRecoveryLevel,
qr.ErrContentTooLarge:
return nil, frontend.ErrInvalidQRParams
case qr.ErrGenerate:
return nil, frontend.ErrQRGenerate
default:
return nil, frontend.ErrService
}
}