101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
// Copyright (c) Mainflux
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// SPDX-License-Identifier: Apache-2.0
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// Package coap contains the domain concept definitions needed to support
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// Mainflux CoAP adapter service functionality. All constant values are taken
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// from RFC, and could be adjusted based on specific use case.
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package coap
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import (
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"context"
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"fmt"
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"sync"
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"github.com/mainflux/mainflux/pkg/errors"
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"github.com/mainflux/mainflux"
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"github.com/mainflux/mainflux/pkg/messaging"
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)
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const chansPrefix = "channels"
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// ErrUnsubscribe indicates an error to unsubscribe
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var ErrUnsubscribe = errors.New("unable to unsubscribe")
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// Service specifies CoAP service API.
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type Service interface {
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// Publish Messssage
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Publish(ctx context.Context, key string, msg messaging.Message) error
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// Subscribes to channel with specified id, subtopic and adds subscription to
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// service map of subscriptions under given ID.
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Subscribe(ctx context.Context, key, chanID, subtopic string, c Client) error
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// Unsubscribe method is used to stop observing resource.
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Unsubscribe(ctx context.Context, key, chanID, subptopic, token string) error
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}
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var _ Service = (*adapterService)(nil)
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// Observers is a map of maps,
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type adapterService struct {
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auth mainflux.ThingsServiceClient
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pubsub messaging.PubSub
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obsLock sync.Mutex
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}
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// New instantiates the CoAP adapter implementation.
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func New(auth mainflux.ThingsServiceClient, pubsub messaging.PubSub) Service {
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as := &adapterService{
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auth: auth,
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pubsub: pubsub,
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obsLock: sync.Mutex{},
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}
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return as
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}
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func (svc *adapterService) Publish(ctx context.Context, key string, msg messaging.Message) error {
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ar := &mainflux.AccessByKeyReq{
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Token: key,
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ChanID: msg.Channel,
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}
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thid, err := svc.auth.CanAccessByKey(ctx, ar)
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if err != nil {
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return errors.Wrap(errors.ErrAuthorization, err)
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}
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msg.Publisher = thid.GetValue()
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return svc.pubsub.Publish(msg.Channel, msg)
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}
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func (svc *adapterService) Subscribe(ctx context.Context, key, chanID, subtopic string, c Client) error {
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ar := &mainflux.AccessByKeyReq{
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Token: key,
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ChanID: chanID,
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}
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if _, err := svc.auth.CanAccessByKey(ctx, ar); err != nil {
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return errors.Wrap(errors.ErrAuthorization, err)
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}
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subject := fmt.Sprintf("%s.%s", chansPrefix, chanID)
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if subtopic != "" {
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subject = fmt.Sprintf("%s.%s", subject, subtopic)
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}
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return svc.pubsub.Subscribe(c.Token(), subject, c)
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}
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func (svc *adapterService) Unsubscribe(ctx context.Context, key, chanID, subtopic, token string) error {
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ar := &mainflux.AccessByKeyReq{
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Token: key,
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ChanID: chanID,
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}
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if _, err := svc.auth.CanAccessByKey(ctx, ar); err != nil {
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return errors.Wrap(errors.ErrAuthorization, err)
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}
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subject := fmt.Sprintf("%s.%s", chansPrefix, chanID)
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if subtopic != "" {
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subject = fmt.Sprintf("%s.%s", subject, subtopic)
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}
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return svc.pubsub.Unsubscribe(token, subject)
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}
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