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event.go
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event.go
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//
// Copyright (C) 2020 IOTech Ltd
//
// SPDX-License-Identifier: Apache-2.0
package redis
import (
"encoding/json"
"fmt"
"github.com/edgexfoundry/edgex-go/internal/pkg/common"
"github.com/edgexfoundry/go-mod-core-contracts/errors"
"github.com/edgexfoundry/go-mod-core-contracts/v2"
"github.com/edgexfoundry/go-mod-core-contracts/v2/models"
"github.com/gomodule/redigo/redis"
)
const (
EventsCollection = "v2:event"
EventsCollectionCreated = EventsCollection + ":" + v2.Created
EventsCollectionPushed = EventsCollection + ":" + v2.Pushed
EventsCollectionDeviceName = EventsCollection + ":" + v2.Device + ":" + v2.Name
EventsCollectionReadings = EventsCollection + ":readings"
)
// eventStoredKey return the event's stored key which combines the collection name and object id
func eventStoredKey(id string) string {
return fmt.Sprintf("%s:%s", EventsCollection, id)
}
// ************************** DB HELPER FUNCTIONS ***************************
func addEvent(conn redis.Conn, e models.Event) (addedEvent models.Event, edgeXerr errors.EdgeX) {
// query Event by Id first to avoid the Id conflict
_, edgeXerr = eventById(conn, e.Id)
if errors.Kind(edgeXerr) != errors.KindEntityDoesNotExist {
return addedEvent, errors.NewCommonEdgeX(errors.KindDuplicateName, "Event Id exists", nil)
}
edgeXerr = nil
if e.Created == 0 {
e.Created = common.MakeTimestamp()
}
event := models.Event{
Id: e.Id,
Pushed: e.Pushed,
DeviceName: e.DeviceName,
Created: e.Created,
Origin: e.Origin,
Tags: e.Tags,
}
m, err := json.Marshal(event)
if err != nil {
return addedEvent, errors.NewCommonEdgeX(errors.KindContractInvalid, "event parsing failed", err)
}
storedKey := eventStoredKey(e.Id)
_ = conn.Send(MULTI)
// use the SET command to save event as blob
_ = conn.Send(SET, storedKey, m)
_ = conn.Send(ZADD, EventsCollection, e.Created, storedKey)
_ = conn.Send(ZADD, EventsCollectionCreated, e.Created, storedKey)
_ = conn.Send(ZADD, EventsCollectionPushed, e.Pushed, storedKey)
_ = conn.Send(ZADD, fmt.Sprintf("%s:%s", EventsCollectionDeviceName, e.DeviceName), e.Created, storedKey)
// add reading ids as sorted set under each event id
// sort by the order provided by device service
rids := make([]interface{}, len(e.Readings)*2+1)
rids[0] = fmt.Sprintf("%s:%s", EventsCollectionReadings, e.Id)
var newReadings []models.Reading
for i, r := range e.Readings {
newReading, err := addReading(conn, r)
if err != nil {
return models.Event{}, err
}
newReadings = append(newReadings, newReading)
// set the sorted set score to the index of the reading
rids[i*2+1] = i
rids[i*2+2] = fmt.Sprintf("%s:%s", ReadingsCollection, newReading.GetBaseReading().Id)
}
e.Readings = newReadings
if len(rids) > 1 {
_ = conn.Send(ZADD, rids...)
}
_, err = conn.Do(EXEC)
if err != nil {
edgeXerr = errors.NewCommonEdgeX(errors.KindDatabaseError, "event creation failed", err)
}
return e, edgeXerr
}
func deleteEventById(conn redis.Conn, id string) (edgeXerr errors.EdgeX) {
// query Event by Id first to ensure there is an corresponding event
e, edgeXerr := eventById(conn, id)
if edgeXerr != nil {
return edgeXerr
}
// deletes all readings associated with target event
for _, reading := range e.Readings {
edgeXerr = deleteReadingById(conn, reading.GetBaseReading().Id)
if edgeXerr != nil {
return edgeXerr
}
}
storedKey := eventStoredKey(e.Id)
_ = conn.Send(MULTI)
_ = conn.Send(UNLINK, storedKey)
_ = conn.Send(UNLINK, fmt.Sprintf("%s:%s", EventsCollectionReadings, e.Id))
_ = conn.Send(ZREM, EventsCollection, storedKey)
_ = conn.Send(ZREM, EventsCollectionCreated, storedKey)
_ = conn.Send(ZREM, EventsCollectionPushed, storedKey)
_ = conn.Send(ZREM, fmt.Sprintf("%s:%s", EventsCollectionDeviceName, e.DeviceName), storedKey)
res, err := redis.Values(conn.Do(EXEC))
if err != nil {
return errors.NewCommonEdgeX(errors.KindDatabaseError, "event delete failed", err)
}
exists, _ := redis.Bool(res[0], nil)
if !exists {
return errors.NewCommonEdgeX(errors.KindDatabaseError, "event delete failed", redis.ErrNil)
}
return edgeXerr
}
func eventById(conn redis.Conn, id string) (event models.Event, edgeXerr errors.EdgeX) {
edgeXerr = getObjectById(conn, eventStoredKey(id), &event)
if edgeXerr != nil {
return event, errors.NewCommonEdgeXWrapper(edgeXerr)
}
event.Readings, edgeXerr = readingsByEventId(conn, id)
if edgeXerr != nil {
return event, errors.NewCommonEdgeXWrapper(edgeXerr)
}
return
}
func (c *Client) eventTotalCount(conn redis.Conn) (uint32, errors.EdgeX) {
count, err := redis.Int(conn.Do(ZCARD, EventsCollection))
if err != nil {
return 0, errors.NewCommonEdgeX(errors.KindDatabaseError, "count event failed", err)
}
return uint32(count), nil
}
func (c *Client) eventCountByDevice(deviceName string, conn redis.Conn) (uint32, errors.EdgeX) {
count, err := redis.Int(conn.Do(ZCARD, fmt.Sprintf("%s:%s", EventsCollectionDeviceName, deviceName)))
if err != nil {
return 0, errors.NewCommonEdgeX(errors.KindDatabaseError, "count event failed", err)
}
return uint32(count), nil
}
func updateEventPushedById(conn redis.Conn, id string) (edgeXerr errors.EdgeX) {
// query Event by Id first to retrieve corresponding event
e, edgeXerr := eventById(conn, id)
if edgeXerr != nil {
return edgeXerr
}
// update the pushed timestamp
event := models.Event{
Id: e.Id,
Pushed: common.MakeTimestamp(),
DeviceName: e.DeviceName,
Created: e.Created,
Origin: e.Origin,
Tags: e.Tags,
}
m, err := json.Marshal(event)
if err != nil {
return errors.NewCommonEdgeX(errors.KindContractInvalid, "event parsing failed", err)
}
storedKey := eventStoredKey(event.Id)
_ = conn.Send(MULTI)
// use the SET command to overwrite the updated event as blob
_ = conn.Send(SET, storedKey, m)
// EventsCollectionPushed sorted set uses pushed as the score, and ZADD command will update the score of the event
_ = conn.Send(ZADD, EventsCollectionPushed, event.Pushed, storedKey)
_, err = conn.Do(EXEC)
if err != nil {
return errors.NewCommonEdgeX(errors.KindDatabaseError, "event pushed update failed", err)
}
return nil
}
func (c *Client) allEvents(conn redis.Conn, offset int, limit int) (events []models.Event, edgeXerr errors.EdgeX) {
end := offset + limit - 1
if limit == -1 { //-1 limit means that clients want to retrieve all remaining records after offset from DB, so specifying -1 for end
end = limit
}
objects, err := getObjectsByRevRange(conn, EventsCollection, offset, end)
if err != nil {
return events, errors.NewCommonEdgeXWrapper(err)
}
events = make([]models.Event, len(objects))
for i, in := range objects {
e := models.Event{}
err := json.Unmarshal(in, &e)
if err != nil {
return []models.Event{}, errors.NewCommonEdgeX(errors.KindDatabaseError, "event format parsing failed from the database", err)
}
e.Readings, edgeXerr = readingsByEventId(conn, e.Id)
if edgeXerr != nil {
return events, errors.NewCommonEdgeXWrapper(edgeXerr)
}
events[i] = e
}
return events, nil
}
// eventsByDeviceName query events by offset, limit and device name
func eventsByDeviceName(conn redis.Conn, offset int, limit int, name string) (events []models.Event, edgeXerr errors.EdgeX) {
end := offset + limit - 1
if limit == -1 { //-1 limit means that clients want to retrieve all remaining records after offset from DB, so specifying -1 for end
end = limit
}
objects, err := getObjectsByRevRange(conn, fmt.Sprintf("%s:%s", EventsCollectionDeviceName, name), offset, end)
if err != nil {
return events, errors.NewCommonEdgeXWrapper(err)
}
events = make([]models.Event, len(objects))
for i, in := range objects {
e := models.Event{}
err := json.Unmarshal(in, &e)
if err != nil {
return events, errors.NewCommonEdgeX(errors.KindContractInvalid, "event parsing failed", err)
}
e.Readings, edgeXerr = readingsByEventId(conn, e.Id)
if edgeXerr != nil {
return events, errors.NewCommonEdgeXWrapper(edgeXerr)
}
events[i] = e
}
return events, nil
}