forked from google/simhospital
/
persistdb.go
229 lines (200 loc) · 5.33 KB
/
persistdb.go
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package persistdb
import (
"encoding/json"
"sort"
//"log"
//"reflect"
//"github.com/golang-collections/go-datastructures/queue"
"github.com/pkg/errors"
"github.com/Arend-melissant/simhospital/pkg/state/persist"
bolt "github.com/coreos/bbolt"
"github.com/Arend-melissant/simhospital/pkg/state"
"github.com/Arend-melissant/simhospital/pkg/logging"
)
const (
MessageSyncer int = 0
EventSyncer = 1
PatientSyncer = 2
)
const dbName = "simhosp.db"
var log = logging.ForCallerPackage()
// ItemSyncer implements the persist.ItemSyncer interface using a map.
// It tracks the LoadByID requests made to the syncer in the form of an
// internal `reqs` map for testing purposes.
type DbItemSyncer struct {
m map[string]persist.MarshallableItem
// delete indicates whether to delete items or not.
delete bool
nDeletes int
syncType int
}
// NewItemSyncer initializes the ItemSyncer.
func NewItemSyncer(syncType int) *DbItemSyncer {
db, err := bolt.Open(dbName, 0600, nil)
if err != nil {
log.Fatal(err)
}
defer db.Close()
db.Update(func(tx *bolt.Tx) error {
_, err1 := tx.CreateBucket([]byte("HL7Message"))
if err1 != nil {
log.Errorf("create bucket: %s", err1)
}
_, err2 := tx.CreateBucket([]byte("Event"))
if err2 != nil {
log.Errorf("create bucket: %s", err2)
}
_, err3 := tx.CreateBucket([]byte("Patient"))
if err3 != nil {
log.Errorf("create bucket: %s", err3)
}
return nil
})
return &DbItemSyncer{m: map[string]persist.MarshallableItem{}, syncType: syncType}
}
// NewItemSyncerWithDelete initializes the ItemSyncer with a value for whether to delete items or not.
func NewItemSyncerWithDelete(syncType int, delete bool) *DbItemSyncer {
return &DbItemSyncer{m: map[string]persist.MarshallableItem{}, delete: delete, syncType: syncType}
}
func (s *DbItemSyncer) getSyncType() string {
var str string
str = "unknown"
switch s.syncType {
case PatientSyncer:
str = "Patient"
case EventSyncer:
str = "Event"
case MessageSyncer:
str = "HL7Message"
default:
}
return str
}
//func storeItem(s *DbItemSyncer, )
// Write writes an item to the map.
func (s *DbItemSyncer) Write(item persist.MarshallableItem) error {
b,_ := json.Marshal(item)
str := s.getSyncType()
id, err := item.ID()
if err != nil {
return errors.Wrap(err, "cannot get ID")
}
log.Infof("PersistDB: WRITE - %s - %s",str,id)
// s.m[id] = item
db, err := bolt.Open(dbName, 0600, nil)
if err != nil {
log.Fatal(err)
}
defer db.Close()
db.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(str))
err := bucket.Put([]byte(id), []byte(b))
return err
})
return nil
}
// Delete deletes an item from the map.
func (s *DbItemSyncer) Delete(item persist.MarshallableItem) error {
if !s.delete {
return nil
}
str := s.getSyncType()
s.nDeletes++
id, err := item.ID()
if err != nil {
return errors.Wrap(err, "cannot get ID")
}
log.Infof("PersistDB: DELETE - %s - %s",str,id)
db, err := bolt.Open(dbName, 0600, nil)
if err != nil {
log.Fatal(err)
}
defer db.Close()
db.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(str))
err := bucket.Delete([]byte(id))
return err
})
return nil
}
func GetAllDataFromBucket[T persist.MarshallableItem](s *DbItemSyncer) ([]persist.MarshallableItem, error) {
str := s.getSyncType()
log.Infof("LOADALL - %s", str)
db, err := bolt.Open(dbName, 0600, nil)
if err != nil {
log.Fatal(err)
}
defer db.Close()
data := make(map[string]T)
db.View(func(tx *bolt.Tx) error {
// Assume bucket exists and has keys
b := tx.Bucket([]byte(str))
b.ForEach(func(k, v []byte) error {
var dat T
jerr := json.Unmarshal(v, &dat)
if jerr == nil {
data[string(k)] = dat
} else {
//fmt.Println(jerr)
}
return nil
})
return nil
})
keys := make([]string, 0)
for id := range data {
keys = append(keys, id)
}
sort.Strings(keys)
sorted := make([]persist.MarshallableItem, len(keys))
for i, k := range keys {
sorted[i] = data[k]
}
return sorted, nil
}
// LoadAll returns a slice of all the items in the map, sorted by id.
func (s *DbItemSyncer) LoadAll() ([]persist.MarshallableItem, error) {
str := s.getSyncType()
if (str == "HL7Message") {
data, _ := GetAllDataFromBucket[state.HL7Message](s)
return data, nil
} else if (str == "Event") {
data, _ := GetAllDataFromBucket[state.Event](s)
return data, nil
} else {
data, _ := GetAllDataFromBucket[state.Patient](s)
return data, nil
}
}
// LoadByID returns an item in the map with the provided id, if it exists.
func (s *DbItemSyncer) LoadByID(id string) (persist.MarshallableItem, error) {
str := s.getSyncType()
log.Infof("PersistDB: LOADBYID - %s - %s",str,id)
db, err := bolt.Open(dbName, 0600, nil)
if err != nil {
log.Fatal(err)
}
defer db.Close()
var dat state.Patient
db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(str))
v := b.Get([]byte(id))
if jerr := json.Unmarshal(v, &dat); err != nil {
panic(jerr)
}
return nil
})
return dat, nil
}
// Count returns number of elements in the syncer for testing.
func (s *DbItemSyncer) Count() int {
//str := s.getSyncType()
//fmt.Println("PersistDB: COUNT " + str)
return len(s.m)
}
// CountDeletes returns the number of deletions requested.
func (s *DbItemSyncer) CountDeletes() int {
//str := s.getSyncType()
//fmt.Println("PersistDB: COUNTDELETES " + str)
return s.nDeletes
}