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package main
import (
"encoding/binary"
"errors"
"fmt"
"time"
"github.com/cockroachdb/pebble/v2"
pb "github.com/meshnet-gophers/meshtastic-go/meshtastic"
"google.golang.org/protobuf/proto"
)
type BucketEnum uint16
const (
BucketState BucketEnum = iota
BucketNodeInfo
BucketFromRadio
)
type StateKeyEnum uint32
const (
StateKeyNull StateKeyEnum = iota
StateKeyPhoneLastUpdate
)
var (
errNotExists = errors.New("not exist")
)
type Database struct {
p *pebble.DB
}
func NewDB(dbPath string) (*Database, error) {
p, err := pebble.Open(dbPath, &pebble.Options{})
if err != nil {
return nil, fmt.Errorf("open database: %w", err)
}
return &Database{
p: p,
}, nil
}
func (db *Database) Close() error {
return db.p.Close()
}
func (db *Database) keyUint32(bucket BucketEnum, k uint32) []byte {
var key [6]byte
binary.BigEndian.PutUint16(key[0:2], uint16(bucket))
binary.BigEndian.PutUint32(key[2:6], k)
return key[:]
}
func (db *Database) keyUint64(bucket BucketEnum, k uint64) []byte {
var key [10]byte
binary.BigEndian.PutUint16(key[0:2], uint16(bucket))
binary.BigEndian.PutUint64(key[2:10], k)
return key[:]
}
func (db *Database) Get(key []byte) ([]byte, error) {
data, rd, err := db.p.Get(key)
if err == pebble.ErrNotFound {
return nil, errNotExists
} else if err != nil {
return nil, err
}
defer rd.Close()
return data, nil
}
func (db *Database) Set(key []byte, value []byte) error {
return db.p.Set(key, value, pebble.Sync)
}
func (db *Database) GetState(key StateKeyEnum) ([]byte, error) {
data, rd, err := db.p.Get(db.keyUint32(BucketState, uint32(key)))
if err == pebble.ErrNotFound {
return nil, errNotExists
} else if err != nil {
return nil, err
}
defer rd.Close()
return data, nil
}
func (db *Database) SetState(key StateKeyEnum, value []byte) error {
return db.p.Set(db.keyUint32(BucketState, uint32(key)), value, pebble.Sync)
}
func (db *Database) SetNodeInfo(num uint32, ni *pb.NodeInfo) error {
key := db.keyUint32(BucketNodeInfo, num)
if num != 0 && ni.Num == 0 {
return db.p.Delete(key, pebble.Sync)
}
ni.Num = num
data, err := proto.Marshal(ni)
if err != nil {
return err
}
return db.p.Set(key, data, pebble.Sync)
}
func (db *Database) GetNodeInfo(num uint32) (*pb.NodeInfo, error) {
data, rd, err := db.p.Get(db.keyUint32(BucketNodeInfo, num))
if err == pebble.ErrNotFound {
return nil, errNotExists
} else if err != nil {
return nil, err
}
defer rd.Close()
var ni pb.NodeInfo
if err = proto.Unmarshal(data, &ni); err != nil {
return nil, err
}
return &ni, nil
}
func (db *Database) ListNodeInfo() ([]*pb.NodeInfo, error) {
it, err := db.p.NewIter(&pebble.IterOptions{
LowerBound: db.keyUint32(BucketNodeInfo, uint32(0)),
UpperBound: db.keyUint32(BucketNodeInfo+1, uint32(0)),
})
if err != nil {
return nil, err
}
defer it.Close()
var list []*pb.NodeInfo
for it.First(); it.Valid(); it.Next() {
key := it.Key()
data := it.Value()
ni := &pb.NodeInfo{}
if err = proto.Unmarshal(data, ni); err != nil {
return nil, err
}
ni.Num = binary.BigEndian.Uint32(key[2:6])
list = append(list, ni)
}
return list, nil
}
func (db *Database) StoreFromRadio(tsMicro int64, msg *pb.FromRadio) error {
b, err := proto.Marshal(msg)
if err != nil {
return err
}
return db.p.Set(db.keyUint64(BucketFromRadio, uint64(tsMicro)), b, pebble.Sync)
}
func (db *Database) ReadFromRadio(start, end time.Time) (<-chan *pb.FromRadio, <-chan error) {
c := make(chan *pb.FromRadio)
errc := make(chan error, 1)
lowerLimit := uint64(start.UnixMicro())
upperLimit := uint64(end.UnixMicro())
go func() {
defer close(c)
defer close(errc)
it, err := db.p.NewIter(&pebble.IterOptions{
LowerBound: db.keyUint64(BucketFromRadio, lowerLimit),
UpperBound: db.keyUint64(BucketFromRadio+1, upperLimit),
})
if err != nil {
errc <- err
return
}
defer it.Close()
for it.First(); it.Valid(); it.Next() {
key := it.Key()
data := it.Value()
tsMicro := binary.BigEndian.Uint64(key[2:])
if tsMicro > upperLimit {
continue
}
msg := &pb.FromRadio{}
if err = proto.Unmarshal(data, msg); err != nil {
errc <- err
return
}
c <- msg
}
}()
return c, errc
}
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