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package models
import (
"bytes"
"crypto/sha256"
"encoding/gob"
"fmt"
"time"
"git.capotej.com/capotej/communique/config"
"github.com/dgraph-io/badger/v3"
"github.com/segmentio/ksuid"
)
type OutboxItem struct {
Handler config.Handler
Content []byte
Id []byte
Sha256 string
CreatedAt time.Time
}
// used for lookup purposes (count, collect, find)
func NewOutboxItem(h config.Handler) *OutboxItem {
aso := &OutboxItem{Handler: h}
return aso
}
func CreateOutboxItem(h config.Handler, content []byte) *OutboxItem {
t := time.Now()
hash := sha256.New()
hash.Write(content)
binHash := hash.Sum(nil)
k, _ := ksuid.NewRandomWithTime(t)
aso := &OutboxItem{
Handler: h,
CreatedAt: t,
Content: content,
Sha256: fmt.Sprintf("%x", binHash),
Id: []byte(k.String()), // NOTE: we want the bytes of the string representation of a hash, NOT a binary hash
}
return aso
}
func (a *OutboxItem) Name() string {
return "OutboxItem"
}
func (a *OutboxItem) Key() string {
return fmt.Sprintf("%s:%s", a.Keybase(), a.Id)
}
func (a *OutboxItem) DedupKey() string {
return fmt.Sprintf("dd:%s:sha256:%s", a.Keybase(), a.Sha256)
}
func (a *OutboxItem) Keybase() string {
keyBase := fmt.Sprintf("outboxes:%s", a.Handler.Name)
return keyBase
}
func (a *OutboxItem) SaveDedup(txn *badger.Txn) error {
if len(a.Content) == 0 {
return fmt.Errorf("content not set")
}
if len(a.Sha256) == 0 {
return fmt.Errorf("sha256 not set")
}
e := badger.NewEntry([]byte(a.DedupKey()), nil).WithTTL(a.Handler.DedupWindow)
return txn.SetEntry(e)
}
func (a *OutboxItem) Save(txn *badger.Txn) error {
if len(a.Content) == 0 {
return fmt.Errorf("content not set")
}
if len(a.Id) == 0 {
return fmt.Errorf("id not set")
}
if len(a.Sha256) == 0 {
return fmt.Errorf("sha256 not set")
}
var network bytes.Buffer
enc := gob.NewEncoder(&network)
err := enc.Encode(a)
if err != nil {
return fmt.Errorf("could not encode outbox item: %w", err)
}
e := badger.NewEntry([]byte(a.Key()), network.Bytes())
return txn.SetEntry(e)
}
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