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persist.go
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/
persist.go
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// Copyright 2016 David Lazar. All rights reserved.
// Use of this source code is governed by the GNU AGPL
// license that can be found in the LICENSE file.
package alpenhorn
import (
"crypto/ed25519"
"encoding/json"
"io/ioutil"
"vuvuzela.io/alpenhorn/config"
"vuvuzela.io/internal/ioutil2"
)
//easyjson:readable
type persistedState struct {
Username string
LongTermPublicKey ed25519.PublicKey
LongTermPrivateKey ed25519.PrivateKey
PKGLoginKey ed25519.PrivateKey
AddFriendConfig *config.SignedConfig
DialingConfig *config.SignedConfig
IncomingFriendRequests []*IncomingFriendRequest
OutgoingFriendRequests []*OutgoingFriendRequest
SentFriendRequests []*sentFriendRequest
Friends map[string]*persistedFriend
}
// persistedFriend is the persisted representation of the Friend type.
// We use this because Friend.extraData is unexported but must be persisted.
//easyjson:readable
type persistedFriend struct {
Username string
LongTermKey ed25519.PublicKey
ExtraData []byte
}
// LoadClient loads a client from persisted state at the given path.
// You should set the client's KeywheelPersistPath before connecting.
func LoadClient(clientPersistPath, keywheelPersistPath string) (*Client, error) {
clientData, err := ioutil.ReadFile(clientPersistPath)
if err != nil {
return nil, err
}
st := new(persistedState)
err = json.Unmarshal(clientData, st)
if err != nil {
return nil, err
}
keywheelData, err := ioutil.ReadFile(keywheelPersistPath)
if err != nil {
return nil, err
}
c := &Client{
ClientPersistPath: clientPersistPath,
KeywheelPersistPath: keywheelPersistPath,
}
err = c.wheel.UnmarshalBinary(keywheelData)
if err != nil {
return nil, err
}
c.loadStateLocked(st)
return c, nil
}
func (c *Client) loadStateLocked(st *persistedState) {
c.Username = st.Username
c.LongTermPublicKey = st.LongTermPublicKey
c.LongTermPrivateKey = st.LongTermPrivateKey
c.PKGLoginKey = st.PKGLoginKey
c.addFriendConfig = st.AddFriendConfig
c.addFriendConfigHash = st.AddFriendConfig.Hash()
c.dialingConfig = st.DialingConfig
c.dialingConfigHash = st.DialingConfig.Hash()
c.incomingFriendRequests = st.IncomingFriendRequests
c.outgoingFriendRequests = st.OutgoingFriendRequests
c.sentFriendRequests = st.SentFriendRequests
for _, req := range c.incomingFriendRequests {
req.client = c
}
for _, req := range c.outgoingFriendRequests {
req.client = c
}
for _, req := range c.sentFriendRequests {
req.client = c
}
c.friends = make(map[string]*Friend, len(st.Friends))
for username, friend := range st.Friends {
c.friends[username] = &Friend{
Username: friend.Username,
LongTermKey: friend.LongTermKey,
extraData: friend.ExtraData,
client: c,
}
}
}
// Persist writes the client's state to disk. The client persists
// itself automatically, so Persist is only needed when creating
// a new client.
func (c *Client) Persist() error {
c.mu.Lock()
err := c.persistLocked()
c.mu.Unlock()
return err
}
// persistLocked persists the client state and keywheel state, assuming
// c.mu is locked. The keywheel and client state are usually persisted
// at the same time to avoid leaking metadata.
func (c *Client) persistLocked() error {
err := c.persistClientLocked()
if e := c.persistKeywheelLocked(); err == nil {
err = e
}
return err
}
func (c *Client) persistClient() error {
c.mu.Lock()
err := c.persistClientLocked()
c.mu.Unlock()
return err
}
func (c *Client) persistClientLocked() error {
if c.ClientPersistPath == "" {
return nil
}
st := &persistedState{
Username: c.Username,
LongTermPublicKey: c.LongTermPublicKey,
LongTermPrivateKey: c.LongTermPrivateKey,
PKGLoginKey: c.PKGLoginKey,
AddFriendConfig: c.addFriendConfig,
DialingConfig: c.dialingConfig,
IncomingFriendRequests: c.incomingFriendRequests,
OutgoingFriendRequests: c.outgoingFriendRequests,
SentFriendRequests: c.sentFriendRequests,
Friends: make(map[string]*persistedFriend, len(c.friends)),
}
for username, friend := range c.friends {
st.Friends[username] = &persistedFriend{
Username: friend.Username,
LongTermKey: friend.LongTermKey,
ExtraData: friend.extraData,
}
}
data, err := json.MarshalIndent(st, "", " ")
if err != nil {
return err
}
return ioutil2.WriteFileAtomic(c.ClientPersistPath, data, 0600)
}
func (c *Client) persistKeywheel() error {
c.mu.Lock()
err := c.persistKeywheelLocked()
c.mu.Unlock()
return err
}
func (c *Client) persistKeywheelLocked() error {
if c.KeywheelPersistPath == "" {
return nil
}
data, err := c.wheel.MarshalBinary()
if err != nil {
return err
}
return ioutil2.WriteFileAtomic(c.KeywheelPersistPath, data, 0600)
}