From cce1403822094828e5a96b9b125b339890b7f100 Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Tue, 20 Mar 2018 12:13:47 +0200
Subject: [PATCH] Don't panic if session loading fails

---
 config/config.go  |  6 +++---
 config/session.go | 26 ++++++++++++++------------
 2 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/config/config.go b/config/config.go
index d4ede80..858f1d2 100644
--- a/config/config.go
+++ b/config/config.go
@@ -30,13 +30,13 @@ type Config struct {
 	MXID string `yaml:"mxid"`
 	HS   string `yaml:"homeserver"`
 
-	dir     string        `yaml:"-"`
-	Session *Session      `yaml:"-"`
+	dir     string   `yaml:"-"`
+	Session *Session `yaml:"-"`
 }
 
 func NewConfig(dir string) *Config {
 	return &Config{
-		dir:   dir,
+		dir: dir,
 	}
 }
 
diff --git a/config/session.go b/config/session.go
index a90fc20..6de9436 100644
--- a/config/session.go
+++ b/config/session.go
@@ -35,9 +35,9 @@ type Session struct {
 	Rooms       map[string]*rooms.Room
 }
 
-func (config *Config) LoadSession(mxid string) {
+func (config *Config) LoadSession(mxid string) error {
 	config.Session = config.NewSession(mxid)
-	config.Session.Load()
+	return config.Session.Load()
 }
 
 func (config *Config) NewSession(mxid string) *Session {
@@ -55,32 +55,34 @@ func (s *Session) Clear() {
 	s.Save()
 }
 
-func (s *Session) Load() {
+func (s *Session) Load() error {
 	data, err := ioutil.ReadFile(s.path)
 	if err != nil {
-		debug.Print("Failed to read session from", s.path)
-		panic(err)
+		debug.Print("Failed to read session from", s.path, err)
+		return err
 	}
 
 	err = json.Unmarshal(data, s)
 	if err != nil {
-		debug.Print("Failed to parse session at", s.path)
-		panic(err)
+		debug.Print("Failed to parse session at", s.path, err)
+		return err
 	}
+	return nil
 }
 
-func (s *Session) Save() {
+func (s *Session) Save() error {
 	data, err := json.Marshal(s)
 	if err != nil {
-		debug.Print("Failed to marshal session of", s.MXID)
-		panic(err)
+		debug.Print("Failed to marshal session of", s.MXID, err)
+		return err
 	}
 
 	err = ioutil.WriteFile(s.path, data, 0600)
 	if err != nil {
-		debug.Print("Failed to write session to", s.path)
-		panic(err)
+		debug.Print("Failed to write session to", s.path, err)
+		return err
 	}
+	return nil
 }
 
 func (s *Session) LoadFilterID(_ string) string {