SMTP server is running with new config engine

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config.go

@@ -4,11 +4,27 @@ import (
 	"container/list"
 	"fmt"
 	"github.com/robfig/goconfig/config"
+	"net"
 	"os"
 )
 
+// SmtpConfig houses the SMTP server configuration - not using pointers
+// so that I can pass around copies of the object safely.
+type SmtpConfig struct {
+	Ip4address net.IP
+	Ip4port    int
+	Domain     string
+}
+
+var smtpConfig *SmtpConfig
+
 var Config *config.Config
 
+// GetSmtpConfig returns a copy of the SmtpConfig
+func GetSmtpConfig() SmtpConfig {
+	return *smtpConfig
+}
+
 // LoadConfig loads the specified configuration file into inbucket.Config
 // and performs validations on it.
 func LoadConfig(filename string) error {
@@ -49,6 +65,44 @@ func LoadConfig(filename string) error {
 		return fmt.Errorf("Failed to validate configuration")
 	}
 
+	err = parseSmtpConfig()
+
+	return err
+}
+
+// parseSmtpConfig trying to catch config errors early
+func parseSmtpConfig() error {
+	smtpConfig = new(SmtpConfig)
+
+	// Parse IP4 address only, error on IP6.
+	option := "[smtp]ip4.address"
+	str, err := Config.String("smtp", "ip4.address")
+	if err != nil {
+		return fmt.Errorf("Failed to parse %v: %v", option, err)
+	}
+	addr := net.ParseIP(str)
+	if addr == nil {
+		return fmt.Errorf("Failed to parse %v '%v'", option, str)
+	}
+	addr = addr.To4()
+	if addr == nil {
+		return fmt.Errorf("Failed to parse %v '%v' not IPv4!", option, str)
+	}
+	smtpConfig.Ip4address = addr
+
+	option = "[smtp]ip4.port"
+	smtpConfig.Ip4port, err = Config.Int("smtp", "ip4.port")
+	if err != nil {
+		return fmt.Errorf("Failed to parse %v: %v", option, err)
+	}
+
+	option = "[smtp]domain"
+	str, err = Config.String("smtp", "domain")
+	if err != nil {
+		return fmt.Errorf("Failed to parse %v: %v", option, err)
+	}
+	smtpConfig.Domain = str
+
 	return nil
 }
 

datastore.go

@@ -5,7 +5,6 @@ import (
 	"encoding/gob"
 	"errors"
 	"fmt"
-	"github.com/robfig/revel"
 	"io/ioutil"
 	"net/mail"
 	"os"
@@ -38,16 +37,20 @@ type DataStore struct {
 	mailPath string
 }
 
-// NewDataStore creates a new DataStore object.  It uses the Revel Config object to
+// NewDataStore creates a new DataStore object.  It uses the inbucket.Config object to
 // construct it's path.
 func NewDataStore() *DataStore {
-	path, found := rev.Config.String("datastore.path")
+	path, err := Config.String("datastore", "path")
-	if found {
+	if err != nil {
+		Error("Error getting datastore path: %v", err)
+		return nil
+	}
+	if path == "" {
+		Error("No value configured for datastore path")
+		return nil
+	}
 	mailPath := filepath.Join(path, "mail")
 	return &DataStore{path: path, mailPath: mailPath}
-	}
-	rev.ERROR.Printf("No value configured for datastore.path")
-	return nil
 }
 
 // Retrieves the Mailbox object for a specified email address, if the mailbox
@@ -57,7 +60,7 @@ func (ds *DataStore) MailboxFor(emailAddress string) (*Mailbox, error) {
 	dir := HashMailboxName(name)
 	path := filepath.Join(ds.mailPath, dir)
 	if err := os.MkdirAll(path, 0770); err != nil {
-		rev.ERROR.Printf("Failed to create directory %v, %v", path, err)
+		Error("Failed to create directory %v, %v", path, err)
 		return nil, err
 	}
 	return &Mailbox{store: ds, name: name, dirName: dir, path: path}, nil
@@ -83,7 +86,7 @@ func (mb *Mailbox) GetMessages() ([]*Message, error) {
 	if err != nil {
 		return nil, err
 	}
-	rev.TRACE.Printf("Scanning %v files for %v", len(files), mb)
+	Trace("Scanning %v files for %v", len(files), mb)
 
 	messages := make([]*Message, 0, len(files))
 	for _, f := range files {
@@ -100,7 +103,7 @@ func (mb *Mailbox) GetMessages() ([]*Message, error) {
 			}
 			file.Close()
 			msg.mailbox = mb
-			rev.TRACE.Printf("Found: %v", msg)
+			Trace("Found: %v", msg)
 			messages = append(messages, msg)
 		}
 	}
@@ -121,7 +124,7 @@ func (mb *Mailbox) GetMessage(id string) (*Message, error) {
 	}
 	file.Close()
 	msg.mailbox = mb
-	rev.TRACE.Printf("Found: %v", msg)
+	Trace("Found: %v", msg)
 
 	return msg, nil
 }
@@ -157,8 +160,8 @@ func (m *Message) gobPath() string {
 }
 
 func (m *Message) rawPath() string {
-	rev.TRACE.Println(m.mailbox.path)
+	Trace(m.mailbox.path)
-	rev.TRACE.Println(m.Id)
+	Trace(m.Id)
 	return filepath.Join(m.mailbox.path, m.Id+".raw")
 }
 

inbucketd/inbucketd.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"github.com/jhillyerd/inbucket"
 	"github.com/jhillyerd/inbucket/smtpd"
+	"log"
 	"os"
 )
 
@@ -26,15 +27,20 @@ func main() {
 		os.Exit(1)
 	}
 	err := inbucket.LoadConfig(flag.Arg(0))
-	configError(err)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to parse config: %v\n", err)
+		os.Exit(1)
+	}
+
+	log.Println("Logger test")
+	inbucket.Trace("trace test")
+	inbucket.Info("info test")
+	inbucket.Warn("warn test")
+	inbucket.Error("error test")
 
 	// Startup SMTP server
-	domain, err := inbucket.Config.String("smtp", "domain")
+	server := smtpd.New()
-	configError(err)
+	server.Start()
-	port, err := inbucket.Config.Int("smtp", "ip4.port")
-	configError(err)
-	server := smtpd.New(domain, port)
-	go server.Start()
 }
 
 func init() {
@@ -43,10 +49,3 @@ func init() {
 		flag.PrintDefaults()
 	}
 }
-
-func configError(err error) {
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error parsing config file: %v\n", err)
-		os.Exit(1)
-	}
-}

logging.go

@@ -0,0 +1,46 @@
+package inbucket
+
+import (
+	"log"
+)
+
+type LogLevel int
+
+const (
+	ERROR LogLevel = iota
+	WARN
+	INFO
+	TRACE
+)
+
+var MaxLogLevel LogLevel = TRACE
+
+// Error logs a message to the 'standard' Logger (always)
+func Error(msg string, args ...interface{}) {
+	msg = "[ERROR] " + msg
+	log.Printf(msg, args...)
+}
+
+// Warn logs a message to the 'standard' Logger if MaxLogLevel is >= WARN
+func Warn(msg string, args ...interface{}) {
+	if MaxLogLevel >= WARN {
+		msg = "[WARN ] " + msg
+		log.Printf(msg, args...)
+	}
+}
+
+// Info logs a message to the 'standard' Logger if MaxLogLevel is >= INFO
+func Info(msg string, args ...interface{}) {
+	if MaxLogLevel >= INFO {
+		msg = "[INFO ] " + msg
+		log.Printf(msg, args...)
+	}
+}
+
+// Trace logs a message to the 'standard' Logger if MaxLogLevel is >= TRACE
+func Trace(msg string, args ...interface{}) {
+	if MaxLogLevel >= TRACE {
+		msg = "[TRACE] " + msg
+		log.Printf(msg, args...)
+	}
+}

smtpd/handler.go

@@ -87,7 +87,7 @@ func (ss *Session) String() string {
  *  5. Goto 2
  */
 func (s *Server) startSession(id int, conn net.Conn) {
-	s.info("Connection from %v, starting session <%v>", conn.RemoteAddr(), id)
+	inbucket.Info("Connection from %v, starting session <%v>", conn.RemoteAddr(), id)
 	defer conn.Close()
 
 	ss := NewSession(s, id, conn)
@@ -476,17 +476,17 @@ func (ss *Session) ooSeq(cmd string) {
 
 // Session specific logging methods
 func (ss *Session) trace(msg string, args ...interface{}) {
-	ss.server.trace("%v<%v> %v", ss.remoteHost, ss.id, fmt.Sprintf(msg, args...))
+	inbucket.Trace("%v<%v> %v", ss.remoteHost, ss.id, fmt.Sprintf(msg, args...))
 }
 
 func (ss *Session) info(msg string, args ...interface{}) {
-	ss.server.info("%v<%v> %v", ss.remoteHost, ss.id, fmt.Sprintf(msg, args...))
+	inbucket.Info("%v<%v> %v", ss.remoteHost, ss.id, fmt.Sprintf(msg, args...))
 }
 
 func (ss *Session) warn(msg string, args ...interface{}) {
-	ss.server.warn("%v<%v> %v", ss.remoteHost, ss.id, fmt.Sprintf(msg, args...))
+	inbucket.Warn("%v<%v> %v", ss.remoteHost, ss.id, fmt.Sprintf(msg, args...))
 }
 
 func (ss *Session) error(msg string, args ...interface{}) {
-	ss.server.error("%v<%v> %v", ss.remoteHost, ss.id, fmt.Sprintf(msg, args...))
+	inbucket.Error("%v<%v> %v", ss.remoteHost, ss.id, fmt.Sprintf(msg, args...))
 }

smtpd/listener.go

@@ -3,14 +3,12 @@ package smtpd
 import (
 	"fmt"
 	"github.com/jhillyerd/inbucket"
-	"github.com/robfig/revel"
 	"net"
 )
 
 // Real server code starts here
 type Server struct {
 	domain          string
-	port            int
 	maxRecips       int
 	maxIdleSeconds  int
 	maxMessageBytes int
@@ -18,39 +16,36 @@ type Server struct {
 }
 
 // Init a new Server object
-func New(domain string, port int) *Server {
+func New() *Server {
 	ds := inbucket.NewDataStore()
-	return &Server{domain: domain, port: port, maxRecips: 100, maxIdleSeconds: 300,
+	// TODO Make more of these configurable
+	return &Server{domain: inbucket.GetSmtpConfig().Domain, maxRecips: 100, maxIdleSeconds: 300,
 		dataStore: ds, maxMessageBytes: 2048000}
 }
 
-// Loggers
-func (s *Server) trace(msg string, args ...interface{}) {
-	rev.TRACE.Printf(msg, args...)
-}
-
-func (s *Server) info(msg string, args ...interface{}) {
-	rev.INFO.Printf(msg, args...)
-}
-
-func (s *Server) warn(msg string, args ...interface{}) {
-	rev.WARN.Printf(msg, args...)
-}
-
-func (s *Server) error(msg string, args ...interface{}) {
-	rev.ERROR.Printf(msg, args...)
-}
-
 // Main listener loop
 func (s *Server) Start() {
-	s.trace("Server Start() called")
+	cfg := inbucket.GetSmtpConfig()
-	ln, err := net.Listen("tcp", fmt.Sprintf(":%v", s.port))
+	addr, err := net.ResolveTCPAddr("tcp4", fmt.Sprintf("%v:%v",
+		cfg.Ip4address, cfg.Ip4port))
 	if err != nil {
+		inbucket.Error("Failed to build tcp4 address: %v", err)
+		// TODO More graceful early-shutdown procedure
+		panic(err)
+	}
+
+	inbucket.Info("Listening on TCP4 %v", addr)
+	ln, err := net.ListenTCP("tcp4", addr)
+	if err != nil {
+		inbucket.Error("Failed to start tcp4 listener: %v", err)
+		// TODO More graceful early-shutdown procedure
 		panic(err)
 	}
 
 	for sid := 1; ; sid++ {
 		if conn, err := ln.Accept(); err != nil {
+			// TODO Implement a max error counter before shutdown?
+			// or maybe attempt to restart smtpd
 			panic(err)
 		} else {
 			go s.startSession(sid, conn)