Make watcher scan all directories for client, start adding user

management to server with socket communication via admin binary

client/asink.go

@@ -121,7 +121,7 @@ func ProcessLocalEvent(globals AsinkGlobals, event *asink.Event) {
 		if err != nil {
 			//bail out if the file we are trying to upload already got deleted
 			if util.ErrorFileNotFound(err) {
-				event.Status |= asink.DISCARDED
+				event.LocalStatus |= asink.DISCARDED
 				return
 			}
 			panic(err)
@@ -132,7 +132,7 @@ func ProcessLocalEvent(globals AsinkGlobals, event *asink.Event) {
 		if err != nil {
 			//bail out if the file we are trying to upload already got deleted
 			if util.ErrorFileNotFound(err) {
-				event.Status |= asink.DISCARDED
+				event.LocalStatus |= asink.DISCARDED
 				return
 			}
 			panic(err)
@@ -150,7 +150,7 @@ func ProcessLocalEvent(globals AsinkGlobals, event *asink.Event) {
 		//If the file didn't actually change, squash this event
 		if latestLocal != nil && event.Hash == latestLocal.Hash {
 			os.Remove(tmpfilename)
-			event.Status |= asink.DISCARDED
+			event.LocalStatus |= asink.DISCARDED
 			return
 		}
 
@@ -173,7 +173,7 @@ func ProcessLocalEvent(globals AsinkGlobals, event *asink.Event) {
 	} else {
 		//if we're trying to delete a file that we thought was already deleted, there's no need to delete it again
 		if latestLocal != nil && latestLocal.IsDelete() {
-			event.Status |= asink.DISCARDED
+			event.LocalStatus |= asink.DISCARDED
 			return
 		}
 	}
@@ -195,13 +195,15 @@ func ProcessRemoteEvent(globals AsinkGlobals, event *asink.Event) {
 	//if we already have this event, or if it is older than our most recent event, bail out
 	if latestLocal != nil {
 		if event.Timestamp < latestLocal.Timestamp || event.IsSameEvent(latestLocal) {
-			event.Status |= asink.DISCARDED
+			event.LocalStatus |= asink.DISCARDED
 			return
 		}
 
 		if latestLocal.Hash != event.Predecessor && latestLocal.Hash != event.Hash {
-			panic("conflict")
-			//TODO handle conflict
+			fmt.Printf("conflict:\n")
+			fmt.Printf("OLD %+v\n", latestLocal)
+			fmt.Printf("NEW %+v\n", event)
+			//TODO handle conflict?
 		}
 	}
 

client/database.go

@@ -37,7 +37,7 @@ func GetAndInitDB(config *conf.ConfigFile) (*AsinkDB, error) {
 	}
 	if !rows.Next() {
 		//if this is false, it means no rows were returned
-		tx.Exec("CREATE TABLE events (id INTEGER, localid INTEGER PRIMARY KEY ASC, type INTEGER, status INTEGER, path TEXT, hash TEXT, predecessor TEXT, timestamp INTEGER, permissions INTEGER);")
+		tx.Exec("CREATE TABLE events (id INTEGER, localid INTEGER PRIMARY KEY ASC, type INTEGER, localstatus INTEGER, path TEXT, hash TEXT, predecessor TEXT, timestamp INTEGER, permissions INTEGER);")
 		//		tx.Exec("CREATE INDEX IF NOT EXISTS localididx on events (localid)")
 		tx.Exec("CREATE INDEX IF NOT EXISTS ididx on events (id);")
 		tx.Exec("CREATE INDEX IF NOT EXISTS pathidx on events (path);")
@@ -66,7 +66,7 @@ func (adb *AsinkDB) DatabaseAddEvent(e *asink.Event) (err error) {
 		adb.lock.Unlock()
 	}()
 
-	result, err := tx.Exec("INSERT INTO events (id, type, status, path, hash, predecessor, timestamp, permissions) VALUES (?,?,?,?,?,?,?,?);", e.Id, e.Type, e.Status, e.Path, e.Hash, e.Predecessor, e.Timestamp, e.Permissions)
+	result, err := tx.Exec("INSERT INTO events (id, type, localstatus, path, hash, predecessor, timestamp, permissions) VALUES (?,?,?,?,?,?,?,?);", e.Id, e.Type, e.LocalStatus, e.Path, e.Hash, e.Predecessor, e.Timestamp, e.Permissions)
 	if err != nil {
 		return err
 	}
@@ -102,7 +102,7 @@ func (adb *AsinkDB) DatabaseUpdateEvent(e *asink.Event) (err error) {
 		adb.lock.Unlock()
 	}()
 
-	result, err := tx.Exec("UPDATE events SET id=?, type=?, status=?, path=?, hash=?, prececessor=?, timestamp=?, permissions=? WHERE localid=?;", e.Id, e.Type, e.Status, e.Path, e.Hash, e.Predecessor, e.Timestamp, e.Permissions, e.LocalId)
+	result, err := tx.Exec("UPDATE events SET id=?, type=?, localstatus=?, path=?, hash=?, prececessor=?, timestamp=?, permissions=? WHERE localid=?;", e.Id, e.Type, e.LocalStatus, e.Path, e.Hash, e.Predecessor, e.Timestamp, e.Permissions, e.LocalId)
 	if err != nil {
 		return err
 	}
@@ -127,10 +127,10 @@ func (adb *AsinkDB) DatabaseLatestEventForPath(path string) (event *asink.Event,
 	//make sure the database gets unlocked
 	defer adb.lock.Unlock()
 
-	row := adb.db.QueryRow("SELECT id, localid, type, status, path, hash, predecessor, timestamp, permissions FROM events WHERE path == ? ORDER BY timestamp DESC LIMIT 1;", path)
+	row := adb.db.QueryRow("SELECT id, localid, type, localstatus, path, hash, predecessor, timestamp, permissions FROM events WHERE path == ? ORDER BY timestamp DESC LIMIT 1;", path)
 
 	event = new(asink.Event)
-	err = row.Scan(&event.Id, &event.LocalId, &event.Type, &event.Status, &event.Path, &event.Hash, &event.Predecessor, &event.Timestamp, &event.Permissions)
+	err = row.Scan(&event.Id, &event.LocalId, &event.Type, &event.LocalStatus, &event.Path, &event.Hash, &event.Predecessor, &event.Timestamp, &event.Permissions)
 
 	switch {
 	case err == sql.ErrNoRows:
@@ -148,10 +148,10 @@ func (adb *AsinkDB) DatabaseLatestRemoteEvent() (event *asink.Event, err error)
 	//make sure the database gets unlocked
 	defer adb.lock.Unlock()
 
-	row := adb.db.QueryRow("SELECT id, localid, type, status, path, hash, predecessor, timestamp, permissions FROM events WHERE id > 0 ORDER BY id DESC LIMIT 1;")
+	row := adb.db.QueryRow("SELECT id, localid, type, localstatus, path, hash, predecessor, timestamp, permissions FROM events WHERE id > 0 ORDER BY id DESC LIMIT 1;")
 
 	event = new(asink.Event)
-	err = row.Scan(&event.Id, &event.LocalId, &event.Type, &event.Status, &event.Path, &event.Hash, &event.Predecessor, &event.Timestamp, &event.Permissions)
+	err = row.Scan(&event.Id, &event.LocalId, &event.Type, &event.LocalStatus, &event.Path, &event.Hash, &event.Predecessor, &event.Timestamp, &event.Permissions)
 
 	switch {
 	case err == sql.ErrNoRows:

client/path_map.go

@@ -33,7 +33,7 @@ func PathLocker(db *AsinkDB) {
 		case event = <-pathUnlockerChan:
 			if v, ok = m[event.Path]; ok != false {
 				//only update status in data structures if the event hasn't been discarded
-				if event.Status&asink.DISCARDED == 0 {
+				if event.LocalStatus&asink.DISCARDED == 0 {
 					if v.latestEvent == nil || !v.latestEvent.IsSameEvent(event) {
 						err := db.DatabaseAddEvent(event)
 						if err != nil {

client/watcher.go

@@ -21,6 +21,12 @@ func StartWatching(watchDir string, fileUpdates chan *asink.Event) {
 			if err != nil {
 				panic("Failed to watch " + path)
 			}
+		} else if info.Mode().IsRegular() {
+			event := new(asink.Event)
+			event.Path = path
+			event.Type = asink.UPDATE
+			event.Timestamp = info.ModTime().UnixNano()
+			fileUpdates <- event
 		}
 		return nil
 	}

events.go

@@ -17,20 +17,22 @@ type EventStatus uint32
 
 const (
 	//Local event status flags
-	DISCARDED       = 1 << iota //event is to be discarded because it errored or is duplicate
+	DISCARDED = 1 << iota //event is to be discarded because it errored or is duplicate
 )
 
 type Event struct {
 	Id          int64
-	LocalId     int64
 	Type        EventType
-	Status      EventStatus
 	Path        string
 	Hash        string
 	Predecessor string
 	Timestamp   int64
 	Permissions os.FileMode
-	InDB        bool `json:"-"` //defaults to false. Omitted from json marshalling.
+	Username    string
+	Sharename   string
+	LocalStatus EventStatus `json:"-"`
+	LocalId     int64       `json:"-"`
+	InDB        bool        `json:"-"` //defaults to false. Omitted from json marshalling.
 }
 
 func (e *Event) IsUpdate() bool {

server/admin/admin.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+type AdminCommand struct {
+	cmd         string
+	fn          func(args []string)
+	explanation string
+}
+
+var commands []AdminCommand = []AdminCommand{
+	AdminCommand{
+		cmd:         "useradd",
+		fn:          UserAdd,
+		explanation: "Add a user",
+	},
+	AdminCommand{
+		cmd:         "userdel",
+		fn:          UserDel,
+		explanation: "Remove a user",
+	},
+	AdminCommand{
+		cmd:         "usermod",
+		fn:          UserMod,
+		explanation: "Modify a user",
+	},
+}
+
+func main() {
+	if len(os.Args) > 1 {
+		cmd := os.Args[1]
+		for _, c := range commands {
+			if c.cmd == cmd {
+				c.fn(os.Args[2:])
+				return
+			}
+		}
+		fmt.Println("Invalid subcommand specified, please pick from the following:")
+	} else {
+		fmt.Println("No subcommand specified, please pick one from the following:")
+	}
+	for _, c := range commands {
+		fmt.Printf("\t%s\t\t%s\n", c.cmd, c.explanation)
+	}
+}

server/admin/rpc.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"net"
+	"net/rpc"
+	"log"
+	"syscall"
+)
+
+func RPCCall(method string, args interface{}, reply interface{}) error {
+	socket := "/tmp/asink.sock"
+	client, err := rpc.DialHTTP("unix", socket)
+	if err != nil {
+		if err2, ok := err.(*net.OpError); ok {
+			if err2.Err == syscall.ENOENT {
+				log.Fatal("The socket ("+socket+") was not found")
+			} else if err2.Err == syscall.ECONNREFUSED {
+				log.Fatal("A connection was refused to "+socket+". Please check the permissions and ensure the server is running.")
+			}
+		}
+		return err
+	}
+	defer client.Close()
+
+	err = client.Call(method, args, reply)
+	return err
+}

server/admin/users.go

@@ -0,0 +1,153 @@
+package main
+
+import (
+	"asink/server"
+	"code.google.com/p/gopass"
+	"flag"
+	"fmt"
+	"os"
+	"strconv"
+	"reflect"
+)
+
+type boolIsSetFlag struct {
+	Value bool
+	IsSet bool //true if explicitly set from the command-line, false otherwise
+}
+
+func newBoolIsSetFlag(defaultValue bool) *boolIsSetFlag {
+	b := new(boolIsSetFlag)
+	b.Value = defaultValue
+	return b
+}
+
+func (b *boolIsSetFlag) Set(value string) error {
+	v, err := strconv.ParseBool(value)
+	b.Value = v
+	b.IsSet = true
+	return err
+}
+
+func (b *boolIsSetFlag) String() string { return fmt.Sprintf("%v", *b) }
+
+func (b *boolIsSetFlag) IsBoolFlag() bool { return true }
+
+func UserAdd(args []string) {
+	flags := flag.NewFlagSet("useradd", flag.ExitOnError)
+	admin := flags.Bool("admin", false, "User should be an administrator")
+	flags.Parse(args)
+
+	if flags.NArg() != 1 {
+		fmt.Println("Error: please supply a username (and only one)")
+		os.Exit(1)
+	}
+
+	passwordOne, err := gopass.GetPass("Enter password for new user: ")
+	if err != nil {
+		panic(err)
+	}
+	passwordTwo, err := gopass.GetPass("Enter the same password again: ")
+	if err != nil {
+		panic(err)
+	}
+
+	if passwordOne != passwordTwo {
+		fmt.Println("Error: Passwords do not match. Please try again.")
+		os.Exit(1)
+	}
+
+	user := new(server.User)
+
+	if *admin {
+		user.Role = server.ADMIN
+	} else {
+		user.Role = server.NORMAL
+	}
+	user.Username = flags.Arg(0)
+	user.PWHash = server.HashPassword(passwordOne)
+
+	fmt.Println(user)
+	i := 99
+	err = RPCCall("UserModifier.AddUser", user, &i)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func UserDel(args []string) {
+	if len(args) != 1 {
+		fmt.Println("Error: please supply a username (and only one)")
+		os.Exit(1)
+	}
+
+	user := new(server.User)
+	user.Username = args[0]
+
+	fmt.Println(user)
+	i := 99
+	err := RPCCall("UserModifier.RemoveUser", user, &i)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func UserMod(args []string) {
+	rpcargs := new(server.UserModifierArgs)
+	rpcargs.Current = new(server.User)
+	rpcargs.Updated = new(server.User)
+
+	admin := newBoolIsSetFlag(false)
+
+	flags := flag.NewFlagSet("usermod", flag.ExitOnError)
+	flags.Var(admin, "admin", "User should be an administrator")
+	flags.BoolVar(&rpcargs.UpdatePassword, "password", false, "Change the user's password")
+	flags.BoolVar(&rpcargs.UpdatePassword, "p", false, "Change the user's password (short version)")
+	flags.BoolVar(&rpcargs.UpdateLogin, "login", false, "Change the user's username")
+	flags.BoolVar(&rpcargs.UpdateLogin, "l", false, "Change the user's username (short version)")
+	flags.Parse(args)
+
+	//set the UpdateAdmin flag based on whether it was present on the command-line
+
+	if flags.NArg() != 1 {
+		fmt.Println("Error: please supply a username (and only one)")
+		os.Exit(1)
+	}
+	rpcargs.Current.Username = flags.Arg(0)
+
+	if rpcargs.UpdateLogin == true {
+		fmt.Print("New login: ")
+		fmt.Scanf("%s", &rpcargs.Updated.Username)
+	}
+
+	if rpcargs.UpdatePassword {
+		passwordOne, err := gopass.GetPass("Enter new password for user: ")
+		if err != nil {
+			panic(err)
+		}
+		passwordTwo, err := gopass.GetPass("Enter the same password again: ")
+		if err != nil {
+			panic(err)
+		}
+
+		if passwordOne != passwordTwo {
+			fmt.Println("Error: Passwords do not match. Please try again.")
+			os.Exit(1)
+		}
+		rpcargs.Updated.PWHash = server.HashPassword(passwordOne)
+	}
+
+	rpcargs.UpdateRole = admin.IsSet
+	if admin.Value {
+		rpcargs.Updated.Role = server.ADMIN
+	} else {
+		rpcargs.Updated.Role = server.NORMAL
+	}
+
+	fmt.Println(rpcargs)
+	i := 99
+	err := RPCCall("UserModifier.ModifyUser", rpcargs, &i)
+	if err != nil {
+		fmt.Println(reflect.TypeOf(err))
+		panic(err)
+	}
+}

server/admin_rpc.go

@@ -0,0 +1,58 @@
+package server
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"net/rpc"
+)
+
+type UserModifier int
+
+type UserModifierArgs struct {
+	Current        *User
+	Updated        *User
+	UpdateLogin    bool
+	UpdateRole     bool
+	UpdatePassword bool
+}
+
+func (u *UserModifier) AddUser(user *User, result *int) error {
+	fmt.Println("adding user: ", user)
+	ret := 0
+	result = &ret
+	return nil
+}
+
+func (u *UserModifier) ModifyUser(args *UserModifierArgs, result *int) error {
+	fmt.Println("modifying user: ", args)
+	fmt.Println("from: ", args.Current)
+	fmt.Println("to: ", args.Updated)
+	ret := 0
+	result = &ret
+	return nil
+}
+
+func (u *UserModifier) RemoveUser(user *User, result *int) error {
+	fmt.Println("removing user: ", user)
+	ret := 0
+	result = &ret
+	return nil
+}
+
+func StartRPC(townDown chan int) {
+	defer func() { townDown <- 0 }() //the main thread waits for this to ensure the socket is closed
+
+	usermod := new(UserModifier)
+	rpc.Register(usermod)
+	rpc.HandleHTTP()
+	l, err := net.Listen("unix", "/tmp/asink.sock")
+	if err != nil {
+		panic(err)
+	}
+	defer l.Close()
+
+	go http.Serve(l, nil)
+
+	WaitOnExit()
+}

server/database.go

@@ -1,100 +0,0 @@
-package main
-
-import (
-	"asink"
-	"database/sql"
-	_ "github.com/mattn/go-sqlite3"
-	"sync"
-)
-
-type AsinkDB struct {
-	db   *sql.DB
-	lock sync.Mutex
-}
-
-func GetAndInitDB() (*AsinkDB, error) {
-	dbLocation := "asink-server.db" //TODO make me configurable
-
-	db, err := sql.Open("sqlite3", "file:"+dbLocation+"?cache=shared&mode=rwc")
-	if err != nil {
-		return nil, err
-	}
-
-	//make sure the events table is created
-	tx, err := db.Begin()
-	if err != nil {
-		return nil, err
-	}
-	rows, err := tx.Query("SELECT name FROM sqlite_master WHERE type='table' AND name='events';")
-	if err != nil {
-		return nil, err
-	}
-	if !rows.Next() {
-		//if this is false, it means no rows were returned
-		tx.Exec("CREATE TABLE events (id INTEGER PRIMARY KEY ASC, localid INTEGER, type INTEGER, status INTEGER, path TEXT, hash TEXT, predecessor TEXT, timestamp INTEGER, permissions INTEGER);")
-		tx.Exec("CREATE INDEX IF NOT EXISTS pathidx on events (path);")
-	}
-	err = tx.Commit()
-	if err != nil {
-		return nil, err
-	}
-
-	ret := new(AsinkDB)
-	ret.db = db
-	return ret, nil
-}
-
-func (adb *AsinkDB) DatabaseAddEvent(e *asink.Event) (err error) {
-	adb.lock.Lock()
-	tx, err := adb.db.Begin()
-	if err != nil {
-		return err
-	}
-
-	//make sure the transaction gets rolled back on error, and the database gets unlocked
-	defer func() {
-		if err != nil {
-			tx.Rollback()
-		}
-		adb.lock.Unlock()
-	}()
-
-	result, err := tx.Exec("INSERT INTO events (localid, type, status, path, hash, predecessor, timestamp, permissions) VALUES (?,?,?,?,?,?,?,?);", e.LocalId, e.Type, e.Status, e.Path, e.Hash, e.Predecessor, e.Timestamp, e.Permissions)
-	if err != nil {
-		return err
-	}
-	id, err := result.LastInsertId()
-	if err != nil {
-		return err
-	}
-	err = tx.Commit()
-	if err != nil {
-		return err
-	}
-
-	e.Id = id
-	e.InDB = true
-	return nil
-}
-
-func (adb *AsinkDB) DatabaseRetrieveEvents(firstId uint64, maxEvents uint) (events []*asink.Event, err error) {
-	adb.lock.Lock()
-	//make sure the database gets unlocked on return
-	defer func() {
-		adb.lock.Unlock()
-	}()
-	rows, err := adb.db.Query("SELECT id, localid, type, status, path, hash, predecessor, timestamp, permissions FROM events WHERE id >= ? ORDER BY id ASC LIMIT ?;", firstId, maxEvents)
-	if err != nil {
-		return nil, err
-	}
-	for rows.Next() {
-		var event asink.Event
-		err = rows.Scan(&event.Id, &event.LocalId, &event.Type, &event.Status, &event.Path, &event.Hash, &event.Predecessor, &event.Timestamp, &event.Permissions)
-		if err != nil {
-			return nil, err
-		}
-		events = append(events, &event)
-	}
-
-	return events, nil
-}

server/exit.go

@@ -0,0 +1,43 @@
+package server
+
+import (
+	"os"
+	"os/signal"
+	"sync/atomic"
+)
+
+var exitWaiterCount int32
+var exitCalled chan int
+var exitWaiterChan chan int
+
+func init() {
+	exitWaiterCount = 0
+	exitWaiterChan = make(chan int)
+	go setupCleanExitOnSignals()
+}
+
+func setupCleanExitOnSignals() {
+	//wait to properly close the socket when we're exiting
+	exitCode := 0
+	sig := make(chan os.Signal, 1)
+	signal.Notify(sig, os.Interrupt)
+	defer signal.Stop(sig)
+
+	select {
+	case <-sig:
+	case exitCode = <-exitCalled:
+	}
+
+	for c := atomic.AddInt32(&exitWaiterCount, -1); c >= 0; c = atomic.AddInt32(&exitWaiterCount, -1) {
+		exitWaiterChan <- exitCode
+	}
+}
+
+func Exit(exitCode int) {
+	exitCalled <- exitCode
+}
+
+func WaitOnExit() int {
+	atomic.AddInt32(&exitWaiterCount, 1)
+	return <-exitWaiterChan
+}

server/server/database.go

@@ -0,0 +1,171 @@
+package main
+
+import (
+	"asink"
+	"asink/server"
+	"database/sql"
+	_ "github.com/mattn/go-sqlite3"
+	"sync"
+)
+
+type AsinkDB struct {
+	db   *sql.DB
+	lock sync.Mutex
+}
+
+func GetAndInitDB() (*AsinkDB, error) {
+	dbLocation := "asink-server.db" //TODO make me configurable
+
+	db, err := sql.Open("sqlite3", "file:"+dbLocation+"?cache=shared&mode=rwc")
+	if err != nil {
+		return nil, err
+	}
+
+	//make sure all the tables are created
+	tx, err := db.Begin()
+	if err != nil {
+		return nil, err
+	}
+
+	rows, err := tx.Query("SELECT name FROM sqlite_master WHERE type='table' AND name='events';")
+	if err != nil {
+		return nil, err
+	}
+	if !rows.Next() {
+		//if this is false, it means no rows were returned
+		tx.Exec("CREATE TABLE events (id INTEGER PRIMARY KEY ASC, userid INTEGER, type INTEGER, path TEXT, hash TEXT, predecessor TEXT, timestamp INTEGER, permissions INTEGER);")
+		tx.Exec("CREATE INDEX IF NOT EXISTS pathidx on events (path);")
+		tx.Exec("CREATE INDEX IF NOT EXISTS timestampidx on events (timestamp);")
+	} else {
+		rows.Close()
+	}
+
+	rows, err = tx.Query("SELECT name FROM sqlite_master WHERE type='table' AND name='users';")
+	if err != nil {
+		return nil, err
+	}
+	if !rows.Next() {
+		//if this is false, it means no rows were returned
+		tx.Exec("CREATE TABLE user (id INTEGER PRIMARY KEY ASC, username TEXT, pwhash TEXT, role INTEGER);")
+	} else {
+		rows.Close()
+	}
+
+	err = tx.Commit()
+	if err != nil {
+		return nil, err
+	}
+
+	ret := new(AsinkDB)
+	ret.db = db
+	return ret, nil
+}
+
+func (adb *AsinkDB) DatabaseAddEvent(e *asink.Event) (err error) {
+	adb.lock.Lock()
+	tx, err := adb.db.Begin()
+	if err != nil {
+		return err
+	}
+
+	//make sure the transaction gets rolled back on error, and the database gets unlocked
+	defer func() {
+		if err != nil {
+			tx.Rollback()
+		}
+		adb.lock.Unlock()
+	}()
+
+	result, err := tx.Exec("INSERT INTO events (userid, type, path, hash, predecessor, timestamp, permissions) VALUES (?,?,?,?,?,?,?,?);", e.Type, e.Path, e.Hash, e.Predecessor, e.Timestamp, e.Permissions)
+	if err != nil {
+		return err
+	}
+	id, err := result.LastInsertId()
+	if err != nil {
+		return err
+	}
+	err = tx.Commit()
+	if err != nil {
+		return err
+	}
+
+	e.Id = id
+	e.InDB = true
+	return nil
+}
+
+func (adb *AsinkDB) DatabaseRetrieveEvents(firstId uint64, maxEvents uint) (events []*asink.Event, err error) {
+	adb.lock.Lock()
+	//make sure the database gets unlocked on return
+	defer func() {
+		adb.lock.Unlock()
+	}()
+	rows, err := adb.db.Query("SELECT id, type, path, hash, predecessor, timestamp, permissions FROM events WHERE id >= ? ORDER BY id ASC LIMIT ?;", firstId, maxEvents)
+	if err != nil {
+		return nil, err
+	}
+	for rows.Next() {
+		var event asink.Event
+		err = rows.Scan(&event.Id, &event.Type, &event.Path, &event.Hash, &event.Predecessor, &event.Timestamp, &event.Permissions)
+		if err != nil {
+			return nil, err
+		}
+		events = append(events, &event)
+	}
+
+	return events, nil
+}
+
+func (adb *AsinkDB) DatabaseAddUser(u *server.User) (err error) {
+	adb.lock.Lock()
+	tx, err := adb.db.Begin()
+	if err != nil {
+		return err
+	}
+
+	//make sure the transaction gets rolled back on error, and the database gets unlocked
+	defer func() {
+		if err != nil {
+			tx.Rollback()
+		}
+		adb.lock.Unlock()
+	}()
+
+	result, err := tx.Exec("INSERT INTO users (username, pwhash, role) VALUES (?,?);", u.Username, u.PWHash, u.Role)
+	if err != nil {
+		return err
+	}
+	id, err := result.LastInsertId()
+	if err != nil {
+		return err
+	}
+	err = tx.Commit()
+	if err != nil {
+		return err
+	}
+
+	u.Id = id
+	return nil
+}
+
+func (adb *AsinkDB) DatabaseGetUser(username string) (user *server.User, err error) {
+	adb.lock.Lock()
+	//make sure the database gets unlocked
+	defer adb.lock.Unlock()
+
+	row := adb.db.QueryRow("SELECT id, username, pwhash, role FROM users WHERE username == ?;", username)
+
+	user = new(server.User)
+	err = row.Scan(&user.Id, &user.Username, &user.PWHash, &user.Role)
+
+	switch {
+	case err == sql.ErrNoRows:
+		return nil, nil
+	case err != nil:
+		return nil, err
+	default:
+		return user, nil
+	}
+}
+
+

server/server/server.go

@@ -2,13 +2,17 @@ package main
 
 import (
 	"asink"
+	"asink/server"
+	"encoding/base64"
 	"encoding/json"
 	"flag"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"net/http"
 	"regexp"
 	"strconv"
+	"strings"
 )
 
 //global variables
@@ -34,15 +38,24 @@ func init() {
 func main() {
 	flag.Parse()
 
+	rpcTornDown := make(chan int)
+	go server.StartRPC(rpcTornDown)
+
 	http.HandleFunc("/", rootHandler)
 	http.HandleFunc("/events", eventHandler)
 	http.HandleFunc("/events/", eventHandler)
 
-	//TODO replace with http://golang.org/pkg/net/http/#ListenAndServeTLS
-	err := http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
+	//TODO add HTTPS, something like http://golang.org/pkg/net/http/#ListenAndServeTLS
+	l, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
 	if err != nil {
-		fmt.Println(err)
+		panic(err)
 	}
+	defer l.Close()
+	go http.Serve(l, nil)
+	//TODO handle errors from http.Serve?
+
+	server.WaitOnExit()
+	<-rpcTornDown
 }
 
 func rootHandler(w http.ResponseWriter, r *http.Request) {
@@ -139,6 +152,19 @@ func putEvents(w http.ResponseWriter, r *http.Request) {
 }
 
 func eventHandler(w http.ResponseWriter, r *http.Request) {
+	user := AuthenticateUser(r)
+	if user == nil {
+		apiresponse := asink.APIResponse{
+			Status:      asink.ERROR,
+			Explanation: "This operation requires user authentication",
+		}
+		b, err := json.Marshal(apiresponse)
+		if err != nil {
+			b = []byte(err.Error())
+		}
+		w.Write(b)
+		return
+	}
 	if r.Method == "GET" {
 		//if GET, return any events later than (and including) the event id passed in
 		if sm := eventsRegexp.FindStringSubmatch(r.RequestURI); sm != nil {
@@ -164,3 +190,34 @@ func eventHandler(w http.ResponseWriter, r *http.Request) {
 		w.Write(b)
 	}
 }
+
+func AuthenticateUser(r *http.Request) (user *server.User) {
+	h, ok := r.Header["Authorization"]
+	if !ok {
+		return nil
+	}
+	authparts := strings.Split(h[0], " ")
+	if len(authparts) != 2 || authparts[0] != "Basic" {
+		return nil
+	}
+
+	userpass, err := base64.StdEncoding.DecodeString(authparts[1])
+	if err != nil {
+		return nil
+	}
+	splituserpass := strings.Split(string(userpass), ":")
+	if len(splituserpass) != 2 {
+		return nil
+	}
+
+	user, err = adb.DatabaseGetUser(splituserpass[0])
+	if err != nil || user == nil {
+		return nil
+	}
+
+	if user.ValidPassword(splituserpass[1]) {
+		return user
+	} else {
+		return nil
+	}
+}

server/users.go

@@ -0,0 +1,35 @@
+package server
+
+import (
+	"crypto/sha256"
+	"fmt"
+)
+
+type UserRole uint32
+
+const (
+	//User roles
+	ADMIN = 1 << iota
+	NORMAL
+)
+
+type User struct {
+	Id       int64
+	Username string
+	PWHash   string
+	Role     UserRole
+}
+
+func HashPassword(pw string) string {
+	hashfn := sha256.New()
+	hashfn.Write([]byte(pw))
+	return fmt.Sprintf("%x", hashfn.Sum(nil))
+}
+
+func (u *User) ValidPassword(pw string) bool {
+	return HashPassword(pw) == u.PWHash
+}
+
+func (u *User) IsAdmin() bool {
+	return u.Role&ADMIN == ADMIN
+}