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main.go
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main.go
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package main
import (
"database/sql"
"encoding/json"
"github.com/Sirupsen/logrus"
_ "github.com/mattn/go-sqlite3"
"golang.org/x/net/context"
"io"
"io/ioutil"
"zenhack.net/go/irc-idler/internal/netextra"
"zenhack.net/go/irc-idler/irc"
"zenhack.net/go/irc-idler/proxy"
"zenhack.net/go/irc-idler/sandstorm/webui"
sqlstore "zenhack.net/go/irc-idler/storage/sql"
grain_capnp "zenhack.net/go/sandstorm/capnp/grain"
ip_capnp "zenhack.net/go/sandstorm/capnp/ip"
"zenhack.net/go/sandstorm/grain"
"zenhack.net/go/sandstorm/ip"
"zenhack.net/go/sandstorm/websession"
"zombiezen.com/go/capnproto2"
)
const (
ipNetworkCapFile = "/var/ipNetworkCap"
serverConfigFile = "/var/server-config.json"
databaseFile = "/var/irc-idler.sqlite"
)
var (
db *sql.DB
)
func saveServerConfig(cfg webui.ServerConfig) error {
buf, err := json.Marshal(cfg)
if err != nil {
return err
}
return ioutil.WriteFile(serverConfigFile, buf, 0600)
}
func loadServerConfig() (webui.ServerConfig, error) {
ret := webui.ServerConfig{}
buf, err := ioutil.ReadFile(serverConfigFile)
if err != nil {
return ret, err
}
err = json.Unmarshal(buf, &ret)
if err != nil {
// Make sure we return the zero value on failure:
return webui.ServerConfig{}, err
}
return ret, nil
}
func saveIpNetwork(ctx context.Context, api grain_capnp.SandstormApi, ipNetworkCap capnp.Pointer) error {
results, err := api.Save(
ctx,
func(p grain_capnp.SandstormApi_save_Params) error {
p.SetCap(ipNetworkCap)
// TODO: set Label
return nil
},
).Struct()
if err != nil {
return err
}
token, err := results.Token()
if err != nil {
return err
}
return ioutil.WriteFile(ipNetworkCapFile, token, 0600)
}
func loadIpNetwork(ctx context.Context, api grain_capnp.SandstormApi) (*ip_capnp.IpNetwork, error) {
token, err := ioutil.ReadFile(ipNetworkCapFile)
if err != nil {
return nil, err
}
capability, err := api.Restore(ctx,
func(p grain_capnp.SandstormApi_restore_Params) error {
p.SetToken(token)
return nil
}).Cap().Struct()
if err != nil {
return nil, err
}
return &ip_capnp.IpNetwork{capnp.ToInterface(capability).Client()}, nil
}
func main() {
logger := logrus.New()
logger.Level = logrus.DebugLevel
backend := &webui.Backend{
IpNetworkCaps: make(chan capnp.Pointer),
GetServerConfig: make(chan webui.ServerConfig),
SetServerConfig: make(chan webui.ServerConfig),
HaveNetwork: make(chan bool),
ClientConns: make(chan io.ReadWriteCloser),
}
var (
serverConfig webui.ServerConfig
daemon *proxy.Proxy
daemonClientConns chan irc.ReadWriteCloser
ipNetwork *ip_capnp.IpNetwork
err error
)
ctx := context.Background()
handler, err := webui.NewHandler(ctx, backend)
if err != nil {
logger.Fatalln("Error: ", err)
}
api, err := grain.ConnectAPI(ctx,
grain_capnp.UiView_ServerToClient(websession.FromHandler(handler)),
)
if err != nil {
logger.Fatalln("Error: ", err)
}
logger.Debugln("Got API: ", api)
logger.Debugln("Going to try to stay awake...")
api.StayAwake(ctx, nil).Handle()
logger.Debugln("Got the wake lock.")
/*
// TODO: it would be nice if we could just restore the capability, but
// We're having an issue where the capability seems to load fine, but doesn't
// actually work. I'm not sure ipNetwork is even actually persistent; need
// to investigate this further.
ipNetwork, err = loadIpNetwork(ctx, api)
if err != nil {
logger.Infoln("Failed to load ipNetwork capability:", err)
}
*/
db, err = sql.Open("sqlite3", databaseFile)
if err != nil {
logger.Fatalln("Failed to open database:", err)
}
if err = db.Ping(); err != nil {
logger.Fatalln("Failed to open database:", err)
}
store := sqlstore.NewStore(db)
serverConfig, err = loadServerConfig()
if err != nil {
logger.Infoln("Failed to load server config:", err)
}
// Stop the running proxy daemon (if any) and start a new one.
newDaemon := func() {
if daemon != nil {
logger.Debugln("Stopping daemon")
daemon.Stop()
daemon = nil
}
daemonClientConns = make(chan irc.ReadWriteCloser)
var dialer netextra.Dialer
dialer = &ip.IpNetworkDialer{ctx, *ipNetwork}
if serverConfig.TLS {
dialer = &netextra.TLSDialer{dialer}
}
daemon = proxy.NewProxy(
logger,
store,
daemonClientConns,
&proxy.DialerConnector{
Dialer: dialer,
Network: "tcp",
Addr: serverConfig.String(),
},
)
go daemon.Run()
}
if serverConfig.Port != 0 && ipNetwork != nil {
newDaemon()
}
for {
select {
case ipNetworkCap := <-backend.IpNetworkCaps:
logger.Debugln("got ipNetwork cap: ", ipNetworkCap)
if err := saveIpNetwork(ctx, api, ipNetworkCap); err != nil {
logger.Warnln("Failed to save ipNetwork capability:", err)
}
ipNetwork = &ip_capnp.IpNetwork{capnp.ToInterface(ipNetworkCap).Client()}
if serverConfig.Port != 0 {
newDaemon()
}
case serverConfig = <-backend.SetServerConfig:
logger.Debugln("got server config: ", serverConfig)
err = saveServerConfig(serverConfig)
if err != nil {
logger.Warnln("Failed to save server config:", err)
}
if ipNetwork != nil {
newDaemon()
}
case conn := <-backend.ClientConns:
if daemon == nil {
// The daemon isn't running, probably because we don't have
// a network capability; we can't connect to the server.
// TODO: give the client some useful error message.
logger.Debugln("Got client connection, but daemon isn't running")
conn.Close()
} else {
logger.Debugln("Sending client connection to daemon.")
daemonClientConns <- irc.NewReadWriteCloser(conn)
}
case backend.GetServerConfig <- serverConfig:
case backend.HaveNetwork <- ipNetwork != nil:
}
}
}