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142 lines
3.3 KiB
Go
142 lines
3.3 KiB
Go
package main
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import (
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"fmt"
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"io"
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"math/rand"
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"net"
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"os"
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"strings"
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"sync"
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"time"
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)
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var (
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dataPath = "/projects/exo/expl.speck"
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)
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func log_error(template string, args ...interface{}) {
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fmt.Fprint(os.Stderr, "ERROR ")
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fmt.Fprintf(os.Stderr, template+"\n", args...)
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}
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func log_info(template string, args ...interface{}) {
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fmt.Fprint(os.Stdout, "INFO ")
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fmt.Fprintf(os.Stdout, template+"\n", args...)
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}
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func bail(status int, template string, args ...interface{}) {
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if status == 0 {
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fmt.Fprintf(os.Stdout, template, args...)
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} else {
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fmt.Fprintf(os.Stderr, template, args...)
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}
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os.Exit(status)
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}
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func handleConnection(conn *Connection) {
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var mu sync.Mutex
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defer conn.Close()
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conn.Login()
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planet, err := randomPlanet()
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if err != nil {
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log_error("player %s failed to get random planet: %v", conn.PlayerName(), err)
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return
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}
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planet.Arrive(conn)
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if planet.planets == 1 {
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fmt.Fprintf(conn, "you are in the system %s. There is %d planet here.\n", planet.name, planet.planets)
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} else {
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fmt.Fprintf(conn, "you are in the system %s. There are %d planets here.\n", planet.name, planet.planets)
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}
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for {
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line, err := conn.ReadString('\n')
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switch err {
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case io.EOF:
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return
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case nil:
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break
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default:
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log_error("failed to read line from player %s: %v", conn.PlayerName(), err)
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}
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line = strings.TrimSpace(line)
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parts := strings.Split(line, " ")
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if isCommand(parts[0]) {
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runCommand(conn, parts[0], parts[1:]...)
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continue
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}
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switch parts[0] {
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case "scan":
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for _, otherPlanet := range index {
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if otherPlanet.name == planet.name {
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continue
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}
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go func(p *System) {
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dist := planetDistance(*planet, *p)
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delay := time.Duration(int64(dist * 100000000))
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time.Sleep(delay)
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mu.Lock()
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fmt.Fprintf(conn, "PONG from planet %s (%v)\n", p.name, delay)
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mu.Unlock()
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}(otherPlanet)
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}
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case "broadcast":
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msg := strings.Join(parts[1:], " ")
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log_info("player %s is broadcasting message %s", conn.PlayerName(), msg)
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for _, otherSystem := range index {
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if otherSystem.name == planet.name {
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log_info("skpping duplicate system %s", planet.name)
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continue
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}
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go func(s *System) {
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log_info("message reached planet %s with %d inhabitants", s.name, s.NumInhabitants())
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dist := planetDistance(*planet, *s) * 0.5
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delay := time.Duration(int64(dist * 100000000))
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time.Sleep(delay)
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s.EachConn(func(conn *Connection) {
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fmt.Fprintln(conn, msg)
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})
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}(otherSystem)
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}
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case "nearby":
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neighbors, err := planet.Nearby(25)
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fmt.Fprintf(conn, "fetching nearby star systems\n")
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if err != nil {
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log_error("%v", err)
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break
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}
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fmt.Fprintf(conn, "found %d nearby systems\n", len(neighbors))
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for _, neighbor := range neighbors {
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other := index[neighbor.id]
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fmt.Fprintf(conn, "%s: %v\n", other.name, neighbor.distance)
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}
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case "quit":
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return
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default:
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fmt.Fprintf(conn, "hmm I'm not sure I know that one.\n")
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}
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}
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}
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func main() {
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dbconnect()
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rand.Seed(time.Now().UnixNano())
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setupDb()
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listener, err := net.Listen("tcp", ":9220")
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if err != nil {
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bail(E_No_Port, "unable to start server: %v", err)
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}
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for {
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conn, err := listener.Accept()
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if err != nil {
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log_error("error accepting connection: %v", err)
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continue
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}
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go handleConnection(NewConnection(conn))
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}
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}
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