iz system

db.go

@@ -7,7 +7,6 @@ import (
 )
 
 var (
-	planetIndex map[int]Planet
 	db *sql.DB
 )
 
@@ -44,7 +43,7 @@ func planetsData() {
 		if err != nil {
 			bail(E_No_Data, "unable to open data path: %v", err)
 		}
-		c := make(chan Planet)
+		c := make(chan System)
 		go speckStream(fi, c)
 		for planet := range c {
 			planet.Store(db)
@@ -72,7 +71,7 @@ func setupDb() {
 	// fillEdges(db, idx)
 }
 
-func fillEdges(db *sql.DB, planets map[int]Planet) {
+func fillEdges(db *sql.DB, planets map[int]System) {
 	for i := 0; i < len(planets); i++ {
 		for j := i + 1; j < len(planets); j++ {
 			log_info("distance from %s to %s: %v", planets[i].name, planets[j].name, planetDistance(planets[i], planets[j]))

main.go

@@ -45,7 +45,11 @@ func handleConnection(conn *Connection) {
 		log_error("player %s failed to get random planet: %v", conn.PlayerName(), err)
 		return
 	}
-	fmt.Fprintf(conn, "you are on the planet %s\n", planet.name)
+	if planet.planets == 1 {
+		fmt.Fprintf(conn, "you are in the system %s. There is %d planet here.\n", planet.name, planet.planets)
+	} else {
+		fmt.Fprintf(conn, "you are in the system %s. There are %d planets here.\n", planet.name, planet.planets)
+	}
 	for {
 		line, err := conn.ReadString('\n')
 		switch err {
@@ -60,11 +64,11 @@ func handleConnection(conn *Connection) {
 		parts := strings.Split(line, " ")
 		switch parts[0] {
 		case "scan":
-			for _, otherPlanet := range planetIndex {
+			for _, otherPlanet := range index {
 				if otherPlanet.name == planet.name {
 					continue
 				}
-				go func(p Planet) {
+				go func(p System) {
 					dist := planetDistance(*planet, p)
 					delay := time.Duration(int64(dist * 100000000))
 					time.Sleep(delay)

speck.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 )
 
-func speckStream(r io.ReadCloser, c chan Planet) {
+func speckStream(r io.ReadCloser, c chan System) {
 	defer close(c)
 	defer r.Close()
 	keep := regexp.MustCompile(`^\s*[\d-]`)
@@ -34,11 +34,11 @@ func speckStream(r io.ReadCloser, c chan Planet) {
 	}
 }
 
-func parseSpeckLine(line []byte) *Planet {
+func parseSpeckLine(line []byte) *System {
 	parts := strings.Split(string(line), " ")
 	var err error
 	var g errorGroup
-	s := new(Planet)
+	s := new(System)
 
 	s.x, err = strconv.ParseFloat(parts[0], 64)
 	g.AddError(err)

system.go

@@ -7,13 +7,17 @@ import (
 	"math/rand"
 )
 
-type Planet struct {
+var (
+	index map[int]System
+)
+
+type System struct {
 	x, y, z float64
 	planets int
 	name    string
 }
 
-func (e Planet) Store(db *sql.DB) {
+func (e System) Store(db *sql.DB) {
 	_, err := db.Exec(`
     insert into planets
     (name, x, y, z, planets)
@@ -25,7 +29,7 @@ func (e Planet) Store(db *sql.DB) {
 	}
 }
 
-func (e Planet) String() string {
+func (e System) String() string {
 	return fmt.Sprintf("<name: %s x: %v y: %v z: %v planets: %v>", e.name, e.x, e.y, e.z, e.planets)
 }
 
@@ -45,37 +49,37 @@ func dist3d(x1, y1, z1, x2, y2, z2 float64) float64 {
 	return math.Sqrt(sq(x1-x2) + sq(y1-y2) + sq(z1-z2))
 }
 
-func planetDistance(p1, p2 Planet) float64 {
+func planetDistance(p1, p2 System) float64 {
 	return dist3d(p1.x, p1.y, p1.z, p2.x, p2.y, p2.z)
 }
 
-func indexPlanets(db *sql.DB) map[int]Planet {
+func indexPlanets(db *sql.DB) map[int]System {
 	rows, err := db.Query(`select * from planets`)
 	if err != nil {
 		log_error("unable to select all planets: %v", err)
 		return nil
 	}
 	defer rows.Close()
-	planetIndex = make(map[int]Planet, 551)
+	index = make(map[int]System, 551)
 	for rows.Next() {
 		var id int
-		p := Planet{}
+		p := System{}
 		if err := rows.Scan(&id, &p.name, &p.x, &p.y, &p.z, &p.planets); err != nil {
 			log_info("unable to scan planet row: %v", err)
 			continue
 		}
-		planetIndex[id] = p
+		index[id] = p
 	}
-	return planetIndex
+	return index
 }
 
-func randomPlanet() (*Planet, error) {
-	n := len(planetIndex)
+func randomPlanet() (*System, error) {
+	n := len(index)
 	if n == 0 {
 		return nil, fmt.Errorf("no planets are known to exist")
 	}
 
 	pick := rand.Intn(n)
-	planet := planetIndex[pick]
+	planet := index[pick]
 	return &planet, nil
 }