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128 lines
2.5 KiB
Go
128 lines
2.5 KiB
Go
package main
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import (
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"database/sql"
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"fmt"
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_ "github.com/mattn/go-sqlite3"
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"math"
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"math/rand"
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"os"
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)
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var (
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planetIndex map[int]exoSystem
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db *sql.DB
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)
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func dbconnect() {
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var err error
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db, err = sql.Open("sqlite3", "./exo.db")
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if err != nil {
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bail(E_No_DB, "couldn't connect to db: %v", err)
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}
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}
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func planetsTable() {
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stmnt := `create table if not exists planets (
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id integer not null primary key autoincrement,
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name text,
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x integer,
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y integer,
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z integer,
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planets integer
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);`
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if _, err := db.Exec(stmnt); err != nil {
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log_error("couldn't create planets table: %v", err)
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}
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}
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func planetsData() {
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n, err := countPlanets()
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if err != nil {
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log_error("couldn't count planets: %v", err)
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return
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}
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if n == 0 {
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fi, err := os.Open(dataPath)
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if err != nil {
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bail(E_No_Data, "unable to open data path: %v", err)
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}
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c := make(chan exoSystem)
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go speckStream(fi, c)
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for planet := range c {
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planet.Store(db)
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}
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}
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indexPlanets(db)
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}
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func edgesTable() {
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stmnt := `create table if not exists edges (
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id_1 integer,
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id_2 integer,
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distance real
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);`
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if _, err := db.Exec(stmnt); err != nil {
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log_error("couldn't create distance table: %v", err)
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}
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}
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func setupDb() {
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planetsTable()
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planetsData()
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edgesTable()
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playersTable()
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// fillEdges(db, idx)
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}
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func sq(x float64) float64 {
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return x * x
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}
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func dist3d(x1, y1, z1, x2, y2, z2 float64) float64 {
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return math.Sqrt(sq(x1-x2) + sq(y1-y2) + sq(z1-z2))
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}
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func planetDistance(p1, p2 exoSystem) float64 {
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return dist3d(p1.x, p1.y, p1.z, p2.x, p2.y, p2.z)
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}
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func indexPlanets(db *sql.DB) map[int]exoSystem {
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rows, err := db.Query(`select * from planets`)
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if err != nil {
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log_error("unable to select all planets: %v", err)
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return nil
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}
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defer rows.Close()
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planetIndex = make(map[int]exoSystem, 551)
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for rows.Next() {
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var id int
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p := exoSystem{}
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if err := rows.Scan(&id, &p.name, &p.x, &p.y, &p.z, &p.planets); err != nil {
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log_info("unable to scan planet row: %v", err)
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continue
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}
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planetIndex[id] = p
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}
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return planetIndex
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}
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func fillEdges(db *sql.DB, planets map[int]exoSystem) {
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for i := 0; i < len(planets); i++ {
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for j := i + 1; j < len(planets); j++ {
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log_info("distance from %s to %s: %v", planets[i].name, planets[j].name, planetDistance(planets[i], planets[j]))
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}
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}
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}
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func randomPlanet() (*exoSystem, error) {
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n := len(planetIndex)
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if n == 0 {
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return nil, fmt.Errorf("no planets are known to exist")
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}
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pick := rand.Intn(n)
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planet := planetIndex[pick]
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return &planet, nil
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}
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