76 lines
2.0 KiB
Go
76 lines
2.0 KiB
Go
package server
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/user"
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"strings"
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)
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// Config embodies the configuration for a game. These are populated in various
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// ways (json POSTed to server, config file, constants) and are typically owned
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// by a Controller.
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type Config struct {
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Tick int `json:"tick"` // ms
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Timescale float32 `json:"timescale"`
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Delta float32 `json:"delta"`
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Width int `json:"width"`
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Height int `json:"height"`
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Obstacles int `json:"obstacles"`
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MaxPoints int `json:"max_points"`
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Mode string `json:"mode"`
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}
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const (
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TICK = 60 // ms, this is how often physics is updated
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TIMESCALE = 1.0 // this tweaks the temporal duration of a TICK
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WIDTH = 800
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HEIGHT = 550
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OBSTACLES = 5
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MAX_POINTS = 500 // allowing for 50 pts in every category
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DEFAULT_MODE = "deathmatch"
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)
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// LoadConfig takes the location of a json file that contains values desired to
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// be used in the creation of games. Priority is given to values specified at
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// game cration time using control channel, followed by values in config file,
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// followed by constants defined above.
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func LoadConfig(filename string) (Config, error) {
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c := Config{
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Tick: TICK,
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Timescale: TIMESCALE,
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Width: WIDTH,
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Height: HEIGHT,
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Obstacles: OBSTACLES,
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MaxPoints: MAX_POINTS,
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Mode: DEFAULT_MODE,
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}
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u, err := user.Current()
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if err != nil {
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return c, err
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}
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if len(filename) > 1 && filename[:2] == "~/" {
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filename = strings.Replace(filename, "~", u.HomeDir, 1)
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}
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if _, err := os.Stat(filename); os.IsNotExist(err) {
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log.Printf("%+v not found, using defaults", filename)
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} else {
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log.Printf("found config file: %s", filename)
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f, err := ioutil.ReadFile(filename)
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if err != nil {
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return c, err
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}
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err = json.Unmarshal(f, &c)
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if err != nil {
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return c, errors.New(fmt.Sprintf("config parse error: %s", err))
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}
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}
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c.Delta = (float32(c.Tick) / 1000.0) * float32(c.Timescale)
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log.Printf("final config: %+v", c)
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return c, nil
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}
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