/
main.go
313 lines (270 loc) · 7.42 KB
/
main.go
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package main
import (
"database/sql"
"encoding/json"
"flag"
"fmt"
_ "github.com/lib/pq"
_ "github.com/mattn/go-sqlite3"
// "io/ioutil"
"log"
"net/http"
"os"
"runtime"
"strconv"
)
const version = "0.0.0"
var dbtypes = map[string]bool{
"sqlite": true,
"postgres": true,
}
var database string
var user string
var pass string
var port uint
var dbtype string
func init() {
const (
dbtypeDefault = ""
dbtypeUsage = "database type (sqlite or postgres)"
databaseDefault = ""
databaseUsage = "database"
userDefault = ""
userUsage = "database user"
passDefault = ""
passUsage = "database password"
portDefault = 0
portUsage = "http serve port"
)
flag.StringVar(&dbtype, "type", dbtypeDefault, dbtypeUsage)
flag.StringVar(&dbtype, "t", dbtypeDefault, dbtypeUsage+" (shorthand)")
flag.StringVar(&database, "database", databaseDefault, databaseUsage)
flag.StringVar(&database, "d", databaseDefault, databaseUsage+" (shorthand)")
flag.StringVar(&user, "user", userDefault, userUsage)
flag.StringVar(&user, "u", userDefault, userUsage+" (shorthand)")
flag.StringVar(&pass, "password", passDefault, passUsage)
flag.StringVar(&pass, "pass", passDefault, passUsage+" (shorthand)")
flag.UintVar(&port, "port", portDefault, portUsage)
flag.UintVar(&port, "p", portDefault, portUsage+" (shorthand)")
}
func printUsage() {
exeName := os.Args[0]
fmt.Println(exeName + " " + version + " usage: ")
fmt.Println("\t" + exeName + " -t postgres -d star-database -u database-user-name -pass database-user-password -p serve-port")
fmt.Println("\t" + exeName + " -t sqlite -d star-database.sqlite -p serve-port")
fmt.Println("flags:")
flag.PrintDefaults()
fmt.Println("example:\n\t" + exeName + " -d hyg -u jimbob -p nascarrulez -p 8008")
}
type Star struct {
Id int64 `json:"id"`
Name string `json:"name"`
X float64 `json:"x"`
Y float64 `json:"y"`
Z float64 `json:"z"`
Color float32 `json:"color"`
AbsoluteMagnitude float32 `json:"absolute-magnitude"`
Spectrum string `json:"spectrum"`
}
func (star *Star) Json() []byte {
bytes, err := json.Marshal(star)
if err != nil {
return nil ///< @todo fix to return JSON error
}
return bytes
}
type NullStar struct {
Id sql.NullInt64
Name sql.NullString
X sql.NullFloat64
Y sql.NullFloat64
Z sql.NullFloat64
Color sql.NullFloat64
AbsoluteMagnitude sql.NullFloat64
Spectrum sql.NullString
}
/// returns a Star, with zero values for any null values in the NullStar
func (nstar *NullStar) Star() Star {
var star Star
if nstar.Id.Valid {
star.Id = nstar.Id.Int64
}
if nstar.Name.Valid {
star.Name = nstar.Name.String
}
if nstar.X.Valid {
star.X = nstar.X.Float64
}
if nstar.Y.Valid {
star.Y = nstar.Y.Float64
}
if nstar.Z.Valid {
star.Z = nstar.Z.Float64
}
if nstar.Color.Valid {
star.Color = float32(nstar.Color.Float64)
}
if nstar.AbsoluteMagnitude.Valid {
star.AbsoluteMagnitude = float32(nstar.AbsoluteMagnitude.Float64)
}
if nstar.Spectrum.Valid {
star.Spectrum = nstar.Spectrum.String
}
return star
}
func postgresDbManager(user string, pass string, getStar chan struct {
id int64
callback chan Star
}) {
// fmt.Println("Opening " + "postgres://" + user + ":" + pass + "@localhost/"+database)
// url := "postgres://"+user+":"+pass+"@localhost/"+database
// connection, _ := pq.ParseURL(url)
// connection += " sslmode=require"
connstr := "user=" + user + " dbname=" + database + " password=" + pass
fmt.Println("Opening " + connstr)
db, err := sql.Open("postgres", connstr)
if err != nil {
fmt.Println("postgresDbManager FAILED open")
log.Fatal(err)
}
defer db.Close()
sql := "select propername, x, y, z, colorindex, absmag, spectrum from hygxyz where starid = $1"
stmt, err := db.Prepare(sql)
if err != nil {
fmt.Println("dbManager FAILED prepare")
log.Fatal(err)
}
for {
request := <-getStar
rows, err := stmt.Query(request.id)
if err != nil {
fmt.Println("dbManager FAILED query")
log.Fatal(err)
}
if !rows.Next() {
request.callback <- Star{}
continue
}
var nstar NullStar
err = rows.Scan(&nstar.Name, &nstar.X, &nstar.Y, &nstar.Z, &nstar.Color, &nstar.AbsoluteMagnitude, &nstar.Spectrum)
if err != nil {
fmt.Println("dbManager FAILED scan")
log.Fatal(err)
}
star := nstar.Star()
star.Id = request.id
request.callback <- star // return zero values for null fields
rows.Close()
}
}
func sqliteDbManager(getStar chan struct {
id int64
callback chan Star
}) {
db, err := sql.Open("sqlite3", database)
if err != nil {
fmt.Println("sqliteDbManager FAILED open")
log.Fatal(err)
}
defer db.Close()
sql := "select propername, x, y, z, colorindex, absmag, spectrum from hygxyz where starid = ?"
stmt, err := db.Prepare(sql)
if err != nil {
fmt.Println("dbManager FAILED prepare")
log.Fatal(err)
}
for {
request := <-getStar
rows, err := stmt.Query(request.id)
if err != nil {
fmt.Println("dbManager FAILED query")
log.Fatal(err)
}
if !rows.Next() {
request.callback <- Star{}
continue
}
var nstar NullStar
err = rows.Scan(&nstar.Name, &nstar.X, &nstar.Y, &nstar.Z, &nstar.Color, &nstar.AbsoluteMagnitude, &nstar.Spectrum)
if err != nil {
fmt.Println("dbManager FAILED scan")
log.Fatal(err)
}
star := nstar.Star()
star.Id = request.id
request.callback <- star // return zero values for null fields
rows.Close()
}
}
const services = `{"services" : ["star/{id}"]}`
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
flag.Parse()
if !dbtypes[dbtype] || database == "" || port == 0 || port > 65535 {
printUsage()
return
}
if dbtype == "postgres" {
if user == "" || pass == "" {
printUsage()
return
}
}
if dbtype == "sqlite" {
_, err := os.Stat(database)
if os.IsNotExist(err) {
fmt.Printf("sqlite database file does not exist: %s", database)
return
}
}
getStar := make(chan struct {
id int64
callback chan Star
}, 100)
if dbtype == "postgres" {
go postgresDbManager(user, pass, getStar)
} else {
go sqliteDbManager(getStar)
}
serveServicesList := func(w http.ResponseWriter) error {
w.Header().Add("Content-Type", "application/json")
w.Header().Add("Content-Length", strconv.Itoa(len(services)))
_, err := w.Write([]byte(services))
return err
}
serveStar := func(w http.ResponseWriter, id int64) error {
getStarCallback := make(chan Star)
getStar <- struct {
id int64
callback chan Star
}{id, getStarCallback}
star := <-getStarCallback
starjson := star.Json()
w.Header().Add("Content-Type", "application/json")
w.Header().Add("Content-Length", strconv.Itoa(len(starjson)))
_, err := w.Write(starjson)
return err
}
http.HandleFunc("/star/", func(w http.ResponseWriter, r *http.Request) {
fmt.Println("Serving request to " + r.URL.Path)
staridStr := r.URL.Path[len("/star/"):]
starid, err := strconv.ParseInt(staridStr, 10, 64)
_, err = strconv.Atoi(staridStr)
if err != nil {
serveServicesList(w)
return
}
err = serveStar(w, starid)
if err != nil {
fmt.Println(err)
}
})
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
err := serveServicesList(w)
if err != nil {
fmt.Println(err)
}
})
fmt.Println("Serving on " + strconv.Itoa(int(port)) + "...")
http.ListenAndServe(":"+strconv.Itoa(int(port)), nil)
}