package main
import (
"database/sql"
"flag"
"fmt"
"github.com/gorilla/mux"
"log"
"net/http"
"os"
"strconv"
"git.darknebu.la/GalaxySimulator/db-controller/backend"
)
var (
db *sql.DB
)
func indexHandler(w http.ResponseWriter, r *http.Request) {
indexString := `Galaxy Simulator Database Frontend
API:
/ (GET)
/new (POST)
Create a new Tree
Parameters:
-
w float64: width of the tree
/deleteStars (POST)
Delete all stars from the stars Table
Parameters:
/deleteNodes (POST)
Delete all nodes from the nodes Table
Parameters:
/starslist/go (GET)
List all stars using go-array format
Parameters:
/starslist/csv (GET)
List all stars as a csv
Parameters:
/updatetotalmass (POST)
Update the total mass of all the nodes in the tree with the given index
Parameters:
-
index int: index of the tree
/updatecenterofmass (POST)
Update the center of mass of all the nodes in the tree with the given index
Parameters:
-
index int: index of the tree
/genforesttree (GET)
Generate the forest representation of the tree with the given index
Parameters:
-
index int: index of the tree
`
_, _ = fmt.Fprintf(w, "%s", indexString)
}
func newTreeHandler(w http.ResponseWriter, r *http.Request) {
width, _ := strconv.ParseFloat(r.Form.Get("w"), 64)
backend.NewTree(db, width)
}
func deleteStarsHandler(w http.ResponseWriter, r *http.Request) {
backend.DeleteAllNodes(db)
}
func deleteNodesHandler(w http.ResponseWriter, r *http.Request) {
backend.DeleteAllStars(db)
}
func starslistGoHandler(w http.ResponseWriter, r *http.Request) {
backend.GetListOfStarsGo(db)
}
func starslistCsvHandler(w http.ResponseWriter, r *http.Request) {
backend.GetListOfStarsCsv(db)
}
func updateTotalMassHandler(w http.ResponseWriter, r *http.Request) {
index, _ := strconv.ParseInt(r.Form.Get("index"), 10, 64)
backend.UpdateTotalMass(db, index)
}
func updateCenterOfMassHandler(w http.ResponseWriter, r *http.Request) {
index, _ := strconv.ParseInt(r.Form.Get("index"), 10, 64)
backend.UpdateCenterOfMass(db, index)
}
func genForestTreeHandler(w http.ResponseWriter, r *http.Request) {
index, _ := strconv.ParseInt(r.Form.Get("index"), 10, 64)
backend.GenForestTree(db, index)
}
func createNodesTableHandler(w http.ResponseWriter, r *http.Request) {
backend.InitNodesTable(db)
}
func createStarsTableHandler(w http.ResponseWriter, r *http.Request) {
backend.InitStarsTable(db)
}
func main() {
// get the port on which the service should be hosted and the url of the database
var port string
flag.StringVar(&port, "port", "8080", "port used to host the service")
var dbURL string
flag.StringVar(&dbURL, "DBURL", "postgres", "url of the database used")
flag.Parse()
log.Println("[ ] Done loading the flags")
// get the data that should be used to connect to the database
var DBUSER = os.Getenv("DBUSER")
var DBPASSWD = os.Getenv("DBPASSWD")
var DBPORT, _ = strconv.ParseInt(os.Getenv("DBPORT"), 10, 64)
var DBPROJECTNAME = os.Getenv("DBPROJECTNAME")
log.Println("[ ] Done loading the envs")
// connect to the database
connStr := fmt.Sprintf("host=%s port=%d user=%s "+
"password=%s dbname=%s sslmode=disable",
dbURL, DBPORT, DBUSER, DBPASSWD, DBPROJECTNAME)
log.Printf("[ ] Done assembling the connString: %s", connStr)
db, err := sql.Open("postgres", connStr)
if err != nil {
_ = fmt.Errorf("%s", err)
}
log.Println("[ ] Done Connecting to the DB")
// ping the db
err = db.Ping()
if err != nil {
panic(err)
}
log.Println("[ ] Done Pinging the DB")
// define a new mux router
router := mux.NewRouter()
// define the endpoints
router.HandleFunc("/", indexHandler).Methods("GET")
router.HandleFunc("/newTree", newTreeHandler).Methods("POST")
router.HandleFunc("/deleteStars", deleteStarsHandler).Methods("POST")
router.HandleFunc("/deleteNodes", deleteNodesHandler).Methods("POST")
router.HandleFunc("/starslist/go", starslistGoHandler).Methods("GET")
router.HandleFunc("/starslist/csv", starslistCsvHandler).Methods("GET")
router.HandleFunc("/updateTotalMass", updateTotalMassHandler).Methods("POST")
router.HandleFunc("/updateCenterOfMass", updateCenterOfMassHandler).Methods("POST")
router.HandleFunc("/genForestTree", genForestTreeHandler).Methods("GET")
router.HandleFunc("/createNodesTable", createNodesTableHandler).Methods("POST")
router.HandleFunc("/createStarsTable", createStarsTableHandler).Methods("POST")
// start the http server on the port reached in via a flag
log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", port), router))
}