WIP: more nae nae

.gitignore

@@ -1,3 +1,7 @@
+db.json
+/cmd/again/again
+/again
+
 # ---> Go
 # Binaries for programs and plugins
 *.exe

cmd/again/again.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"flag"
 	"fmt"
 	"log"
@@ -9,14 +10,17 @@ import (
 	"strconv"
 	"time"
 
+	again "git.rootprojects.org/root/go-again"
 	"git.rootprojects.org/root/go-again/data/jsondb"
 )
 
 func main() {
 	portEnv := os.Getenv("PORT")
+	dbEnv := os.Getenv("DATABASE_URL")
 
 	portInt := flag.Int("port", 0, "port on which to serve http")
 	addr := flag.String("addr", "", "address on which to serve http")
+	dburl := flag.String("database-url", "", "For example: json://relative-path/db.json or json:///absolute-path/db.json")
 	flag.Parse()
 
 	if "" != portEnv {
@@ -32,24 +36,86 @@ func main() {
 		*portInt = n
 	}
 	if *portInt < 1024 || *portInt > 65535 {
-		log.Fatalf("port should be between 1024 and 65535, not %d.", *portInt)
+		log.Fatalf("`port` should be between 1024 and 65535, not %d.", *portInt)
 		return
 	}
 	portEnv = strconv.Itoa(*portInt)
 
+	if "" != dbEnv {
+		if "" != *dburl {
+			log.Fatal("You may set DATABASE_URL or --database-url, but not both.")
+			return
+		}
+		*dburl = dbEnv
+		// TODO parse string?
+		// TODO have each connector try in sequence by registering with build tags like go-migrate does?
+	}
+	if "" == *dburl {
+		log.Fatalf("`database-url` must be specified." +
+			" Something like --database-url='json:///var/go-again/db.json' should do nicely.")
+		return
+	}
+
+	db, err := jsondb.Connect(*dburl)
+	if nil != err {
+		log.Fatalf("Could not connect to database %q: %s", *dburl, err)
+		return
+	}
+
+	s := &scheduler{
+		DB: db,
+	}
+	mux := http.NewServeMux()
 	server := &http.Server{
 		Addr:           fmt.Sprintf("%s:%s", *addr, portEnv),
-		Handler:        http.HandlerFunc(handleFunc),
+		Handler:        mux,
 		ReadTimeout:    10 * time.Second,
 		WriteTimeout:   10 * time.Second,
 		MaxHeaderBytes: 1 << 20,
 	}
+	//mux.Handle("/api/", http.HandlerFunc(handleFunc))
+	mux.HandleFunc("/api/schedules", s.Handle)
+
+	// TODO Filebox FS
+	mux.Handle("/", http.FileServer(http.Dir("./public")))
 
 	fmt.Println("Listening on", server.Addr)
 	log.Fatal(server.ListenAndServe())
 }
 
-func handleFunc(w http.ResponseWriter, r *http.Request) {
-	jsondb.List()
-	w.Write([]byte("Hello, World!"))
+type ScheduleDB interface {
+	List() ([]again.Schedule, error)
+}
+
+type scheduler struct {
+	DB ScheduleDB
+}
+
+func (s *scheduler) Handle(w http.ResponseWriter, r *http.Request) {
+	fmt.Println("whatever", r.Method, r.URL)
+	switch r.Method {
+	case http.MethodGet:
+		s.List(w, r)
+		return
+	case http.MethodPost:
+		http.Error(w, "Not Implemented", http.StatusNotImplemented)
+		return
+	default:
+		http.Error(w, "Not Implemented", http.StatusNotImplemented)
+		return
+	}
+}
+
+func (s *scheduler) List(w http.ResponseWriter, r *http.Request) {
+	schedules, err := s.DB.List()
+	if nil != err {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	buf, err := json.Marshal(schedules)
+	if nil != err {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Write(buf)
 }

data/jsondb/jsondb.go

@@ -1,11 +1,78 @@
 package jsondb
 
 import (
-	"errors"
+	"encoding/json"
+	"fmt"
+	"net/url"
+	"os"
+	"strings"
 
 	again "git.rootprojects.org/root/go-again"
 )
 
-func List() ([]again.Schedule, error) {
-	return nil, errors.New("Not Implemented")
+type JSONDB struct {
+	dburl string
+	file  *os.File
+	json  *dbjson
+}
+
+type dbjson struct {
+	Schedules []again.Schedule `json:"schedules"`
+}
+
+func Connect(dburl string) (*JSONDB, error) {
+	u, err := url.Parse(dburl)
+	if nil != err {
+		return nil, err
+	}
+
+	// json:/abspath/to/db.json
+	fmt.Println("url.Opaque:", u.Opaque)
+	// json:///abspath/to/db.json
+	fmt.Println("url.Path:", u.Path)
+	fmt.Println(u)
+
+	path := u.Opaque
+	if "" == path {
+		path = u.Path
+		if "" == path {
+			// json:relpath/to/db.json
+			// json://relpath/to/db.json
+			path = strings.TrimSuffix(u.Host+"/"+u.Path, "/")
+		}
+	}
+
+	f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, 0700)
+	if nil != err {
+		return nil, fmt.Errorf("Couldn't open %q: %s", path, err)
+	}
+
+	stat, err := f.Stat()
+	if 0 == stat.Size() {
+		_, err := f.Write([]byte(`{"schedules":[]}`))
+		if nil != err {
+			return nil, err
+		}
+		f, err = os.OpenFile(path, os.O_RDWR|os.O_CREATE, 0700)
+		if nil != err {
+			return nil, err
+		}
+	}
+
+	decoder := json.NewDecoder(f)
+	db := &dbjson{}
+	err = decoder.Decode(db)
+	if nil != err {
+		return nil, fmt.Errorf("Couldn't parse %q as JSON: %s", path, err)
+	}
+
+	return &JSONDB{
+		dburl: dburl,
+		file:  f,
+		json:  db,
+	}, nil
+}
+
+func (db *JSONDB) List() ([]again.Schedule, error) {
+	return db.json.Schedules, nil
 }

public/index.html

@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<title>Go Again</title>
+	</head>
+	<body>
+		<h1>Hello, World!</h1>
+	</body>
+</html>