serve HTTP

server/cmd/main.go

@@ -4,6 +4,7 @@ import (
 	"flag"
 	"fmt"
 	"io"
+	"net/http"
 	"os"
 )
 
@@ -15,16 +16,26 @@ type iostreams struct {
 type Opts struct {
 	ConfigPath string
 	IO         iostreams
+	Log        func(string)
+	Logf       func(string, ...interface{})
 }
 
 func main() {
 	var configFlag = flag.String("config", "config.yml", "A path to a config file.")
 	flag.Parse()
+	io := iostreams{
+		Err: os.Stderr,
+		Out: os.Stdout,
+	}
 	opts := Opts{
 		ConfigPath: *configFlag,
-		IO: iostreams{
-			Err: os.Stderr,
-			Out: os.Stdout,
+		IO:         io,
+		// TODO use real logger
+		Log: func(s string) {
+			fmt.Fprintln(io.Out, s)
+		},
+		Logf: func(s string, args ...interface{}) {
+			fmt.Fprintf(io.Out, s, args...)
 		},
 	}
 
@@ -41,7 +52,27 @@ func _main(opts Opts) error {
 		os.Exit(1)
 	}
 
-	fmt.Printf("DBG %#v\n", cfg.InstanceName)
+	setupAPI(opts, *cfg)
+
+	// TODO TLS or SSL or something
+	opts.Logf("starting server at %s:%d\n", cfg.Host, cfg.Port)
+	if err := http.ListenAndServe(fmt.Sprintf("%s:%d", cfg.Host, cfg.Port), nil); err != nil {
+		return fmt.Errorf("http server exited with error: %w", err)
+	}
 
 	return nil
 }
+
+func handler(opts Opts, cfg Config, f http.HandlerFunc) http.HandlerFunc {
+	// TODO make this more real
+	return func(w http.ResponseWriter, req *http.Request) {
+		opts.Log(req.URL.Path)
+		f(w, req)
+	}
+}
+
+func setupAPI(opts Opts, cfg Config) {
+	http.HandleFunc("/instance", handler(opts, cfg, func(w http.ResponseWriter, req *http.Request) {
+		io.WriteString(w, cfg.InstanceName)
+	}))
+}