🎉 Initial Commit

pkg/hypertext/init.go

@@ -0,0 +1,56 @@
+package hypertext
+
+import (
+	roadsign "code.smartsheep.studio/goatworks/roadsign/pkg"
+	"fmt"
+	"github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/middleware/limiter"
+	"github.com/rs/zerolog/log"
+	"github.com/spf13/viper"
+	"time"
+)
+
+func InitServer() *fiber.App {
+	app := fiber.New(fiber.Config{
+		AppName:               "RoadSign",
+		ServerHeader:          fmt.Sprintf("RoadSign v%s", roadsign.AppVersion),
+		DisableStartupMessage: true,
+		EnableIPValidation:    true,
+		EnablePrintRoutes:     viper.GetBool("debug.print_routes"),
+		Prefork:               viper.GetBool("performance.prefork"),
+		BodyLimit:             viper.GetInt("hypertext.limitation.max_body_size"),
+	})
+
+	if viper.GetInt("hypertext.limitation.max_qps") > 0 {
+		app.Use(limiter.New(limiter.Config{
+			Max:        viper.GetInt("hypertext.limitation.max_qps"),
+			Expiration: 1 * time.Second,
+		}))
+	}
+
+	UseProxies(app)
+
+	return app
+}
+
+func RunServer(app *fiber.App) {
+	for _, port := range viper.GetStringSlice("hypertext.ports") {
+		port := port
+		go func() {
+			if err := app.Listen(port); err != nil {
+				log.Panic().Err(err).Msg("An error occurred when listening hypertext tls ports.")
+			}
+		}()
+	}
+
+	for _, port := range viper.GetStringSlice("hypertext.secured_ports") {
+		port := port
+		pem := viper.GetString("hypertext.certificate.pem")
+		key := viper.GetString("hypertext.certificate.key")
+		go func() {
+			if err := app.ListenTLS(port, pem, key); err != nil {
+				log.Panic().Err(err).Msg("An error occurred when listening hypertext tls ports.")
+			}
+		}()
+	}
+}

pkg/hypertext/proxies.go

@@ -0,0 +1,140 @@
+package hypertext
+
+import (
+	"code.smartsheep.studio/goatworks/roadsign/pkg/configurator"
+	"fmt"
+	"github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/middleware/proxy"
+	"github.com/rs/zerolog/log"
+	"github.com/samber/lo"
+	"github.com/spf13/viper"
+	"github.com/valyala/fasthttp"
+	"math/rand"
+	"regexp"
+	"strings"
+	"time"
+)
+
+func UseProxies(app *fiber.App) {
+	app.All("/", func(ctx *fiber.Ctx) error {
+		host := ctx.Hostname()
+		path := ctx.Path()
+		queries := ctx.Queries()
+		headers := ctx.GetReqHeaders()
+
+		log.Debug().
+			Any("host", host).
+			Any("path", path).
+			Any("queries", queries).
+			Any("headers", headers).
+			Msg("A new request received")
+
+		// Filtering sites
+		for _, site := range configurator.C.Sites {
+			// Matching rules
+			for _, rule := range site.Rules {
+				if !lo.Contains(rule.Host, host) {
+					continue
+				} else if !lo.ContainsBy(rule.Path, func(item string) bool {
+					matched, err := regexp.MatchString(item, path)
+					return matched && err == nil
+				}) {
+					continue
+				}
+
+				flag := true
+
+				// Filter query strings
+				for rk, rv := range rule.Queries {
+					for ik, iv := range queries {
+						if rk != ik && rv != iv {
+							flag = false
+							break
+						}
+					}
+					if !flag {
+						break
+					}
+				}
+				if !flag {
+					continue
+				}
+
+				// Filter headers
+				for rk, rv := range rule.Headers {
+					for ik, iv := range headers {
+						if rk == ik {
+							for _, ov := range iv {
+								if !lo.Contains(rv, ov) {
+									flag = false
+									break
+								}
+							}
+						}
+						if !flag {
+							break
+						}
+					}
+					if !flag {
+						break
+					}
+				}
+				if !flag {
+					continue
+				}
+			}
+
+			// Passing all the rules means the site is what we are looking for.
+			// Let us respond to our client!
+			return makeResponse(ctx, site)
+		}
+
+		// There is no site available for this request.
+		// Just ignore it and give our client a not found status.
+		// Do not care about the user experience, we can do it in custom error handler.
+		return fiber.ErrNotFound
+	})
+}
+
+func doLoadBalance(site configurator.SiteConfig) *configurator.UpstreamConfig {
+	idx := rand.Intn(len(site.Upstreams))
+
+	switch site.Upstreams[idx].GetType() {
+	case configurator.UpstreamTypeHypertext:
+		return &site.Upstreams[idx]
+	case configurator.UpstreamTypeFile:
+		// TODO Make this into hypertext configuration
+		return &site.Upstreams[idx]
+	default:
+		// Give him the null value when this configuration is invalid.
+		// Then we can print a log in the console to warm him.
+		return nil
+	}
+}
+
+func makeRequestUri(ctx *fiber.Ctx, upstream configurator.UpstreamConfig) string {
+	var queries []string
+	for k, v := range ctx.Queries() {
+		queries = append(queries, fmt.Sprintf("%s=%s", k, v))
+	}
+
+	hash := string(ctx.Request().URI().Hash())
+
+	return upstream.URI +
+		lo.Ternary(len(queries) > 0, "?"+strings.Join(queries, "&"), "") +
+		lo.Ternary(len(hash) > 0, "#"+hash, "")
+}
+
+func makeResponse(ctx *fiber.Ctx, site configurator.SiteConfig) error {
+	upstream := doLoadBalance(site)
+	if upstream == nil {
+		log.Warn().Str("id", site.ID).Msg("There is no available upstream for this request.")
+		return fiber.ErrBadGateway
+	}
+
+	timeout := time.Duration(viper.GetInt64("performance.network_timeout")) * time.Millisecond
+	return proxy.Do(ctx, makeRequestUri(ctx, *upstream), &fasthttp.Client{
+		ReadTimeout:  timeout,
+		WriteTimeout: timeout,
+	})
+}