fix (plugin): extend API for plugins

server/common/config.go

@@ -148,7 +148,12 @@ func (this Config) Interface() interface{} {
 }
 
 func (this Config) save() {
+	if this.path == nil {
+		Log.Error("Config error")
+		return
+	}
 	if gjson.Valid(this.json) == false {
+		Log.Error("Config error")
 		return
 	}
 	if f, err := os.OpenFile(configPath, os.O_WRONLY|os.O_CREATE, os.ModePerm); err == nil {

server/common/constants.go

@@ -3,6 +3,7 @@ package common
 const (
 	APP_VERSION = "v0.3"
 	CONFIG_PATH = "data/config/"
+	PLUGIN_PATH = "data/plugin/"
 	COOKIE_NAME_AUTH = "auth"
 	COOKIE_NAME_PROOF = "proof"
 	COOKIE_PATH = "/api/"

server/common/debug.go

@@ -0,0 +1,21 @@
+package common
+
+import (
+	"runtime"
+	"fmt"
+)
+
+func PrintMemUsage() {
+	var m runtime.MemStats
+	runtime.ReadMemStats(&m)
+	// For info on each, see: https://golang.org/pkg/runtime/#MemStats
+	fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))
+	fmt.Printf("\tTotalAlloc = %v MiB", bToMb(m.TotalAlloc))
+	fmt.Printf("\tSys = %v MiB", bToMb(m.Sys))
+	fmt.Printf("\tObjects = %d", m.HeapObjects)
+	fmt.Printf("\tNumGC = %v\n", m.NumGC)
+}
+
+func bToMb(b uint64) uint64 {
+    return b / 1024 / 1024
+}

server/common/plugin.go

@@ -1,11 +1,25 @@
 package common
 
-type Plugin struct {
+import (
-	Type     string
+	"io"
-	Call     interface{}
+	"net/http"
-	Priority int
+)
+
+type Register struct{}
+type Get struct{}
+
+var Hooks = struct {
+	Get Get
+	Register Register
+}{
+	Get: Get{},
+	Register: Register{},
 }
 
-const (
+var process_file_content_before_send []func(io.Reader, *App, *http.ResponseWriter, *http.Request) (io.Reader, error)
-	PROCESS_FILE_CONTENT_BEFORE_SEND = "PROCESS_FILE_CONTENT_BEFORE_SEND"
+func (this Register) ProcessFileContentBeforeSend(fn func(io.Reader, *App, *http.ResponseWriter, *http.Request) (io.Reader, error)) {
-)
+	process_file_content_before_send = append(process_file_content_before_send, fn)
+}
+func (this Get) ProcessFileContentBeforeSend() []func(io.Reader, *App, *http.ResponseWriter, *http.Request) (io.Reader, error) {
+	return process_file_content_before_send
+}

server/ctrl/files.go

@@ -3,7 +3,6 @@ package ctrl
 import (
 	. "github.com/mickael-kerjean/nuage/server/common"
 	"github.com/mickael-kerjean/nuage/server/model"
-	"github.com/mickael-kerjean/nuage/server/plugin"
 	"io"
 	"net/http"
 	"path/filepath"
@@ -114,10 +113,7 @@ func FileCat(ctx App, res http.ResponseWriter, req *http.Request) {
 	mType := GetMimeType(req.URL.Query().Get("path"))
 	res.Header().Set("Content-Type", mType)
 
-	for _, obj := range plugin.ProcessFileContentBeforeSend() {
+	for _, obj := range Hooks.Get.ProcessFileContentBeforeSend() {
-		if obj == nil {
-			continue
-		}
 		if file, err = obj(file, &ctx, &res, req); err != nil {
 			SendErrorResult(res, err)
 			return

server/plugin/example/build.sh

@@ -1,3 +0,0 @@
-#!/bin/bash
-
-go build -buildmode=plugin -o ../../../dist/data/plugin/example.so index.go

server/plugin/example/index.go

@@ -1,25 +0,0 @@
-package main
-
-import (
-	. "github.com/mickael-kerjean/nuage/server/common"
-	"io"
-	"net/http"
-)
-
-func Register(config *Config) []Plugin {
-	config.Get("plugins.example.foo").Default("bar")
-
-	return []Plugin{
-		{
-			Type: PROCESS_FILE_CONTENT_BEFORE_SEND, // where to hook our plugin in the request lifecycle
-			Call: hook, // actual function we trigger
-			Priority: 5, // determine execution order whilst multiple plugin type
-		},
-	}
-}
-
-func hook(file io.Reader, ctx *App, res *http.ResponseWriter, req *http.Request) (io.Reader, error){
-	Log.Debug("Plugin::Example")
-	Log.Debug("Conf: plugins.example.foo = '%s'", ctx.Config.Get("plugins.example.foo").String())
-	return file, nil
-}

server/plugin/image_heavy/index.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"bytes"
+	. "github.com/mickael-kerjean/nuage/server/common"
+	"github.com/nfnt/resize"
+    "image/jpeg"
+	"io"
+	"net/http"
+)
+
+func Init(config *Config) {
+	plugin_enable := config.Get("transcoder.image.enable").Default(true).Bool()
+	plugin_thumbsize := uint(config.Get("transcoder.image.thumbnail_size").Default(300).Int())
+
+	Hooks.Register.ProcessFileContentBeforeSend(func(reader io.Reader, ctx *App, res *http.ResponseWriter, req *http.Request) (io.Reader, error){
+		if plugin_enable == false {
+			return reader, nil
+		}
+
+		query := req.URL.Query()
+		mType := GetMimeType(query.Get("path"))
+
+		if mType != "image/jpeg" {
+			return reader, nil
+		} else if query.Get("thumbnail") != "true" {
+			return reader, nil
+		}
+
+		(*res).Header().Set("Cache-Control", "max-age=3600")
+		img, err := jpeg.Decode(reader)
+		if err != nil {
+			return reader, nil
+		}
+		if obj, ok := reader.(interface{ Close() error }); ok {
+			obj.Close()
+		}
+		img = resize.Resize(plugin_thumbsize, 0, img, resize.Lanczos3)
+		out := bytes.NewBufferString("")
+		jpeg.Encode(out, img, &jpeg.Options{50})
+		return out, nil
+	})
+}

server/plugin/image_light/index.go

@@ -15,27 +15,17 @@ const (
 	ImageCachePath = "data/cache/image/"
 )
 
-func Register(conf *Config) []Plugin {
+func Init(conf *Config) {
-	conf.Get("plugins.transcoder.image.enable").Default(true)
+	plugin_enable := conf.Get("transcoder.image.enable").Default(true).Bool()
 
 	cachePath := filepath.Join(GetCurrentDir(), ImageCachePath)
 	os.RemoveAll(cachePath)
 	os.MkdirAll(cachePath, os.ModePerm)
 
-	return []Plugin{
+	Hooks.Register.ProcessFileContentBeforeSend(func (reader io.Reader, ctx *App, res *http.ResponseWriter, req *http.Request) (io.Reader, error){
-		{
+		if plugin_enable == false {
-			Type: PROCESS_FILE_CONTENT_BEFORE_SEND, // where to hook our plugin in the request lifecycle
-			Call: hook, // actual function we trigger
-			Priority: -1, // last plugin to execute
-		},
-	}
-}
-
-func hook(reader io.Reader, ctx *App, res *http.ResponseWriter, req *http.Request) (io.Reader, error){
-	if ctx.Config.Get("plugins.transcoder.image.enable").Bool() == false {
 			return reader, nil
 		}
-	Log.Debug("Plugin::Image")
 
 		query := req.URL.Query()
 		mType := GetMimeType(query.Get("path"))
@@ -106,4 +96,5 @@ func hook(reader io.Reader, ctx *App, res *http.ResponseWriter, req *http.Reques
 			return reader, nil
 		}
 		return lib.CreateThumbnail(transform)
+	})
 }

server/plugin/index.go

@@ -1,23 +1,16 @@
 package plugin
 
 import (
+	. "github.com/mickael-kerjean/nuage/server/common"
 	"os"
 	"path/filepath"
 	plg "plugin"
-	. "github.com/mickael-kerjean/nuage/server/common"
-	"sort"
 	"strings"
-	"net/http"
-	"io"
 )
 
-const PluginPath = "data/plugin/"
-
-var plugins = make(map[string][]Plugin)
-
 func init() {
 	ex, _ := os.Executable()
-	pPath := filepath.Join(filepath.Dir(ex), PluginPath)
+	pPath := filepath.Join(filepath.Dir(ex), PLUGIN_PATH)
 
 	file, err := os.Open(pPath)
 	if err != nil {
@@ -28,7 +21,7 @@ func init() {
 	c := NewConfig()
 	for i:=0; i < len(files); i++ {
 		name := files[i].Name()
-		if strings.HasPrefix(name, ".") == true {
+		if strings.HasPrefix(name, ".") {
 			continue
 		}
 		p, err := plg.Open(pPath + "/" + name)
@@ -36,32 +29,13 @@ func init() {
 			Log.Warning("Can't load plugin: %s => %v", name, err)
 			continue
 		}
-		
+		fn, err := p.Lookup("Init")
-		f, err := p.Lookup("Register")
 		if err != nil {
 			Log.Warning("Can't register plugin: %s => %v", name, err)
 			continue
 		}
-		if obj, ok := f.(func(config *Config) []Plugin); ok {
+		if obj, ok := fn.(func(config *Config)); ok {
-			for _, plg := range obj(c) {
+			obj(c)
-				plugins[plg.Type] = append(plugins[plg.Type], plg)
-				sort.SliceStable(plugins[plg.Type], func(i, j int) bool {
-					return plugins[plg.Type][i].Priority > plugins[plg.Type][j].Priority
-				})
-			}
 		}
 	}
 }
-
-
-func ProcessFileContentBeforeSend() []func(io.Reader, *App, *http.ResponseWriter, *http.Request) (io.Reader, error) {
-	fs := plugins[PROCESS_FILE_CONTENT_BEFORE_SEND]
-	ret := make([]func(io.Reader, *App, *http.ResponseWriter, *http.Request) (io.Reader, error), len(fs))
-	for _, p := range fs {
-		if f, ok := p.Call.(func(io.Reader, *App, *http.ResponseWriter, *http.Request) (io.Reader, error)); ok {
-			ret = append(ret, f)	
-		}
-	}
-	return ret
-}
-