From bdff8e99eb4062fbdc175da075634f063a5b8f42 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Wed, 25 Jan 2017 22:53:29 +0100
Subject: added (faking) directory hasher


diff --git a/src/pool-import/dir-hasher.go b/src/pool-import/dir-hasher.go
new file mode 100644
index 0000000..6c1bf9b
--- /dev/null
+++ b/src/pool-import/dir-hasher.go
@@ -0,0 +1,105 @@
+//
+//  pool-import
+//
+//  Copyright (C) 2016 Christian Pointner <equinox@helsinki.at>
+//
+//  This file is part of pool-import.
+//
+//  pool-import is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  any later version.
+//
+//  pool-import is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with pool-import. If not, see <http://www.gnu.org/licenses/>.
+//
+
+package main
+
+import (
+	"log"
+	"math/rand"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+)
+
+type MusicDir struct {
+	root   string
+	stdlog *log.Logger
+	Files  map[string]string
+}
+
+func handleEntry(C chan<- string, path string, info os.FileInfo, err error, stdlog *log.Logger) error {
+	if err != nil {
+		return err
+	}
+	if info.IsDir() {
+		stdlog.Printf("entering directory: %s", path)
+		return nil
+	}
+	if !info.Mode().IsRegular() {
+		stdlog.Printf(" - skipping special file: %s", path)
+		return nil
+	}
+	// TODO: check file extensions
+	C <- path
+	return nil
+}
+
+func computeHash(file string) string {
+	time.Sleep(time.Duration(rand.Float64() * float64(5*time.Second))) // TODO: faking it is nice but the real hash would be nicer
+	return ""
+}
+
+func (d *MusicDir) collectHashes(C <-chan string, numThreads int) (wg *sync.WaitGroup) {
+	wg = &sync.WaitGroup{}
+
+	for i := 0; i < numThreads; i++ {
+		wg.Add(1)
+		d.stdlog.Printf("Starting hashing thread #%d", i)
+		go func(num int) {
+			defer wg.Done()
+			for {
+				file, ok := <-C
+				if !ok {
+					d.stdlog.Printf("Stopping hashing thread #%d", num)
+					return
+				}
+				d.stdlog.Printf(" - hashing: %s", file)
+				computeHash(file)
+			}
+		}(i)
+	}
+	return
+}
+
+func (d *MusicDir) ComputeHashes() (err error) {
+	C := make(chan string, 10)
+
+	wg := d.collectHashes(C, 4) // TODO: make number of hashing threads configurable
+
+	err = filepath.Walk(d.root, func(path string, info os.FileInfo, err error) error {
+		return handleEntry(C, path, info, err, d.stdlog)
+	})
+	close(C)
+
+	if err != nil {
+		return
+	}
+
+	wg.Wait()
+	return
+}
+
+func NewMusicDir(root string, stdlog *log.Logger) (dir *MusicDir) {
+	dir = &MusicDir{root: root, stdlog: stdlog}
+	dir.Files = make(map[string]string)
+	return
+}
diff --git a/src/pool-import/main.go b/src/pool-import/main.go
index a69c8cc..0a2ce7a 100644
--- a/src/pool-import/main.go
+++ b/src/pool-import/main.go
@@ -74,8 +74,8 @@ func main() {
 		stdlog.Fatalf("Error '%s' is not a pool group", group)
 	}
 
-	c := make(chan os.Signal, 1)
-	signal.Notify(c, os.Interrupt, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGTERM)
+	C := make(chan os.Signal, 1)
+	signal.Notify(C, os.Interrupt, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGTERM)
 
 	stdlog.Println("***************************************************************")
 	stdlog.Printf("*** will import into group '%s' from %d directories", group, len(directories))
@@ -90,5 +90,21 @@ func main() {
 	for _, cart := range carts {
 		stdlog.Printf(" %d: '%s' | %s / %s / %s)", cart.Number, cart.UserDefined, cart.Artist, cart.Album, cart.Title)
 	}
-	<-c
+
+	go func() {
+		defer func() {
+			C <- syscall.SIGTERM
+		}()
+
+		for _, root := range directories {
+			stdlog.Printf("hashing all the files in '%s'", root)
+			md := NewMusicDir(root, stdlog)
+			if err := md.ComputeHashes(); err != nil {
+				return
+			}
+		}
+		stdlog.Printf("all directires hashed")
+	}()
+
+	<-C
 }
-- 
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