From d4dbb47ac776471eb8a9f91a97da40b9b6621a74 Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fischer@muhq.space>
Date: Sun, 21 May 2023 14:44:33 +0200
Subject: paralyze searching

---
 TODO      |  4 +++-
 main.go   | 12 +++++++++++-
 player.go | 23 +++++++++++++++++++----
 wrms.go   |  1 -
 4 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/TODO b/TODO
index 4e33df8..ed29307 100644
--- a/TODO
+++ b/TODO
@@ -1,4 +1,5 @@
 ## Fronted
+- [ ] support incremental search results
 
 ## Web Backend
 
@@ -6,7 +7,8 @@
 
 ## Backends
 
-- [ ] Split paralyze search
+- [X] paralyze search
+  - [ ] report results incrementally
 - [X] Implement local storage backend
   - [X] Implement upload
     - [ ] Remove uploaded songs after were played
diff --git a/main.go b/main.go
index 420ade8..94e11b9 100644
--- a/main.go
+++ b/main.go
@@ -9,6 +9,7 @@ import (
 	"io/ioutil"
 	"net/http"
 	"strings"
+	"time"
 
 	"muhq.space/go/wrms/llog"
 
@@ -36,7 +37,16 @@ func searchHandler(w http.ResponseWriter, r *http.Request) {
 
 	llog.Debug("Searching for %s", pattern)
 
-	results := wrms.Player.Search(pattern)
+	start := time.Now()
+	resultsChan := wrms.Player.Search(pattern)
+	results := []Song{}
+
+	for result := range resultsChan {
+		results = append(results, result...)
+	}
+
+	llog.Debug("searching for %s took %v", pattern, time.Since(start))
+
 	data, err := json.Marshal(Event{"search", results})
 	if err != nil {
 		llog.Error("Encoding the search result failed with %s", err)
diff --git a/player.go b/player.go
index 3cee6b4..b4a9dc6 100644
--- a/player.go
+++ b/player.go
@@ -3,6 +3,7 @@ package main
 import (
 	"io"
 	"os/exec"
+	"sync"
 	"syscall"
 
 	"muhq.space/go/wrms/llog"
@@ -110,10 +111,24 @@ func (player *Player) Pause() {
 	}
 }
 
-func (player *Player) Search(pattern string) []Song {
-	results := []Song{}
+func (player *Player) Search(pattern string) chan []Song {
+	var wg sync.WaitGroup
+	wg.Add(len(player.Backends))
+
+	ch := make(chan []Song)
+
 	for _, backend := range player.Backends {
-		results = append(results, backend.Search(pattern)...)
+		backend := backend
+		go func() {
+			ch <- backend.Search(pattern)
+			wg.Done()
+		}()
 	}
-	return results
+
+	go func() {
+		wg.Wait()
+		close(ch)
+	}()
+
+	return ch
 }
diff --git a/wrms.go b/wrms.go
index 9a334c3..9cd0ac4 100644
--- a/wrms.go
+++ b/wrms.go
@@ -112,7 +112,6 @@ func (wrms *Wrms) Next() {
 	}
 
 	wrms.CurrentSong = *next
-
 }
 
 func (wrms *Wrms) PlayPause() {
-- 
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