From 5a143c9855a7f1c9bcfb51a62b63f7627f867897 Mon Sep 17 00:00:00 2001
From: LoveSy <shana@zju.edu.cn>
Date: Sat, 9 Apr 2022 18:56:52 +0800
Subject: [PATCH] Log LRU (#1822)
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Co-authored-by: 残页 <31466456+canyie@users.noreply.github.com>
---
 .../lsposed/lspd/service/LogcatService.java   | 36 +++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/daemon/src/main/java/org/lsposed/lspd/service/LogcatService.java b/daemon/src/main/java/org/lsposed/lspd/service/LogcatService.java
index 84eaff6a3..6f6157987 100644
--- a/daemon/src/main/java/org/lsposed/lspd/service/LogcatService.java
+++ b/daemon/src/main/java/org/lsposed/lspd/service/LogcatService.java
@@ -14,6 +14,7 @@
 import java.nio.file.LinkOption;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.LinkedHashMap;
 
 public class LogcatService implements Runnable {
     private static final String TAG = "LSPosedLogcat";
@@ -25,6 +26,28 @@ public class LogcatService implements Runnable {
     private int verboseFd = -1;
     private Thread thread = null;
 
+    static class LogLRU extends LinkedHashMap<File, Object> {
+        private static final int MAX_ENTRIES = 10;
+
+        public LogLRU() {
+            super(MAX_ENTRIES, 1f, false);
+        }
+
+        @Override
+        synchronized protected boolean removeEldestEntry(Entry<File, Object> eldest) {
+            if (size() > MAX_ENTRIES && eldest.getKey().delete()) {
+                Log.d(TAG, "Deleted old log " + eldest.getKey().getAbsolutePath());
+                return true;
+            }
+            return false;
+        }
+    }
+
+    @SuppressWarnings("MismatchedQueryAndUpdateOfCollection")
+    private final LinkedHashMap<File, Object> moduleLogs = new LogLRU();
+    @SuppressWarnings("MismatchedQueryAndUpdateOfCollection")
+    private final LinkedHashMap<File, Object> verboseLogs = new LogLRU();
+
     @SuppressLint("UnsafeDynamicallyLoadedCode")
     public LogcatService() {
         String libraryPath = System.getProperty("lsp.library.path");
@@ -89,8 +112,17 @@ private int refreshFd(boolean isVerboseLog) {
             Log.i(TAG, "New log file: " + log);
             ConfigFileManager.chattr0(log.toPath().getParent());
             int fd = ParcelFileDescriptor.open(log, mode).detachFd();
-            if (isVerboseLog) verboseFd = fd;
-            else modulesFd = fd;
+            if (isVerboseLog) {
+                synchronized (verboseLogs) {
+                    verboseLogs.put(log, new Object());
+                }
+                verboseFd = fd;
+            } else {
+                synchronized (moduleLogs) {
+                    moduleLogs.put(log, new Object());
+                }
+                modulesFd = fd;
+            }
             return fd;
         } catch (IOException e) {
             if (isVerboseLog) verboseFd = -1;