read logs based on length instead of null

Author: qimiko

app/src/main/java/com/geode/launcher/log/LogLine.kt

@@ -5,6 +5,7 @@ import kotlinx.datetime.Instant
 import kotlinx.datetime.TimeZone
 import kotlinx.datetime.toJavaInstant
 import kotlinx.datetime.toLocalDateTime
+import okio.Buffer
 import okio.BufferedSource
 import java.io.IOException
 
@@ -161,7 +162,7 @@ data class LogLine(
                 };
             */
 
-            /* val payloadLength = */ source.readShortLe()
+            val payloadLength = source.readShortLe().toLong()
             val headerSize = source.readShortLe().toUShort()
 
             val entryVersion = headerSizeToVersion(headerSize)
@@ -177,11 +178,17 @@ data class LogLine(
             val processInformation = ProcessInformation(pid, tid, uid)
             val time = Instant.fromEpochSeconds(sec, nSec)
 
-            val priorityByte = source.readByte()
+            // the payload is split into three parts
+            // initial priority byte -> null terminated tag -> non null terminated message
+
+            val packetBuffer = Buffer()
+            source.readFully(packetBuffer, payloadLength)
+
+            val priorityByte = packetBuffer.readByte()
             val priority = LogPriority.fromByte(priorityByte)
 
-            val tag = source.readCString()
-            val message = source.readCString()
+            val tag = packetBuffer.readCString()
+            val message = packetBuffer.readUtf8()
 
             return LogLine(
                 process = processInformation,

app/src/main/java/com/geode/launcher/log/LogViewModel.kt

@@ -9,7 +9,9 @@ import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import kotlinx.coroutines.yield
+import okio.Buffer
 import okio.buffer
 import okio.source
 import java.io.EOFException
@@ -61,7 +63,9 @@ class LogViewModel: ViewModel() {
             else "logcat -B -d"
 
         val logProcess = try {
-            Runtime.getRuntime().exec(logCommand)
+            withContext(Dispatchers.IO) {
+                Runtime.getRuntime().exec(logCommand)
+            }
         } catch (ioe: IOException) {
             ioe.printStackTrace()
             logLines += LogLine.showException(ioe)
@@ -71,13 +75,15 @@ class LogViewModel: ViewModel() {
             return logLines
         }
 
-        val logSource = logProcess.inputStream.source().buffer()
+        // read entire log into a buffer so no logs are added to the buffer during processing
+        val logBuffer = Buffer()
+        logProcess.inputStream.source().buffer().readAll(logBuffer)
 
         try {
             coroutineScope {
                 // this runs until the stream is exhausted
                 while (true) {
-                    val line = LogLine.fromBufferedSource(logSource)
+                    val line = LogLine.fromBufferedSource(logBuffer)
 
                     if (line.priority >= logLevel) {
                         logLines += line