From f26a501251906bec3ffe5100f40813a271f22f8e Mon Sep 17 00:00:00 2001
From: Eric Anderson <ejona@google.com>
Date: Thu, 17 Dec 2020 15:48:34 -0800
Subject: [PATCH] Authority isn't the only thing called before start

---
 .../java/io/grpc/internal/DelayedStream.java  | 34 +++++++++++--------
 .../io/grpc/internal/DelayedStreamTest.java   |  2 +-
 2 files changed, 21 insertions(+), 15 deletions(-)

diff --git a/core/src/main/java/io/grpc/internal/DelayedStream.java b/core/src/main/java/io/grpc/internal/DelayedStream.java
index 0eb6b80c3666..e5926d0cb50b 100644
--- a/core/src/main/java/io/grpc/internal/DelayedStream.java
+++ b/core/src/main/java/io/grpc/internal/DelayedStream.java
@@ -60,12 +60,8 @@ class DelayedStream implements ClientStream {
   private long startTimeNanos;
   @GuardedBy("this")
   private long streamSetTimeNanos;
-
-  // start()-related storage. All references should be cleared after start() is called on realStream
-  // to avoid retaining the objects for the life of the call
-  /** non-null when setAuthority needs to be called on realStream when it is set. */
   // No need to synchronize; start() synchronization provides a happens-before
-  private String startAuthority;
+  private List<Runnable> preStartPendingCalls = new ArrayList<>();
 
   @Override
   public void setMaxInboundMessageSize(final int maxSize) {
@@ -97,7 +93,8 @@ public void run() {
 
   @Override
   public void setDeadline(final Deadline deadline) {
-    delayOrExecute(new Runnable() {
+    checkState(listener == null, "May only be called before start");
+    preStartPendingCalls.add(new Runnable() {
       @Override
       public void run() {
         realStream.setDeadline(deadline);
@@ -211,7 +208,12 @@ private void delayOrExecute(Runnable runnable) {
   public void setAuthority(final String authority) {
     checkState(listener == null, "May only be called before start");
     checkNotNull(authority, "authority");
-    this.startAuthority = authority;
+    preStartPendingCalls.add(new Runnable() {
+      @Override
+      public void run() {
+        realStream.setAuthority(authority);
+      }
+    });
   }
 
   @Override
@@ -246,10 +248,10 @@ public void start(ClientStreamListener listener) {
    * #listener}.
    */
   private void internalStart(ClientStreamListener listener) {
-    if (startAuthority != null) {
-      realStream.setAuthority(startAuthority);
-      startAuthority = null;
+    for (Runnable runnable : preStartPendingCalls) {
+      runnable.run();
     }
+    preStartPendingCalls = null;
     realStream.start(listener);
   }
 
@@ -360,7 +362,8 @@ public void run() {
 
   @Override
   public void optimizeForDirectExecutor() {
-    delayOrExecute(new Runnable() {
+    checkState(listener == null, "May only be called before start");
+    preStartPendingCalls.add(new Runnable() {
       @Override
       public void run() {
         realStream.optimizeForDirectExecutor();
@@ -370,8 +373,9 @@ public void run() {
 
   @Override
   public void setCompressor(final Compressor compressor) {
+    checkState(listener == null, "May only be called before start");
     checkNotNull(compressor, "compressor");
-    delayOrExecute(new Runnable() {
+    preStartPendingCalls.add(new Runnable() {
       @Override
       public void run() {
         realStream.setCompressor(compressor);
@@ -381,7 +385,8 @@ public void run() {
 
   @Override
   public void setFullStreamDecompression(final boolean fullStreamDecompression) {
-    delayOrExecute(
+    checkState(listener == null, "May only be called before start");
+    preStartPendingCalls.add(
         new Runnable() {
           @Override
           public void run() {
@@ -392,8 +397,9 @@ public void run() {
 
   @Override
   public void setDecompressorRegistry(final DecompressorRegistry decompressorRegistry) {
+    checkState(listener == null, "May only be called before start");
     checkNotNull(decompressorRegistry, "decompressorRegistry");
-    delayOrExecute(new Runnable() {
+    preStartPendingCalls.add(new Runnable() {
       @Override
       public void run() {
         realStream.setDecompressorRegistry(decompressorRegistry);
diff --git a/core/src/test/java/io/grpc/internal/DelayedStreamTest.java b/core/src/test/java/io/grpc/internal/DelayedStreamTest.java
index 8fb42c48fb52..fc0daed28133 100644
--- a/core/src/test/java/io/grpc/internal/DelayedStreamTest.java
+++ b/core/src/test/java/io/grpc/internal/DelayedStreamTest.java
@@ -92,9 +92,9 @@ public void start_afterStart() {
 
   @Test
   public void setStream_sendsAllMessages() {
-    stream.start(listener);
     stream.setCompressor(Codec.Identity.NONE);
     stream.setDecompressorRegistry(DecompressorRegistry.getDefaultInstance());
+    stream.start(listener);
 
     stream.setMessageCompression(true);
     InputStream message = new ByteArrayInputStream(new byte[]{'a'});