[glib] Add tests for {read,write}_all_async()

[Ryan Lortie <desrt src gnome org>]

commit b768d0e4eaf15934067557cfee6b8beebca5df42
Author: Ryan Lortie <desrt desrt ca>
Date:   Tue Oct 21 11:30:47 2014 -0400

    Add tests for {read,write}_all_async()
    
    https://bugzilla.gnome.org/show_bug.cgi?id=737451

 gio/tests/.gitignore      |    1 +
 gio/tests/Makefile.am     |    1 +
 gio/tests/stream-rw_all.c |  258 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 260 insertions(+), 0 deletions(-)
---
diff --git a/gio/tests/.gitignore b/gio/tests/.gitignore
index 302d694..c64f610 100644
--- a/gio/tests/.gitignore
+++ b/gio/tests/.gitignore
@@ -112,6 +112,7 @@ services/org.gtk.GDBus.Examples.ObjectManager.service
 simple-async-result
 simple-proxy
 sleepy-stream
+stream-rw_all
 socket
 socket-address
 socket-client
diff --git a/gio/tests/Makefile.am b/gio/tests/Makefile.am
index 4bb71a8..fd834e6 100644
--- a/gio/tests/Makefile.am
+++ b/gio/tests/Makefile.am
@@ -241,6 +241,7 @@ test_programs += \
        gdbus-peer-object-manager               \
        live-g-file                             \
        socket-address                          \
+       stream-rw_all                           \
        unix-fd                                 \
        unix-streams                            \
        $(NULL)
diff --git a/gio/tests/stream-rw_all.c b/gio/tests/stream-rw_all.c
new file mode 100644
index 0000000..5e0dfe4
--- /dev/null
+++ b/gio/tests/stream-rw_all.c
@@ -0,0 +1,258 @@
+/*
+ * Copyright © 2014 Canonical Limited
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2 of the licence or (at
+ * your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Ryan Lortie <desrt desrt ca>
+ */
+
+#include <gio/gio.h>
+#include <string.h>
+
+static gboolean expected_read_success;
+static guint    expected_read;
+static gboolean got_read_done;
+
+static void
+read_done (GObject      *source,
+           GAsyncResult *result,
+           gpointer      user_data)
+{
+  gboolean success;
+  gsize read;
+
+  success = g_input_stream_read_all_finish (G_INPUT_STREAM (source), result, &read, NULL);
+  g_assert_cmpint (expected_read_success, ==, success);
+  g_assert_cmpint (expected_read, ==, read);
+  got_read_done = TRUE;
+}
+
+static void
+wait_for_read (gboolean success,
+               gsize    read)
+{
+  g_assert (!got_read_done);
+  expected_read_success = success;
+  expected_read = read;
+
+  while (!got_read_done)
+    g_main_context_iteration (NULL, TRUE);
+
+  got_read_done = FALSE;
+}
+
+static gboolean expected_write_success;
+static guint    expected_written;
+static gboolean got_write_done;
+
+static void
+write_done (GObject      *source,
+            GAsyncResult *result,
+            gpointer      user_data)
+{
+  gboolean success;
+  gsize written;
+
+  success = g_output_stream_write_all_finish (G_OUTPUT_STREAM (source), result, &written, NULL);
+  g_assert_cmpint (expected_write_success, ==, success);
+  g_assert_cmpint (expected_written, ==, written);
+  got_write_done = TRUE;
+}
+
+static void
+wait_for_write (gboolean success,
+                gsize    written)
+{
+  g_assert (!got_write_done);
+  expected_write_success = success;
+  expected_written = written;
+
+  while (!got_write_done)
+    g_main_context_iteration (NULL, TRUE);
+
+  got_write_done = FALSE;
+}
+
+static void
+test_write_all_async_memory (void)
+{
+  GOutputStream *ms;
+  gchar b[24];
+
+  ms = g_memory_output_stream_new (b, sizeof b, NULL, NULL);
+
+  g_output_stream_write_all_async (ms, "0123456789", 10, 0, NULL, write_done, NULL);
+  wait_for_write (TRUE, 10);
+
+  g_output_stream_write_all_async (ms, "0123456789", 10, 0, NULL, write_done, NULL);
+  wait_for_write (TRUE, 10);
+
+  /* this will trigger an out-of-space error, but we will see the
+   * partial write...
+   */
+  g_output_stream_write_all_async (ms, "0123456789", 10, 0, NULL, write_done, NULL);
+  wait_for_write (FALSE, 4);
+
+  /* and still an error, but no further bytes written */
+  g_output_stream_write_all_async (ms, "0123456789", 10, 0, NULL, write_done, NULL);
+  wait_for_write (FALSE, 0);
+
+  g_assert (!memcmp (b, "012345678901234567890123", 24));
+
+  g_object_unref (ms);
+}
+
+static void
+test_read_all_async_memory (void)
+{
+  GInputStream *ms;
+  gchar b[24] = "0123456789ABCDEFGHIJ! #$";
+  gchar buf[10];
+
+  ms = g_memory_input_stream_new_from_data (b, sizeof b, NULL);
+
+  g_input_stream_read_all_async (ms, buf, 10, 0, NULL, read_done, NULL);
+  wait_for_read (TRUE, 10);
+  g_assert (!memcmp (buf, "0123456789", 10));
+
+  g_input_stream_read_all_async (ms, buf, 10, 0, NULL, read_done, NULL);
+  wait_for_read (TRUE, 10);
+  g_assert (!memcmp (buf, "ABCDEFGHIJ", 10));
+
+  /* partial read... */
+  g_input_stream_read_all_async (ms, buf, 10, 0, NULL, read_done, NULL);
+  wait_for_read (TRUE, 4);
+  g_assert (!memcmp (buf, "! #$", 4));
+
+  /* EOF */
+  g_input_stream_read_all_async (ms, buf, 10, 0, NULL, read_done, NULL);
+  wait_for_read (TRUE, 0);
+
+  g_object_unref (ms);
+}
+
+#ifdef G_OS_UNIX
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <gio/gunixinputstream.h>
+#include <gio/gunixoutputstream.h>
+
+static void
+test_read_write_all_async_pipe (void)
+{
+  GCancellable *cancellable;
+  GError *error = NULL;
+  GOutputStream *out;
+  GInputStream *in;
+  gsize in_flight;
+  gsize s;
+  gchar wbuf[100] = { 0, };
+  gchar rbuf[100];
+
+  {
+    gint sv[2];
+    gint s;
+
+    s = socketpair (AF_UNIX, SOCK_STREAM, 0, sv);
+    g_assert (s == 0);
+
+    out = g_unix_output_stream_new (sv[0], TRUE);
+    in = g_unix_input_stream_new (sv[1], TRUE);
+  }
+
+  /* Try to fill up the buffer */
+  in_flight = 0;
+  while (g_pollable_output_stream_is_writable (G_POLLABLE_OUTPUT_STREAM (out)))
+    {
+      s = g_output_stream_write (out, wbuf, sizeof wbuf, NULL, &error);
+      g_assert_no_error (error);
+      g_assert (s > 0);
+      in_flight += s;
+    }
+
+  /* Now start a blocking write_all; nothing should happen. */
+  cancellable = g_cancellable_new ();
+  g_output_stream_write_all_async (out, "0123456789", 10, 0, cancellable, write_done, NULL);
+  while (g_main_context_iteration (NULL, FALSE))
+    ;
+  g_assert (!got_write_done);
+
+  /* Cancel that to make sure it works */
+  g_cancellable_cancel (cancellable);
+  g_object_unref (cancellable);
+  wait_for_write (FALSE, 0);
+
+  /* Start it again */
+  g_output_stream_write_all_async (out, "0123456789", 10, 0, NULL, write_done, NULL);
+  while (g_main_context_iteration (NULL, FALSE))
+    ;
+  g_assert (!got_write_done);
+
+  /* Now drain as much as we originally put in the buffer to make it
+   * block -- this will unblock the writer.
+   */
+  while (in_flight)
+    {
+      s = g_input_stream_read (in, rbuf, MIN (sizeof wbuf, in_flight), NULL, &error);
+      g_assert_no_error (error);
+      g_assert (s > 0);
+      in_flight -= s;
+    }
+
+  /* That will have caused some writing to start happening.  Do a
+   * read_all as well, for more bytes than was written.
+   */
+  g_input_stream_read_all_async (in, rbuf, sizeof rbuf, 0, NULL, read_done, NULL);
+
+  /* The write is surely finished by now */
+  wait_for_write (TRUE, 10);
+  /* ...but the read will not yet be satisfied */
+  g_assert (!got_read_done);
+
+  /* Feed the read more than it asked for; this really should not block
+   * since the buffer is so small...
+   */
+  g_output_stream_write_all (out, wbuf, sizeof wbuf, 0, NULL, &error);
+  g_assert_no_error (error);
+
+  /* Read will have finished now */
+  wait_for_read (TRUE, sizeof rbuf);
+
+  /* Close the writer end to make an EOF condition */
+  g_output_stream_close (out, NULL, NULL);
+
+  /* ... and we should have exactly 10 extra bytes left in the buffer */
+  g_input_stream_read_all_async (in, rbuf, sizeof rbuf, 0, NULL, read_done, NULL);
+  wait_for_read (TRUE, 10);
+
+  g_object_unref (out);
+  g_object_unref (in);
+}
+#endif
+
+int
+main (int    argc,
+      char **argv)
+{
+  g_test_init (&argc, &argv, NULL);
+
+  g_test_add_func ("/stream/read_all_async/memory", test_read_all_async_memory);
+  g_test_add_func ("/stream/write_all_async/memory", test_write_all_async_memory);
+#ifdef G_OS_UNIX
+  g_test_add_func ("/stream/read_write_all_async/pipe", test_read_write_all_async_pipe);
+#endif
+
+  return g_test_run();
+}