lib: add wpipc library

Simple library that uses sockets for inter-process communication. It provides an
API to create server and client objects. Users can add custom handlers in the
server, and clients can send requests for those custom handlers.

Signed-off-by: George Kiagiadakis <george.kiagiadakis@collabora.com>

1 files changed, 124 insertions, 0 deletions

diff --git a/tests/client-server.c b/tests/client-server.c
new file mode 100644
index 0000000..ca6d1c3
--- /dev/null
+++ b/tests/client-server.c
@@ -0,0 +1,124 @@
+/* PipeWire AGL Cluster IPC
+ *
+ * Copyright © 2021 Collabora Ltd.
+ *    @author Julian Bouzas <julian.bouzas@collabora.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <glib.h>
+#include <spa/pod/builder.h>
+#include <spa/pod/parser.h>
+#include <icipc/icipc.h>
+
+#define TEST_ADDRESS "/tmp/icipc-client-server"
+
+static bool
+increment_request_handler (struct icipc_server *self, int client_fd,
+    const char *name, const struct spa_pod *args, void *data)
+{
+  int32_t val = 0;
+  g_assert_true (spa_pod_is_int (args));
+  g_assert_true (spa_pod_get_int (args, &val) == 0);
+  struct spa_pod_int res = SPA_POD_INIT_Int (val + 1);
+  return icipc_server_reply_ok (self, client_fd, (struct spa_pod *)&res);
+}
+
+static bool
+error_request_handler (struct icipc_server *self, int client_fd,
+    const char *name, const struct spa_pod *args, void *data)
+{
+  return icipc_server_reply_error (self, client_fd, "error message");
+}
+
+struct reply_data {
+  int32_t incremented;
+  const char *error;
+  int n_replies;
+  GMutex mutex;
+};
+
+static void
+wait_for_reply (struct reply_data *data, int n_replies)
+{
+  while (true) {
+    g_mutex_lock (&data->mutex);
+    if (data->n_replies == n_replies) {
+      g_mutex_unlock (&data->mutex);
+      break;
+    }
+    g_mutex_unlock (&data->mutex);
+  }
+}
+
+static void
+reply_handler (struct icipc_sender *self, const uint8_t *buffer, size_t size, void *p)
+{
+  struct reply_data *data = p;
+  g_assert_nonnull (data);
+
+  g_mutex_lock (&data->mutex);
+
+  const struct spa_pod *pod = icipc_client_send_request_finish (self, buffer, size, &data->error);
+  if (pod) {
+    g_assert_true (spa_pod_is_int (pod));
+    g_assert_true (spa_pod_get_int (pod, &data->incremented) == 0);
+  }
+  data->n_replies++;
+
+  g_mutex_unlock (&data->mutex);
+}
+
+static void
+test_icipc_server_client ()
+{
+  struct icipc_server *s = icipc_server_new (TEST_ADDRESS, true);
+  g_assert_nonnull (s);
+  struct icipc_client *c = icipc_client_new (TEST_ADDRESS, true);
+  g_assert_nonnull (c);
+  struct reply_data data;
+  g_mutex_init (&data.mutex);
+
+  /* add request handlers */
+  g_assert_true (icipc_server_set_request_handler (s, "INCREMENT", increment_request_handler, NULL));
+  g_assert_true (icipc_server_set_request_handler (s, "ERROR", error_request_handler, NULL));
+
+  /* send an INCREMENT request of 3, and make sure the returned value is 4 */
+  data.incremented = -1;
+  data.error = NULL;
+  data.n_replies = 0;
+  struct spa_pod_int i = SPA_POD_INIT_Int (3);
+  g_assert_true (icipc_client_send_request (c, "INCREMENT", (struct spa_pod *)&i, reply_handler, &data));
+  wait_for_reply (&data, 1);
+  g_assert_null (data.error);
+  g_assert_cmpint (data.incremented, ==, 4);
+
+  /* send an ERROR request, and make sure the returned value is an error */
+  data.error = NULL;
+  data.n_replies = 0;
+  g_assert_true (icipc_client_send_request (c, "ERROR", NULL, reply_handler, &data));
+  wait_for_reply (&data, 1);
+  g_assert_cmpstr (data.error, ==, "error message");
+
+  /* send an unhandled request, and make sure the server replies with an error */
+  data.error = NULL;
+  data.n_replies = 0;
+  g_assert_true (icipc_client_send_request (c, "UNHANDLED-REQUEST", NULL, reply_handler, &data));
+  wait_for_reply (&data, 1);
+  g_assert_cmpstr (data.error, ==, "request handler not found");
+
+  /* clean up */
+  g_mutex_clear (&data.mutex);
+  icipc_client_free (c);
+  icipc_server_free (s);
+}
+
+gint
+main (gint argc, gchar *argv[])
+{
+  g_test_init (&argc, &argv, NULL);
+
+  g_test_add_func ("/icipc/icipc-server-client", test_icipc_server_client);
+
+  return g_test_run ();
+}