[Qemu-devel] [PATCH v3 05/22] libqtest: Add a layer of abstraciton to send/recv

["Oleinik, Alexander" <alxndr@bu.edu>]

This makes it simple to swap the transport functions for qtest commands
to and from the qtest client. For example, now it is possible to
directly pass qtest commands to a server handler that exists within the
same process, without the standard way of writing to a file descriptor.

Signed-off-by: Alexander Oleinik <alxndr@bu.edu>
---
 tests/libqtest.c | 64 +++++++++++++++++++++++++++++++++++++++---------
 tests/libqtest.h |  1 -
 2 files changed, 53 insertions(+), 12 deletions(-)

diff --git a/tests/libqtest.c b/tests/libqtest.c
index 4a7556462d..19feea9e17 100644
--- a/tests/libqtest.c
+++ b/tests/libqtest.c
@@ -35,6 +35,15 @@
 #define SOCKET_TIMEOUT 50
 #define SOCKET_MAX_FDS 16
 
+
+typedef struct QTestClientTransportOps {
+    void     (*send)(void* , const char*, size_t);
+    void     *send_opaque;
+
+    GString* (*recv_line)(void *);
+    void     *recv_line_opaque;
+} QTestTransportOps;
+
 struct QTestState
 {
     int fd;
@@ -45,13 +54,28 @@ struct QTestState
     bool big_endian;
     bool irq_level[MAX_IRQ];
     GString *rx;
+    QTestTransportOps ops;
 };
 
 static GHookList abrt_hooks;
 static struct sigaction sigact_old;
+static GString *recv_str;
 
 static int qtest_query_target_endianness(QTestState *s);
 
+static void qtest_client_socket_send(void *opaque,
+        const char *buf, size_t size);
+static void socket_send(int fd, const char *buf, size_t size);
+
+static GString *qtest_client_socket_recv_line(void *);
+static GString *qtest_client_inproc_recv_line(void *);
+
+static void qtest_client_set_tx_handler(QTestState *s,
+        void (*send)(void *, const char *, size_t), void *opaque);
+static void qtest_client_set_rx_handler(QTestState *s,
+        GString * (*recv)(void *), void *opaque);
+
+
 static int init_socket(const char *socket_path)
 {
     struct sockaddr_un addr;
@@ -234,6 +258,9 @@ QTestState *qtest_init_without_qmp_handshake(const char *extra_args)
     sock = init_socket(socket_path);
     qmpsock = init_socket(qmp_socket_path);
 
+    qtest_client_set_rx_handler(s, qtest_client_socket_recv_line, s);
+    qtest_client_set_tx_handler(s, qtest_client_socket_send, &(s->fd));
+
     qtest_add_abrt_handler(kill_qemu_hook_func, s);
 
     command = g_strdup_printf("exec %s "
@@ -360,8 +387,9 @@ void qtest_quit(QTestState *s)
     g_free(s);
 }
 
-static void socket_send(int fd, const char *buf, size_t size)
+static void qtest_client_socket_send(void *opaque, const char *buf, size_t size)
 {
+    int fd = *((int *)opaque);
     size_t offset;
 
     offset = 0;
@@ -379,22 +407,22 @@ static void socket_send(int fd, const char *buf, size_t size)
     }
 }
 
-static void socket_sendf(int fd, const char *fmt, va_list ap)
+static void socket_send(int fd, const char *buf, size_t size)
 {
-    gchar *str = g_strdup_vprintf(fmt, ap);
-    size_t size = strlen(str);
-
-    socket_send(fd, str, size);
-    g_free(str);
+    qtest_client_socket_send(&fd, buf, size);
 }
 
 static void GCC_FMT_ATTR(2, 3) qtest_sendf(QTestState *s, const char *fmt, ...)
 {
     va_list ap;
-
     va_start(ap, fmt);
-    socket_sendf(s->fd, fmt, ap);
+    gchar *str = g_strdup_vprintf(fmt, ap);
     va_end(ap);
+
+    size_t size = strlen(str);
+
+    s->ops.send(s, str, size);
+    g_free(str);
 }
 
 /* Sends a message and file descriptors to the socket.
@@ -431,8 +459,9 @@ static void socket_send_fds(int socket_fd, int *fds, size_t fds_num,
     g_assert_cmpint(ret, >, 0);
 }
 
-static GString *qtest_recv_line(QTestState *s)
+static GString *qtest_client_socket_recv_line(void* opaque)
 {
+    QTestState *s = opaque;
     GString *line;
     size_t offset;
     char *eol;
@@ -468,7 +497,7 @@ static gchar **qtest_rsp(QTestState *s, int expected_args)
     int i;
 
 redo:
-    line = qtest_recv_line(s);
+    line = s->ops.recv_line(s->ops.recv_line_opaque);
     words = g_strsplit(line->str, " ", 0);
     g_string_free(line, TRUE);
 
@@ -1327,3 +1356,16 @@ void qmp_assert_error_class(QDict *rsp, const char *class)
 
     qobject_unref(rsp);
 }
+
+static void qtest_client_set_tx_handler(QTestState *s,
+                    void (*send)(void*, const char*, size_t), void *opaque)
+{
+    s->ops.send = send;
+    s->ops.send_opaque = opaque;
+}
+static void qtest_client_set_rx_handler(QTestState *s,
+                    GString* (*recv)(void *), void *opaque)
+{
+    s->ops.recv_line = recv;
+    s->ops.recv_line_opaque = opaque;
+}
diff --git a/tests/libqtest.h b/tests/libqtest.h
index a177e502d9..40fa235a52 100644
--- a/tests/libqtest.h
+++ b/tests/libqtest.h
@@ -716,5 +716,4 @@ bool qtest_probe_child(QTestState *s);
  * Set expected exit status of the child.
  */
 void qtest_set_expected_status(QTestState *s, int status);
-
 #endif
-- 
2.23.0