simple-ipc: preparations for supporting binary messages.

Add `command_len` argument to the Simple IPC API.

In my original Simple IPC API, I assumed that the request would always
be a null-terminated string of text characters.  The `command`
argument was just a `const char *`.

I found a caller that would like to pass a binary command to the
daemon, so I am amending the Simple IPC API to receive `const char
*command, size_t command_len` arguments.

I considered changing the `command` argument to be a `void *`, but the
IPC layer simply passes it to the pkt-line layer which takes a `const
char *`, so to avoid confusion I left it as is.

Note, the response side has always been a `struct strbuf` which
includes the buffer and length, so we already support returning a
binary answer.  (Yes, it feels a little weird returning a binary
buffer in a `strbuf`, but it works.)

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/compat/simple-ipc/ipc-unix-socket.c b/compat/simple-ipc/ipc-unix-socket.c
index 1927e6ef4b..4e28857a0a 100644
--- a/compat/simple-ipc/ipc-unix-socket.c
+++ b/compat/simple-ipc/ipc-unix-socket.c
@@ -168,7 +168,8 @@ void ipc_client_close_connection(struct ipc_client_connection *connection)
 
 int ipc_client_send_command_to_connection(
 	struct ipc_client_connection *connection,
-	const char *message, struct strbuf *answer)
+	const char *message, size_t message_len,
+	struct strbuf *answer)
 {
 	int ret = 0;
 
@@ -176,7 +177,7 @@ int ipc_client_send_command_to_connection(
 
 	trace2_region_enter("ipc-client", "send-command", NULL);
 
-	if (write_packetized_from_buf_no_flush(message, strlen(message),
+	if (write_packetized_from_buf_no_flush(message, message_len,
 					       connection->fd) < 0 ||
 	    packet_flush_gently(connection->fd) < 0) {
 		ret = error(_("could not send IPC command"));
@@ -197,7 +198,8 @@ done:
 
 int ipc_client_send_command(const char *path,
 			    const struct ipc_client_connect_options *options,
-			    const char *message, struct strbuf *answer)
+			    const char *message, size_t message_len,
+			    struct strbuf *answer)
 {
 	int ret = -1;
 	enum ipc_active_state state;
@@ -208,7 +210,9 @@ int ipc_client_send_command(const char *path,
 	if (state != IPC_STATE__LISTENING)
 		return ret;
 
-	ret = ipc_client_send_command_to_connection(connection, message, answer);
+	ret = ipc_client_send_command_to_connection(connection,
+						    message, message_len,
+						    answer);
 
 	ipc_client_close_connection(connection);
 
@@ -503,7 +507,7 @@ static int worker_thread__do_io(
 	if (ret >= 0) {
 		ret = worker_thread_data->server_data->application_cb(
 			worker_thread_data->server_data->application_data,
-			buf.buf, do_io_reply_callback, &reply_data);
+			buf.buf, buf.len, do_io_reply_callback, &reply_data);
 
 		packet_flush_gently(reply_data.fd);
 	}