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-rw-r--r--fsmonitor-ipc.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/fsmonitor-ipc.c b/fsmonitor-ipc.c
new file mode 100644
index 0000000..19d772f
--- /dev/null
+++ b/fsmonitor-ipc.c
@@ -0,0 +1,173 @@
+#include "cache.h"
+#include "fsmonitor.h"
+#include "simple-ipc.h"
+#include "fsmonitor-ipc.h"
+#include "run-command.h"
+#include "strbuf.h"
+#include "trace2.h"
+
+#ifndef HAVE_FSMONITOR_DAEMON_BACKEND
+
+/*
+ * A trivial implementation of the fsmonitor_ipc__ API for unsupported
+ * platforms.
+ */
+
+int fsmonitor_ipc__is_supported(void)
+{
+ return 0;
+}
+
+const char *fsmonitor_ipc__get_path(struct repository *r)
+{
+ return NULL;
+}
+
+enum ipc_active_state fsmonitor_ipc__get_state(void)
+{
+ return IPC_STATE__OTHER_ERROR;
+}
+
+int fsmonitor_ipc__send_query(const char *since_token,
+ struct strbuf *answer)
+{
+ return -1;
+}
+
+int fsmonitor_ipc__send_command(const char *command,
+ struct strbuf *answer)
+{
+ return -1;
+}
+
+#else
+
+int fsmonitor_ipc__is_supported(void)
+{
+ return 1;
+}
+
+enum ipc_active_state fsmonitor_ipc__get_state(void)
+{
+ return ipc_get_active_state(fsmonitor_ipc__get_path(the_repository));
+}
+
+static int spawn_daemon(void)
+{
+ struct child_process cmd = CHILD_PROCESS_INIT;
+
+ cmd.git_cmd = 1;
+ cmd.no_stdin = 1;
+ cmd.trace2_child_class = "fsmonitor";
+ strvec_pushl(&cmd.args, "fsmonitor--daemon", "start", NULL);
+
+ return run_command(&cmd);
+}
+
+int fsmonitor_ipc__send_query(const char *since_token,
+ struct strbuf *answer)
+{
+ int ret = -1;
+ int tried_to_spawn = 0;
+ enum ipc_active_state state = IPC_STATE__OTHER_ERROR;
+ struct ipc_client_connection *connection = NULL;
+ struct ipc_client_connect_options options
+ = IPC_CLIENT_CONNECT_OPTIONS_INIT;
+ const char *tok = since_token ? since_token : "";
+ size_t tok_len = since_token ? strlen(since_token) : 0;
+
+ options.wait_if_busy = 1;
+ options.wait_if_not_found = 0;
+
+ trace2_region_enter("fsm_client", "query", NULL);
+ trace2_data_string("fsm_client", NULL, "query/command", tok);
+
+try_again:
+ state = ipc_client_try_connect(fsmonitor_ipc__get_path(the_repository),
+ &options, &connection);
+
+ switch (state) {
+ case IPC_STATE__LISTENING:
+ ret = ipc_client_send_command_to_connection(
+ connection, tok, tok_len, answer);
+ ipc_client_close_connection(connection);
+
+ trace2_data_intmax("fsm_client", NULL,
+ "query/response-length", answer->len);
+ goto done;
+
+ case IPC_STATE__NOT_LISTENING:
+ case IPC_STATE__PATH_NOT_FOUND:
+ if (tried_to_spawn)
+ goto done;
+
+ tried_to_spawn++;
+ if (spawn_daemon())
+ goto done;
+
+ /*
+ * Try again, but this time give the daemon a chance to
+ * actually create the pipe/socket.
+ *
+ * Granted, the daemon just started so it can't possibly have
+ * any FS cached yet, so we'll always get a trivial answer.
+ * BUT the answer should include a new token that can serve
+ * as the basis for subsequent requests.
+ */
+ options.wait_if_not_found = 1;
+ goto try_again;
+
+ case IPC_STATE__INVALID_PATH:
+ ret = error(_("fsmonitor_ipc__send_query: invalid path '%s'"),
+ fsmonitor_ipc__get_path(the_repository));
+ goto done;
+
+ case IPC_STATE__OTHER_ERROR:
+ default:
+ ret = error(_("fsmonitor_ipc__send_query: unspecified error on '%s'"),
+ fsmonitor_ipc__get_path(the_repository));
+ goto done;
+ }
+
+done:
+ trace2_region_leave("fsm_client", "query", NULL);
+
+ return ret;
+}
+
+int fsmonitor_ipc__send_command(const char *command,
+ struct strbuf *answer)
+{
+ struct ipc_client_connection *connection = NULL;
+ struct ipc_client_connect_options options
+ = IPC_CLIENT_CONNECT_OPTIONS_INIT;
+ int ret;
+ enum ipc_active_state state;
+ const char *c = command ? command : "";
+ size_t c_len = command ? strlen(command) : 0;
+
+ strbuf_reset(answer);
+
+ options.wait_if_busy = 1;
+ options.wait_if_not_found = 0;
+
+ state = ipc_client_try_connect(fsmonitor_ipc__get_path(the_repository),
+ &options, &connection);
+ if (state != IPC_STATE__LISTENING) {
+ die(_("fsmonitor--daemon is not running"));
+ return -1;
+ }
+
+ ret = ipc_client_send_command_to_connection(connection, c, c_len,
+ answer);
+ ipc_client_close_connection(connection);
+
+ if (ret == -1) {
+ die(_("could not send '%s' command to fsmonitor--daemon"), c);
+ return -1;
+ }
+
+ return 0;
+}
+
+#endif