discover: Handle and track plugin_options

Track plugin_options in the device_handler. Plugins can be added with
device_handler_add_plugin_option() and accessed via
device_handler_get_plugin().
Extend discover_server to support the new 'add' and 'remove' pb-protocol
actions and advertise new plugins to connecting clients.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>

discover/device-handler.c

@@ -84,6 +84,9 @@ struct device_handler {
 
 	struct list		progress;
 	unsigned int		n_progress;
+
+	struct plugin_option	**plugins;
+	unsigned int		n_plugins;
 };
 
 static int mount_device(struct discover_device *dev);
@@ -126,6 +129,28 @@ const struct discover_device *device_handler_get_device(
 	return handler->devices[index];
 }
 
+/**
+ * device_handler_get_plugin_count - Get the count of current handler plugins.
+ */
+int device_handler_get_plugin_count(const struct device_handler *handler)
+{
+	return handler->n_plugins;
+}
+
+/**
+ * discover_handler_get_plugin - Get a handler plugin by index.
+ */
+const struct plugin_option *device_handler_get_plugin(
+	const struct device_handler *handler, unsigned int index)
+{
+	if (index >= handler->n_plugins) {
+		assert(0 && "bad index");
+		return NULL;
+	}
+
+	return handler->plugins[index];
+}
+
 struct network *device_handler_get_network(
 		const struct device_handler *handler)
 {
@@ -385,6 +410,15 @@ void device_handler_reinit(struct device_handler *handler)
 	handler->ramdisks = NULL;
 	handler->n_ramdisks = 0;
 
+	/* drop any known plugins */
+	for (i = 0; i < handler->n_plugins; i++)
+		talloc_free(handler->plugins[i]);
+	talloc_free(handler->plugins);
+	handler->plugins = NULL;
+	handler->n_plugins = 0;
+
+	discover_server_notify_plugins_remove(handler->server);
+
 	device_handler_reinit_sources(handler);
 }
 
@@ -1408,6 +1442,36 @@ void device_handler_discover_context_commit(struct device_handler *handler,
 	}
 }
 
+void device_handler_add_plugin_option(struct device_handler *handler,
+		struct plugin_option *opt)
+{
+	struct plugin_option *tmp;
+	unsigned int i;
+
+	for (i = 0; i < handler->n_plugins; i++) {
+		tmp = handler->plugins[i];
+		/* If both id and version match, ignore */
+		if (strncmp(opt->id, tmp->id, strlen(opt->id)) == 0 &&
+				strncmp(opt->version, tmp->version,
+					strlen(opt->version) == 0)) {
+			pb_log("discover: Plugin '%s' already exists, ignoring\n",
+					opt->id);
+			return;
+		}
+	}
+
+	handler->plugins = talloc_realloc(handler, handler->plugins,
+			struct plugin_option *, handler->n_plugins + 1);
+	if (!handler->plugins) {
+		pb_log("Failed to allocate memory for new plugin\n");
+		handler->n_plugins = 0;
+		return;
+	}
+
+	handler->plugins[handler->n_plugins++] = opt;
+	discover_server_notify_plugin_option_add(handler->server, opt);
+}
+
 static void device_handler_update_lang(const char *lang)
 {
 	const char *cur_lang;

discover/device-handler.h

@@ -80,6 +80,9 @@ void device_handler_destroy(struct device_handler *devices);
 int device_handler_get_device_count(const struct device_handler *handler);
 const struct discover_device *device_handler_get_device(
 	const struct device_handler *handler, unsigned int index);
+int device_handler_get_plugin_count(const struct device_handler *handler);
+const struct plugin_option *device_handler_get_plugin(
+	const struct device_handler *handler, unsigned int index);
 struct network *device_handler_get_network(
 		const struct device_handler *handler);
 
@@ -126,6 +129,8 @@ struct discover_boot_option *discover_boot_option_create(
 		struct discover_device *dev);
 void discover_context_add_boot_option(struct discover_context *ctx,
 		struct discover_boot_option *opt);
+void device_handler_add_plugin_option(struct device_handler *handler,
+		struct plugin_option *opt);
 
 int device_handler_user_event(struct device_handler *handler,
 				struct event *event);

discover/discover-server.c

@@ -139,6 +139,39 @@ static int write_boot_option_add_message(struct discover_server *server,
 	return client_write_message(server, client, message);
 }
 
+static int write_plugin_option_add_message(struct discover_server *server,
+		struct client *client, const struct plugin_option *opt)
+{
+	struct pb_protocol_message *message;
+	int len;
+
+	len = pb_protocol_plugin_option_len(opt);
+
+	message = pb_protocol_create_message(client,
+			PB_PROTOCOL_ACTION_PLUGIN_OPTION_ADD, len);
+	if (!message)
+		return -1;
+
+	pb_protocol_serialise_plugin_option(opt, message->payload, len);
+
+	return client_write_message(server, client, message);
+}
+
+static int write_plugins_remove_message(struct discover_server *server,
+		struct client *client)
+{
+	struct pb_protocol_message *message;
+
+	message = pb_protocol_create_message(client,
+			PB_PROTOCOL_ACTION_PLUGINS_REMOVE, 0);
+	if (!message)
+		return -1;
+
+	/* No payload so nothing to serialise */
+
+	return client_write_message(server, client, message);
+}
+
 static int write_device_remove_message(struct discover_server *server,
 		struct client *client, char *dev_id)
 {
@@ -284,7 +317,7 @@ static int discover_server_process_connection(void *arg)
 {
 	struct discover_server *server = arg;
 	struct statuslog_entry *entry;
-	int fd, rc, i, n_devices;
+	int fd, rc, i, n_devices, n_plugins;
 	struct client *client;
 
 	/* accept the incoming connection */
@@ -339,6 +372,15 @@ static int discover_server_process_connection(void *arg)
 	list_for_each_entry(&server->status, entry, list)
 		write_boot_status_message(server, client, entry->status);
 
+	/* send installed plugins to client */
+	n_plugins = device_handler_get_plugin_count(server->device_handler);
+	for (i = 0; i < n_plugins; i++) {
+		const struct plugin_option *plugin;
+
+		plugin = device_handler_get_plugin(server->device_handler, i);
+		write_plugin_option_add_message(server, client, plugin);
+	}
+
 	return 0;
 }
 
@@ -416,6 +458,23 @@ void discover_server_notify_config(struct discover_server *server,
 		write_config_message(server, client, config);
 }
 
+void discover_server_notify_plugin_option_add(struct discover_server *server,
+		struct plugin_option *opt)
+{
+	struct client *client;
+
+	list_for_each_entry(&server->clients, client, list)
+		write_plugin_option_add_message(server, client, opt);
+}
+
+void discover_server_notify_plugins_remove(struct discover_server *server)
+{
+	struct client *client;
+
+	list_for_each_entry(&server->clients, client, list)
+		write_plugins_remove_message(server, client);
+}
+
 void discover_server_set_device_source(struct discover_server *server,
 		struct device_handler *handler)
 {

discover/discover-server.h

@@ -7,6 +7,8 @@ struct discover_server;
 struct device_handler;
 struct boot_option;
 struct status;
+struct plugin_option;
+struct boot_status;
 struct system_info;
 struct device;
 struct config;
@@ -30,4 +32,7 @@ void discover_server_notify_system_info(struct discover_server *server,
 		const struct system_info *sysinfo);
 void discover_server_notify_config(struct discover_server *server,
 		const struct config *config);
+void discover_server_notify_plugin_option_add(struct discover_server *server,
+		struct plugin_option *option);
+void discover_server_notify_plugins_remove(struct discover_server *server);
 #endif /* _DISCOVER_SERVER_H */

test/parser/Makefile.am

@@ -100,6 +100,7 @@ test_parser_libtest_ro_SOURCES = \
 	test/parser/utils.c \
 	test/parser/handler.c \
 	test/parser/network.c \
+	test/parser/user-event.c \
 	test/parser/parser-test.h \
 	discover/yaboot-parser.c \
 	discover/kboot-parser.c \

test/parser/handler.c

@@ -7,6 +7,7 @@
 #include "device-handler.h"
 
 struct network;
+struct client;
 
 typedef void (*boot_status_fn)(void *arg, struct status *);
 
@@ -110,3 +111,8 @@ void pending_network_jobs_start(void)
 void pending_network_jobs_cancel(void)
 {
 }
+
+void discover_server_notify_plugins_remove(struct discover_server *server)
+{
+	(void)server;
+}

test/parser/user-event.c

@@ -0,0 +1,13 @@
+
+#include <assert.h>
+
+#include <types/types.h>
+
+struct device_handler;
+
+void device_handler_add_plugin_option(struct device_handler *handler,
+		struct plugin_option *opt)
+{
+	(void)handler;
+	(void)opt;
+}