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+// Backwards-compatible protocol version.
+const VERSION = 1;
+
+// From the frontend to the relay.
+struct CommandMessage {
+ // The command sequence number will be repeated in responses
+ // in the respective fields.
+ u32 command_seq;
+ union CommandData switch (enum Command {
+ HELLO,
+ ACTIVE,
+ BUFFER_ACTIVATE,
+ BUFFER_INPUT,
+ BUFFER_TOGGLE_UNIMPORTANT,
+ PING_RESPONSE,
+ PING,
+ BUFFER_COMPLETE,
+ BUFFER_LOG,
+ } command) {
+ // If the version check succeeds, the client will receive
+ // an initial stream of SERVER_UPDATE, BUFFER_UPDATE, BUFFER_STATS,
+ // BUFFER_LINE, and finally a BUFFER_ACTIVATE message.
+ case HELLO:
+ u32 version;
+ case ACTIVE:
+ void;
+ case BUFFER_ACTIVATE:
+ string buffer_name;
+ case BUFFER_INPUT:
+ string buffer_name;
+ string text;
+ // XXX: Perhaps this should rather be handled through a /buffer command.
+ case BUFFER_TOGGLE_UNIMPORTANT:
+ string buffer_name;
+ case PING_RESPONSE:
+ u32 event_seq;
+
+ // Only these commands may produce Event.RESPONSE, as below,
+ // but any command may produce an error.
+ case PING:
+ void;
+ case BUFFER_COMPLETE:
+ string buffer_name;
+ string text;
+ u32 position;
+ case BUFFER_LOG:
+ string buffer_name;
+ } data;
+};
+
+// From the relay to the frontend.
+struct EventMessage {
+ u32 event_seq;
+ union EventData switch (enum Event {
+ PING,
+ BUFFER_LINE,
+ BUFFER_UPDATE,
+ BUFFER_STATS,
+ BUFFER_RENAME,
+ BUFFER_REMOVE,
+ BUFFER_ACTIVATE,
+ BUFFER_CLEAR,
+ SERVER_UPDATE,
+ SERVER_RENAME,
+ SERVER_REMOVE,
+ ERROR,
+ RESPONSE,
+ } event) {
+ case PING:
+ void;
+
+ case BUFFER_LINE:
+ string buffer_name;
+ // Whether the line should also be displayed in the active buffer.
+ bool leak_to_active;
+ bool is_unimportant;
+ bool is_highlight;
+ enum Rendition {
+ BARE,
+ INDENT,
+ STATUS,
+ ERROR,
+ JOIN,
+ PART,
+ ACTION,
+ } rendition;
+ // Unix timestamp in milliseconds.
+ u64 when;
+ // Broken-up text, with in-band formatting.
+ union ItemData switch (enum Item {
+ TEXT,
+ RESET,
+ FG_COLOR,
+ BG_COLOR,
+ FLIP_BOLD,
+ FLIP_ITALIC,
+ FLIP_UNDERLINE,
+ FLIP_INVERSE,
+ FLIP_CROSSED_OUT,
+ FLIP_MONOSPACE,
+ } kind) {
+ case TEXT:
+ string text;
+ case RESET:
+ void;
+ case FG_COLOR:
+ i16 color;
+ case BG_COLOR:
+ i16 color;
+ case FLIP_BOLD:
+ case FLIP_ITALIC:
+ case FLIP_UNDERLINE:
+ case FLIP_INVERSE:
+ case FLIP_CROSSED_OUT:
+ case FLIP_MONOSPACE:
+ void;
+ } items<>;
+ case BUFFER_UPDATE:
+ string buffer_name;
+ bool hide_unimportant;
+ union BufferContext switch (enum BufferKind {
+ GLOBAL,
+ SERVER,
+ CHANNEL,
+ PRIVATE_MESSAGE,
+ } kind) {
+ case GLOBAL:
+ void;
+ case SERVER:
+ string server_name;
+ case CHANNEL:
+ string server_name;
+ ItemData topic<>;
+ // This includes parameters, separated by spaces.
+ string modes;
+ case PRIVATE_MESSAGE:
+ string server_name;
+ } context;
+ case BUFFER_STATS:
+ string buffer_name;
+ // These are cumulative, even for lines flushed out from buffers.
+ // Updates to these values aren't broadcasted, thus handle:
+ // - BUFFER_LINE by bumping/setting them as appropriate,
+ // - BUFFER_ACTIVATE by clearing them for the previous buffer
+ // (this way, they can be used to mark unread messages).
+ u32 new_messages;
+ u32 new_unimportant_messages;
+ bool highlighted;
+ case BUFFER_RENAME:
+ string buffer_name;
+ string new;
+ case BUFFER_REMOVE:
+ string buffer_name;
+ case BUFFER_ACTIVATE:
+ string buffer_name;
+ case BUFFER_CLEAR:
+ string buffer_name;
+
+ case SERVER_UPDATE:
+ string server_name;
+ union ServerData switch (enum ServerState {
+ DISCONNECTED,
+ CONNECTING,
+ CONNECTED,
+ REGISTERED,
+ DISCONNECTING,
+ } state) {
+ case DISCONNECTED:
+ case CONNECTING:
+ case CONNECTED:
+ void;
+ case REGISTERED:
+ string user;
+ string user_modes;
+ // Theoretically, we could also send user information in this state,
+ // but we'd have to duplicate both fields.
+ case DISCONNECTING:
+ void;
+ } data;
+ case SERVER_RENAME:
+ // Buffers aren't sent updates for in this circumstance,
+ // as that wouldn't be sufficiently atomic anyway.
+ string server_name;
+ string new;
+ case SERVER_REMOVE:
+ string server_name;
+
+ // Restriction: command_seq strictly follows the sequence received
+ // by the relay, across both of these replies.
+ case ERROR:
+ u32 command_seq;
+ string error;
+ case RESPONSE:
+ u32 command_seq;
+ union ResponseData switch (Command command) {
+ case PING:
+ void;
+ case BUFFER_COMPLETE:
+ u32 start;
+ string completions<>;
+ case BUFFER_LOG:
+ // UTF-8, but not guaranteed.
+ u8 log<>;
+ } data;
+ } data;
+};