handlers.c File Reference

ACIP protocol packet handlers implementation. More...

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Data Structures
struct	handler_hash_entry_t
	Hash table entry for packet type to handler mapping. More...

Macros
#define	HANDLER_HASH_SIZE   32
#define	CLIENT_HANDLER_COUNT   20
#define	SERVER_HANDLER_COUNT   20
#define	HANDLER_HASH(type)   ((type) % HANDLER_HASH_SIZE)

Typedefs
typedef asciichat_error_t(*	acip_client_handler_func_t) (const void *payload, size_t payload_len, const acip_client_callbacks_t *callbacks)
typedef asciichat_error_t(*	acip_server_handler_func_t) (const void *payload, size_t payload_len, void *client_ctx, const acip_server_callbacks_t *callbacks)

Functions
asciichat_error_t	acip_handle_client_packet (acip_transport_t *transport, packet_type_t type, const void *payload, size_t payload_len, const acip_client_callbacks_t *callbacks)
	Handle incoming packet on client side.
asciichat_error_t	acip_handle_server_packet (acip_transport_t *transport, packet_type_t type, const void *payload, size_t payload_len, void *client_ctx, const acip_server_callbacks_t *callbacks)
	Handle incoming packet on server side.

Detailed Description

ACIP protocol packet handlers implementation.

Implements packet dispatching for both client and server sides. Uses O(1) array-based dispatch instead of O(n) switch statements. Parses packet payloads and dispatches to registered callbacks.

Author

Zachary Fogg me@zf.nosp@m.o.gg

Date

January 2026

Definition in file network/acip/handlers.c.

Macro Definition Documentation

CLIENT_HANDLER_COUNT

#define CLIENT_HANDLER_COUNT   20

Definition at line 43 of file network/acip/handlers.c.

HANDLER_HASH

#define HANDLER_HASH

(

type

)

((type) % HANDLER_HASH_SIZE)

Definition at line 55 of file network/acip/handlers.c.

HANDLER_HASH_SIZE

#define HANDLER_HASH_SIZE   32

Definition at line 42 of file network/acip/handlers.c.

SERVER_HANDLER_COUNT

#define SERVER_HANDLER_COUNT   20

Definition at line 44 of file network/acip/handlers.c.

Typedef Documentation

acip_client_handler_func_t

typedef asciichat_error_t(* acip_client_handler_func_t) (const void *payload, size_t payload_len, const acip_client_callbacks_t *callbacks)

Definition at line 30 of file network/acip/handlers.c.

acip_server_handler_func_t

typedef asciichat_error_t(* acip_server_handler_func_t) (const void *payload, size_t payload_len, void *client_ctx, const acip_server_callbacks_t *callbacks)

Definition at line 33 of file network/acip/handlers.c.

Function Documentation

acip_handle_client_packet()

asciichat_error_t acip_handle_client_packet	(	acip_transport_t *	transport,
		packet_type_t	type,
		const void *	payload,
		size_t	payload_len,
		const acip_client_callbacks_t *	callbacks
	)

Handle incoming packet on client side.

Dispatches packet to appropriate callback based on type. Transport-agnostic - works with TCP, WebSocket, etc.

Parameters

transport	Transport instance
type	Packet type
payload	Packet payload
payload_len	Payload length
callbacks	Application callbacks

Returns

ASCIICHAT_OK on success, error code on failure

Definition at line 201 of file network/acip/handlers.c.

                                                                                                          {
  if (!transport || !callbacks) {
    return SET_ERRNO(ERROR_INVALID_PARAM, "Invalid transport or callbacks");
  }
  (void)transport;
 
  // ACDS broadcasts participant lifecycle notifications to peers. The generic
  // client callback set does not expose them, so ignore them while keeping the
  // signaling receive loop alive for subsequent SDP and ICE packets.
  if (type == PACKET_TYPE_ACIP_PARTICIPANT_JOINED || type == PACKET_TYPE_ACIP_PARTICIPANT_LEFT) {
    return ASCIICHAT_OK;
  }
 
  // O(1) dispatch via hash table lookup
  int idx = handler_hash_lookup(g_client_handler_hash, type);
  if (idx < 0) {
    return SET_ERRNO(ERROR_INVALID_PARAM, "Unhandled client packet type: %d", type);
  }
 
  return g_client_handlers[idx](payload, payload_len, callbacks);
}

References ASCIICHAT_OK, ERROR_INVALID_PARAM, PACKET_TYPE_ACIP_PARTICIPANT_JOINED, PACKET_TYPE_ACIP_PARTICIPANT_LEFT, and SET_ERRNO.

Referenced by acip_client_receive_and_dispatch().

acip_handle_server_packet()

asciichat_error_t acip_handle_server_packet	(	acip_transport_t *	transport,
		packet_type_t	type,
		const void *	payload,
		size_t	payload_len,
		void *	client_ctx,
		const acip_server_callbacks_t *	callbacks
	)

Handle incoming packet on server side.

Dispatches packet to appropriate callback based on type. Transport-agnostic - works with TCP, WebSocket, etc.

Parameters

transport	Transport instance
type	Packet type
payload	Packet payload
payload_len	Payload length
client_ctx	Per-client context (e.g., client_info_t*)
callbacks	Application callbacks

Returns

ASCIICHAT_OK on success, error code on failure

Definition at line 710 of file network/acip/handlers.c.

                                                                                      {
  if (!transport || !callbacks) {
    return SET_ERRNO(ERROR_INVALID_PARAM, "Invalid transport or callbacks");
  }
  (void)transport;
 
  // DEBUG: Log all packet types received
  log_dev("ACIP_HANDLE: type=%d payload_len=%zu", type, payload_len);
 
  // O(1) dispatch via hash table lookup
  int idx = handler_hash_lookup(g_server_handler_hash, type);
  if (idx < 0) {
    log_error("ACIP_HANDLER_NOT_FOUND: No handler for packet type=%d (0x%04x, name=%s)", type, type,
              g_packet_type_name(type));
    return SET_ERRNO(ERROR_INVALID_PARAM, "Unhandled server packet type: %d", type);
  }
 
  log_dev("HANDLER_DISPATCH: type=%d (%s), handler_idx=%d, payload=%zu bytes",
           type, g_packet_type_name(type), idx, payload_len);
  asciichat_error_t result = g_server_handlers[idx](payload, payload_len, client_ctx, callbacks);
 
  if (result != ASCIICHAT_OK) {
    log_error("❌ [HANDLER_ERROR] Handler failed: type=%d (%s), result=%d", type, g_packet_type_name(type), result);
  } else {
    log_dev("HANDLER_COMPLETE: type=%d (%s), payload=%zu bytes", type,
             g_packet_type_name(type), payload_len);
  }
 
  return result;
}

References ASCIICHAT_OK, ERROR_INVALID_PARAM, log_dev, log_error, and SET_ERRNO.

Referenced by acip_server_receive_and_dispatch(), and client_dispatch_thread().