2 # A transport class. With two implementations.
3 # One for socket and one for shared memory.
11 typedef void (*vac_callback_t)(unsigned char * data, int len);
12 typedef void (*vac_error_callback_t)(void *, unsigned char *, int);
13 int vac_connect(char * name, char * chroot_prefix, vac_callback_t cb,
15 int vac_disconnect(void);
16 int vac_read(char **data, int *l, unsigned short timeout);
17 int vac_write(char *data, int len);
18 void vac_free(void * msg);
20 int vac_get_msg_index(unsigned char * name);
21 int vac_msg_table_size(void);
22 int vac_msg_table_max_index(void);
24 void vac_rx_suspend (void);
25 void vac_rx_resume (void);
26 void vac_set_error_handler(vac_error_callback_t);
31 # Barfs on failure, no need to check success.
32 vpp_api = ffi.dlopen('libvppapiclient.so')
35 @ffi.callback("void(unsigned char *, int)")
36 def vac_callback_sync(data, len):
37 vpp_object.msg_handler_sync(ffi.buffer(data, len))
40 @ffi.callback("void(unsigned char *, int)")
41 def vac_callback_async(data, len):
42 vpp_object.msg_handler_async(ffi.buffer(data, len))
45 @ffi.callback("void(void *, unsigned char *, int)")
46 def vac_error_handler(arg, msg, msg_len):
47 vpp_object.logger.warning("VPP API client:: %s", ffi.string(msg, msg_len))
50 class VppTransport(object):
51 def __init__(self, parent, read_timeout, server_address):
52 self.connected = False
53 self.read_timeout = read_timeout
58 # Register error handler
59 vpp_api.vac_set_error_handler(vac_error_handler)
62 # from_buffer supported from 1.8.0
63 (major, minor, patch) = [int(s) for s in
64 cffi.__version__.split('.', 3)]
65 if major >= 1 and minor >= 8:
66 self.write = self._write_new_cffi
68 self.write = self._write_legacy_cffi
70 def connect(self, name, pfx, msg_handler, rx_qlen):
74 return vpp_api.vac_connect(name, pfx, msg_handler, rx_qlen)
77 self.connected = False
78 return vpp_api.vac_disconnect()
81 vpp_api.vac_rx_suspend()
84 vpp_api.vac_rx_resume()
86 def get_callback(self, do_async):
87 return vac_callback_sync if not do_async else vac_callback_async
89 def get_msg_index(self, name):
90 return vpp_api.vac_get_msg_index(name)
92 def msg_table_max_index(self):
93 return vpp_api.vac_msg_table_max_index()
95 def _write_new_cffi(self, buf):
96 """Send a binary-packed message to VPP."""
97 if not self.connected:
98 raise IOError(1, 'Not connected')
99 return vpp_api.vac_write(ffi.from_buffer(buf), len(buf))
101 def _write_legacy_cffi(self, buf):
102 """Send a binary-packed message to VPP."""
103 if not self.connected:
104 raise IOError(1, 'Not connected')
105 return vpp_api.vac_write(bytes(buf), len(buf))
108 if not self.connected:
109 raise IOError(1, 'Not connected')
110 mem = ffi.new("char **")
111 size = ffi.new("int *")
112 rv = vpp_api.vac_read(mem, size, self.read_timeout)
114 raise IOError(rv, 'vac_read failed')
115 msg = bytes(ffi.buffer(mem[0], size[0]))
116 vpp_api.vac_free(mem[0])