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#!/usr/bin/env python
from __future__ import print_function
from cffi import FFI
import time
ffi = FFI()
ffi.cdef("""
typedef uint64_t counter_t;
typedef struct {
counter_t packets;
counter_t bytes;
} vlib_counter_t;
typedef enum {
STAT_DIR_TYPE_ILLEGAL = 0,
STAT_DIR_TYPE_SCALAR_INDEX,
STAT_DIR_TYPE_COUNTER_VECTOR_SIMPLE,
STAT_DIR_TYPE_COUNTER_VECTOR_COMBINED,
STAT_DIR_TYPE_ERROR_INDEX,
} stat_directory_type_t;
typedef struct
{
stat_directory_type_t type;
union {
uint64_t offset;
uint64_t index;
uint64_t value;
};
uint64_t offset_vector;
char name[128]; // TODO change this to pointer to "somewhere"
} stat_segment_directory_entry_t;
typedef struct
{
char *name;
stat_directory_type_t type;
union
{
double scalar_value;
uint64_t error_value;
counter_t **simple_counter_vec;
vlib_counter_t **combined_counter_vec;
};
} stat_segment_data_t;
typedef struct
{
uint64_t epoch;
uint64_t in_progress;
uint64_t directory_offset;
uint64_t error_offset;
uint64_t stats_offset;
} stat_segment_shared_header_t;
typedef struct
{
uint64_t current_epoch;
stat_segment_shared_header_t *shared_header;
stat_segment_directory_entry_t *directory_vector;
ssize_t memory_size;
} stat_client_main_t;
stat_client_main_t * stat_client_get(void);
void stat_client_free(stat_client_main_t * sm);
int stat_segment_connect_r (char *socket_name, stat_client_main_t * sm);
int stat_segment_connect (char *socket_name);
void stat_segment_disconnect_r (stat_client_main_t * sm);
void stat_segment_disconnect (void);
uint32_t *stat_segment_ls_r (uint8_t ** patterns, stat_client_main_t * sm);
uint32_t *stat_segment_ls (uint8_t ** pattern);
stat_segment_data_t *stat_segment_dump_r (uint32_t * stats, stat_client_main_t * sm);
stat_segment_data_t *stat_segment_dump (uint32_t * counter_vec);
void stat_segment_data_free (stat_segment_data_t * res);
double stat_segment_heartbeat_r (stat_client_main_t * sm);
double stat_segment_heartbeat (void);
int stat_segment_vec_len(void *vec);
uint8_t **stat_segment_string_vector(uint8_t **string_vector, char *string);
""")
# Utility functions
def make_string_vector(api, strings):
vec = ffi.NULL
if type(strings) is not list:
strings = [strings]
for s in strings:
vec = api.stat_segment_string_vector(vec, ffi.new("char []",
s.encode()))
return vec
def make_string_list(api, vec):
vec_len = api.stat_segment_vec_len(vec)
return [ffi.string(vec[i]) for i in range(vec_len)]
# 2-dimensonal array of thread, index
def simple_counter_vec_list(api, e):
vec = []
for thread in range(api.stat_segment_vec_len(e)):
len_interfaces = api.stat_segment_vec_len(e[thread])
if_per_thread = [e[thread][interfaces]
for interfaces in range(len_interfaces)]
vec.append(if_per_thread)
return vec
def vlib_counter_dict(c):
return {'packets': c.packets,
'bytes': c.bytes}
def combined_counter_vec_list(api, e):
vec = []
for thread in range(api.stat_segment_vec_len(e)):
len_interfaces = api.stat_segment_vec_len(e[thread])
if_per_thread = [vlib_counter_dict(e[thread][interfaces])
for interfaces in range(len_interfaces)]
vec.append(if_per_thread)
return vec
def stat_entry_to_python(api, e):
# Scalar index
if e.type == 1:
return e.scalar_value
return None
if e.type == 2:
return simple_counter_vec_list(api, e.simple_counter_vec)
if e.type == 3:
return combined_counter_vec_list(api, e.combined_counter_vec)
if e.type == 4:
return e.error_value
return None
class VPPStatsIOError(IOError):
pass
class VPPStatsClientLoadError(RuntimeError):
pass
class VPPStats(object):
VPPStatsIOError = VPPStatsIOError
default_socketname = '/var/run/stats.sock'
sharedlib_name = 'libvppapiclient.so'
def __init__(self, socketname=default_socketname, timeout=10):
try:
self.api = ffi.dlopen(VPPStats.sharedlib_name)
except Exception:
raise VPPStatsClientLoadError("Could not open: %s" %
VPPStats.sharedlib_name)
self.client = self.api.stat_client_get()
poll_end_time = time.time() + timeout
while time.time() < poll_end_time:
rv = self.api.stat_segment_connect_r(socketname.encode(),
self.client)
if rv == 0:
break
if rv != 0:
raise VPPStatsIOError()
def heartbeat(self):
return self.api.stat_segment_heartbeat_r(self.client)
def ls(self, patterns):
return self.api.stat_segment_ls_r(make_string_vector(self.api,
patterns),
self.client)
def dump(self, counters):
stats = {}
rv = self.api.stat_segment_dump_r(counters, self.client)
# Raise exception and retry
if rv == ffi.NULL:
raise VPPStatsIOError()
rv_len = self.api.stat_segment_vec_len(rv)
for i in range(rv_len):
n = ffi.string(rv[i].name).decode()
e = stat_entry_to_python(self.api, rv[i])
if e is not None:
stats[n] = e
return stats
def get_counter(self, name):
retries = 0
while True:
try:
d = self.ls(name)
s = self.dump(d)
if len(s) > 1:
raise AttributeError('Matches multiple counters {}'
.format(name))
k, v = s.popitem()
return v
except VPPStatsIOError as e:
if retries > 10:
return None
retries += 1
def disconnect(self):
self.api.stat_segment_disconnect_r(self.client)
self.api.stat_client_free(self.client)
def set_errors(self):
'''Return all errors counters > 0'''
retries = 0
while True:
try:
error_names = self.ls(['/err/'])
error_counters = self.dump(error_names)
break
except VPPStatsIOError as e:
if retries > 10:
return None
retries += 1
return {k: error_counters[k]
for k in error_counters.keys() if error_counters[k]}
def set_errors_str(self):
'''Return all errors counters > 0 pretty printed'''
s = 'ERRORS:\n'
error_counters = self.set_errors()
for k in sorted(error_counters):
s += '{:<60}{:>10}\n'.format(k, error_counters[k])
return s
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