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_zephyr.py
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_zephyr.py
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import os
import pwd
import time
import select
import weakref
import cffi
ffi = cffi.FFI()
ffi.cdef("""
/* netinet/in.h */
struct in_addr { ...; };
struct sockaddr_in { ...; };
/* arpa/inet.h */
char * inet_ntoa(struct in_addr);
int inet_aton(char *, struct in_addr *);
/* zephyr/zephyr.h */
typedef enum {
UNSAFE = 0, UNACKED = 1, ACKED = 2, HMACK = 3, HMCTL = 4, SERVACK = 5,
SERVNAK = 6, CLIENTACK = 7, STAT = 8
} ZNotice_Kind_t;
#define ZAUTH_FAILED ...
#define ZAUTH_YES ...
#define ZAUTH_NO ...
#define Z_MAXOTHERFIELDS ...
struct _ZTimeval {
int tv_sec;
int tv_usec;
};
typedef struct _ZUnique_Id_t {
struct in_addr zuid_addr;
struct _ZTimeval tv;
} ZUnique_Id_t;
typedef struct _ZNotice_t {
ZNotice_Kind_t z_kind;
ZUnique_Id_t z_uid;
struct _ZTimeval z_time;
unsigned short z_port;
int z_auth;
int z_checked_auth;
char *z_class;
char *z_class_inst;
char *z_opcode;
char *z_sender;
char *z_recipient;
char *z_default_format;
int z_num_other_fields;
char *z_other_fields[...];
char *z_message;
int z_message_len;
...;
} ZNotice_t;
typedef struct _ZSubscriptions_t {
char *zsub_recipient;
char *zsub_class;
char *zsub_classinst;
} ZSubscription_t;
typedef int Code_t;
typedef Code_t (*Z_AuthProc)(ZNotice_t*, char *, int, int *);
Code_t ZInitialize(void);
Code_t ZSetFD(int);
Code_t ZOpenPort(unsigned short *port);
int ZGetFD (void);
Code_t ZSubscribeTo(ZSubscription_t *sublist, int nitems,
unsigned int port);
Code_t ZUnsubscribeTo(ZSubscription_t *sublist, int nitems,
unsigned int port);
Code_t ZCancelSubscriptions(unsigned int port);
Code_t ZRetrieveSubscriptions(unsigned short, int*);
Code_t ZGetSubscriptions(ZSubscription_t *, int *);
int ZPending(void);
char *ZGetSender(void);
const char *ZGetRealm(void);
Code_t ZSendNotice(ZNotice_t *, Z_AuthProc);
Code_t ZFreeNotice(ZNotice_t *notice);
Code_t ZReceiveNotice(ZNotice_t *notice, struct sockaddr_in *from);
Code_t ZCheckAuthentication(ZNotice_t*, struct sockaddr_in*);
static const Z_AuthProc ZAUTH;
static const Z_AuthProc ZCAUTH;
static const Z_AuthProc ZNOAUTH;
/* com_err.h */
const char *error_message(int);
""")
C = ffi.verify("""
#include <zephyr/zephyr.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <com_err.h>
""", libraries = ['zephyr', 'com_err'])
def check_errno(errno):
if errno != 0:
raise IOError(errno, ffi.string(C.error_message(errno)))
class ZUid(object):
"""
A per-transaction unique ID for zephyrs
"""
def __init__(self):
self.address = ''
self.time = 0
def to_c(self):
c_uid = ffi.new("ZUnique_Id_t*")
C.inet_aton(self.address, ffi.addressof(c_uid.zuid_addr))
c_uid.tv.tv_sec = int(self.time)
c_uid.tv.tv_usec = int((self.time - int(self.time)) * 100000)
return c_uid
@classmethod
def from_c(cls, c_uid):
uid = cls()
uid.address = ffi.string(C.inet_ntoa(c_uid.zuid_addr))
uid.time = c_uid.tv.tv_sec + (c_uid.tv.tv_usec / 100000.0)
return uid
class ZephyrObjectMetadata(object):
def __init__(self, c_object):
self.c_object = c_object
self.c_strings = {}
class ZephyrObjectDecorator(object):
def __init__(self, cls):
self.decorated = cls
self.c_type = ffi.typeof(cls.__ctype__)
self.c_ptr_type = ffi.getctype(self.c_type, "*")
self.mapping = weakref.WeakKeyDictionary()
def metadata(self, instance):
return self.mapping[instance]
def init(self, inst, c_object):
self.mapping[inst] = ZephyrObjectMetadata(c_object or ffi.new(self.c_ptr_type))
def get(self, inst, attr):
return getattr(self.metadata(inst).c_object, attr)
def set(self, inst, attr, value):
meta = self.metadata(inst)
if isinstance(value, str):
value = ffi.new("char[]", value)
meta.c_strings[attr] = value
elif value is None:
value = ffi.NULL
setattr(meta.c_object, attr, value)
class ZephyrObjectType(type):
def __init__(cls, name, bases, d):
super(ZephyrObjectType, cls).__init__(name, bases, d)
cls.__decorator__ = ZephyrObjectDecorator(cls)
class ZephyrObject(object):
__metaclass__ = ZephyrObjectType
__ctype__ = "void"
def __init__(self, c_object=None):
self.__decorator__.init(self, c_object)
def __getattr__(self, attr):
return self.__decorator__.get(self, attr)
def __setattr__(self, attr, value):
return self.__decorator__.set(self, attr, value)
def unwrap(obj):
return type(obj).__decorator__.metadata(obj).c_object
class CZUid(ZephyrObject):
__ctype__ = 'ZUnique_Id_t'
class CZNotice(ZephyrObject):
__ctype__ = 'ZNotice_t'
class CZSubscription(ZephyrObject):
__ctype__ = 'ZSubscription_t'
class ZNotice(object):
"""
A zephyr message
"""
def __init__(self, **options):
self.kind = C.ACKED
self.cls = 'message'
self.instance = 'personal'
self.uid = ZUid()
self.time = 0
self.port = 0
self.auth = True
self.recipient = None
self.sender = None
self.opcode = None
self.format = "Class $class, Instance $instance:\nTo: @bold($recipient) at $time $date\nFrom: @bold{$1 <$sender>}\n\n$2"
self.other_fields = []
self.fields = []
for k, v in options.iteritems():
setattr(self, k, v)
def getmessage(self):
return '\0'.join(self.fields)
def setmessage(self, newmsg):
self.fields = newmsg.split('\0')
message = property(getmessage, setmessage)
def send(self):
c_notice = self.to_c()
original_message = self.message
if self.auth:
errno = C.ZSendNotice(unwrap(c_notice), C.ZAUTH)
else:
errno = C.ZSendNotice(unwrap(c_notice), C.ZNOAUTH)
check_errno(errno)
self.load_from_c(c_notice)
self.message = original_message
C.ZFreeNotice(unwrap(c_notice))
def load_from_c(self, c_notice):
self.kind = c_notice.z_kind
self.uid = ZUid.from_c(c_notice.z_uid)
self.time = c_notice.z_time.tv_sec + (c_notice.z_time.tv_usec / 100000.0)
self.port = int(c_notice.z_port)
self.auth = bool(c_notice.z_auth)
self.cls = ffi.string(c_notice.z_class)
self.instance = ffi.string(c_notice.z_class_inst)
self.recipient = ffi.string(c_notice.z_recipient)
self.sender = ffi.string(c_notice.z_sender)
self.opcode = ffi.string(c_notice.z_opcode)
self.format = ffi.string(c_notice.z_default_format)
self.other_fields = list()
for i in range(c_notice.z_num_other_fields):
self.other_fields.append(ffi.string(c_notice.z_other_fields[i]))
if c_notice.z_message == ffi.NULL:
self.message = None
else:
self.message = ffi.buffer(c_notice.z_message, c_notice.z_message_len)[:]
@classmethod
def from_c(cls, c_notice):
notice = cls()
notice.load_from_c(c_notice)
return notice
def to_c(self):
c_notice = CZNotice()
c_notice.z_kind = self.kind
c_notice.z_uid = self.uid.to_c()[0]
if self.time != 0:
c_notice.z_time.tv_sec = int(self.time)
c_notice.z_time.tv_usec = int((self.time - c_notice.z_time.tv_sec) * 100000)
if self.port != 0:
c_notice.z_port = self.port
c_notice.z_auth = int(self.auth)
c_notice.z_class = self.cls
c_notice.z_class_inst = self.instance
c_notice.z_recipient = self.recipient
c_notice.z_sender = self.sender
c_notice.z_opcode = self.opcode
c_notice.z_default_format = self.format
c_notice.z_num_other_fields = len(self.other_fields)
for i, field in enumerate(self.other_fields):
c_notice.z_other_fields[i] = field
if isinstance(self.message, unicode):
self.encoded_message = self.message.encode('utf-8')
else:
self.encoded_message = self.message
c_notice.z_message = self.encoded_message
c_notice.z_message_len = len(self.encoded_message)
return c_notice
def initialize():
check_errno(C.ZInitialize())
def openPort():
port = ffi.new('unsigned short *')
port[0] = 0
check_errno(C.ZOpenPort(port))
return int(port[0])
def getFD():
return C.ZGetFD()
def setFD(fd):
check_errno(C.ZSetFD(fd))
def sub(cls, instance, recipient):
newsub = CZSubscription()
newsub.zsub_class = cls
newsub.zsub_classinst = instance
newsub.zsub_recipient = recipient
check_errno(C.ZSubscribeTo(unwrap(newsub), 1, 0))
def subAll(lst):
memory = ffi.new('ZSubscription_t[]', len(lst))
csubs = memory.map(CZSubscription)
for i, sub in enumerate(lst):
csubs[i].zsub_class = sub[0]
csubs[i].zsub_classinst = sub[1]
csubs[i].zsub_recipient = sub[2]
check_errno(C.ZSubscribeTo(memory, len(lst), 0))
def unsub(cls, instance, recipient):
delsub = CZSubscription()
delsub.zsub_class = cls
delsub.zsub_classinst = instance
delsub.zsub_recipient = recipient
check_errno(C.ZUnsubscribeTo(delsub, 1, 0))
def cancelSubs():
check_errno(C.ZCancelSubscriptions(0))
def receive(block=False):
while C.ZPending() == 0:
if not block:
return None
select.select([getFD()], [], [])
c_notice = CZNotice()
sender = ffi.new('struct sockaddr_in *')
check_errno(C.ZReceiveNotice(unwrap(c_notice), sender))
if C.ZCheckAuthentication(unwrap(c_notice), sender) == C.ZAUTH_YES:
c_notice.z_auth = 1
else:
c_notice.z_auth = 0
return ZNotice.from_c(c_notice)
def sender():
return ffi.string(C.ZGetSender())
def realm():
return ffi.string(C.ZGetRealm())
def getSubscriptions():
c_num = ffi.new('int *')
check_errno(C.ZRetrieveSubscriptions(0, c_num))
csubs = ffi.new("ZSubscription_t[]", int(c_num[0]))
check_errno(C.ZGetSubscriptions(csubs, c_num))
subs = [(ffi.string(csubs[i].zsub_class),
ffi.string(csubs[i].zsub_classinst),
ffi.string(csubs[i].zsub_recipient))
for i in xrange(int(c_num[0]))]
return subs