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steinbac
hidra
Commits
d1fa11d1
Commit
d1fa11d1
authored
8 years ago
by
Manuela Kuhn
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First approach of nexusTransferAPI in C
parent
27edea36
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APIs/nexusTransferAPI.c
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d1fa11d1
// API to ingest data into a data transfer unit
//#ifndef DATAINGEST_H
#define DATAINGEST_H
#define version "0.0.1"
#include
<zmq.h>
#include
<stdio.h>
#include
<unistd.h>
#include
<string.h>
#include
<stdlib.h>
#include
<assert.h>
#include
<errno.h>
typedef
int
bool
;
#define true 1
#define false 0
// helper functions for sending and receiving messages
// source: Pieter Hintjens: ZeroMQ; O'Reilly
static
char
*
s_recv
(
void
*
socket
)
{
zmq_msg_t
message
;
zmq_msg_init
(
&
message
);
int
size
=
zmq_msg_recv
(
&
message
,
socket
,
0
);
if
(
size
==
-
1
)
return
NULL
;
char
*
string
=
malloc
(
size
+
1
);
memcpy
(
string
,
zmq_msg_data
(
&
message
),
size
);
printf
(
"recieved string: %s
\n
"
,
string
);
zmq_msg_close
(
&
message
);
string
[
size
]
=
0
;
return
string
;
};
static
int
s_send
(
void
*
socket
,
char
*
string
)
{
printf
(
"Sending: %s
\n
"
,
string
);
int
size
=
zmq_send
(
socket
,
string
,
strlen
(
string
),
0
);
if
(
size
==
-
1
)
{
printf
(
"Sending failed
\n
"
);
// fprintf (stderr, "ERROR: Sending failed\n");
// perror("");
};
return
size
;
};
typedef
struct
{
char
*
extHost
;
char
*
localhost
;
char
*
signalPort
;
char
*
dataPort
;
// Prepare our context and socket
void
*
context
;
void
*
signalSocket
;
void
*
dataSocket
;
// Initialize poll set
// zmq::pollitem_t items [];
int
numberOfStreams
;
// self.recvdCloseFrom = []
char
*
replyToSignal
;
bool
allCloseRecvd
;
}
nexusTransfer
;
int
nexusTransfer_init
(
nexusTransfer
*
nT
)
{
nT
->
extHost
=
"0.0.0.0"
;
nT
->
localhost
=
"localhost"
;
nT
->
signalPort
=
"50050"
;
nT
->
dataPort
=
"50100"
;
if
(
(
nT
->
context
=
zmq_ctx_new
())
==
NULL
)
{
perror
(
"ERROR: Cannot create 0MQ context: "
);
exit
(
9
);
}
if
(
(
nT
->
signalSocket
=
zmq_socket
(
nT
->
context
,
ZMQ_REP
))
==
NULL
)
{
perror
(
"ERROR: Could not create 0MQ signalSocket: "
);
exit
(
9
);
}
if
(
(
nT
->
dataSocket
=
zmq_socket
(
nT
->
context
,
ZMQ_PULL
))
==
NULL
)
{
perror
(
"ERROR: Could not create 0MQ dataSocket: "
);
exit
(
9
);
}
nT
->
replyToSignal
=
""
nT
->
allCloseRecvd
=
false
char
connectionStr
[
128
];
int
rc
;
// Create sockets
snprintf
(
connectionStr
,
sizeof
(
connectionStr
),
"tcp://%s:%s"
,
nT
->
extlHost
,
nT
->
signalPort
);
// rc = zmq_connect(nT->signalSocket, connectionStr);
// assert (rc == 0);
if
(
zmq_bind
(
nT
->
signalSocket
,
connectionStr
)
)
{
fprintf
(
stderr
,
"ERROR: Could not start signalSocket (bind) for '%s'
\n
"
,
connectionStr
);
perror
(
""
);
}
else
{
printf
(
"signalSocket started (bind) for '%s'
\n
"
,
connectionStr
);
}
snprintf
(
connectionStr
,
sizeof
(
connectionStr
),
"tcp://%s:%s"
,
nT
->
localhost
,
nT
->
dataPort
);
// rc = zmq_connect(nT->dataSocket, connectionStr);
// assert (rc == 0);
if
(
zmq_bind
(
nT
->
dataSocket
,
connectionStr
)
)
{
fprintf
(
stderr
,
"ERROR: Could not start dataSocket (bind) for '%s'
\n
"
,
connectionStr
);
perror
(
""
);
}
else
{
printf
(
"dataSocket started (bind) for '%s'
\n
"
,
connectionStr
);
}
return
0
;
}
int
nexusTransfer_read
(
nexusTransfer
*
nT
,
char
*
data
,
int
size
)
{
zmq_pollitem_t
items
[]
=
{
{
nT
->
signalSocket
,
0
,
ZMQ_POLLIN
,
0
},
{
nT
->
dataSocket
,
0
,
ZMQ_POLLIN
,
0
}
};
while
(
1
)
{
printf
(
"polling"
);
zmq_poll
(
items
,
2
,
-
1
);
if
(
items
[
0
].
revents
&
ZMQ_POLLIN
)
{
printf
(
"signalSocket is polling
\n
"
);
data
=
s_recv
(
dI
->
signalSocket
);
printf
(
"signalSocket recv: '%s'
\n
"
,
message
);
if
(
data
==
b
"CLOSE_FILE"
&&
nT
->
allCloseRecvd
==
false
)
:
nT
->
replyToSignal
=
data
;
else:
rc
=
zmq_send
(
nT
-
signalSocket
,
data
,
strlen
(
data
),
0
);
printf
(
"signalSocket send: '%s'
\n
"
,
data
);
return
0
;
}
if
(
items
[
1
].
revents
&
ZMQ_POLLIN
)
{
printf
(
"dataSocket is polling
\n
"
);
char
*
multipartMessage
[
2
];
int
j
;
rc
=
getMultipartMessage
(
dI
->
dataSocket
,
multipartMessage
)
for
(
j
=
0
;
j
<
2
;
j
++
)
{
free
(
multipartMessage
[
j
]);
};
}
};
int
recv_multipartMessage
(
void
*
socket
,
char
**
multipartMessage
,
int
*
len
)
{
int
i
=
0
;
int
size
;
int
more
;
size_t
more_size
=
sizeof
(
more
);
while
(
1
)
{
// Wait for next request from client
zmq_msg_t
message
;
zmq_msg_init
(
&
message
);
m_size
=
zmq_msg_recv
(
&
message
,
socket
,
0
);
//Process message
multipartMessage
[
i
]
=
malloc
(
m_size
+
1
);
memcpy
(
multipartMessage
[
i
],
zmq_msg_data
(
&
message
),
m_size
);
printf
(
"recieved string: %s
\n
"
,
multipartMessage
[
i
]);
multipartMessage
[
i
]
[
m_size
]
=
0
;
i
++
;
zmq_msg_close
(
&
message
);
zmq_getsockopt
(
socket
,
ZMQ_RCVMORE
,
&
more
,
&
more_size
);
if
(
more
==
0
)
{
printf
(
"last received
\n
"
);
*
len
=
i
;
break
;
};
}
return
0
;
};
int
getMultipartMessage
(
void
*
socket
,
char
*
data
)
{
char
*
mulitpartMessage
[
2
];
int
len
;
int
rc
;
//TODO multipart
rc
=
recv_multipartMessage
(
dI
-
dataSocket
,
multipartMessage
,
len
);
printf
(
"multipartMessage[0]=%s
\n
multipartMessage[1]=%s
\n
"
,
multipartMessage
[
0
],
multipartMessage
[
1
]);
//self.log.error("Could not receive data due to unknown error.", exc_info=True)
if
(
len
<
2
)
{
printf
(
"Received mutipart-message is too short. Either config or file content is missing."
);
// self.log.debug("multipartMessage=" + str(mutipartMessage))
//TODO coorect errorcode
return
-
1
;
}
if
(
multipartMessage
[
0
]
==
"CLOSE_FILE"
)
{
/*
id = multipartMessage[1]
self.recvdCloseFrom.append(id)
self.log.debug("Received close-file-signal from DataDispatcher-" + id)
# get number of signals to wait for
if not self.numberOfStreams:
self.numberOfStreams = int(id.split("/")[1])
# have all signals arrived?
if len(self.recvdCloseFrom) == self.numberOfStreams:
self.log.info("All close-file-signals arrived")
self.allCloseRecvd = True
if self.replyToSignal:
self.signalSocket.send(self.replyToSignal)
self.log.debug("signalSocket send: " + self.replyToSignal)
self.replyToSignal = False
else:
pass
*/
data
=
"CLOSE_FILE"
return
0
;
}
else
{
data
=
multipartMessage
[
1
];
return
0
;
}
};
int
nexusTransfer_stop
(
dataIngest
*
nT
)
{
printf
(
"closing signalSocket...
\n
"
);
zmq_close
(
nT
->
signalSocket
);
printf
(
"closing dataSocket...
\n
"
);
zmq_close
(
nT
->
dataSocket
);
// self.log.error("closing ZMQ Sockets...failed.", exc_info=True)
printf
(
"Closing ZMQ context...
\n
"
);
zmq_ctx_destroy
(
nT
->
context
);
// self.log.error("Closing ZMQ context...failed.", exc_info=True)
// free (nT);
printf
(
"Cleanup finished.
\n
"
);
return
0
;
};
//#endif
int
main
()
{
nexusTransfer
*
obj
;
obj
=
malloc
(
sizeof
(
nexusTransfer
));
char
*
data
;
int
i
;
int
size
;
int
rc
;
rc
=
nexusTransfer_init
(
obj
);
rc
=
nexusTransfer_read
(
obj
,
data
,
size
);
printf
(
"Read data: %s, size: %d
\n
"
,
data
,
size
);
for
(
i
=
0
;
i
<
5
;
i
++
)
{
rc
=
nexusTransfer_read
(
obj
,
data
,
size
);
printf
(
"Read data: %s, size: %d
\n
"
,
data
,
size
);
};
rc
=
nexusTransfer_read
(
obj
,
data
,
size
);
printf
(
"Read data: %s, size: %d
\n
"
,
data
,
size
);
printf
(
"Stopping
\n
"
);
rc
=
nexusTransfer_stop
(
obj
);
free
(
obj
);
return
0
;
};
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