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cpp-libs
Actor Framework
Commits
e646ce1e
Commit
e646ce1e
authored
Nov 05, 2012
by
Dominik Charousset
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code cleanup and documentation
parent
fe55e3cb
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-166
examples/remote_actors/distributed_math_actor.cpp
examples/remote_actors/distributed_math_actor.cpp
+229
-166
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examples/remote_actors/distributed_math_actor.cpp
View file @
e646ce1e
/******************************************************************************\
* This program is a distributed version of the math_actor example. *
* Client and server use a stateless request/response protocol and the client *
* is failure resilient by using a FIFO request queue. *
* The client auto-reconnects and also allows for server reconfiguration. *
* *
* Run server at port 4242: *
* - ./build/bin/distributed_math_actor -s -p 4242 *
* *
* Run client at the same host: *
* - ./build/bin/distributed_math_actor -c -p 4242 *
\******************************************************************************/
#include <vector>
#include <vector>
#include <string>
#include <string>
#include <sstream>
#include <sstream>
#include <cassert>
#include <cassert>
#include <iostream>
#include <iostream>
#include <functional>
#include <functional>
#include "cppa/opt.hpp"
#include "cppa/cppa.hpp"
#include "cppa/cppa.hpp"
using
namespace
std
;
using
namespace
std
;
using
namespace
cppa
;
using
namespace
cppa
;
using
namespace
cppa
::
placeholders
;
using
namespace
cppa
::
placeholders
;
static
const
char
*
s_usage
=
R"___(
// our service provider
Usage: distributed_math_actor_example [OPTIONS]
General options:
-h | --help Print this text and quit
-v | --version Print the program version and quit
-s | --server Run in server mode
-c | --client Run in client mode
-p <arg> | --port=<arg> Publish actor at port <arg> (server)
Connect to remote actor at port <arg> (client)
Client options:
-t <arg> | --host=<arg> Connect to host <arg>, default: localhost
)___"
;
static
const
char
*
s_interactive_usage
=
R"___(
quit Quit the program
<x> + <y> Calculate <x>+<y> and print result
<x> - <y> Calculate <x>-<y> and print result
)___"
;
static
const
char
*
s_version
=
"libcppa distributed math actor example version 1.0"
;
actor_ptr
s_printer
;
struct
math_actor
:
event_based_actor
{
struct
math_actor
:
event_based_actor
{
void
init
()
{
void
init
()
{
// execute this behavior until actor terminates
// execute this behavior until actor terminates
...
@@ -53,16 +43,97 @@ struct math_actor : event_based_actor {
...
@@ -53,16 +43,97 @@ struct math_actor : event_based_actor {
}
}
};
};
option
<
int
>
toint
(
const
string
&
str
)
{
namespace
{
if
(
str
.
empty
())
return
{};
char
*
endptr
=
nullptr
;
// this actor manages the output of the program and has a per-actor cache
int
result
=
static_cast
<
int
>
(
strtol
(
str
.
c_str
(),
&
endptr
,
10
));
actor_ptr
s_printer
=
factory
::
event_based
([](
map
<
actor_ptr
,
string
>*
out
)
{
if
(
endptr
!=
nullptr
&&
*
endptr
==
'\0'
)
{
auto
flush_output
=
[
out
](
const
actor_ptr
&
s
)
{
return
result
;
auto
i
=
out
->
find
(
s
);
if
(
i
!=
out
->
end
())
{
auto
&
ref
=
i
->
second
;
if
(
!
ref
.
empty
())
{
cout
<<
move
(
ref
)
<<
flush
;
ref
=
string
();
}
}
};
self
->
become
(
on
(
atom
(
"add"
),
arg_match
)
>>
[
=
](
string
&
str
)
{
if
(
!
str
.
empty
())
{
auto
s
=
self
->
last_sender
();
auto
i
=
out
->
find
(
s
);
if
(
i
==
out
->
end
())
{
i
=
out
->
insert
(
make_pair
(
s
,
move
(
str
))).
first
;
// monitor actor to flush its output on exit
self
->
monitor
(
s
);
}
auto
&
ref
=
i
->
second
;
ref
+=
move
(
str
);
if
(
ref
.
back
()
==
'\n'
)
{
cout
<<
move
(
ref
)
<<
flush
;
ref
=
string
();
}
}
},
on
(
atom
(
"flush"
))
>>
[
=
]
{
flush_output
(
self
->
last_sender
());
},
on
(
atom
(
"DOWN"
),
any_vals
)
>>
[
=
]
{
auto
s
=
self
->
last_sender
();
flush_output
(
s
);
out
->
erase
(
s
);
},
on
(
atom
(
"quit"
))
>>
[]
{
self
->
quit
();
},
others
()
>>
[]
{
cout
<<
"*** unexpected: "
<<
to_string
(
self
->
last_dequeued
())
<<
endl
;
}
);
}).
spawn
();
}
// namespace <anonymous>
// an output stream sending messages to s_printer
struct
actor_ostream
{
typedef
actor_ostream
&
(
*
fun_type
)(
actor_ostream
&
);
virtual
~
actor_ostream
()
{
}
virtual
actor_ostream
&
write
(
string
arg
)
{
send
(
s_printer
,
atom
(
"add"
),
move
(
arg
));
return
*
this
;
}
}
return
{};
virtual
actor_ostream
&
flush
()
{
send
(
s_printer
,
atom
(
"flush"
));
return
*
this
;
}
};
inline
actor_ostream
&
operator
<<
(
actor_ostream
&
o
,
string
arg
)
{
return
o
.
write
(
move
(
arg
));
}
template
<
typename
T
>
inline
typename
enable_if
<
is_convertible
<
T
,
string
>::
value
==
false
,
actor_ostream
&>::
type
operator
<<
(
actor_ostream
&
o
,
T
&&
arg
)
{
return
o
.
write
(
to_string
(
std
::
forward
<
T
>
(
arg
)));
}
inline
actor_ostream
&
operator
<<
(
actor_ostream
&
o
,
actor_ostream
::
fun_type
f
)
{
return
f
(
o
);
}
}
namespace
{
actor_ostream
aout
;
}
inline
actor_ostream
&
endl
(
actor_ostream
&
o
)
{
return
o
.
write
(
"
\n
"
);
}
inline
actor_ostream
&
flush
(
actor_ostream
&
o
)
{
return
o
.
flush
();
}
inline
string
&
ltrim
(
string
&
s
)
{
inline
string
&
ltrim
(
string
&
s
)
{
s
.
erase
(
s
.
begin
(),
find_if
(
s
.
begin
(),
s
.
end
(),
[](
char
c
)
{
return
!
isspace
(
c
);
}));
s
.
erase
(
s
.
begin
(),
find_if
(
s
.
begin
(),
s
.
end
(),
[](
char
c
)
{
return
!
isspace
(
c
);
}));
return
s
;
return
s
;
...
@@ -77,6 +148,36 @@ inline string& trim(std::string& s) {
...
@@ -77,6 +148,36 @@ inline string& trim(std::string& s) {
return
ltrim
(
rtrim
(
s
));
return
ltrim
(
rtrim
(
s
));
}
}
option
<
int
>
toint
(
const
string
&
str
)
{
if
(
str
.
empty
())
return
{};
char
*
endptr
=
nullptr
;
int
result
=
static_cast
<
int
>
(
strtol
(
str
.
c_str
(),
&
endptr
,
10
));
if
(
endptr
!=
nullptr
&&
*
endptr
==
'\0'
)
{
return
result
;
}
return
{};
}
template
<
typename
T
>
struct
project_helper
;
template
<
>
struct
project_helper
<
string
>
{
template
<
typename
T
>
inline
option
<
T
>
convert
(
const
string
&
from
,
typename
enable_if
<
is_integral
<
T
>::
value
>::
type
*
=
0
)
{
char
*
endptr
=
nullptr
;
auto
result
=
static_cast
<
T
>
(
strtol
(
from
.
c_str
(),
&
endptr
,
10
));
if
(
endptr
!=
nullptr
&&
*
endptr
==
'\0'
)
return
result
;
return
{};
}
};
template
<
typename
From
,
typename
To
>
option
<
To
>
projection
(
const
From
&
from
)
{
project_helper
<
From
>
f
;
return
f
.
template
convert
<
To
>(
from
);
}
void
client_repl
(
actor_ptr
server
,
string
host
,
uint16_t
port
)
{
void
client_repl
(
actor_ptr
server
,
string
host
,
uint16_t
port
)
{
typedef
cow_tuple
<
atom_value
,
int
,
int
>
request
;
typedef
cow_tuple
<
atom_value
,
int
,
int
>
request
;
// keeps track of requests and tries to reconnect on server failures
// keeps track of requests and tries to reconnect on server failures
...
@@ -96,48 +197,70 @@ void client_repl(actor_ptr server, string host, uint16_t port) {
...
@@ -96,48 +197,70 @@ void client_repl(actor_ptr server, string host, uint16_t port) {
},
},
on
(
atom
(
"result"
),
arg_match
)
>>
[
=
](
int
result
)
{
on
(
atom
(
"result"
),
arg_match
)
>>
[
=
](
int
result
)
{
if
(
q
->
empty
())
{
if
(
q
->
empty
())
{
send
(
s_printer
,
"received a result, "
aout
<<
"received a result, but didn't send a request
\n
"
;
"but didn't send a request"
);
return
;
return
;
}
}
ostringstream
oss
;
ostringstream
oss
;
auto
&
r
=
q
->
front
();
auto
&
r
=
q
->
front
();
oss
<<
get
<
1
>
(
r
)
<<
" "
aout
<<
get
<
1
>
(
r
)
<<
" "
<<
to_string
(
get
<
0
>
(
r
))
<<
" "
<<
to_string
(
get
<
0
>
(
r
))
<<
" "
<<
get
<
2
>
(
r
)
<<
get
<
2
>
(
r
)
<<
" = "
<<
result
;
<<
" = "
<<
result
send
(
s_printer
,
oss
.
str
())
;
<<
endl
;
q
->
erase
(
q
->
begin
());
q
->
erase
(
q
->
begin
());
send_next_request
();
send_next_request
();
},
},
on
(
atom
(
"DOWN"
),
arg_match
)
>>
[
=
](
uint32_t
reason
)
{
on
(
atom
(
"DOWN"
),
arg_match
)
>>
[
=
](
uint32_t
reason
)
{
ostringstream
oss
;
if
(
*
serv
==
self
->
last_sender
())
{
oss
<<
"*** server exited with reason = "
<<
reason
;
serv
->
reset
();
// sets *serv = nullptr
send
(
s_printer
,
oss
.
str
());
ostringstream
oss
;
send
(
self
,
atom
(
"reconnect"
));
aout
<<
"*** server exited with reason = "
<<
reason
<<
", try to reconnect"
<<
endl
;
send
(
self
,
atom
(
"reconnect"
));
}
},
},
on
(
atom
(
"reconnect"
))
>>
[
=
]
{
on
(
atom
(
"reconnect"
))
>>
[
=
]
{
if
(
*
serv
!=
nullptr
)
return
;
try
{
try
{
*
serv
=
remote_actor
(
host
,
port
);
*
serv
=
remote_actor
(
host
,
port
);
self
->
monitor
(
*
serv
);
self
->
monitor
(
*
serv
);
send
(
s_printer
,
"reconnection succeeded"
)
;
aout
<<
"reconnection succeeded"
<<
endl
;
send_next_request
();
send_next_request
();
}
}
catch
(
exception
&
)
{
catch
(
exception
&
)
{
send
(
s_printer
,
"reconnection failed, try again in 3s"
);
delayed_send
(
self
,
chrono
::
seconds
(
3
),
atom
(
"reconnect"
));
delayed_send
(
self
,
chrono
::
seconds
(
3
),
atom
(
"reconnect"
));
}
}
},
},
on
(
atom
(
"rebind"
),
arg_match
)
>>
[
=
](
string
&
host
,
uint16_t
port
)
{
actor_ptr
new_serv
;
try
{
new_serv
=
remote_actor
(
move
(
host
),
port
);
self
->
monitor
(
new_serv
);
aout
<<
"rebind succeeded"
<<
endl
;
*
serv
=
new_serv
;
send_next_request
();
}
catch
(
exception
&
e
)
{
aout
<<
"*** rebind failed: "
<<
to_verbose_string
(
e
)
<<
endl
;
}
},
on
(
atom
(
"quit"
))
>>
[
=
]
{
on
(
atom
(
"quit"
))
>>
[
=
]
{
self
->
quit
();
self
->
quit
();
},
},
others
()
>>
[]
{
others
()
>>
[]
{
forward_to
(
s_printer
)
;
aout
<<
"unexpected message: "
<<
self
->
last_dequeued
()
<<
endl
;
}
}
);
);
}).
spawn
(
server
);
}).
spawn
(
server
);
send
(
s_printer
,
s_interactive_usage
);
aout
<<
"quit Quit the program
\n
"
"<x> + <y> Calculate <x>+<y> and print result
\n
"
"<x> - <y> Calculate <x>-<y> and print result
\n
"
"connect <host> <port> Reconfigure server"
<<
endl
;
string
line
;
string
line
;
const
char
connect
[]
=
"connect "
;
while
(
getline
(
cin
,
line
))
{
while
(
getline
(
cin
,
line
))
{
trim
(
line
);
trim
(
line
);
if
(
line
==
"quit"
)
{
if
(
line
==
"quit"
)
{
...
@@ -145,151 +268,91 @@ void client_repl(actor_ptr server, string host, uint16_t port) {
...
@@ -145,151 +268,91 @@ void client_repl(actor_ptr server, string host, uint16_t port) {
send
(
s_printer
,
atom
(
"quit"
));
send
(
s_printer
,
atom
(
"quit"
));
return
;
return
;
}
}
bool
success
=
false
;
// the STL way of line.starts_with("connect")
auto
pos
=
find_if
(
begin
(
line
),
end
(
line
),
[](
char
c
)
{
return
c
==
'+'
||
c
==
'-'
;
});
else
if
(
equal
(
begin
(
connect
),
end
(
connect
)
-
1
,
begin
(
line
)))
{
if
(
pos
!=
end
(
line
))
{
match_split
(
line
,
' '
)
(
string
lsub
(
begin
(
line
),
pos
);
on
(
"connect"
,
val
<
string
>
,
projection
<
string
,
uint16_t
>
)
>>
[
&
](
string
&
host
,
uint16_t
port
)
{
string
rsub
(
pos
+
1
,
end
(
line
));
send
(
client
,
atom
(
"rebind"
),
move
(
host
),
port
);
auto
lhs
=
toint
(
trim
(
lsub
));
},
auto
rhs
=
toint
(
trim
(
rsub
));
others
()
>>
[]
{
if
(
lhs
&&
rhs
)
{
aout
<<
"illegal host/port definition"
<<
endl
;
auto
op
=
(
*
pos
==
'+'
)
?
atom
(
"plus"
)
:
atom
(
"minus"
);
send
(
client
,
op
,
*
lhs
,
*
rhs
);
}
else
{
if
(
!
lhs
)
{
send
(
s_printer
,
"
\"
"
+
lsub
+
"
\"
is not an integer"
);
}
}
if
(
!
rhs
)
{
);
send
(
s_printer
,
"
\"
"
+
rsub
+
"
\"
is not an integer"
);
}
else
{
bool
success
=
false
;
auto
pos
=
find_if
(
begin
(
line
),
end
(
line
),
[](
char
c
)
{
return
c
==
'+'
||
c
==
'-'
;
});
if
(
pos
!=
end
(
line
))
{
string
lsub
(
begin
(
line
),
pos
);
string
rsub
(
pos
+
1
,
end
(
line
));
auto
lhs
=
toint
(
trim
(
lsub
));
auto
rhs
=
toint
(
trim
(
rsub
));
if
(
lhs
&&
rhs
)
{
auto
op
=
(
*
pos
==
'+'
)
?
atom
(
"plus"
)
:
atom
(
"minus"
);
send
(
client
,
op
,
*
lhs
,
*
rhs
);
}
else
{
if
(
!
lhs
)
aout
<<
"
\"
"
+
lsub
+
"
\"
is not an integer"
<<
endl
;
if
(
!
rhs
)
aout
<<
"
\"
"
+
rsub
+
"
\"
is not an integer"
<<
endl
;
}
}
}
}
}
else
if
(
!
success
)
aout
<<
"*** invalid format; use: X +/- Y"
<<
endl
;
else
if
(
!
success
)
{
send
(
s_printer
,
"*** invalid format, please use: X +/- Y"
);
}
}
}
}
}
}
auto
on_opt
(
char
short_opt
,
const
char
*
long_opt
)
->
decltype
(
on
(
""
,
val
<
string
>
)
||
on
(
function
<
option
<
string
>
(
const
string
&
)
>
()))
{
const
char
short_flag_arr
[]
=
{
'-'
,
short_opt
,
'\0'
};
const
char
*
lhs_str
=
short_flag_arr
;
string
prefix
=
"--"
;
prefix
+=
long_opt
;
prefix
+=
"="
;
function
<
option
<
string
>
(
const
string
&
)
>
kvp
=
[
prefix
](
const
string
&
input
)
->
option
<
string
>
{
if
(
input
.
compare
(
0
,
prefix
.
size
(),
prefix
)
==
0
// accept '-key=' as well
||
input
.
compare
(
1
,
prefix
.
size
(),
prefix
)
==
0
)
{
return
input
.
substr
(
prefix
.
size
());
}
return
{};
};
return
on
(
lhs_str
,
val
<
string
>
)
||
on
(
kvp
);
}
auto
on_void_opt
(
char
short_opt
,
const
char
*
long_opt
)
->
decltype
(
on
<
string
>
().
when
(
_x1
.
in
(
vector
<
string
>
())))
{
const
char
short_flag_arr
[]
=
{
'-'
,
short_opt
,
'\0'
};
vector
<
string
>
opt_strs
=
{
short_flag_arr
};
opt_strs
.
push_back
(
string
(
"-"
)
+
long_opt
);
string
str
=
"-"
;
str
+=
opt_strs
.
back
();
opt_strs
.
push_back
(
std
::
move
(
str
));
return
on
<
string
>
().
when
(
_x1
.
in
(
opt_strs
));
}
int
main
(
int
argc
,
char
**
argv
)
{
int
main
(
int
argc
,
char
**
argv
)
{
s_printer
=
factory
::
event_based
([]
{
self
->
become
(
on_arg_match
>>
[](
const
string
&
str
)
{
cout
<<
str
<<
endl
;
},
on
(
atom
(
"quit"
))
>>
[]
{
self
->
quit
();
},
others
()
>>
[]
{
cout
<<
to_string
(
self
->
last_dequeued
())
<<
endl
;
}
);
}).
spawn
();
string
mode
;
string
mode
;
uint16_t
port
=
0
;
string
host
;
string
host
;
vector
<
string
>
args
(
argv
+
1
,
argv
+
argc
);
uint16_t
port
=
0
;
auto
set_mode
=
[
&
](
string
arg
)
->
bool
{
options_description
desc
;
if
(
!
mode
.
empty
())
{
auto
set_mode
=
[
&
](
const
string
&
arg
)
->
function
<
bool
()
>
{
cerr
<<
"mode already set to "
<<
mode
<<
endl
;
return
[
arg
,
&
mode
]()
->
bool
{
return
false
;
if
(
!
mode
.
empty
())
{
}
cerr
<<
"mode already set to "
<<
mode
<<
endl
;
mode
=
move
(
arg
);
return
false
;
return
true
;
};
bool
args_valid
=
!
args
.
empty
()
&&
match_stream
<
string
>
(
begin
(
args
),
end
(
args
))
(
on_opt
(
'p'
,
"port"
)
>>
[
&
](
const
string
&
arg
)
->
bool
{
auto
p
=
toint
(
arg
);
if
(
p
&&
*
p
>
1024
&&
*
p
<
0xFFFFF
)
{
port
=
static_cast
<
uint16_t
>
(
*
p
);
return
true
;
}
cerr
<<
port
<<
" is not a valid port"
<<
endl
;
return
false
;
// no match
},
on_opt
(
't'
,
"host"
)
>>
[
&
](
const
string
&
arg
)
->
bool
{
if
(
host
.
empty
())
{
host
=
arg
;
return
true
;
}
}
cerr
<<
"host previously set to
\"
"
<<
arg
<<
"
\"
"
<<
endl
;
mode
=
move
(
arg
);
return
false
;
return
true
;
},
};
on_void_opt
(
's'
,
"server"
)
>>
[
&
]()
->
bool
{
};
return
set_mode
(
"server"
);
string
copts
=
"client options"
;
},
string
sopts
=
"server options"
;
on_void_opt
(
'c'
,
"client"
)
>>
[
&
]()
->
bool
{
bool
args_valid
=
match_stream
<
string
>
(
argv
+
1
,
argv
+
argc
)
(
return
set_mode
(
"client"
);
on_opt1
(
'p'
,
"port"
,
&
desc
,
"set port"
)
>>
rd_arg
(
port
),
},
on_opt1
(
'H'
,
"host"
,
&
desc
,
"set host (default: localhost)"
,
copts
)
>>
rd_arg
(
host
),
on_void_opt
(
'h'
,
"help"
)
>>
[]
{
on_opt0
(
's'
,
"server"
,
&
desc
,
"run in server mode"
,
sopts
)
>>
set_mode
(
"server"
),
cout
<<
s_usage
<<
endl
;
on_opt0
(
'c'
,
"client"
,
&
desc
,
"run in client mode"
,
copts
)
>>
set_mode
(
"client"
),
exit
(
0
);
on_opt0
(
'h'
,
"help"
,
&
desc
,
"print help"
)
>>
print_desc_and_exit
(
&
desc
)
},
on_void_opt
(
'v'
,
"version"
)
>>
[]
{
cout
<<
s_version
<<
endl
;
exit
(
0
);
}
);
);
if
(
!
args_valid
||
port
==
0
||
mode
.
empty
()
||
(
mode
==
"server"
&&
!
host
.
empty
()))
{
if
(
!
args_valid
||
port
==
0
||
mode
.
empty
())
{
if
(
port
==
0
)
{
if
(
port
==
0
)
cerr
<<
"*** no port specified"
<<
endl
;
cerr
<<
"no port given"
<<
endl
;
if
(
mode
.
empty
())
cerr
<<
"*** no mode specified"
<<
endl
;
}
cerr
<<
endl
;
if
(
mode
.
empty
())
{
print_desc
(
&
desc
,
cerr
)();
cerr
<<
"no mode given"
<<
endl
;
}
if
(
mode
==
"server"
&&
!
host
.
empty
())
{
cerr
<<
"--host=<arg> is a client-only option"
<<
endl
;
}
cout
<<
endl
<<
s_usage
<<
endl
;
return
-
1
;
return
-
1
;
}
}
if
(
mode
==
"server"
)
{
if
(
mode
==
"server"
)
{
try
{
try
{
// try to publish math actor at given port
publish
(
spawn
<
math_actor
>
(),
port
);
publish
(
spawn
<
math_actor
>
(),
port
);
}
}
catch
(
bind_failure
&
bf
)
{
catch
(
exception
&
e
)
{
cerr
<<
"unable to publish actor at port "
cerr
<<
"*** unable to publish math actor at port "
<<
port
<<
"
\n
"
<<
port
<<
":"
<<
bf
.
what
()
<<
endl
;
<<
to_verbose_string
(
e
)
// prints exception type and e.what()
<<
endl
;
}
}
}
}
else
{
else
{
if
(
host
.
empty
())
{
if
(
host
.
empty
())
host
=
"localhost"
;
host
=
"localhost"
;
}
try
{
try
{
auto
server
=
remote_actor
(
host
,
port
);
auto
server
=
remote_actor
(
host
,
port
);
client_repl
(
server
,
host
,
port
);
client_repl
(
server
,
host
,
port
);
}
}
catch
(
exception
&
e
)
{
catch
(
exception
&
e
)
{
cerr
<<
"unable to connect to remote actor at host
\"
"
cerr
<<
"unable to connect to remote actor at host
\"
"
<<
host
<<
"
\"
on port "
<<
port
<<
endl
;
<<
host
<<
"
\"
on port "
<<
port
<<
"
\n
"
<<
to_verbose_string
(
e
)
<<
endl
;
}
}
}
}
await_all_others_done
();
await_all_others_done
();
...
...
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