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python-shell/index.js at a4bfc3ccb87f4e56277ecc0f551e87f2003f4484 · astams/python-shell · GitHub
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python-shell
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index.js
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var
EventEmitter
=
require
(
'events'
)
.
EventEmitter
;
var
path
=
require
(
'path'
)
;
var
util
=
require
(
'util'
)
;
var
spawn
=
require
(
'child_process'
)
.
spawn
;
function
toArray
(
source
)
{
if
(
typeof
source
===
'undefined'
||
source
===
null
)
{
return
[
]
;
}
else
if
(
!
Array
.
isArray
(
source
)
)
{
return
[
source
]
;
}
return
source
;
}
function
extend
(
obj
)
{
Array
.
prototype
.
slice
.
call
(
arguments
,
1
)
.
forEach
(
function
(
source
)
{
if
(
source
)
{
for
(
var
key
in
source
)
{
obj
[
key
]
=
source
[
key
]
;
}
}
}
)
;
return
obj
;
}
/**
* An interactive Python shell exchanging data through stdio
*
@param
{
string
} script The python script to execute
*
@param
{
object
} [options] The launch options (also passed to child_process.spawn)
*
@constructor
*/
var
PythonShell
=
function
(
script
,
options
)
{
var
self
=
this
;
var
errorData
=
''
;
EventEmitter
.
call
(
this
)
;
options
=
extend
(
{
}
,
PythonShell
.
defaultOptions
,
options
)
;
var
pythonPath
=
options
.
pythonPath
||
'python'
;
var
pythonOptions
=
toArray
(
options
.
pythonOptions
)
;
var
scriptArgs
=
toArray
(
options
.
args
)
;
this
.
script
=
path
.
join
(
options
.
scriptPath
||
'./python'
,
script
)
;
this
.
command
=
pythonOptions
.
concat
(
this
.
script
,
scriptArgs
)
;
this
.
mode
=
options
.
mode
||
'text'
;
this
.
parser
=
options
.
parser
;
this
.
terminated
=
false
;
this
.
childProcess
=
spawn
(
pythonPath
,
this
.
command
,
options
)
;
[
'stdout'
,
'stdin'
,
'stderr'
]
.
forEach
(
function
(
name
)
{
self
[
name
]
=
self
.
childProcess
[
name
]
;
self
.
mode
!==
'binary'
&&
self
[
name
]
.
setEncoding
(
'utf8'
)
;
}
)
;
// listen for incoming data on stdout
this
.
stdout
.
on
(
'data'
,
function
(
data
)
{
self
.
mode
!==
'binary'
&&
self
.
receive
(
data
)
;
}
)
;
// listen to stderr and emit errors for incoming data
this
.
stderr
.
on
(
'data'
,
function
(
data
)
{
errorData
+=
''
+
data
;
}
)
;
this
.
childProcess
.
on
(
'exit'
,
function
(
code
)
{
var
err
;
if
(
errorData
||
code
!==
0
)
{
if
(
errorData
)
{
err
=
self
.
parseError
(
errorData
)
;
}
else
{
err
=
new
Error
(
'process exited with code '
+
code
)
;
}
err
=
extend
(
err
,
{
executable
:
pythonPath
,
options
:
pythonOptions
.
length
?
pythonOptions
:
null
,
script
:
self
.
script
,
args
:
scriptArgs
.
length
?
scriptArgs
:
null
,
exitCode
:
code
}
)
;
// do not emit error if only a callback is used
if
(
self
.
listeners
(
'error'
)
.
length
||
!
self
.
_endCallback
)
{
self
.
emit
(
'error'
,
err
)
;
}
}
self
.
exitCode
=
code
;
self
.
terminated
=
true
;
self
.
emit
(
'close'
)
;
self
.
_endCallback
&&
self
.
_endCallback
(
err
)
;
}
)
;
}
;
util
.
inherits
(
PythonShell
,
EventEmitter
)
;
// allow global overrides for options
PythonShell
.
defaultOptions
=
{
}
;
/**
* Runs a Python script and returns collected messages
*
@param
{
string
} script The script to execute
*
@param
{
Object
} options The execution options
*
@param
{
Function
} callback The callback function to invoke with the script results
*
@return
{
PythonShell
} The PythonShell instance
*/
PythonShell
.
run
=
function
(
script
,
options
,
callback
)
{
if
(
typeof
options
===
'function'
)
{
callback
=
options
;
options
=
null
;
}
var
pyshell
=
new
PythonShell
(
script
,
options
)
;
var
output
=
[
]
;
return
pyshell
.
on
(
'message'
,
function
(
message
)
{
output
.
push
(
message
)
;
}
)
.
end
(
function
(
err
)
{
if
(
err
)
return
callback
(
err
)
;
return
callback
(
null
,
output
.
length
?
output
:
null
)
;
}
)
;
}
;
/**
* Parses an error thrown from the Python process through stderr
*
@param
{
string|Buffer
} data The stderr contents to parse
*
@return
{
Error
} The parsed error with extended stack trace when traceback is available
*/
PythonShell
.
prototype
.
parseError
=
function
(
data
)
{
var
text
=
''
+
data
;
var
error
;
if
(
/
^
T
r
a
c
e
b
a
c
k
/
.
test
(
text
)
)
{
// traceback data is available
var
lines
=
(
''
+
data
)
.
trim
(
)
.
split
(
/
\n
/
g
)
;
var
exception
=
lines
.
pop
(
)
;
error
=
new
Error
(
exception
)
;
error
.
traceback
=
data
;
// extend stack trace
error
.
stack
+=
'\n ----- Python Traceback -----\n '
;
error
.
stack
+=
lines
.
slice
(
1
)
.
join
(
'\n '
)
;
}
else
{
// otherwise, create a simpler error with stderr contents
error
=
new
Error
(
text
)
;
}
return
error
;
}
;
/**
* Sends a message to the Python shell through stdin
* This method
* Override this method to format data to be sent to the Python process
*
@param
{
string|Object
} data The message to send
*
@returns
{
PythonShell
} The same instance for chaining calls
*/
PythonShell
.
prototype
.
send
=
function
(
message
)
{
if
(
this
.
mode
===
'binary'
)
{
throw
new
Error
(
'cannot send a message in binary mode, use stdin directly instead'
)
;
}
else
if
(
this
.
mode
===
'json'
)
{
// write a JSON formatted message
this
.
stdin
.
write
(
JSON
.
stringify
(
message
)
+
'\n'
)
;
}
else
{
// write text-based message (default)
if
(
typeof
message
!==
'string'
)
message
=
message
.
toString
(
)
;
this
.
stdin
.
write
(
message
+
'\n'
)
;
}
return
this
;
}
;
/**
* Parses data received from the Python shell stdout stream and emits "message" events
* This method is not used in binary mode
* Override this method to parse incoming data from the Python process into messages
*
@param
{
string|Buffer
} data The data to parse into messages
*/
PythonShell
.
prototype
.
receive
=
function
(
data
)
{
var
self
=
this
;
var
lines
=
(
''
+
data
)
.
split
(
/
\n
/
g
)
;
if
(
lines
.
length
===
1
)
{
// an incomplete record, keep buffering
this
.
_remaining
=
(
this
.
_remaining
||
''
)
+
lines
[
0
]
;
return
this
;
}
var
lastLine
=
lines
.
pop
(
)
;
// fix the first line with the remaining from the previous iteration of 'receive'
lines
[
0
]
=
(
this
.
_remaining
||
''
)
+
lines
[
0
]
;
// keep the remaining for the next iteration of 'receive'
this
.
_remaining
=
lastLine
;
lines
.
forEach
(
function
(
line
)
{
if
(
self
.
parser
)
{
try
{
self
.
emit
(
'message'
,
self
.
parser
(
line
)
)
;
}
catch
(
err
)
{
self
.
emit
(
'error'
,
extend
(
new
Error
(
'invalid message: '
+
data
+
' >> '
+
err
)
,
{
inner
:
err
,
data
:
line
}
)
)
;
}
}
else
if
(
self
.
mode
===
'json'
)
{
try
{
self
.
emit
(
'message'
,
JSON
.
parse
(
line
)
)
;
}
catch
(
err
)
{
self
.
emit
(
'error'
,
extend
(
new
Error
(
'invalid JSON message: '
+
data
+
' >> '
+
err
)
,
{
inner
:
err
,
data
:
line
}
)
)
;
}
}
else
{
self
.
emit
(
'message'
,
line
)
;
}
}
)
;
return
this
;
}
;
/**
* Closes the stdin stream, which should cause the process to finish its work and close
*
@returns
{
PythonShell
} The same instance for chaining calls
*/
PythonShell
.
prototype
.
end
=
function
(
callback
)
{
this
.
childProcess
.
stdin
.
end
(
)
;
this
.
_endCallback
=
callback
;
return
this
;
}
;
module
.
exports
=
PythonShell
;
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