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Julia websockets - what is readguarded and writeguarded?

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1

I noticed in the Julia websockets API, there are functions called readguarded and writeguarded. What exactly are these for?

The docs seem to explain that these are used to log errors, but is that all that they do?

When using readguarded or writeguarded, errors are logged with @debug
statements. Set the logging level of the logger you use to 'Debug', as
in 'examples/count_with_logger.jl'.

websocket julia

share|improve this question

asked Mar 23 at 19:17

Arthur ColléArthur Collé

1,20741930

add a comment | 

1

I noticed in the Julia websockets API, there are functions called readguarded and writeguarded. What exactly are these for?

The docs seem to explain that these are used to log errors, but is that all that they do?

When using readguarded or writeguarded, errors are logged with @debug
statements. Set the logging level of the logger you use to 'Debug', as
in 'examples/count_with_logger.jl'.

websocket julia

share|improve this question

asked Mar 23 at 19:17

Arthur ColléArthur Collé

1,20741930

add a comment | 

I noticed in the Julia websockets API, there are functions called readguarded and writeguarded. What exactly are these for?

The docs seem to explain that these are used to log errors, but is that all that they do?

When using readguarded or writeguarded, errors are logged with @debug
statements. Set the logging level of the logger you use to 'Debug', as
in 'examples/count_with_logger.jl'.

websocket julia

share|improve this question

asked Mar 23 at 19:17

Arthur ColléArthur Collé

1,20741930

share|improve this question

asked Mar 23 at 19:17

Arthur ColléArthur Collé

1,20741930

share|improve this question

asked Mar 23 at 19:17

Arthur ColléArthur Collé

1,20741930

asked Mar 23 at 19:17

Arthur ColléArthur Collé

1,20741930

asked Mar 23 at 19:17

Arthur ColléArthur Collé

1,20741930

1 Answer
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1

The designers of Julia's Socket routines decided to have the read and write socket routines throw an exception on failure, similar to the exception thrown by the file open routines on error. The readguarded and writeguarded routines are socket read and write routines wrapped in try-catch, so that they can return an error on exception as below, from the WebSockets.jl source code:

function readguarded(ws)
 data = VectorUInt8()
 success = true
 try
 data = read(ws)
 catch err
 @debug err
 data = VectorUInt8()
 success = false
 finally
 return data, success
 end
end

The @debug statements are then used to log errors with use of the Logging library, since those errors are otherwise caught and hidden (by design) within the readguarded and writeguarded routines.

share|improve this answer

answered Mar 25 at 22:19

BillBill

87658

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1

The designers of Julia's Socket routines decided to have the read and write socket routines throw an exception on failure, similar to the exception thrown by the file open routines on error. The readguarded and writeguarded routines are socket read and write routines wrapped in try-catch, so that they can return an error on exception as below, from the WebSockets.jl source code:

function readguarded(ws)
 data = VectorUInt8()
 success = true
 try
 data = read(ws)
 catch err
 @debug err
 data = VectorUInt8()
 success = false
 finally
 return data, success
 end
end

The @debug statements are then used to log errors with use of the Logging library, since those errors are otherwise caught and hidden (by design) within the readguarded and writeguarded routines.

share|improve this answer

answered Mar 25 at 22:19

BillBill

87658

add a comment | 

1

The designers of Julia's Socket routines decided to have the read and write socket routines throw an exception on failure, similar to the exception thrown by the file open routines on error. The readguarded and writeguarded routines are socket read and write routines wrapped in try-catch, so that they can return an error on exception as below, from the WebSockets.jl source code:

function readguarded(ws)
 data = VectorUInt8()
 success = true
 try
 data = read(ws)
 catch err
 @debug err
 data = VectorUInt8()
 success = false
 finally
 return data, success
 end
end

The @debug statements are then used to log errors with use of the Logging library, since those errors are otherwise caught and hidden (by design) within the readguarded and writeguarded routines.

share|improve this answer

answered Mar 25 at 22:19

BillBill

87658

add a comment | 

The designers of Julia's Socket routines decided to have the read and write socket routines throw an exception on failure, similar to the exception thrown by the file open routines on error. The readguarded and writeguarded routines are socket read and write routines wrapped in try-catch, so that they can return an error on exception as below, from the WebSockets.jl source code:

function readguarded(ws)
 data = VectorUInt8()
 success = true
 try
 data = read(ws)
 catch err
 @debug err
 data = VectorUInt8()
 success = false
 finally
 return data, success
 end
end

The @debug statements are then used to log errors with use of the Logging library, since those errors are otherwise caught and hidden (by design) within the readguarded and writeguarded routines.

share|improve this answer

answered Mar 25 at 22:19

BillBill

87658

function readguarded(ws)
 data = VectorUInt8()
 success = true
 try
 data = read(ws)
 catch err
 @debug err
 data = VectorUInt8()
 success = false
 finally
 return data, success
 end
end

share|improve this answer

answered Mar 25 at 22:19

BillBill

87658

answered Mar 25 at 22:19

BillBill

87658

answered Mar 25 at 22:19

BillBill

87658