sockets - Python 3.4 listening to selected server and port -

-

this code can create socket, connect selected server , port, , print reply. have question, how can listening port longer 1 moment? e.g. want listen selected port 20 seconds , print packets come @ time. possible code?

import socket import sys  try:     s = socket.socket(socket.af_inet, socket.sock_stream)  except socket.error msg:     print("failed create socket. error code: " + str(msg[0]) + ' , error message : ' + msg[1])     sys.exit();  print('socket created')  host = #server port = #port try:     remote_ip = socket.gethostbyname( host )  except socket.gaierror:     print('hostname not resolved. exiting')     sys.exit()  print('ip address of ' + host + ' ' + remote_ip)  s.connect((remote_ip , port))  print('socket connected ' + host + ' on ip ' + remote_ip)  reply = s.recv(4096)  print(reply)

you try setting timeout socket should fit requirement if understand correctly need wait 1 time 20 seconds.

s.settimeout(20) reply = s.recv(4096)

python socket settimeout()

however not guaranteed data packets delivered @ once. mentioned in comment, should looping. way place socket in nonblocking mode.

outside of loop, need buffer_variable hold total results recv().

prior entering loop, start timer. upon entering loop begin calling recv() on socket while saving result in local_variable. each time new in local_variable append buffer_variable.

when timer expires, break loop, , process data buffer_variable accordingly.


Comments

Post a Comment

Popular posts from this blog

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null
Read more

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops',
Read more

c# - TransactionScope not rolling back although no complete() is called -

-
i'm using transactionscope rollback transaction fail bool errorreported = false; action<importerrorlog> newerrorcallback = e => { errorreported = true; errorcallback(e); }; using (var transaction = new transactionscope()) { foreach (importtaskdefinition task in taskdefinition) { loader.load(streamfile, newerrorcallback, task.destinationtable, processingtaskid); } if (!errorreported) transaction.complete(); } i'm sure there no transactionscope started ahead or after code. i'm using entity framework insert in db. regardless state of errorreported transaction never rolled in case of error. what missing ? transactionscope sets transaction.current . that's does. wants transacted must @ property. i believe ef each time connection opened reason. probably, connection open when scope installed. open connection inside of scope or enlist manually. ef has nasty "design decision": default opens
Read more