Suppose I have a Sinatra app that simply prints out random numbers from 0-9:
get '/' do
rand(10)
end
I want to make sure that the app does not print out the same number as last time (so it's not really random -- this is just a toy example, in any case):
# I want to do something like this... This code doesn't work.
prev_rand = nil
get '/' do
curr_rand = rand(10)
while prev_rand and curr_rand == prev_rand
curr_rand = rand(10)
end
prev_rand = curr_rand
curr_rand
end
How would I do this? Using the above example doesn't quite work, as the prev_rand inside the get '/' block is a local variable (not the same as the one outside the block), so changing its value doesn't persist.
(I don't quite understand Sinatra scope.)
You could store "prev_rand" as a setting, which is an application-level variable that's accessible within the request context via the "settings" object:
configure do
set :prev_rand, nil
end
get '/' do
begin
curr_rand = rand(10)
end while curr_rand == settings.prev_rand
set :prev_rand, curr_rand
curr_rand
end
For more info: http://www.sinatrarb.com/configuration.html
Related
I have this function that when hitting a rate limit will call itself again. It should eventually succeed and return the working data. It works normally then rate limiting works as expected, and finally when the data goes back to normal I get:
TypeError: 'NoneType' object is not subscriptable
def grabPks(pageNum):
# cloudflare blocks bots...use scraper library to get around this or build your own logic to store and use a manually generated cloudflare session cookie... I don't care 😎
req = scraper.get("sumurl.com/"+str(pageNum)).content
if(req == b'Rate Limit Exceeded'):
print("adjust the rate limiting because they're blocking us :(")
manPenalty = napLength * 3
print("manually sleeping for {} seconds".format(manPenalty))
time.sleep(manPenalty)
print("okay let's try again... NOW SERVING {}".format(pageNum))
grabPks(pageNum)
else:
tree = html.fromstring(req)
pk = tree.xpath("/path/small/text()")
resCmpress = tree.xpath("path/a//text()")
resXtend = tree.xpath("[path/td[2]/small/a//text()")
balance = tree.xpath("path/font//text()")
return pk, resCmpress, resXtend, balance
I've tried to move the return to outside of the else scope but then it throws:
UnboundLocalError: local variable 'pk' referenced before assignment
Your top level grabPks doesnt return anything if it is rate limited.
Think about this:
Call grabPks()
You're rate limited so you go into the if statement and call grabPks() again.
This time it succeeds so grabPks() returns the value to the function above it.
The first function now falls out of the if statement, gets to the end of the function and returns nothing.
Try return grabPks(pageNum) instead inside your if block.
well okay... I needed to return grabPKs to make it play nice...:
def grabPks(pageNum):
# cloudflare blocks bots...use scraper library to get around this or build your own logic to store and use a manually generated cloudflare session cookie... I don't care 😎
req = scraper.get("sumurl.com/"+str(pageNum)).content
if(req == b'Rate Limit Exceeded'):
print("adjust the rate limiting because they're blocking us :(")
manPenalty = napLength * 3
print("manually sleeping for {} seconds".format(manPenalty))
time.sleep(manPenalty)
print("okay let's try again... NOW SERVING {}".format(pageNum))
return grabPks(pageNum)
else:
tree = html.fromstring(req)
pk = tree.xpath("/path/small/text()")
resCmpress = tree.xpath("path/a//text()")
resXtend = tree.xpath("[path/td[2]/small/a//text()")
balance = tree.xpath("path/font//text()")
return pk, resCmpress, resXtend, balance
when implementing Origen::Parameters, I understood the importance of defining a 'default' set. But, in essence, my real default is named something different. So I implemented a hack of a parameter alias:
Origen.top_level.define_params :default do |params|
params.tconds.override = 1
params.tconds.override_lev_equ_set = 1
params.tconds.override_lev_spec_set = 1
params.tconds.override_levset = 1
params.tconds.override_seqlbl = 'my_pattern'
params.tconds.override_testf = 'tm_3'
params.tconds.override_tim_spec_set = 'bist_xxMhz'
params.tconds.override_timset = '1,1,1,1,1,1,1,1'
params.tconds.site_control = 'parallel:'
params.tconds.site_match = 2
end
Origen.top_level.define_params :cpu_mbist_hr, inherit: :default do |params|
# way of aliasing parameter names
end
Is there a proper method of parameter aliasing that is just not documented?
There is no other way to do this currently, though I would be open to a PR to enable something like:
default_params = :cpu_mbist_hr
If you don't want them to be called :default in this case though, then maybe you don't really want them to be the default anyway.
e.g. adding this immediately after you define them would effectively give you an alternative default and would do pretty much the same job as the proposed API above:
# self is required here to help Ruby know that you are calling the params= API
# and not defining a local variable called params
self.params = :cpu_mbist_hr
Can Matlab eliminate the path in URL and leave only the domain part? Does Matlab have any function to eliminate the path behind?
Let's say, example 1:
input :http://www.mathworks.com/help/images/removing-noise-from-images.html
output :http://www.mathworks.com
This regexp pattern should do the trick:
>> str = 'http://www.mathworks.com/help/images/removing-noise-from-images.html';
>> out = regexp(str,'\w*://[^/]*','match','once')
out =
'http://www.mathworks.com'
The search pattern '\w*://[^/]*' says look for a string that starts with some "word" characters ('\w*) corresponding to the protocol (e.g. http, https, rtsp), followed by the ubiquitous ://, and then any number of characters that are not a forward slash ([^/]*).
Edit: The 'once' option should eliminate a nested cell.
UPDATE: just the hostname, allowing inputs with no protocol.
>> str = {'http://www.mathworks.com/help/images/removing-noise-from-images.html';
'https://www.mathworks.com/help/matlab/ref/strcmpi#dfvfv.html';
'google.com/voice'}
>> out = regexp(str,'([^/]*)(?=/[^/])','match','once')
out =
'www.mathworks.com'
'www.mathworks.com'
'google.com'
UPDATE 2: regexp madness!
>> str = {'http://www.mathworks.com/help/images/removing-noise-from-images.html';
'https://www.mathworks.com/help/matlab/ref/strcmpi#dfvfv.html';
'google.com/voice';
'http://monkey.org/';
'stackoverflow.com/';
'meta.stackoverflow.com'};
>> out = regexp(str,'.*?[^/](?=(/([^/]|$)|$))','match','once')
out =
'http://www.mathworks.com'
'https://www.mathworks.com'
'google.com'
'http://monkey.org'
'stackoverflow.com'
'meta.stackoverflow.com'
% hostname.m
function hostnames = hostname(str)
hostnames = regexp(str,'.*?[^/](?=(/([^/]|$)|$))','match','once');
Code:
function output_url = domain_name(input_url)
c1 = strfind(input_url,'//');
ind1 = strfind(input_url,'/');
if isempty(c1) && isempty(ind1)
output_url = input_url; % For case like - www.mathworks.com
return;
end
if ~isempty(c1)
if numel(ind1)>2
output_url = input_url(1:ind1(3)-1); % For cases like - http://www.mathworks.com/ or http://www.mathworks.com/something/
else
output_url = input_url; % For case like - http://www.mathworks.com
end
else
output_url = input_url(1:ind1(1)-1); % For cases like - www.mathworks.com/ or www.mathworks.com/something/
end
return;
Example runs:
%% Long URLs with extensions
disp(domain_name('www.mathworks.com/help/images/removing-noise-from-images.html'))
disp(domain_name('http://www.mathworks.com/help/images/removing-noise-from-images.html'))
%% Short URLs without HTTP://
disp(domain_name('www.mathworks.com'))
disp(domain_name('www.mathworks.com/'))
%% Short URLs with HTTP://
disp(domain_name('http://www.mathworks.com'))
disp(domain_name('http://www.mathworks.com/'))
Return:
www.mathworks.com
http://www.mathworks.com
www.mathworks.com
www.mathworks.com
http://www.mathworks.com
http://www.mathworks.com
An alternative method and probably efficient one would be to use REGEXP, but apparently I prefer numbers.
Edit 1: If you prefer to use bunch of URLs at the sametime, you may use a cell array. Obviously, the output would be a cell array too. Look at the following MATLAB script to get a feel of it -
% Input
in_urls_cell = [{'http://mathworks.com/'},{'mathworks.com/help/matlab/ref/strcmpi.html'},{'mathworks.com/help/matlab/ref/strcmpi#dfvfv.html'}];
% Get domain name
out_urls_cell = cell(size(in_urls_cell));
for count = 1:numel(in_urls_cell)
out_urls_cell(count)={domain_name(cell2mat(in_urls_cell(count)))};
end
% Display only domain name
for count = 1:numel(out_urls_cell)
disp(cell2mat(out_urls_cell(count)));
end
The above script returns -
http://mathworks.com
mathworks.com
mathworks.com
I was trying to use threading for parsing two different types of files. The subroutines share no data at all.
# Parse header files
$hdr_thrd = threads -> create(\&Parser::parse_header_file, $path);
# Parse input template files
$tmplt_thrd = threads -> create(\&TemplateParser::parse_template);
# Join the threads
$tmplt_thrd -> join();
$hdr_thrd -> join();
# This uses the data obtained from the above two threads
&Parser::parse_xml_template();
The problem comes when the parse_xml_template function tries to access an array #TemplateParser::array. The array has no data at this point but it is getting filled inside the parse_template function. Am I missing something?
You're trying to share data across threads without sharing it. You need to use :shared or share() on the variable.
You wouldn't have this problem at all if you were to avoid global vars as you should.
sub parse_template {
my #tmplt_result;
...
return \#tmplt_result;
}
my $hdr_thrd = threads->create(\&Parser::parse_header_file, $path);
my $tmplt_thrd = threads->create(\&TemplateParser::parse_template);
my $tmplt_result = $tmplt_thrd->join();
my $hdr_result = $hdr_thrd->join();
(Explicit sharing is not necessary to when returning a value via join.)
Of course, that needlessly creates two threads (for a total of three) when two would suffice. Instead, you could use:
sub parse_template {
my #tmplt_result;
...
return \#tmplt_result;
}
my $hdr_thrd = threads->create(\&Parser::parse_header_file, $path);
my $tmplt_result = TemplateParser::parse_template();
my $hdr_result = $hdr_thrd->join();
I'm trying to make a system which backs up and restores points for a gameserver, so it can safely restart without loosing anything.
I have made a script to do just this and the actual backing up part works fine, but the restore part does not.
This is the script that runs if 'Backup(read)' is used (Backup(write) works perfectly as it is designed to do):
if (source and read) then
System.LogAlways("[System] Restoring serverdata from file 'backup.CHK'");
for line in source:lines() do
Backup = {};
Backup.Date = (Date or line:match("File Last Modified: (.-)"));
Backup.Time = (Time or line:match("time: (.-)"));
US = tonumber((US or line:match("us: (.-)")));
NK = tonumber((NK or line:match("nk: (.-)")));
local params = {class = "Player";
position = {x = 1, y = 1, z = -1000};
Respawn = { bRespawn = 0; nTimer =0; bUnique = 1; };
bUsable = 0;
orientation = {0, 90, 135};
name = "BackupEntity"; };
local ent = System.SpawnEntity(params);
g_gameRules.game:SetTeam(1, ent.id);
g_gameRules.game:SetSynchedEntityValue(playerId, 100, (NK/3));
g_gameRules.game:SetTeam(2, ent.id);
g_gameRules.game:SetSynchedEntityValue(playerId, 100, (US/3));
System.RemoveEntity(params);
end
source:close();
return;
end
I'm not sure what I'm doing wrong,and most sites that I have looked at don't help that much. The problem is that it's not reading any values from the file.
Any help will be appreciated :).
Edit:
The reason that we have to divide the score by 3 is because the server multiplies all scores by 3. If we were not to divide it by 3, then the score will always be 3 times larger on each restore.
Example contents of the backup.CHK file:
The server is dependent on this file, and writes to it every hour. Please do not edit.
File Last Modified: 11/07/2013
This file was generated by the servers' autobackup system.
--------------------------
time: 22:51
us: 453445
nk: 454567
A couple of ideas of what might be causing the problem:
Use of (.-) lazy matching which matches the shortest pattern possible -- this can include an empty string. Usually, you want to make the pattern as specific as possible while still matching the required possible inputs. eg. It looks like (%d+) for us and nk is an appropriate fit.
The for line in source:lines() do reads one line at a time. That necessarily means not all the variables are going to be set inside the loop. Yet everything starting at local params and down uses those variables as if they were. It seems to me that section of code shouldn't even be in the loop.
Lastly, have you considered saving the Backup file as just another lua file? Doing so means you can let lua do the heavy lifting for you and you won't have to bother parsing it yourself. That also minimizes the risk for error.