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https://github.com/zeek/zeek.git
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d5fd29edcd
While we support initializing records via coercion from an expression
list, e.g.,
local x: X = [$x1=1, $x2=2];
this can sometimes obscure the code to readers, e.g., when assigning to
value declared and typed elsewhere. The language runtime has a similar
overhead since instead of just constructing a known type it needs to
check at runtime that the coercion from the expression list is valid;
this can be slower than just writing the readible code in the first
place, see #4559.
With this patch we use explicit construction, e.g.,
local x = X($x1=1, $x2=2);
65 lines
1.9 KiB
Text
65 lines
1.9 KiB
Text
@load base/utils/exec
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@load base/frameworks/reporter
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@load base/utils/paths
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module Dir;
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export {
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## The default interval this module checks for files in directories when
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## using the :zeek:see:`Dir::monitor` function.
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option polling_interval = 30sec;
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## Register a directory to monitor with a callback that is called
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## every time a previously unseen file is seen. If a file is deleted
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## and seen to be gone, then the file is available for being seen again
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## in the future.
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##
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## dir: The directory to monitor for files.
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##
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## callback: Callback that gets executed with each file name
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## that is found. Filenames are provided with the full path.
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##
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## poll_interval: An interval at which to check for new files.
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global monitor: function(dir: string, callback: function(fname: string),
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poll_interval: interval &default=polling_interval);
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}
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event Dir::monitor_ev(dir: string, last_files: set[string],
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callback: function(fname: string),
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poll_interval: interval)
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{
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when [dir, last_files, callback, poll_interval] ( local result = Exec::run(Exec::Command($cmd=fmt("ls -1 %s/", safe_shell_quote(dir)))) )
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{
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if ( result$exit_code != 0 )
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{
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Reporter::warning(fmt("Requested monitoring of nonexistent directory (%s).", dir));
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return;
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}
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local current_files: set[string] = set();
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local files: vector of string = vector();
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if ( result?$stdout )
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files = result$stdout;
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for ( i in files )
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{
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if ( files[i] !in last_files )
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callback(build_path_compressed(dir, files[i]));
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add current_files[files[i]];
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}
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schedule poll_interval
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{
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Dir::monitor_ev(dir, current_files, callback, poll_interval)
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};
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}
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}
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function monitor(dir: string, callback: function(fname: string),
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poll_interval: interval &default=polling_interval)
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{
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event Dir::monitor_ev(dir, set(), callback, poll_interval);
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}
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