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dd� Zeddd��Zedd� �ZdS )� DateTemplatez�A template which searches for and returns a date from a log line.
This is an not functional abstract class which other templates should
inherit from.
Attributes
----------
name
regex
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S ) a� Sets regex to use for searching for date in log line.
Parameters
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regex : str
The regex the template will use for searching for a date.
wordBegin : bool
Defines whether the regex should be modified to search at beginning of a
word, by adding special boundary r'(?=^|\b|\W)' to start of regex.
Can be disabled with specifying of ** at front of regex.
Default True.
wordEnd : bool
Defines whether the regex should be modified to search at end of a word,
by adding special boundary r'(?=\b|\W|$)' to end of regex.
Can be disabled with specifying of ** at end of regex.
Default True.
Raises
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re.error
If regular expression fails to compile
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^(?:\W{0,2})?z {^LN-BEG}z (?=\b|\W|$)� z constructed regex %sN)�strip�RE_NO_WRD_BOUND_BEG�search�RE_NO_WRD_BOUND_END�
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zDateTemplate.setRegexz!Regex used to search for date.
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t�| j�| _ W dS ty$ } z t�d| j| j� |�d}~ww dS )z Compile regex by first usage.
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_compileRegex� s ���zDateTemplate._compileRegexc G s8 | j s| �� | j j|g|�R � }|r| jd7 _|S )z1Check if regex for date matches on a log line.
r )r r@ r% r )r �line�args� dateMatchr r r � matchDate� s zDateTemplate.matchDateNc C s t d��)aQ Abstract method, which should return the date for a log line
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date from the part of the line which matched the templates regex.
This requires abstraction, therefore just raises exception.
Parameters
----------
line : str
Log line, of which the date should be extracted from.
default_tz: if no explicit time zone is present in the line
passing this will interpret it as in that time zone.
Raises
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NotImplementedError
Abstract method, therefore always returns this.
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default_tzr r r �getDate� s zDateTemplate.getDatec
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� DateEpochz�A date template which searches for Unix timestamps.
This includes Unix timestamps which appear at start of a line, optionally
within square braces (nsd), or on SELinux audit log lines.
Attributes
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name
regex
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zDateEpoch.__init__c C sn |s| � |�}|r5|�| j�}| jr/t|�dkr/t|�dkr)d|vr)t|�d }nt|�d }t|�|fS dS )ax Method to return the date for a log line.
Parameters
----------
line : str
Log line, of which the date should be extracted from.
default_tz: ignored, Unix timestamps are time zone independent
Returns
-------
(float, str)
Tuple containing a Unix timestamp, and the string of the date
which was matched and in turned used to calculated the timestamp.
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dd d �Z� ZS )�DatePatternRegexz�Date template, with regex/pattern
Parameters
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pattern : str
Sets the date templates pattern.
Attributes
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name
regex
pattern
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�zDatePatternRegex.__init__c C r )aV The pattern used for regex with strptime "%" time fields.
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will be extracted from the log line. strptime style "%" fields will
be replaced by appropriate regular expressions, or custom regex
groups with names as per the strptime fields can also be used
instead.
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��zDatePatternRegex.setRegexc C s* |s| � |�}|rt|�� |d�|fS dS )a� Method to return the date for a log line.
This uses a custom version of strptime, using the named groups
from the instances `pattern` property.
Parameters
----------
line : str
Log line, of which the date should be extracted from.
default_tz: optionally used to correct timezone
Returns
-------
(float, str)
Tuple containing a Unix timestamp, and the string of the date
which was matched and in turned used to calculated the timestamp.
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DateTai64nz`A date template which matches TAI64N formate timestamps.
Attributes
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name
regex
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zDateTai64n.__init__Nc C s: |s| � |�}|r|�d�}|dd� }t|d�|fS dS )aq Method to return the date for a log line.
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----------
line : str
Log line, of which the date should be extracted from.
default_tz: ignored, since TAI is time zone independent
Returns
-------
(float, str)
Tuple containing a Unix timestamp, and the string of the date
which was matched and in turned used to calculated the timestamp.
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