130 lines
4.3 KiB
Markdown
130 lines
4.3 KiB
Markdown
For code reference, see: [`my.core.denylist.py`](../my/core/denylist.py)
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A helper module for defining denylists for sources programmatically (in layman's terms, this lets you remove some particular output from a module you don't want)
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Lets you specify a class, an attribute to match on,
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and a JSON file containing a list of values to deny/filter out
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As an example, this will use the `my.ip` module, as filtering incorrect IPs was the original use case for this module:
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```python
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class IP(NamedTuple):
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addr: str
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dt: datetime
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```
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A possible denylist file would contain:
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```json
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[
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{
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"addr": "192.168.1.1",
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},
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{
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"dt": "2020-06-02T03:12:00+00:00",
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}
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]
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```
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Note that if the value being compared to is not a single (non-array/object) JSON primitive
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(str, int, float, bool, None), it will be converted to a string before comparison
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To use this in code:
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```python
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from my.ip.all import ips
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filtered = DenyList("~/data/ip_denylist.json").filter(ips())
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```
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To add items to the denylist, in python (in a one-off script):
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```python
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from my.ip.all import ips
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from my.core.denylist import DenyList
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d = DenyList("~/data/ip_denylist.json")
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for ip in ips():
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# some custom code you define
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if ip.addr == ...:
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d.deny(key="ip", value=ip.ip)
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d.write()
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```
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... or interactively, which requires [`fzf`](https://github.com/junegunn/fzf) and [`pyfzf-iter`](https://pypi.org/project/pyfzf-iter/) (`python3 -m pip install pyfzf-iter`) to be installed:
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```python
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from my.ip.all import ips
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from my.core.denylist import DenyList
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d = DenyList("~/data/ip_denylist.json")
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d.deny_cli(ips()) # automatically writes after each selection
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```
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That will open up an interactive `fzf` prompt, where you can select an item to add to the denylist
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This is meant for relatively simple filters, where you want to filter items out
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based on a single attribute of a namedtuple/dataclass. If you want to do something
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more complex, I would recommend overriding the `all.py` file for that source and
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writing your own filter function there.
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For more info on all.py:
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https://github.com/karlicoss/HPI/blob/master/doc/MODULE_DESIGN.org#allpy
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This would typically be used in an overridden `all.py` file, or in a one-off script
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which you may want to filter out some items from a source, progressively adding more
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items to the denylist as you go.
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A potential `my/ip/all.py` file might look like (Sidenote: `discord` module from [here](https://github.com/purarue/HPI)):
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```python
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from typing import Iterator
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from my.ip.common import IP
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from my.core.denylist import DenyList
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deny = DenyList("~/data/ip_denylist.json")
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# all possible data from the source
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def _ips() -> Iterator[IP]:
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from my.ip import discord
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# could add other imports here
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yield from discord.ips()
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# filtered data
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def ips() -> Iterator[IP]:
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yield from deny.filter(_ips())
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```
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To add items to the denylist, you could create a `__main__.py` in your namespace package (in this case, `my/ip/__main__.py`), with contents like:
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```python
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from my.ip import all
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if __name__ == "__main__":
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all.deny.deny_cli(all.ips())
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```
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Which could then be called like: `python3 -m my.ip`
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Or, you could just run it from the command line:
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```
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python3 -c 'from my.ip import all; all.deny.deny_cli(all.ips())'
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```
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To edit the `all.py`, you could either:
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- install it as editable (`python3 -m pip install --user -e ./HPI`), and then edit the file directly
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- or, create a namespace package, which splits the package across multiple directories. For info on that see [`MODULE_DESIGN`](https://github.com/karlicoss/HPI/blob/master/doc/MODULE_DESIGN.org#namespace-packages), [`reorder_editable`](https://github.com/purarue/reorder_editable), and possibly the [`HPI-template`](https://github.com/purarue/HPI-template) to create your own HPI namespace package to create your own `all.py` file.
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For a real example of this see, [purarue/HPI-personal](https://github.com/purarue/HPI-personal/blob/master/my/ip/all.py)
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Sidenote: the reason why we want to specifically override
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the all.py and not just create a script that filters out the items you're
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not interested in is because we want to be able to import from `my.ip.all`
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or `my.location.all` from other modules and get the filtered results, without
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having to mix data filtering logic with parsing/loading/caching (the stuff HPI does)
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