Metadata-Version: 2.1
Name: somutils
Version: 1.8.2
Summary: Tools we use at Somenergia and can be useful
Home-page: https://github.com/Som-Energia/somenergia-utils
Author: César López Ramírez
Author-email: cesar.lopez@somenergia.coop
License: GNU General Public License v3 or later (GPLv3+)
Platform: UNKNOWN
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Environment :: Console
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Intended Audience :: Developers
Classifier: Development Status :: 5 - Production/Stable
Classifier: License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)
Classifier: Operating System :: OS Independent
Description-Content-Type: text/markdown

# somenergia-utils

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This module includes different Python modules and scripts
ubiquiously used on scripts in SomEnergia cooperative
but with no entity by themselves to have their own repository.


- `venv`: script to run a command under a Python virtual enviroment
- `sql2csv.py`: script to run parametrized sql queries and get the result as (tab separated) csv.
- `tsv`: module for quick TSV serialization (csv with tabs as separators) of yamlns.namespace and dict like objects
	- `tsvread`: provides TSV rows as yamlns.namespaces (dict specialization)
	- `tsvwrite`: writes a TSV from a sequence of dicts
- `dbutils.py`: module with db related functions
	- `runsql`: runs a file with a sql and returns the objects as yamlns namespaces
	- `runsql_cached`: like runsql but cache the results in a tsv file to avoid second runs
	- `fetchNs`: a generator that wraps db cursors to fetch objects with attributes instead of psycopg arrays
	- `nsList`: uses the former to build a list of such object (slower but maybe convinient)
	- `csvTable`: turns the results of a query into a tab separated table with proper header names
- `isodates`: String to time/date/datetime objects with naive/timezoned handling
- `sheetfetcher.py`: convenience class to retrieve data from gdrive spreadshets
- `trace`: quickly enable and disable tracing function calling by decorating them with `@trace`
- `testutils`: module with common test utilities
	- `testutils.destructiveTest`: decorator to avoid running destructive tests in production
	- `testutils.temp_path`: context manager that provides a selfdestructing temporary directory for tests
	- `testutils.working_dir`: context manager that changes the current working directory and restores it afterwards
	- `testutils.sandbox_dir`: context manager that combines `temp_path` and `working_dir`
- `erptree`: extracts an object and its children from the erp (erppeek, odoo)
	with controlled recursion

## `venv` script

Simplifies running a Python script under a given virtual environtment.
This is specially useful to run Python scripts from crontab lines.

```bash
usage: venv /PATH/TO/PYTHON/VIRTUALENV COMMAND [PARAM1 [PARAM2...]]
```

## `sql2csv.py` script

Runs an SQL file and outputs the result of the query as tabulator separated csv.a

A local `config.py` file is required, or you should provide it as `-C file.py`
It should contain a dict named `pyscopg` with the keyword parameters to
[psycopg2.connect](https://www.psycopg.org/docs/module.html#psycopg2.connect).

You can provide query parameters either as yamlfile or as commandline options.

```bash
 sql2csv.py <sqlfile> [<yamlfile>] [--<var1> <value1> [--<var2> <value2> ..] ]
```

## `dbutils` Python module

### Convenient database access

Having a query in a file.

```python
params = dict(
   param1='value',
   param2=[1,3,4,5], # Useful for the IN clause
)
for item in runsql('myquery.sql', **params):
   print(item.id, item.description) # id and description should be columns in the query
```

Like `sql2csv` there must exist a config.py file or provide it with the `config` keyword parameter

Parameters are inserted as specified in [psycopg2 documentation](https://www.psycopg.org/docs/usage.html#query-parameters)

TODO: db and cursor parameters to reuse existing ones.

If you know the results will be always the same, you can use `runsql_cache` instead.
It will generate a tsv file name like the sql file with the results,
and will use it instead of the query for next executions.

The usage of `runsql_cache` is quite similar to `runsql` to be exchangeable.
`runsql_cache` just adds a couple of keyword arguments.

- `cachefile`: to override the default cache file (a name, a path or a file like object)
- `force`: to force the query execution even if the cache exists

### Cursor wrappers

Convenient cursor wrappers to make the database access code more readable.

Example:

```python
import psycopg2, dbutils
db = psycopg2.connect(**dbconfiguration)
with db.cursor() as cursor :
	cursor.execute("SELECT name, age FROM people")
	for person as dbutils.fetchNs(cursor):
		if person.age < 21: continue
		print("{name} is {age} years old".format(person))
```

## `sheetfetcher` Python module

Convenient wraper for gdrive.

```python
from sheetfetcher import SheetFetcher

fetcher = SheetFetcher(
	documentName='My Document',
	credentialFilename='drive-certificate.json',
	)
table = fetcher.get_range("My Sheet", "A2:F12")
fulltable = fetcher.get_fullsheet("My Sheet")
```

- Document selectors can be either an uri or the title
- Sheet selectors can be either an index, a name or an id.
- Range selectors can be either a named range, index tuple or a "A2:F5" coordinates.
- You should [Create a certificate and grant it access to the document](http://gspread.readthedocs.org/en/latest/oauth2.html)

## trace

This decorator is a fast helper to trace calls to functions and methods.
It will show the name of the functions the values of the parameters and the returned values.

```python
from trace import trace

@trace
def factorial(n):
    if n<1: return 1
    return n*factorial(n-1)

factorial(6)

('> factorial', (6,))
('> factorial', (5,))
('> factorial', (4,))
('> factorial', (3,))
('> factorial', (2,))
('> factorial', (1,))
('> factorial', (0,))
('< factorial', (0,), '->', 1)
('< factorial', (1,), '->', 1)
('< factorial', (2,), '->', 2)
('< factorial', (3,), '->', 6)
('< factorial', (4,), '->', 24)
('< factorial', (5,), '->', 120)
('< factorial', (6,), '->', 720)

```

## `testutils.assertNsEqual`

Allows to assert equality on json/yaml like structures combining
dicts, lists, numbers, strings, dates...
The comparision is done on the YAML output so that differences are
spoted as text diffs.
Also keys in dicts are alphabetically sorted.


## `testutils.destructiveTest`

An utility to avoid running destrutive tests in production.
It is a decorator that checks wheter the erp configured in `dbconfig`
has the testing flag and skips the test if it doesn't.

The script `enable_destructive_test.py` is also provided to set/unset
that testing flag which is not defined by default.

## `isodates`

Module for simplified isodate parsing and timezone handling.


## `sequence`

Interprets strings like the ones the standard Print Dialog
uses to specify pages to be printed.
ie. "2,4,6-9,13" means "2, 4, from 6 to 9 and 13"

## `erptree`

Creates an structure from ERP objects that you can navigate
or dump as yaml.
You can select fields to expand, taking just the name or the id,
anonymize or removing.
You can use dot notation to specify fields in related objects.
For multiple relations, a subfield refers to the subfield in
all related objects.


```python
from somutils.erptree import erptree

O = Client(....)

partner = erptree(partnerAddress_id, O.ResPartnerAddress,
	expand = {
		'partner_id': O.ResPartner,
		'partner_id.company': O.ResPartner,
	},
	pickName = [
		'partner_id.state_id',
		'partner_id.country_id',
	],
	anonymize = [
		'email',
	],
	remove = [
		'superfluous_field',
	],
)
	
```









