New Filter plugin from_csv (#2037)

* Added from_csv filter and integration tests

* Cleaning up whitespace

* Adding changelog fragment

* Updated changelog fragment name

* Removed temp fragment

* Refactoring csv functions Part 1

* Syncing refactored csv modules/filters

* Adding unit tests for csv Module_Util

* Updating changelog fragment

* Correcting whitespace in unit test

* Improving changelog fragment

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update changelogs/fragments/2037-add-from-csv-filter.yml

Co-authored-by: Felix Fontein <felix@fontein.de>

changelogs/fragments/2037-add-from-csv-filter.yml

@@ -0,0 +1,7 @@
+---
+add plugin.filter:
+  - name: from_csv
+    description: Converts CSV text input into list of dicts
+minor_changes:
+  - csv module utils - new module_utils for shared functions between ``from_csv`` filter and ``read_csv`` module (https://github.com/ansible-collections/community.general/pull/2037).
+  - read_csv - refactored read_csv module to use shared csv functions from csv module_utils (https://github.com/ansible-collections/community.general/pull/2037).

plugins/filter/from_csv.py

@@ -0,0 +1,49 @@
+# -*- coding: utf-8 -*-
+
+# Copyright: (c) 2021, Andrew Pantuso (@ajpantuso) <ajpantuso@gmail.com>
+# Copyright: (c) 2018, Dag Wieers (@dagwieers) <dag@wieers.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+from ansible.errors import AnsibleFilterError
+from ansible.module_utils._text import to_native
+
+from ansible_collections.community.general.plugins.module_utils.csv import (initialize_dialect, read_csv, CSVError,
+                                                                            DialectNotAvailableError,
+                                                                            CustomDialectFailureError)
+
+
+def from_csv(data, dialect='excel', fieldnames=None, delimiter=None, skipinitialspace=None, strict=None):
+
+    dialect_params = {
+        "delimiter": delimiter,
+        "skipinitialspace": skipinitialspace,
+        "strict": strict,
+    }
+
+    try:
+        dialect = initialize_dialect(dialect, **dialect_params)
+    except (CustomDialectFailureError, DialectNotAvailableError) as e:
+        raise AnsibleFilterError(to_native(e))
+
+    reader = read_csv(data, dialect, fieldnames)
+
+    data_list = []
+
+    try:
+        for row in reader:
+            data_list.append(row)
+    except CSVError as e:
+        raise AnsibleFilterError("Unable to process file: %s" % to_native(e))
+
+    return data_list
+
+
+class FilterModule(object):
+
+    def filters(self):
+        return {
+            'from_csv': from_csv
+        }

plugins/module_utils/csv.py

@@ -0,0 +1,67 @@
+# -*- coding: utf-8 -*-
+
+# Copyright: (c) 2021, Andrew Pantuso (@ajpantuso) <ajpantuso@gmail.com>
+# Copyright: (c) 2018, Dag Wieers (@dagwieers) <dag@wieers.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+import csv
+from io import BytesIO, StringIO
+
+from ansible.module_utils._text import to_native
+from ansible.module_utils.six import PY3
+
+
+class CustomDialectFailureError(Exception):
+    pass
+
+
+class DialectNotAvailableError(Exception):
+    pass
+
+
+CSVError = csv.Error
+
+
+def initialize_dialect(dialect, **kwargs):
+    # Add Unix dialect from Python 3
+    class unix_dialect(csv.Dialect):
+        """Describe the usual properties of Unix-generated CSV files."""
+        delimiter = ','
+        quotechar = '"'
+        doublequote = True
+        skipinitialspace = False
+        lineterminator = '\n'
+        quoting = csv.QUOTE_ALL
+
+    csv.register_dialect("unix", unix_dialect)
+
+    if dialect not in csv.list_dialects():
+        raise DialectNotAvailableError("Dialect '%s' is not supported by your version of python." % dialect)
+
+    # Create a dictionary from only set options
+    dialect_params = dict((k, v) for k, v in kwargs.items() if v is not None)
+    if dialect_params:
+        try:
+            csv.register_dialect('custom', dialect, **dialect_params)
+        except TypeError as e:
+            raise CustomDialectFailureError("Unable to create custom dialect: %s" % to_native(e))
+        dialect = 'custom'
+
+    return dialect
+
+
+def read_csv(data, dialect, fieldnames=None):
+
+    data = to_native(data, errors='surrogate_or_strict')
+
+    if PY3:
+        fake_fh = StringIO(data)
+    else:
+        fake_fh = BytesIO(data)
+
+    reader = csv.DictReader(fake_fh, fieldnames=fieldnames, dialect=dialect)
+
+    return reader

plugins/modules/files/read_csv.py

@@ -137,26 +137,12 @@
     gid: 500
 '''
 
-import csv
-from io import BytesIO, StringIO
-
 from ansible.module_utils.basic import AnsibleModule
-from ansible.module_utils._text import to_text
-from ansible.module_utils.six import PY3
-
-
-# Add Unix dialect from Python 3
-class unix_dialect(csv.Dialect):
-    """Describe the usual properties of Unix-generated CSV files."""
-    delimiter = ','
-    quotechar = '"'
-    doublequote = True
-    skipinitialspace = False
-    lineterminator = '\n'
-    quoting = csv.QUOTE_ALL
+from ansible.module_utils._text import to_native
 
-
-csv.register_dialect("unix", unix_dialect)
+from ansible_collections.community.general.plugins.module_utils.csv import (initialize_dialect, read_csv, CSVError,
+                                                                            DialectNotAvailableError,
+                                                                            CustomDialectFailureError)
 
 
 def main():
@@ -180,38 +166,24 @@ def main():
     fieldnames = module.params['fieldnames']
     unique = module.params['unique']
 
-    if dialect not in csv.list_dialects():
-        module.fail_json(msg="Dialect '%s' is not supported by your version of python." % dialect)
-
-    dialect_options = dict(
-        delimiter=module.params['delimiter'],
-        skipinitialspace=module.params['skipinitialspace'],
-        strict=module.params['strict'],
-    )
+    dialect_params = {
+        "delimiter": module.params['delimiter'],
+        "skipinitialspace": module.params['skipinitialspace'],
+        "strict": module.params['strict'],
+    }
 
-    # Create a dictionary from only set options
-    dialect_params = dict((k, v) for k, v in dialect_options.items() if v is not None)
-    if dialect_params:
-        try:
-            csv.register_dialect('custom', dialect, **dialect_params)
-        except TypeError as e:
-            module.fail_json(msg="Unable to create custom dialect: %s" % to_text(e))
-        dialect = 'custom'
+    try:
+        dialect = initialize_dialect(dialect, **dialect_params)
+    except (CustomDialectFailureError, DialectNotAvailableError) as e:
+        module.fail_json(msg=to_native(e))
 
     try:
         with open(path, 'rb') as f:
             data = f.read()
     except (IOError, OSError) as e:
-        module.fail_json(msg="Unable to open file: %s" % to_text(e))
-
-    if PY3:
-        # Manually decode on Python3 so that we can use the surrogateescape error handler
-        data = to_text(data, errors='surrogate_or_strict')
-        fake_fh = StringIO(data)
-    else:
-        fake_fh = BytesIO(data)
+        module.fail_json(msg="Unable to open file: %s" % to_native(e))
 
-    reader = csv.DictReader(fake_fh, fieldnames=fieldnames, dialect=dialect)
+    reader = read_csv(data, dialect, fieldnames)
 
     if key and key not in reader.fieldnames:
         module.fail_json(msg="Key '%s' was not found in the CSV header fields: %s" % (key, ', '.join(reader.fieldnames)))
@@ -223,16 +195,16 @@ def main():
         try:
             for row in reader:
                 data_list.append(row)
-        except csv.Error as e:
-            module.fail_json(msg="Unable to process file: %s" % to_text(e))
+        except CSVError as e:
+            module.fail_json(msg="Unable to process file: %s" % to_native(e))
     else:
         try:
             for row in reader:
                 if unique and row[key] in data_dict:
                     module.fail_json(msg="Key '%s' is not unique for value '%s'" % (key, row[key]))
                 data_dict[row[key]] = row
-        except csv.Error as e:
-            module.fail_json(msg="Unable to process file: %s" % to_text(e))
+        except CSVError as e:
+            module.fail_json(msg="Unable to process file: %s" % to_native(e))
 
     module.exit_json(dict=data_dict, list=data_list)
 

tests/integration/targets/filter_from_csv/aliases

@@ -0,0 +1,2 @@
+shippable/posix/group2
+skip/python2.6  # filters are controller only, and we no longer support Python 2.6 on the controller

tests/integration/targets/filter_from_csv/tasks/main.yml

@@ -0,0 +1,49 @@
+####################################################################
+# WARNING: These are designed specifically for Ansible tests       #
+# and should not be used as examples of how to write Ansible roles #
+####################################################################
+
+- name: Parse valid csv input
+  assert:
+    that:
+      - "valid_comma_separated | community.general.from_csv  ==  expected_result"
+
+- name: Parse valid csv input containing spaces with/without skipinitialspace=True
+  assert:
+    that:
+      - "valid_comma_separated_spaces | community.general.from_csv(skipinitialspace=True)  ==  expected_result"
+      - "valid_comma_separated_spaces | community.general.from_csv  !=  expected_result"
+
+- name: Parse valid csv input with no headers with/without specifiying fieldnames
+  assert:
+    that:
+      - "valid_comma_separated_no_headers | community.general.from_csv(fieldnames=['id','name','role'])  ==  expected_result"
+      - "valid_comma_separated_no_headers | community.general.from_csv  !=  expected_result"
+
+- name: Parse valid pipe-delimited csv input with/without delimiter=|
+  assert:
+    that:
+      - "valid_pipe_separated | community.general.from_csv(delimiter='|')  ==  expected_result"
+      - "valid_pipe_separated | community.general.from_csv  !=  expected_result"
+
+- name: Register result of invalid csv input when strict=False
+  debug:
+    var: "invalid_comma_separated | community.general.from_csv"
+  register: _invalid_csv_strict_false
+
+- name: Test invalid csv input when strict=False is successful
+  assert:
+    that:
+      - _invalid_csv_strict_false is success
+
+- name: Register result of invalid csv input when strict=True
+  debug:
+    var: "invalid_comma_separated | community.general.from_csv(strict=True)"
+  register: _invalid_csv_strict_true
+  ignore_errors: True
+
+- name: Test invalid csv input when strict=True is failed
+  assert:
+    that:
+      - _invalid_csv_strict_true is failed
+      - _invalid_csv_strict_true.msg is match('Unable to process file:.*')

tests/integration/targets/filter_from_csv/vars/main.yml

@@ -0,0 +1,26 @@
+valid_comma_separated: |
+  id,name,role
+  1,foo,bar
+  2,bar,baz
+valid_comma_separated_spaces: |
+  id,name,role
+  1, foo, bar
+  2, bar, baz
+valid_comma_separated_no_headers: |
+  1,foo,bar
+  2,bar,baz
+valid_pipe_separated: |
+  id|name|role
+  1|foo|bar
+  2|bar|baz
+invalid_comma_separated: |
+  id,name,role
+  1,foo,bar
+  2,"b"ar",baz
+expected_result:
+  - id: '1'
+    name: foo
+    role: bar
+  - id: '2'
+    name: bar
+    role: baz