Merge pull request #341 from detiber/sdodson-etcd-playbook

External clustered etcd support

1 files changed, 215 insertions, 0 deletions

diff --git a/lookup_plugins/sequence.py b/lookup_plugins/sequence.py
new file mode 100644
index 000000000..8ca9e7b39
--- /dev/null
+++ b/lookup_plugins/sequence.py
@@ -0,0 +1,215 @@
+# (c) 2013, Jayson Vantuyl <jayson@aggressive.ly>
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+from ansible.errors import AnsibleError
+import ansible.utils as utils
+from re import compile as re_compile, IGNORECASE
+
+# shortcut format
+NUM = "(0?x?[0-9a-f]+)"
+SHORTCUT = re_compile(
+    "^(" +        # Group 0
+    NUM +         # Group 1: Start
+    "-)?" +
+    NUM +         # Group 2: End
+    "(/" +        # Group 3
+    NUM +         # Group 4: Stride
+    ")?" +
+    "(:(.+))?$",  # Group 5, Group 6: Format String
+    IGNORECASE
+)
+
+
+class LookupModule(object):
+    """
+    sequence lookup module
+
+    Used to generate some sequence of items. Takes arguments in two forms.
+
+    The simple / shortcut form is:
+
+      [start-]end[/stride][:format]
+
+    As indicated by the brackets: start, stride, and format string are all
+    optional.  The format string is in the style of printf.  This can be used
+    to pad with zeros, format in hexadecimal, etc.  All of the numerical values
+    can be specified in octal (i.e. 0664) or hexadecimal (i.e. 0x3f8).
+    Negative numbers are not supported.
+
+    Some examples:
+
+      5 -> ["1","2","3","4","5"]
+      5-8 -> ["5", "6", "7", "8"]
+      2-10/2 -> ["2", "4", "6", "8", "10"]
+      4:host%02d -> ["host01","host02","host03","host04"]
+
+    The standard Ansible key-value form is accepted as well.  For example:
+
+      start=5 end=11 stride=2 format=0x%02x -> ["0x05","0x07","0x09","0x0a"]
+
+    This format takes an alternate form of "end" called "count", which counts
+    some number from the starting value.  For example:
+
+      count=5 -> ["1", "2", "3", "4", "5"]
+      start=0x0f00 count=4 format=%04x -> ["0f00", "0f01", "0f02", "0f03"]
+      start=0 count=5 stride=2 -> ["0", "2", "4", "6", "8"]
+      start=1 count=5 stride=2 -> ["1", "3", "5", "7", "9"]
+
+    The count option is mostly useful for avoiding off-by-one errors and errors
+    calculating the number of entries in a sequence when a stride is specified.
+    """
+
+    def __init__(self, basedir, **kwargs):
+        """absorb any keyword args"""
+        self.basedir = basedir
+
+    def reset(self):
+        """set sensible defaults"""
+        self.start = 1
+        self.count = None
+        self.end = None
+        self.stride = 1
+        self.format = "%d"
+
+    def parse_kv_args(self, args):
+        """parse key-value style arguments"""
+        for arg in ["start", "end", "count", "stride"]:
+            try:
+                arg_raw = args.pop(arg, None)
+                if arg_raw is None:
+                    continue
+                arg_cooked = int(arg_raw, 0)
+                setattr(self, arg, arg_cooked)
+            except ValueError:
+                raise AnsibleError(
+                    "can't parse arg %s=%r as integer"
+                        % (arg, arg_raw)
+                )
+            if 'format' in args:
+                self.format = args.pop("format")
+        if args:
+            raise AnsibleError(
+                "unrecognized arguments to with_sequence: %r"
+                % args.keys()
+            )
+
+    def parse_simple_args(self, term):
+        """parse the shortcut forms, return True/False"""
+        match = SHORTCUT.match(term)
+        if not match:
+            return False
+
+        _, start, end, _, stride, _, format = match.groups()
+
+        if start is not None:
+            try:
+                start = int(start, 0)
+            except ValueError:
+                raise AnsibleError("can't parse start=%s as integer" % start)
+        if end is not None:
+            try:
+                end = int(end, 0)
+            except ValueError:
+                raise AnsibleError("can't parse end=%s as integer" % end)
+        if stride is not None:
+            try:
+                stride = int(stride, 0)
+            except ValueError:
+                raise AnsibleError("can't parse stride=%s as integer" % stride)
+
+        if start is not None:
+            self.start = start
+        if end is not None:
+            self.end = end
+        if stride is not None:
+            self.stride = stride
+        if format is not None:
+            self.format = format
+
+    def sanity_check(self):
+        if self.count is None and self.end is None:
+            raise AnsibleError(
+                "must specify count or end in with_sequence"
+            )
+        elif self.count is not None and self.end is not None:
+            raise AnsibleError(
+                "can't specify both count and end in with_sequence"
+            )
+        elif self.count is not None:
+            # convert count to end
+            if self.count != 0:
+                self.end = self.start + self.count * self.stride - 1
+            else:
+                self.start = 0
+                self.end = 0
+                self.stride = 0
+            del self.count
+        if self.stride > 0 and self.end < self.start:
+            raise AnsibleError("to count backwards make stride negative")
+        if self.stride < 0 and self.end > self.start:
+            raise AnsibleError("to count forward don't make stride negative")
+        if self.format.count('%') != 1:
+            raise AnsibleError("bad formatting string: %s" % self.format)
+
+    def generate_sequence(self):
+        if self.stride > 0:
+            adjust = 1
+        else:
+            adjust = -1
+        numbers = xrange(self.start, self.end + adjust, self.stride)
+
+        for i in numbers:
+            try:
+                formatted = self.format % i
+                yield formatted
+            except (ValueError, TypeError):
+                raise AnsibleError(
+                    "problem formatting %r with %r" % self.format
+                )
+
+    def run(self, terms, inject=None, **kwargs):
+        results = []
+
+        terms = utils.listify_lookup_plugin_terms(terms, self.basedir, inject)
+
+        if isinstance(terms, basestring):
+            terms = [ terms ]
+
+        for term in terms:
+            try:
+                self.reset()  # clear out things for this iteration
+
+                try:
+                    if not self.parse_simple_args(term):
+                        self.parse_kv_args(utils.parse_kv(term))
+                except Exception:
+                    raise AnsibleError(
+                        "unknown error parsing with_sequence arguments: %r"
+                        % term
+                    )
+
+                self.sanity_check()
+                if self.stride != 0:
+                    results.extend(self.generate_sequence())
+            except AnsibleError:
+                raise
+            except Exception, e:
+                raise AnsibleError(
+                    "unknown error generating sequence: %s" % str(e)
+                )
+
+        return results