Merge pull request #34 from kwoodson/meta_inventory

Adding a meta inventory to query multiple cloud accounts.

1 files changed, 196 insertions, 0 deletions

diff --git a/inventory/multi_ec2.py b/inventory/multi_ec2.py
new file mode 100755
index 000000000..7fbfb0c90
--- /dev/null
+++ b/inventory/multi_ec2.py
@@ -0,0 +1,196 @@
+#!/usr/bin/env python
+
+from time import time
+import argparse
+import yaml
+import os
+import sys
+import pdb
+import subprocess
+import json
+import pprint
+
+
+class MultiEc2(object):
+
+    def __init__(self):
+        self.config = None
+        self.results = {}
+        self.result = {}
+        self.cache_path_cache = os.path.expanduser('~/.ansible/tmp/multi_ec2_inventory.cache')
+        self.file_path = os.path.join(os.path.dirname(os.path.realpath(__file__)))
+
+        self.parse_cli_args()
+
+        # load yaml
+        self.load_yaml_config()
+
+        # if its a host query, fetch and do not cache
+        if self.args.host:
+            self.get_inventory()
+        elif not self.is_cache_valid():
+            # go fetch the inventories and cache them if cache is expired
+            self.get_inventory()
+            self.write_to_cache()
+        else:
+            # get data from disk
+            self.get_inventory_from_cache()
+
+    def load_yaml_config(self,conf_file=None):
+        """Load a yaml config file with credentials to query the
+        respective cloud for inventory.
+        """
+        config = None
+        if not conf_file:
+            conf_file = os.path.join(self.file_path,'multi_ec2.yaml')
+        with open(conf_file) as conf:
+          self.config = yaml.safe_load(conf)
+
+    def get_provider_tags(self,provider, env={}):
+        """Call <provider> and query all of the tags that are usuable
+        by ansible.  If environment is empty use the default env.
+        """
+        if not env:
+            env = os.environ
+
+        # check to see if provider exists
+        if not os.path.isfile(provider) or not os.access(provider, os.X_OK):
+            raise RuntimeError("Problem with the provider.  Please check path " \
+                        "and that it is executable. (%s)" % provider)
+
+        cmds = [provider]
+        if self.args.host:
+            cmds.append("--host")
+            cmds.append(self.args.host)
+        else:
+            cmds.append('--list')
+
+        cmds.append('--refresh-cache')
+
+        return subprocess.Popen(cmds, stderr=subprocess.PIPE, \
+                                stdout=subprocess.PIPE, env=env)
+    def get_inventory(self):
+        """Create the subprocess to fetch tags from a provider.
+        Host query:
+        Query to return a specific host.  If > 1 queries have
+        results then fail.
+
+        List query:
+        Query all of the different accounts for their tags.  Once completed
+        store all of their results into one merged updated hash.
+        """
+        processes = {}
+        for account in self.config['accounts']:
+            env = account['env_vars']
+            name = account['name']
+            provider = account['provider']
+            processes[name] = self.get_provider_tags(provider, env)
+
+        # for each process collect stdout when its available
+        all_results = []
+        for name, process in processes.items():
+            out, err = process.communicate()
+            all_results.append({
+                "name": name,
+                "out": out.strip(),
+                "err": err.strip(),
+                "code": process.returncode
+            })
+
+        if not self.args.host:
+            # For any non-zero, raise an error on it
+            for result in all_results:
+                if result['code'] != 0:
+                    raise RuntimeError(result['err'])
+                else:
+                    self.results[result['name']] = json.loads(result['out'])
+            values = self.results.values()
+            values.insert(0, self.result)
+            map(lambda x: self.merge_destructively(self.result, x), values)
+        else:
+            # For any 0 result, return it
+            count = 0
+            for results in all_results:
+                if results['code'] == 0 and results['err'] == '' and results['out'] != '{}':
+                    self.result = json.loads(out)
+                    count += 1
+                if count > 1:
+                    raise RuntimeError("Found > 1 results for --host %s. \
+                                       This is an invalid state." % self.args.host)
+    def merge_destructively(self, a, b):
+        "merges b into a"
+        for key in b:
+            if key in a:
+                if isinstance(a[key], dict) and isinstance(b[key], dict):
+                    self.merge_destructively(a[key], b[key])
+                elif a[key] == b[key]:
+                    pass # same leaf value
+                # both lists so add each element in b to a if it does ! exist
+                elif isinstance(a[key], list) and isinstance(b[key],list):
+                    for x in b[key]:
+                        if x not in a[key]:
+                            a[key].append(x)
+                # a is a list and not b
+                elif isinstance(a[key], list):
+                    if b[key] not in a[key]:
+                        a[key].append(b[key])
+                elif isinstance(b[key], list):
+                    a[key] = [a[key]] + [k for k in b[key] if k != a[key]]
+                else:
+                    a[key] = [a[key],b[key]]
+            else:
+                a[key] = b[key]
+        return a
+
+    def is_cache_valid(self):
+        ''' Determines if the cache files have expired, or if it is still valid '''
+
+        if os.path.isfile(self.cache_path_cache):
+            mod_time = os.path.getmtime(self.cache_path_cache)
+            current_time = time()
+            if (mod_time + self.config['cache_max_age']) > current_time:
+                #if os.path.isfile(self.cache_path_index):
+                return True
+
+        return False
+
+    def parse_cli_args(self):
+        ''' Command line argument processing '''
+
+        parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on a provider')
+        parser.add_argument('--list', action='store_true', default=True,
+                           help='List instances (default: True)')
+        parser.add_argument('--host', action='store',
+                           help='Get all the variables about a specific instance')
+        self.args = parser.parse_args()
+
+    def write_to_cache(self):
+        ''' Writes data in JSON format to a file '''
+
+        json_data = self.json_format_dict(self.result, True)
+        with open(self.cache_path_cache, 'w') as cache:
+            cache.write(json_data)
+
+    def get_inventory_from_cache(self):
+        ''' Reads the inventory from the cache file and returns it as a JSON
+        object '''
+
+        with open(self.cache_path_cache, 'r') as cache:
+            self.result = json.loads(cache.read())
+
+    def json_format_dict(self, data, pretty=False):
+        ''' Converts a dict to a JSON object and dumps it as a formatted
+        string '''
+
+        if pretty:
+            return json.dumps(data, sort_keys=True, indent=2)
+        else:
+            return json.dumps(data)
+
+
+if __name__ == "__main__":
+    mi = MultiEc2()
+    #print mi.result
+    pp = pprint.PrettyPrinter(indent=2)
+    pp.pprint(mi.result)
+