summaryrefslogtreecommitdiffstats
path: root/tripleo_heat_merge/merge.py
blob: 053a683aae6ef1d90eb26ffc3c68fd9e3436809b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
import os
import sys
import yaml
import argparse


def _translate_role(role, master_role, slave_roles):
    if not master_role:
        return role
    if role == master_role:
        return role
    if role not in slave_roles:
        return role
    return master_role

def translate_role(role, master_role, slave_roles):
    r = _translate_role(role, master_role, slave_roles)
    if not isinstance(r, basestring):
        raise Exception('%s -> %r' % (role, r))
    return r

def resolve_params(item, param, value):
    if item == {'Ref': param}:
        return value
    if isinstance(item, dict):
        copy_item = dict(item)
        for k, v in iter(copy_item.items()):
            item[k] = resolve_params(v, param, value)
    elif isinstance(item, list):
        copy_item = list(item)
        new_item = []
        for v in copy_item:
            new_item.append(resolve_params(v, param, value))
        item = new_item
    return item

MERGABLE_TYPES = {'OS::Nova::Server':
                  {'image': 'image'},
                  'AWS::EC2::Instance':
                  {'image': 'ImageId'},
                  'AWS::AutoScaling::LaunchConfiguration':
                  {},
                 }
INCLUDED_TEMPLATE_DIR = os.getcwd()


def resolve_includes(template, params=None):
    new_template = {}
    if params is None:
        params = {}
    for key, value in iter(template.items()):
        if key == '__include__':
            new_params = dict(params) # do not propagate up the stack
            if not isinstance(value, dict):
                raise ValueError('__include__ must be a mapping')
            if 'path' not in value:
                raise ValueError('__include__ must have path')
            if 'params' in value:
                if not isinstance(value['params'], dict):
                    raise ValueError('__include__ params must be a mapping')
                new_params.update(value['params'])
            with open(value['path']) as include_file:
                sub_template = yaml.safe_load(include_file.read())
                if 'subkey' in value:
                    if ((not isinstance(value['subkey'], int)
                         and not isinstance(sub_template, dict))):
                        raise RuntimeError('subkey requires mapping root or'
                                           ' integer for list root')
                    sub_template = sub_template[value['subkey']]
                for k, v in iter(new_params.items()):
                    sub_template = resolve_params(sub_template, k, v)
                new_template.update(resolve_includes(sub_template))
        else:
            if isinstance(value, dict):
                new_template[key] = resolve_includes(value)
            else:
                new_template[key] = value
    return new_template

def main(argv=None):
    if argv is None:
        argv = sys.argv[1:]
    parser = argparse.ArgumentParser()
    parser.add_argument('templates', nargs='+')
    parser.add_argument('--master-role', nargs='?',
                        help='Translate slave_roles to this')
    parser.add_argument('--slave-roles', nargs='*',
                        help='Translate all of these to master_role')
    parser.add_argument('--included-template-dir', nargs='?',
                        default=INCLUDED_TEMPLATE_DIR,
                        help='Path for resolving included templates')
    args = parser.parse_args(argv)
    templates = args.templates
    merged_template = merge(templates, args.master_role, args.slave_roles,
                            args.included_template_dir)
    sys.stdout.write(merged_template)

def merge(templates, master_role=None, slave_roles=None,
          included_template_dir=INCLUDED_TEMPLATE_DIR):
    errors = []
    end_template={'HeatTemplateFormatVersion': '2012-12-12',
                  'Description': []}
    resource_changes=[]
    for template_path in templates:
        template = yaml.safe_load(open(template_path))
        # Resolve __include__ tags
        template = resolve_includes(template)
        end_template['Description'].append(template.get('Description',
                                                        template_path))
        new_parameters = template.get('Parameters', {})
        for p, pbody in sorted(new_parameters.items()):
            if p in end_template.get('Parameters', {}):
                if pbody != end_template['Parameters'][p]:
                    errors.append('Parameter %s from %s conflicts.' % (p,
                                                                       template_path))
                continue
            if 'Parameters' not in end_template:
                end_template['Parameters'] = {}
            end_template['Parameters'][p] = pbody

        new_outputs = template.get('Outputs', {})
        for o, obody in sorted(new_outputs.items()):
            if o in end_template.get('Outputs', {}):
                if pbody != end_template['Outputs'][p]:
                    errors.append('Output %s from %s conflicts.' % (o,
                                                                       template_path))
                continue
            if 'Outputs' not in end_template:
                end_template['Outputs'] = {}
            end_template['Outputs'][o] = obody

        new_resources = template.get('Resources', {})
        for r, rbody in sorted(new_resources.items()):
            if rbody['Type'] in MERGABLE_TYPES:
                if 'image' in MERGABLE_TYPES[rbody['Type']]:
                    image_key = MERGABLE_TYPES[rbody['Type']]['image']
                    # XXX Assuming ImageId is always a Ref
                    ikey_val = end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
                    del end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
                role = rbody.get('Metadata', {}).get('OpenStack::Role', r)
                role = translate_role(role, master_role, slave_roles)
                if role != r:
                    resource_changes.append((r, role))
                if role in end_template.get('Resources', {}):
                    new_metadata = rbody.get('Metadata', {})
                    for m, mbody in iter(new_metadata.items()):
                        if m in end_template['Resources'][role].get('Metadata', {}):
                            if m == 'OpenStack::ImageBuilder::Elements':
                                end_template['Resources'][role]['Metadata'][m].extend(mbody)
                                continue
                            if mbody != end_template['Resources'][role]['Metadata'][m]:
                                errors.append('Role %s metadata key %s conflicts.' %
                                              (role, m))
                            continue
                        end_template['Resources'][role]['Metadata'][m] = mbody
                    continue
                if 'Resources' not in end_template:
                    end_template['Resources'] = {}
                end_template['Resources'][role] = rbody
                if 'image' in MERGABLE_TYPES[rbody['Type']]:
                    ikey = '%sImage' % (role)
                    end_template['Resources'][role]['Properties'][image_key] = {'Ref': ikey}
                    end_template['Parameters'][ikey] = ikey_val
            elif rbody['Type'] == 'FileInclude':
                # we trust os.path.join to DTRT: if FileInclude path isn't
                # absolute, join to included_template_dir (./)
                with open(os.path.join(included_template_dir, rbody['Path'])) as rfile:
                    include_content = yaml.safe_load(rfile.read())
                    subkeys = rbody.get('SubKey','').split('.')
                    while len(subkeys) and subkeys[0]:
                        include_content = include_content[subkeys.pop(0)]
                    for replace_param, replace_value in iter(rbody.get('Parameters',
                                                                       {}).items()):
                        include_content = resolve_params(include_content,
                                                         replace_param,
                                                         replace_value)
                    end_template['Resources'][r] = include_content
            else:
                if r in end_template.get('Resources', {}):
                    if rbody != end_template['Resources'][r]:
                        errors.append('Resource %s from %s conflicts' % (r,
                                                                         template_path))
                    continue
                if 'Resources' not in end_template:
                    end_template['Resources'] = {}
                end_template['Resources'][r] = rbody

    def fix_ref(item, old, new):
        if isinstance(item, dict):
            copy_item = dict(item)
            for k, v in sorted(copy_item.items()):
                if k == 'Ref' and v == old:
                    item[k] = new
                    continue
                if k == 'DependsOn' and v == old:
                    item[k] = new
                    continue
                if k == 'Fn::GetAtt' and isinstance(v, list) and v[0] == old:
                    new_list = list(v)
                    new_list[0] = new
                    item[k] = new_list
                    continue
                if k == 'AllowedResources' and isinstance(v, list) and old in v:
                    while old in v:
                        pos = v.index(old)
                        v[pos] = new
                    continue
                fix_ref(v, old, new)
        elif isinstance(item, list):
            copy_item = list(item)
            for v in item:
                fix_ref(v, old, new)

    for change in resource_changes:
        fix_ref(end_template, change[0], change[1])

    if errors:
        for e in errors:
            sys.stderr.write("ERROR: %s\n" % e)
    end_template['Description'] = ','.join(end_template['Description'])
    return yaml.safe_dump(end_template, default_flow_style=False)

if __name__ == "__main__":
      main()