forked from hashicorp/terraform
/
resource_address.go
219 lines (193 loc) · 5.21 KB
/
resource_address.go
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
package terraform
import (
"fmt"
"reflect"
"regexp"
"strconv"
"strings"
"github.com/hashicorp/terraform/config"
)
// ResourceAddress is a way of identifying an individual resource (or,
// eventually, a subset of resources) within the state. It is used for Targets.
type ResourceAddress struct {
// Addresses a resource falling somewhere in the module path
// When specified alone, addresses all resources within a module path
Path []string
// Addresses a specific resource that occurs in a list
Index int
InstanceType InstanceType
InstanceTypeSet bool
Name string
Type string
Mode config.ResourceMode // significant only if InstanceTypeSet
}
// Copy returns a copy of this ResourceAddress
func (r *ResourceAddress) Copy() *ResourceAddress {
n := &ResourceAddress{
Path: make([]string, 0, len(r.Path)),
Index: r.Index,
InstanceType: r.InstanceType,
Name: r.Name,
Type: r.Type,
Mode: r.Mode,
}
for _, p := range r.Path {
n.Path = append(n.Path, p)
}
return n
}
// String outputs the address that parses into this address.
func (r *ResourceAddress) String() string {
var result []string
for _, p := range r.Path {
result = append(result, "module", p)
}
switch r.Mode {
case config.ManagedResourceMode:
// nothing to do
case config.DataResourceMode:
result = append(result, "data")
default:
panic(fmt.Errorf("unsupported resource mode %s", r.Mode))
}
if r.Type != "" {
result = append(result, r.Type)
}
if r.Name != "" {
name := r.Name
if r.InstanceTypeSet {
switch r.InstanceType {
case TypePrimary:
name += ".primary"
case TypeDeposed:
name += ".deposed"
case TypeTainted:
name += ".tainted"
}
}
if r.Index >= 0 {
name += fmt.Sprintf("[%d]", r.Index)
}
result = append(result, name)
}
return strings.Join(result, ".")
}
func ParseResourceAddress(s string) (*ResourceAddress, error) {
matches, err := tokenizeResourceAddress(s)
if err != nil {
return nil, err
}
mode := config.ManagedResourceMode
if matches["data_prefix"] != "" {
mode = config.DataResourceMode
}
resourceIndex, err := ParseResourceIndex(matches["index"])
if err != nil {
return nil, err
}
instanceType, err := ParseInstanceType(matches["instance_type"])
if err != nil {
return nil, err
}
path := ParseResourcePath(matches["path"])
// not allowed to say "data." without a type following
if mode == config.DataResourceMode && matches["type"] == "" {
return nil, fmt.Errorf("must target specific data instance")
}
return &ResourceAddress{
Path: path,
Index: resourceIndex,
InstanceType: instanceType,
InstanceTypeSet: matches["instance_type"] != "",
Name: matches["name"],
Type: matches["type"],
Mode: mode,
}, nil
}
func (addr *ResourceAddress) Equals(raw interface{}) bool {
other, ok := raw.(*ResourceAddress)
if !ok {
return false
}
pathMatch := len(addr.Path) == 0 && len(other.Path) == 0 ||
reflect.DeepEqual(addr.Path, other.Path)
indexMatch := addr.Index == -1 ||
other.Index == -1 ||
addr.Index == other.Index
nameMatch := addr.Name == "" ||
other.Name == "" ||
addr.Name == other.Name
typeMatch := addr.Type == "" ||
other.Type == "" ||
addr.Type == other.Type
// mode is significant only when type is set
modeMatch := addr.Type == "" ||
other.Type == "" ||
addr.Mode == other.Mode
return pathMatch &&
indexMatch &&
addr.InstanceType == other.InstanceType &&
nameMatch &&
typeMatch &&
modeMatch
}
func ParseResourceIndex(s string) (int, error) {
if s == "" {
return -1, nil
}
return strconv.Atoi(s)
}
func ParseResourcePath(s string) []string {
if s == "" {
return nil
}
parts := strings.Split(s, ".")
path := make([]string, 0, len(parts))
for _, s := range parts {
// Due to the limitations of the regexp match below, the path match has
// some noise in it we have to filter out :|
if s == "" || s == "module" {
continue
}
path = append(path, s)
}
return path
}
func ParseInstanceType(s string) (InstanceType, error) {
switch s {
case "", "primary":
return TypePrimary, nil
case "deposed":
return TypeDeposed, nil
case "tainted":
return TypeTainted, nil
default:
return TypeInvalid, fmt.Errorf("Unexpected value for InstanceType field: %q", s)
}
}
func tokenizeResourceAddress(s string) (map[string]string, error) {
// Example of portions of the regexp below using the
// string "aws_instance.web.tainted[1]"
re := regexp.MustCompile(`\A` +
// "module.foo.module.bar" (optional)
`(?P<path>(?:module\.[^.]+\.?)*)` +
// possibly "data.", if targeting is a data resource
`(?P<data_prefix>(?:data\.)?)` +
// "aws_instance.web" (optional when module path specified)
`(?:(?P<type>[^.]+)\.(?P<name>[^.[]+))?` +
// "tainted" (optional, omission implies: "primary")
`(?:\.(?P<instance_type>\w+))?` +
// "1" (optional, omission implies: "0")
`(?:\[(?P<index>\d+)\])?` +
`\z`)
groupNames := re.SubexpNames()
rawMatches := re.FindAllStringSubmatch(s, -1)
if len(rawMatches) != 1 {
return nil, fmt.Errorf("Problem parsing address: %q", s)
}
matches := make(map[string]string)
for i, m := range rawMatches[0] {
matches[groupNames[i]] = m
}
return matches, nil
}