diff options
Diffstat (limited to 'vendor/github.com/hashicorp/terraform/helper/schema/field_reader_multi.go')
-rw-r--r-- | vendor/github.com/hashicorp/terraform/helper/schema/field_reader_multi.go | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/vendor/github.com/hashicorp/terraform/helper/schema/field_reader_multi.go b/vendor/github.com/hashicorp/terraform/helper/schema/field_reader_multi.go new file mode 100644 index 0000000..89ad3a8 --- /dev/null +++ b/vendor/github.com/hashicorp/terraform/helper/schema/field_reader_multi.go | |||
@@ -0,0 +1,63 @@ | |||
1 | package schema | ||
2 | |||
3 | import ( | ||
4 | "fmt" | ||
5 | ) | ||
6 | |||
7 | // MultiLevelFieldReader reads from other field readers, | ||
8 | // merging their results along the way in a specific order. You can specify | ||
9 | // "levels" and name them in order to read only an exact level or up to | ||
10 | // a specific level. | ||
11 | // | ||
12 | // This is useful for saying things such as "read the field from the state | ||
13 | // and config and merge them" or "read the latest value of the field". | ||
14 | type MultiLevelFieldReader struct { | ||
15 | Readers map[string]FieldReader | ||
16 | Levels []string | ||
17 | } | ||
18 | |||
19 | func (r *MultiLevelFieldReader) ReadField(address []string) (FieldReadResult, error) { | ||
20 | return r.ReadFieldMerge(address, r.Levels[len(r.Levels)-1]) | ||
21 | } | ||
22 | |||
23 | func (r *MultiLevelFieldReader) ReadFieldExact( | ||
24 | address []string, level string) (FieldReadResult, error) { | ||
25 | reader, ok := r.Readers[level] | ||
26 | if !ok { | ||
27 | return FieldReadResult{}, fmt.Errorf( | ||
28 | "Unknown reader level: %s", level) | ||
29 | } | ||
30 | |||
31 | result, err := reader.ReadField(address) | ||
32 | if err != nil { | ||
33 | return FieldReadResult{}, fmt.Errorf( | ||
34 | "Error reading level %s: %s", level, err) | ||
35 | } | ||
36 | |||
37 | return result, nil | ||
38 | } | ||
39 | |||
40 | func (r *MultiLevelFieldReader) ReadFieldMerge( | ||
41 | address []string, level string) (FieldReadResult, error) { | ||
42 | var result FieldReadResult | ||
43 | for _, l := range r.Levels { | ||
44 | if r, ok := r.Readers[l]; ok { | ||
45 | out, err := r.ReadField(address) | ||
46 | if err != nil { | ||
47 | return FieldReadResult{}, fmt.Errorf( | ||
48 | "Error reading level %s: %s", l, err) | ||
49 | } | ||
50 | |||
51 | // TODO: computed | ||
52 | if out.Exists { | ||
53 | result = out | ||
54 | } | ||
55 | } | ||
56 | |||
57 | if l == level { | ||
58 | break | ||
59 | } | ||
60 | } | ||
61 | |||
62 | return result, nil | ||
63 | } | ||