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
|
package templater
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path"
"strings"
"text/template"
"github.com/Masterminds/sprig"
"github.com/polydawn/meep"
"github.com/tazjin/kontemplate/context"
)
// Error that is caused by non-existent template files being specified
type TemplateNotFoundError struct {
meep.AllTraits
Name string
}
// Error that is caused during templating, e.g. required value being absent or invalid template format
type TemplatingError struct {
meep.TraitAutodescribing
meep.TraitCausable
}
func LoadAndPrepareTemplates(include *[]string, exclude *[]string, c *context.Context) (output []string, err error) {
limitedResourceSets := applyLimits(&c.ResourceSets, include, exclude)
for _, rs := range *limitedResourceSets {
err = processResourceSet(c, &rs, &output)
if err != nil {
return
}
}
return
}
func processResourceSet(c *context.Context, rs *context.ResourceSet, output *[]string) error {
fmt.Fprintf(os.Stderr, "Loading resources for %s\n", rs.Name)
rp := path.Join(c.BaseDir, rs.Name)
files, err := ioutil.ReadDir(rp)
err = processFiles(c, rs, rp, files, output)
if err != nil {
return meep.New(
&TemplateNotFoundError{Name: rs.Name},
meep.Cause(err),
)
}
return nil
}
func processFiles(c *context.Context, rs *context.ResourceSet, rp string, files []os.FileInfo, output *[]string) error {
for _, file := range files {
if !file.IsDir() && isResourceFile(file) {
p := path.Join(rp, file.Name())
o, err := templateFile(c, rs, p)
if err != nil {
return err
}
*output = append(*output, o)
}
}
return nil
}
func templateFile(c *context.Context, rs *context.ResourceSet, filename string) (string, error) {
tpl, err := template.New(path.Base(filename)).Funcs(templateFuncs()).ParseFiles(filename)
if err != nil {
return "", meep.New(
&TemplateNotFoundError{Name: filename},
meep.Cause(err),
)
}
var b bytes.Buffer
// Guard against empty map before merging keys
if rs.Values == nil {
rs.Values = make(map[string]interface{}, 0)
}
// Merge global and resourceset-specific values (don't override from global)
for k, v := range c.Global {
if _, ok := rs.Values[k]; !ok {
rs.Values[k] = v
}
}
err = tpl.Execute(&b, rs.Values)
if err != nil {
return "", meep.New(
&TemplatingError{},
meep.Cause(err),
)
}
return b.String(), nil
}
// Applies the limits of explicitly included or excluded resources and returns the updated resource set.
// Exclude takes priority over include
func applyLimits(rs *[]context.ResourceSet, include *[]string, exclude *[]string) *[]context.ResourceSet {
if len(*include) == 0 && len(*exclude) == 0 {
return rs
}
// Exclude excluded resource sets
excluded := make([]context.ResourceSet, 0)
for _, r := range *rs {
if !matchesResourceSet(exclude, &r) {
excluded = append(excluded, r)
}
}
// Include included resource sets
if len(*include) == 0 {
return &excluded
}
included := make([]context.ResourceSet, 0)
for _, r := range excluded {
if matchesResourceSet(include, &r) {
included = append(included, r)
}
}
return &included
}
// Check whether an include/exclude string slice matches a resource set
func matchesResourceSet(s *[]string, rs *context.ResourceSet) bool {
for _, r := range *s {
if r == rs.Name || r == rs.Parent {
return true
}
}
return false
}
func templateFuncs() template.FuncMap {
m := sprig.TxtFuncMap()
m["json"] = func(data interface{}) string {
b, _ := json.Marshal(data)
return string(b)
}
return m
}
// Checks whether a file is a resource file (i.e. is YAML or JSON)
func isResourceFile(f os.FileInfo) bool {
return strings.HasSuffix(f.Name(), "yaml") ||
strings.HasSuffix(f.Name(), "yml") ||
strings.HasSuffix(f.Name(), "json")
}
|
