95 lines
2.6 KiB
Go
95 lines
2.6 KiB
Go
package provider
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import (
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"bytes"
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"io/ioutil"
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"strings"
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"text/template"
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"unicode"
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"github.com/BurntSushi/toml"
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"github.com/containous/traefik/autogen"
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"github.com/containous/traefik/safe"
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"github.com/containous/traefik/types"
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)
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// Provider defines methods of a provider.
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type Provider interface {
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// Provide allows the provider to provide configurations to traefik
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// using the given configuration channel.
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Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints []types.Constraint) error
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}
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// BaseProvider should be inherited by providers
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type BaseProvider struct {
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Watch bool `description:"Watch provider"`
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Filename string `description:"Override default configuration template. For advanced users :)"`
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Constraints types.Constraints `description:"Filter services by constraint, matching with Traefik tags."`
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}
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// MatchConstraints must match with EVERY single contraint
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// returns first constraint that do not match or nil
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func (p *BaseProvider) MatchConstraints(tags []string) (bool, *types.Constraint) {
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// if there is no tags and no contraints, filtering is disabled
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if len(tags) == 0 && len(p.Constraints) == 0 {
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return true, nil
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}
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for _, constraint := range p.Constraints {
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// xor: if ok and constraint.MustMatch are equal, then no tag is currently matching with the constraint
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if ok := constraint.MatchConstraintWithAtLeastOneTag(tags); ok != constraint.MustMatch {
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return false, &constraint
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}
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}
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// If no constraint or every constraints matching
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return true, nil
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}
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func (p *BaseProvider) getConfiguration(defaultTemplateFile string, funcMap template.FuncMap, templateObjects interface{}) (*types.Configuration, error) {
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var (
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buf []byte
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err error
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)
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configuration := new(types.Configuration)
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tmpl := template.New(p.Filename).Funcs(funcMap)
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if len(p.Filename) > 0 {
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buf, err = ioutil.ReadFile(p.Filename)
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if err != nil {
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return nil, err
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}
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} else {
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buf, err = autogen.Asset(defaultTemplateFile)
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if err != nil {
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return nil, err
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}
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}
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_, err = tmpl.Parse(string(buf))
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if err != nil {
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return nil, err
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}
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var buffer bytes.Buffer
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err = tmpl.Execute(&buffer, templateObjects)
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if err != nil {
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return nil, err
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}
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if _, err := toml.Decode(buffer.String(), configuration); err != nil {
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return nil, err
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}
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return configuration, nil
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}
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func replace(s1 string, s2 string, s3 string) string {
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return strings.Replace(s3, s1, s2, -1)
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}
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func normalize(name string) string {
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fargs := func(c rune) bool {
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return !unicode.IsLetter(c) && !unicode.IsNumber(c)
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}
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// get function
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return strings.Join(strings.FieldsFunc(name, fargs), "-")
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}
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