92 lines
3.1 KiB
Go
92 lines
3.1 KiB
Go
package provider
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import (
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"bytes"
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"strings"
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"text/template"
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"github.com/BurntSushi/toml"
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"github.com/Masterminds/sprig"
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"github.com/containous/traefik/config"
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"github.com/containous/traefik/log"
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"github.com/containous/traefik/types"
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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" export:"true"`
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Filename string `description:"Override default configuration template. For advanced users :)" export:"true"`
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Constraints types.Constraints `description:"Filter services by constraint, matching with Traefik tags." export:"true"`
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Trace bool `description:"Display additional provider logs (if available)." export:"true"`
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DebugLogGeneratedTemplate bool `description:"Enable debug logging of generated configuration template." export:"true"`
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}
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// Init for compatibility reason the BaseProvider implements an empty Init.
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func (p *BaseProvider) Init() error {
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return nil
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}
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// MatchConstraints must match with EVERY single constraint
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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 constraints, 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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// CreateConfiguration creates a provider configuration from content using templating.
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func (p *BaseProvider) CreateConfiguration(tmplContent string, funcMap template.FuncMap, templateObjects interface{}) (*config.Configuration, error) {
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var defaultFuncMap = sprig.TxtFuncMap()
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// tolower is deprecated in favor of sprig's lower function
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defaultFuncMap["tolower"] = strings.ToLower
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defaultFuncMap["normalize"] = Normalize
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defaultFuncMap["split"] = split
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for funcID, funcElement := range funcMap {
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defaultFuncMap[funcID] = funcElement
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}
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tmpl := template.New(p.Filename).Funcs(defaultFuncMap)
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_, err := tmpl.Parse(tmplContent)
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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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var renderedTemplate = buffer.String()
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if p.DebugLogGeneratedTemplate {
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log.Debugf("Template content: %s", tmplContent)
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log.Debugf("Rendering results: %s", renderedTemplate)
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}
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return p.DecodeConfiguration(renderedTemplate)
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}
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// DecodeConfiguration Decodes a *types.Configuration from a content.
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func (p *BaseProvider) DecodeConfiguration(content string) (*config.Configuration, error) {
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configuration := new(config.Configuration)
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if _, err := toml.Decode(content, 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 split(sep, s string) []string {
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return strings.Split(s, sep)
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}
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