122 lines
3.8 KiB
Go
122 lines
3.8 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/Masterminds/sprig"
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"github.com/containous/traefik/autogen"
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"github.com/containous/traefik/log"
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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.Constraints) 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" 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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// 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 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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// GetConfiguration return the provider configuration using templating
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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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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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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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var renderedTemplate = buffer.String()
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if p.DebugLogGeneratedTemplate {
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log.Debugf("Rendering results of %s:\n%s", defaultTemplateFile, renderedTemplate)
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}
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if _, err := toml.Decode(renderedTemplate, 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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// Normalize transform a string that work with the rest of traefik
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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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// ReverseStringSlice invert the order of the given slice of string
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func ReverseStringSlice(slice *[]string) {
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for i, j := 0, len(*slice)-1; i < j; i, j = i+1, j-1 {
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(*slice)[i], (*slice)[j] = (*slice)[j], (*slice)[i]
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}
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}
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