100 lines
2.7 KiB
Go
100 lines
2.7 KiB
Go
package consul
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import (
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"context"
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"errors"
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"fmt"
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"time"
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"github.com/kvtools/consul"
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"github.com/traefik/traefik/v3/pkg/provider"
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"github.com/traefik/traefik/v3/pkg/provider/kv"
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"github.com/traefik/traefik/v3/pkg/types"
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)
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// providerName is the Consul provider name.
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const providerName = "consul"
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var _ provider.Provider = (*Provider)(nil)
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// ProviderBuilder is responsible for constructing namespaced instances of the Consul provider.
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type ProviderBuilder struct {
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kv.Provider `yaml:",inline" export:"true"`
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Token string `description:"Per-request ACL token." json:"token,omitempty" toml:"token,omitempty" yaml:"token,omitempty" loggable:"false"`
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TLS *types.ClientTLS `description:"Enable TLS support." json:"tls,omitempty" toml:"tls,omitempty" yaml:"tls,omitempty" export:"true"`
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Namespaces []string `description:"Sets the namespaces used to discover the configuration (Consul Enterprise only)." json:"namespaces,omitempty" toml:"namespaces,omitempty" yaml:"namespaces,omitempty"`
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}
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// SetDefaults sets the default values.
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func (p *ProviderBuilder) SetDefaults() {
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p.Provider.SetDefaults()
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p.Endpoints = []string{"127.0.0.1:8500"}
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}
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// BuildProviders builds Consul provider instances for the given namespaces configuration.
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func (p *ProviderBuilder) BuildProviders() []*Provider {
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if len(p.Namespaces) == 0 {
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return []*Provider{{
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Provider: p.Provider,
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name: providerName,
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token: p.Token,
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tls: p.TLS,
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}}
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}
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var providers []*Provider
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for _, namespace := range p.Namespaces {
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providers = append(providers, &Provider{
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Provider: p.Provider,
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name: providerName + "-" + namespace,
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namespace: namespace,
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token: p.Token,
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tls: p.TLS,
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})
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}
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return providers
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}
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// Provider holds configurations of the provider.
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type Provider struct {
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kv.Provider
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name string
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namespace string
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token string
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tls *types.ClientTLS
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}
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// Init the provider.
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func (p *Provider) Init() error {
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// Wildcard namespace allows fetching KV values from any namespace for recursive requests (see https://www.consul.io/api/kv#ns).
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// As we are not supporting multiple namespaces at the same time, wildcard namespace is not allowed.
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if p.namespace == "*" {
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return errors.New("wildcard namespace is not supported")
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}
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// In case they didn't initialize with BuildProviders.
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if p.name == "" {
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p.name = providerName
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}
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config := &consul.Config{
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ConnectionTimeout: 3 * time.Second,
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Token: p.token,
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Namespace: p.namespace,
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}
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if p.tls != nil {
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var err error
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config.TLS, err = p.tls.CreateTLSConfig(context.Background())
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if err != nil {
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return fmt.Errorf("unable to create client TLS configuration: %w", err)
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}
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}
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return p.Provider.Init(consul.StoreName, p.name, config)
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}
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