319 lines
10 KiB
Go
319 lines
10 KiB
Go
package rancher
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import (
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"fmt"
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"math"
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"strconv"
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"strings"
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"text/template"
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"github.com/BurntSushi/ty/fun"
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"github.com/containous/traefik/log"
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"github.com/containous/traefik/provider"
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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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var _ provider.Provider = (*Provider)(nil)
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// Provider holds configurations of the provider.
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type Provider struct {
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provider.BaseProvider `mapstructure:",squash" export:"true"`
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APIConfiguration `mapstructure:",squash" export:"true"` // Provide backwards compatibility
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API *APIConfiguration `description:"Enable the Rancher API provider" export:"true"`
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Metadata *MetadataConfiguration `description:"Enable the Rancher metadata service provider" export:"true"`
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Domain string `description:"Default domain used"`
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RefreshSeconds int `description:"Polling interval (in seconds)" export:"true"`
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ExposedByDefault bool `description:"Expose services by default" export:"true"`
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EnableServiceHealthFilter bool `description:"Filter services with unhealthy states and inactive states" export:"true"`
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}
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type rancherData struct {
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Name string
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Labels map[string]string // List of labels set to container or service
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Containers []string
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Health string
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State string
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}
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func (r rancherData) String() string {
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return fmt.Sprintf("{name:%s, labels:%v, containers: %v, health: %s, state: %s}", r.Name, r.Labels, r.Containers, r.Health, r.State)
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}
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// Frontend Labels
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func (p *Provider) getPassHostHeader(service rancherData) string {
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if passHostHeader, err := getServiceLabel(service, types.LabelFrontendPassHostHeader); err == nil {
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return passHostHeader
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}
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return "true"
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}
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func (p *Provider) getPriority(service rancherData) string {
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if priority, err := getServiceLabel(service, types.LabelFrontendPriority); err == nil {
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return priority
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}
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return "0"
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}
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func (p *Provider) getEntryPoints(service rancherData) []string {
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if entryPoints, err := getServiceLabel(service, types.LabelFrontendEntryPoints); err == nil {
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return strings.Split(entryPoints, ",")
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}
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return []string{}
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}
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func (p *Provider) getFrontendRule(service rancherData) string {
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if label, err := getServiceLabel(service, types.LabelFrontendRule); err == nil {
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return label
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}
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return "Host:" + strings.ToLower(strings.Replace(service.Name, "/", ".", -1)) + "." + p.Domain
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}
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func (p *Provider) getBasicAuth(service rancherData) []string {
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if basicAuth, err := getServiceLabel(service, types.LabelFrontendAuthBasic); err == nil {
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return strings.Split(basicAuth, ",")
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}
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return []string{}
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}
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func (p *Provider) getFrontendName(service rancherData) string {
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// Replace '.' with '-' in quoted keys because of this issue https://github.com/BurntSushi/toml/issues/78
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return provider.Normalize(p.getFrontendRule(service))
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}
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// Backend Labels
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func (p *Provider) getLoadBalancerMethod(service rancherData) string {
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if label, err := getServiceLabel(service, types.LabelBackendLoadbalancerMethod); err == nil {
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return label
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}
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return "wrr"
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}
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func (p *Provider) hasLoadBalancerLabel(service rancherData) bool {
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_, errMethod := getServiceLabel(service, types.LabelBackendLoadbalancerMethod)
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_, errSticky := getServiceLabel(service, types.LabelBackendLoadbalancerSticky)
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if errMethod != nil && errSticky != nil {
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return false
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}
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return true
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}
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func (p *Provider) hasCircuitBreakerLabel(service rancherData) bool {
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if _, err := getServiceLabel(service, types.LabelBackendCircuitbreakerExpression); err != nil {
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return false
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}
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return true
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}
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func (p *Provider) getCircuitBreakerExpression(service rancherData) string {
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if label, err := getServiceLabel(service, types.LabelBackendCircuitbreakerExpression); err == nil {
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return label
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}
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return "NetworkErrorRatio() > 1"
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}
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func (p *Provider) getSticky(service rancherData) string {
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if _, err := getServiceLabel(service, types.LabelBackendLoadbalancerSticky); err == nil {
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return "true"
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}
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return "false"
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}
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func (p *Provider) getBackend(service rancherData) string {
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if label, err := getServiceLabel(service, types.LabelBackend); err == nil {
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return provider.Normalize(label)
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}
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return provider.Normalize(service.Name)
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}
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// General Application Stuff
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func (p *Provider) getPort(service rancherData) string {
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if label, err := getServiceLabel(service, types.LabelPort); err == nil {
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return label
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}
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return ""
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}
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func (p *Provider) getProtocol(service rancherData) string {
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if label, err := getServiceLabel(service, types.LabelProtocol); err == nil {
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return label
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}
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return "http"
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}
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func (p *Provider) getWeight(service rancherData) string {
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if label, err := getServiceLabel(service, types.LabelWeight); err == nil {
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return label
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}
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return "0"
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}
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func (p *Provider) getDomain(service rancherData) string {
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if label, err := getServiceLabel(service, types.LabelDomain); err == nil {
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return label
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}
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return p.Domain
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}
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func (p *Provider) hasMaxConnLabels(service rancherData) bool {
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if _, err := getServiceLabel(service, types.LabelBackendMaxconnAmount); err != nil {
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return false
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}
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if _, err := getServiceLabel(service, types.LabelBackendMaxconnExtractorfunc); err != nil {
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return false
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}
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return true
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}
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func (p *Provider) getMaxConnAmount(service rancherData) int64 {
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if label, err := getServiceLabel(service, types.LabelBackendMaxconnAmount); err == nil {
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i, errConv := strconv.ParseInt(label, 10, 64)
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if errConv != nil {
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log.Errorf("Unable to parse %s %s", types.LabelBackendMaxconnAmount, label)
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return math.MaxInt64
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}
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return i
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}
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return math.MaxInt64
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}
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func (p *Provider) getMaxConnExtractorFunc(service rancherData) string {
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if label, err := getServiceLabel(service, types.LabelBackendMaxconnExtractorfunc); err == nil {
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return label
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}
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return "request.host"
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}
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func getServiceLabel(service rancherData, label string) (string, error) {
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for key, value := range service.Labels {
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if key == label {
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return value, nil
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}
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}
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return "", fmt.Errorf("label not found: %s", label)
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}
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// Provide allows either the Rancher API or metadata service provider to
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// seed configuration into Traefik using the given configuration channel.
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func (p *Provider) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
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if p.Metadata == nil {
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return p.apiProvide(configurationChan, pool, constraints)
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}
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return p.metadataProvide(configurationChan, pool, constraints)
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}
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func (p *Provider) loadRancherConfig(services []rancherData) *types.Configuration {
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var RancherFuncMap = template.FuncMap{
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"getPort": p.getPort,
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"getBackend": p.getBackend,
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"getWeight": p.getWeight,
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"getDomain": p.getDomain,
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"getProtocol": p.getProtocol,
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"getPassHostHeader": p.getPassHostHeader,
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"getPriority": p.getPriority,
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"getEntryPoints": p.getEntryPoints,
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"getBasicAuth": p.getBasicAuth,
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"getFrontendRule": p.getFrontendRule,
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"hasCircuitBreakerLabel": p.hasCircuitBreakerLabel,
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"getCircuitBreakerExpression": p.getCircuitBreakerExpression,
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"hasLoadBalancerLabel": p.hasLoadBalancerLabel,
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"getLoadBalancerMethod": p.getLoadBalancerMethod,
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"hasMaxConnLabels": p.hasMaxConnLabels,
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"getMaxConnAmount": p.getMaxConnAmount,
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"getMaxConnExtractorFunc": p.getMaxConnExtractorFunc,
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"getSticky": p.getSticky,
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}
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// filter services
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filteredServices := fun.Filter(func(service rancherData) bool {
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return p.serviceFilter(service)
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}, services).([]rancherData)
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frontends := map[string]rancherData{}
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backends := map[string]rancherData{}
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for _, service := range filteredServices {
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frontendName := p.getFrontendName(service)
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frontends[frontendName] = service
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backendName := p.getBackend(service)
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backends[backendName] = service
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}
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templateObjects := struct {
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Frontends map[string]rancherData
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Backends map[string]rancherData
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Domain string
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}{
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frontends,
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backends,
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p.Domain,
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}
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configuration, err := p.GetConfiguration("templates/rancher.tmpl", RancherFuncMap, templateObjects)
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if err != nil {
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log.Error(err)
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}
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return configuration
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}
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func containerFilter(name, healthState, state string) bool {
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if healthState != "" && healthState != "healthy" && healthState != "updating-healthy" {
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log.Debugf("Filtering container %s with healthState of %s", name, healthState)
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return false
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}
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if state != "" && state != "running" && state != "updating-running" {
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log.Debugf("Filtering container %s with state of %s", name, state)
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return false
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}
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return true
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}
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func (p *Provider) serviceFilter(service rancherData) bool {
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if service.Labels[types.LabelPort] == "" {
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log.Debugf("Filtering service %s without traefik.port label", service.Name)
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return false
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}
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if !isServiceEnabled(service, p.ExposedByDefault) {
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log.Debugf("Filtering disabled service %s", service.Name)
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return false
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}
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constraintTags := strings.Split(service.Labels[types.LabelTags], ",")
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if ok, failingConstraint := p.MatchConstraints(constraintTags); !ok {
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if failingConstraint != nil {
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log.Debugf("Filtering service %s with constraint %s", service.Name, failingConstraint.String())
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}
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return false
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}
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// Only filter services by Health (HealthState) and State if EnableServiceHealthFilter is true
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if p.EnableServiceHealthFilter {
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if service.Health != "" && service.Health != "healthy" && service.Health != "updating-healthy" {
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log.Debugf("Filtering service %s with healthState of %s", service.Name, service.Health)
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return false
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}
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if service.State != "" && service.State != "active" && service.State != "updating-active" && service.State != "upgraded" {
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log.Debugf("Filtering service %s with state of %s", service.Name, service.State)
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return false
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}
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}
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return true
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}
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func isServiceEnabled(service rancherData, exposedByDefault bool) bool {
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if service.Labels[types.LabelEnable] != "" {
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var v = service.Labels[types.LabelEnable]
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return exposedByDefault && v != "false" || v == "true"
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}
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return exposedByDefault
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}
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