305 lines
8.8 KiB
Go
305 lines
8.8 KiB
Go
package mesos
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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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"time"
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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/provider/label"
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"github.com/containous/traefik/types"
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"github.com/mesosphere/mesos-dns/records"
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"github.com/mesosphere/mesos-dns/records/state"
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)
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func (p *Provider) buildConfiguration() *types.Configuration {
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var mesosFuncMap = template.FuncMap{
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"getBackend": getBackend,
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"getPort": p.getPort,
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"getHost": p.getHost,
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"getWeight": getFuncApplicationStringValue(label.TraefikWeight, label.DefaultWeight),
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"getDomain": getFuncStringValue(label.TraefikDomain, p.Domain),
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"getProtocol": getFuncApplicationStringValue(label.TraefikProtocol, label.DefaultProtocol),
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"getPassHostHeader": getFuncStringValue(label.TraefikFrontendPassHostHeader, label.DefaultPassHostHeader),
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"getPriority": getFuncStringValue(label.TraefikFrontendPriority, label.DefaultFrontendPriority),
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"getEntryPoints": getFuncSliceStringValue(label.TraefikFrontendEntryPoints),
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"getFrontendRule": p.getFrontendRule,
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"getFrontendBackend": getFrontendBackend,
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"getID": getID,
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"getFrontEndName": getFrontEndName,
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}
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rg := records.NewRecordGenerator(time.Duration(p.StateTimeoutSecond) * time.Second)
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st, err := rg.FindMaster(p.Masters...)
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if err != nil {
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log.Errorf("Failed to create a client for Mesos, error: %v", err)
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return nil
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}
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tasks := taskRecords(st)
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// filter tasks
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filteredTasks := fun.Filter(func(task state.Task) bool {
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return taskFilter(task, p.ExposedByDefault)
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}, tasks).([]state.Task)
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uniqueApps := make(map[string]state.Task)
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for _, value := range filteredTasks {
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if _, ok := uniqueApps[value.DiscoveryInfo.Name]; !ok {
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uniqueApps[value.DiscoveryInfo.Name] = value
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}
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}
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var filteredApps []state.Task
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for _, value := range uniqueApps {
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filteredApps = append(filteredApps, value)
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}
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templateObjects := struct {
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Applications []state.Task
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Tasks []state.Task
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Domain string
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}{
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Applications: filteredApps,
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Tasks: filteredTasks,
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Domain: p.Domain,
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}
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configuration, err := p.GetConfiguration("templates/mesos.tmpl", mesosFuncMap, 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 taskRecords(st state.State) []state.Task {
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var tasks []state.Task
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for _, f := range st.Frameworks {
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for _, task := range f.Tasks {
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for _, slave := range st.Slaves {
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if task.SlaveID == slave.ID {
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task.SlaveIP = slave.Hostname
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}
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}
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// only do running and discoverable tasks
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if task.State == "TASK_RUNNING" {
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tasks = append(tasks, task)
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}
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}
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}
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return tasks
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}
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func taskFilter(task state.Task, exposedByDefaultFlag bool) bool {
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if len(task.DiscoveryInfo.Ports.DiscoveryPorts) == 0 {
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log.Debugf("Filtering Mesos task without port %s", task.Name)
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return false
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}
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if !isEnabled(task, exposedByDefaultFlag) {
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log.Debugf("Filtering disabled Mesos task %s", task.DiscoveryInfo.Name)
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return false
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}
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// filter indeterminable task port
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portIndexLabel := getStringValue(task, label.TraefikPortIndex, "")
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portValueLabel := getStringValue(task, label.TraefikPort, "")
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if portIndexLabel != "" && portValueLabel != "" {
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log.Debugf("Filtering Mesos task %s specifying both %q' and %q labels", task.Name, label.TraefikPortIndex, label.TraefikPort)
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return false
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}
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if portIndexLabel != "" {
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index, err := strconv.Atoi(portIndexLabel)
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if err != nil || index < 0 || index > len(task.DiscoveryInfo.Ports.DiscoveryPorts)-1 {
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log.Debugf("Filtering Mesos task %s with unexpected value for %q label", task.Name, label.TraefikPortIndex)
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return false
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}
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}
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if portValueLabel != "" {
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port, err := strconv.Atoi(portValueLabel)
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if err != nil {
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log.Debugf("Filtering Mesos task %s with unexpected value for %q label", task.Name, label.TraefikPort)
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return false
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}
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var foundPort bool
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for _, exposedPort := range task.DiscoveryInfo.Ports.DiscoveryPorts {
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if port == exposedPort.Number {
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foundPort = true
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break
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}
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}
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if !foundPort {
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log.Debugf("Filtering Mesos task %s without a matching port for %q label", task.Name, label.TraefikPort)
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return false
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}
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}
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//filter healthChecks
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if task.Statuses != nil && len(task.Statuses) > 0 && task.Statuses[0].Healthy != nil && !*task.Statuses[0].Healthy {
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log.Debugf("Filtering Mesos task %s with bad healthCheck", task.DiscoveryInfo.Name)
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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 getID(task state.Task) string {
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return provider.Normalize(task.ID)
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}
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func getBackend(task state.Task, apps []state.Task) string {
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application, err := getApplication(task, apps)
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if err != nil {
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log.Error(err)
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return ""
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}
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return getFrontendBackend(application)
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}
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func getFrontendBackend(task state.Task) string {
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if value := getStringValue(task, label.TraefikBackend, ""); len(value) > 0 {
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return value
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}
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return "-" + provider.Normalize(task.DiscoveryInfo.Name)
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}
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func getFrontEndName(task state.Task) string {
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return provider.Normalize(task.ID)
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}
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func (p *Provider) getPort(task state.Task, applications []state.Task) string {
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application, err := getApplication(task, applications)
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if err != nil {
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log.Error(err)
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return ""
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}
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plv := getIntValue(application, label.TraefikPortIndex, math.MinInt32, len(task.DiscoveryInfo.Ports.DiscoveryPorts)-1)
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if plv >= 0 {
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return strconv.Itoa(task.DiscoveryInfo.Ports.DiscoveryPorts[plv].Number)
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}
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if pv := getStringValue(application, label.TraefikPort, ""); len(pv) > 0 {
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return pv
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}
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for _, port := range task.DiscoveryInfo.Ports.DiscoveryPorts {
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return strconv.Itoa(port.Number)
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}
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return ""
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}
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// getFrontendRule returns the frontend rule for the specified application, using
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// it's label. It returns a default one (Host) if the label is not present.
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func (p *Provider) getFrontendRule(task state.Task) string {
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if v := getStringValue(task, label.TraefikFrontendRule, ""); len(v) > 0 {
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return v
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}
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return "Host:" + strings.ToLower(strings.Replace(p.getSubDomain(task.DiscoveryInfo.Name), "_", "-", -1)) + "." + p.Domain
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}
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func (p *Provider) getHost(task state.Task) string {
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return task.IP(strings.Split(p.IPSources, ",")...)
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}
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func (p *Provider) getSubDomain(name string) string {
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if p.GroupsAsSubDomains {
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splitedName := strings.Split(strings.TrimPrefix(name, "/"), "/")
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provider.ReverseStringSlice(&splitedName)
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reverseName := strings.Join(splitedName, ".")
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return reverseName
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}
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return strings.Replace(strings.TrimPrefix(name, "/"), "/", "-", -1)
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}
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// Label functions
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func getFuncApplicationStringValue(labelName string, defaultValue string) func(task state.Task, applications []state.Task) string {
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return func(task state.Task, applications []state.Task) string {
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app, err := getApplication(task, applications)
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if err == nil {
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return getStringValue(app, labelName, defaultValue)
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}
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log.Error(err)
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return defaultValue
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}
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}
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func getFuncStringValue(labelName string, defaultValue string) func(task state.Task) string {
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return func(task state.Task) string {
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return getStringValue(task, labelName, defaultValue)
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}
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}
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func getFuncSliceStringValue(labelName string) func(task state.Task) []string {
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return func(task state.Task) []string {
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return getSliceStringValue(task, labelName)
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}
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}
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func getStringValue(task state.Task, labelName string, defaultValue string) string {
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for _, lbl := range task.Labels {
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if lbl.Key == labelName {
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return lbl.Value
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}
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}
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return defaultValue
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}
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func getBoolValue(task state.Task, labelName string, defaultValue bool) bool {
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for _, lbl := range task.Labels {
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if lbl.Key == labelName {
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v, err := strconv.ParseBool(lbl.Value)
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if err == nil {
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return v
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}
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}
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}
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return defaultValue
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}
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func getIntValue(task state.Task, labelName string, defaultValue int, maxValue int) int {
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for _, lbl := range task.Labels {
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if lbl.Key == labelName {
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value, err := strconv.Atoi(lbl.Value)
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if err == nil {
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if value <= maxValue {
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return value
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}
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log.Warnf("The value %q for %q exceed the max authorized value %q, falling back to %v.", lbl.Value, labelName, maxValue, defaultValue)
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} else {
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log.Warnf("Unable to parse %q: %q, falling back to %v. %v", labelName, lbl.Value, defaultValue, err)
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}
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}
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}
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return defaultValue
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}
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func getSliceStringValue(task state.Task, labelName string) []string {
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for _, lbl := range task.Labels {
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if lbl.Key == labelName {
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return label.SplitAndTrimString(lbl.Value, ",")
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}
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}
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return nil
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}
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func getApplication(task state.Task, apps []state.Task) (state.Task, error) {
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for _, app := range apps {
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if app.DiscoveryInfo.Name == task.DiscoveryInfo.Name {
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return app, nil
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}
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}
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return state.Task{}, fmt.Errorf("unable to get Mesos application from task %s", task.DiscoveryInfo.Name)
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}
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func isEnabled(task state.Task, exposedByDefault bool) bool {
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return getBoolValue(task, label.TraefikEnable, exposedByDefault)
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}
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