delete monitor (#1470)
This commit is contained in:
Asim Aslam
GitHub
parent
2cafa289b6
commit
31c4452fc7
@ -1,329 +0,0 @@
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package monitor
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import (
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"context"
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"errors"
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"sync"
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"time"
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"github.com/micro/go-micro/v2/client"
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pb "github.com/micro/go-micro/v2/debug/service/proto"
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"github.com/micro/go-micro/v2/registry"
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"github.com/micro/go-micro/v2/registry/cache"
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)
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type monitor struct {
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options Options
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exit chan bool
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registry cache.Cache
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client client.Client
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sync.RWMutex
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running bool
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services map[string]*Status
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}
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func (m *monitor) Check(service string) error {
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status, err := m.check(service)
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if err != nil {
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return err
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}
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m.Lock()
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m.services[service] = status
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m.Unlock()
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if status.Code != StatusRunning {
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return errors.New(status.Info)
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}
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return nil
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}
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// check provides binary running/failed status.
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// In the event Debug.Health cannot be called on a service we reap the node.
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func (m *monitor) check(service string) (*Status, error) {
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services, err := m.registry.GetService(service)
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if err != nil {
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return nil, err
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}
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// create debug client
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debug := pb.NewDebugService(service, m.client)
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var status *Status
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var gerr error
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// iterate through multiple versions of a service
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for _, service := range services {
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for _, node := range service.Nodes {
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// TODO: checks that are not just RPC based
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// TODO: better matching of the protocol
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// TODO: maybe everything has to be a go-micro service?
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if node.Metadata["server"] != m.client.String() {
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continue
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}
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// check the transport matches
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if node.Metadata["transport"] != m.client.Options().Transport.String() {
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continue
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}
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rsp, err := debug.Health(
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context.Background(),
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// empty health request
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&pb.HealthRequest{},
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// call this specific node
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client.WithAddress(node.Address),
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// retry in the event of failure
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client.WithRetries(3),
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)
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if err != nil {
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// save the error
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gerr = err
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continue
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}
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// expecting ok response status
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if rsp.Status != "ok" {
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gerr = errors.New(rsp.Status)
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continue
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}
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// no error set status
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status = &Status{
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Code: StatusRunning,
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Info: "running",
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}
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}
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}
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// if we got the success case return it
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if status != nil {
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return status, nil
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}
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// if gerr is not nil return it
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if gerr != nil {
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return &Status{
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Code: StatusFailed,
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Info: "not running",
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Error: gerr.Error(),
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}, nil
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}
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// otherwise unknown status
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return &Status{
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Code: StatusUnknown,
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Info: "unknown status",
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}, nil
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}
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func (m *monitor) reap() {
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services, err := m.registry.ListServices()
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if err != nil {
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return
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}
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serviceMap := make(map[string]bool)
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for _, service := range services {
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serviceMap[service.Name] = true
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}
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m.Lock()
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defer m.Unlock()
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// range over our watched services
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for service := range m.services {
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// check if the service exists in the registry
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if !serviceMap[service] {
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// if not, delete it in our status map
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delete(m.services, service)
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}
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}
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}
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func (m *monitor) run() {
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// check the status every tick
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t := time.NewTicker(time.Minute)
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defer t.Stop()
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// reap dead services
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t2 := time.NewTicker(time.Hour)
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defer t2.Stop()
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// list the known services
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services, _ := m.registry.ListServices()
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// create a check chan of same length
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check := make(chan string, len(services))
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// front-load the services to watch
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for _, service := range services {
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check <- service.Name
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}
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for {
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select {
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// exit if we're told to
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case <-m.exit:
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return
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// check a service when told to
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case service := <-check:
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// check the status
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status, err := m.check(service)
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if err != nil {
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status = &Status{
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Code: StatusUnknown,
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Info: "unknown status",
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}
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}
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// save the status
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m.Lock()
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m.services[service] = status
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m.Unlock()
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// on the tick interval get all services and issue a check
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case <-t.C:
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// create a list of services
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serviceMap := make(map[string]bool)
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m.RLock()
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for service := range m.services {
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serviceMap[service] = true
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}
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m.RUnlock()
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go func() {
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// check the status of all watched services
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for service := range serviceMap {
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select {
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case <-m.exit:
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return
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case check <- service:
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default:
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// barf if we block
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}
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}
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// list services
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services, _ := m.registry.ListServices()
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for _, service := range services {
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// start watching the service
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if ok := serviceMap[service.Name]; !ok {
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m.Watch(service.Name)
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}
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}
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}()
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case <-t2.C:
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// reap any dead/non-existent services
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m.reap()
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}
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}
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}
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func (m *monitor) Reap(service string) error {
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services, err := m.registry.GetService(service)
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if err != nil {
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return nil
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}
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m.Lock()
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defer m.Unlock()
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delete(m.services, service)
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for _, service := range services {
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m.registry.Deregister(service)
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}
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return nil
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}
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func (m *monitor) Status(service string) (Status, error) {
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m.RLock()
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defer m.RUnlock()
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if status, ok := m.services[service]; ok {
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return *status, nil
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}
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return Status{}, ErrNotWatching
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}
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func (m *monitor) Watch(service string) error {
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m.Lock()
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defer m.Unlock()
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// check if we're watching
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if _, ok := m.services[service]; ok {
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return nil
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}
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// get the status
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status, err := m.check(service)
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if err != nil {
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return err
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}
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// set the status
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m.services[service] = status
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return nil
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}
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func (m *monitor) Run() error {
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m.Lock()
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defer m.Unlock()
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if m.running {
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return nil
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}
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// reset the exit channel
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m.exit = make(chan bool)
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// setup a new cache
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m.registry = cache.New(m.options.Registry)
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// start running
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go m.run()
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// set to running
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m.running = true
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return nil
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}
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func (m *monitor) Stop() error {
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m.Lock()
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defer m.Unlock()
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if !m.running {
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return nil
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}
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select {
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case <-m.exit:
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return nil
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default:
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close(m.exit)
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for s := range m.services {
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delete(m.services, s)
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}
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m.registry.Stop()
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m.running = false
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return nil
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}
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}
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func newMonitor(opts ...Option) Monitor {
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options := Options{
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Client: client.DefaultClient,
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Registry: registry.DefaultRegistry,
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}
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for _, o := range opts {
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o(&options)
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}
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return &monitor{
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options: options,
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exit: make(chan bool),
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client: options.Client,
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registry: cache.New(options.Registry),
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services: make(map[string]*Status),
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}
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}
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@ -1,37 +0,0 @@
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package monitor
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import (
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"testing"
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)
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func TestMonitor(t *testing.T) {
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// create new monitor
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m := NewMonitor()
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if err := m.Run(); err != nil {
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t.Fatalf("failed to stop monitor: %v", err)
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}
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services := []string{"foo", "bar", "baz"}
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for _, service := range services {
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_, err := m.Status(service)
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if err == nil {
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t.Fatal("expected status error for unknown service")
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}
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if err := m.Watch(service); err == nil {
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t.Fatal("expected watch error for unknown service")
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}
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// TODO:
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// 1. start a service
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// 2. watch service
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// 3. get service status
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}
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// stop monitor
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if err := m.Stop(); err != nil {
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t.Fatalf("failed to stop monitor: %v", err)
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}
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}
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@ -1,45 +0,0 @@
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// Package monitor monitors service health
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package monitor
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import (
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"errors"
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)
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const (
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StatusUnknown StatusCode = iota
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StatusRunning
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StatusFailed
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)
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type StatusCode int
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// Monitor monitors a service and reaps dead instances
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type Monitor interface {
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// Reap a service and stop monitoring
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Reap(service string) error
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// Check the status of the service now
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Check(service string) error
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// Status of the service
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Status(service string) (Status, error)
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// Watch starts watching the service
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Watch(service string) error
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// Run the monitor to watch all services
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Run() error
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// Stop monitoring
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Stop() error
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}
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type Status struct {
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Code StatusCode
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Info string
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Error string
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}
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var (
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ErrNotWatching = errors.New("not watching")
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)
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// NewMonitor returns a new monitor
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func NewMonitor(opts ...Option) Monitor {
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return newMonitor(opts...)
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}
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@ -1,25 +0,0 @@
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package monitor
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import (
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"github.com/micro/go-micro/v2/client"
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"github.com/micro/go-micro/v2/registry"
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)
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type Options struct {
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Client client.Client
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Registry registry.Registry
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}
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type Option func(*Options)
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func Client(c client.Client) Option {
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return func(o *Options) {
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o.Client = c
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}
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}
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func Registry(r registry.Registry) Option {
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return func(o *Options) {
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o.Registry = r
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}
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}
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