/
automanaged.go
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/
automanaged.go
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package automanaged
import (
"encoding/json"
"fmt"
"log/slog"
"net"
"net/http"
"sync"
"time"
"golang.org/x/net/context"
"github.com/asynkron/protoactor-go/cluster"
"github.com/labstack/echo"
"golang.org/x/sync/errgroup"
)
// TODO: needs to be attached to the provider instance
var (
clusterTTLErrorMutex = new(sync.Mutex)
clusterMonitorErrorMutex = new(sync.Mutex)
shutdownMutex = new(sync.Mutex)
deregisteredMutex = new(sync.Mutex)
activeProviderMutex = new(sync.Mutex)
activeProviderRunningMutex = new(sync.Mutex)
)
type AutoManagedProvider struct {
deregistered bool
shutdown bool
activeProvider *echo.Echo
activeProviderRunning bool
activeProviderTesting bool
httpClient *http.Client
monitoringStatus bool
clusterName string
address string
autoManagePort int
memberPort int
knownKinds []string
knownNodes []*NodeModel
hosts []string
refreshTTL time.Duration
clusterTTLError error
clusterMonitorError error
cluster *cluster.Cluster
}
// New creates a AutoManagedProvider that connects locally
func New() *AutoManagedProvider {
return NewWithConfig(
2*time.Second,
6330,
"localhost:6330",
)
}
// NewWithConfig creates an Automanaged Provider that connects to an all the hosts
func NewWithConfig(refreshTTL time.Duration, autoManPort int, hosts ...string) *AutoManagedProvider {
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 5 * time.Second,
KeepAlive: 5 * time.Second,
}).DialContext,
MaxIdleConns: 10,
IdleConnTimeout: 90 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
MaxConnsPerHost: 10,
}
httpClient := &http.Client{
Transport: transport,
Timeout: 2 * time.Second,
}
p := &AutoManagedProvider{
hosts: hosts,
httpClient: httpClient,
refreshTTL: refreshTTL,
autoManagePort: autoManPort,
activeProviderRunning: false,
monitoringStatus: false,
}
return p
}
// NewWithTesting creates a testable provider
func NewWithTesting(refreshTTL time.Duration, autoManPort int, activeProvider *echo.Echo, hosts ...string) *AutoManagedProvider {
p := NewWithConfig(refreshTTL, autoManPort, hosts...)
p.activeProviderTesting = true
p.activeProvider = activeProvider
return p
}
func (p *AutoManagedProvider) init(cluster *cluster.Cluster) error {
host, port, err := cluster.ActorSystem.GetHostPort()
if err != nil {
return err
}
p.clusterName = cluster.Config.Name
p.address = host
p.memberPort = port
p.knownKinds = cluster.GetClusterKinds()
p.deregistered = false
p.shutdown = false
p.cluster = cluster
return nil
}
func (p *AutoManagedProvider) StartMember(cluster *cluster.Cluster) error {
if err := p.init(cluster); err != nil {
return err
}
p.UpdateTTL()
p.monitorMemberStatusChanges()
return nil
}
func (p *AutoManagedProvider) StartClient(cluster *cluster.Cluster) error {
if err := p.init(cluster); err != nil {
return err
}
// p.UpdateTTL()
p.monitorMemberStatusChanges()
return nil
}
// DeregisterMember set the shutdown to true preventing anymore TTL updates
func (p *AutoManagedProvider) DeregisterMember() error {
deregisteredMutex.Lock()
defer deregisteredMutex.Unlock()
p.deregistered = true
return nil
}
// Shutdown set the shutdown to true preventing anymore TTL updates
func (p *AutoManagedProvider) Shutdown(graceful bool) error {
shutdownMutex.Lock()
defer shutdownMutex.Unlock()
p.shutdown = true
p.activeProvider.Close()
return nil
}
// UpdateTTL sets up an endpoint to respond to other members
func (p *AutoManagedProvider) UpdateTTL() {
activeProviderRunningMutex.Lock()
running := p.activeProviderRunning
activeProviderRunningMutex.Unlock()
if (p.isShutdown() || p.isDeregistered()) && running {
p.activeProvider.Close()
return
}
if running {
return
}
// it's not running, and it's not shutdown or de-registered
// it's also not a test (this should be refactored)
if !p.activeProviderTesting {
p.activeProvider = echo.New()
p.activeProvider.HideBanner = true
p.activeProvider.GET("/_health", func(context echo.Context) error {
return context.JSON(http.StatusOK, p.getCurrentNode())
})
}
go func() {
activeProviderRunningMutex.Lock()
p.activeProviderRunning = true
activeProviderRunningMutex.Unlock()
appURI := fmt.Sprintf("0.0.0.0:%d", p.autoManagePort)
p.cluster.Logger().Error("Automanaged server stopping..!", slog.Any("error", p.activeProvider.Start(appURI)))
activeProviderRunningMutex.Lock()
p.activeProviderRunning = false
activeProviderRunningMutex.Unlock()
}()
}
// MonitorMemberStatusChanges creates a go routine that continuously checks other members
func (p *AutoManagedProvider) monitorMemberStatusChanges() {
if !p.monitoringStatus {
go func() {
for !p.isShutdown() && !p.isDeregistered() {
p.monitorStatuses()
}
}()
}
p.monitoringStatus = true
}
// GetHealthStatus returns an error if the cluster health status has problems
func (p *AutoManagedProvider) GetHealthStatus() error {
var err error
clusterTTLErrorMutex.Lock()
clusterMonitorErrorMutex.Lock()
defer clusterMonitorErrorMutex.Unlock()
defer clusterTTLErrorMutex.Unlock()
if p.clusterTTLError != nil {
err = fmt.Errorf("TTL: %s", p.clusterTTLError.Error())
}
if p.clusterMonitorError != nil {
if err != nil {
err = fmt.Errorf("%s - Monitor: %s", err.Error(), p.clusterMonitorError.Error())
} else {
err = fmt.Errorf("monitor: %s", p.clusterMonitorError.Error())
}
}
return err
}
//
// Private methods
//
// monitorStatuses checks for node changes in the cluster
func (p *AutoManagedProvider) monitorStatuses() {
clusterMonitorErrorMutex.Lock()
defer clusterMonitorErrorMutex.Unlock()
autoManagedNodes, err := p.checkNodes()
if err != nil && len(autoManagedNodes) == 0 {
p.cluster.Logger().Error("Failure reaching nodes", slog.Any("error", err))
p.clusterMonitorError = err
time.Sleep(p.refreshTTL)
return
}
// we should probably check if the cluster needs to be updated.
var members []*cluster.Member
var newNodes []*NodeModel
for _, node := range autoManagedNodes {
if node == nil || node.ClusterName != p.clusterName {
continue
}
ms := &cluster.Member{
Id: node.ID,
Host: node.Address,
Port: int32(node.Port),
Kinds: node.Kinds,
}
members = append(members, ms)
newNodes = append(newNodes, node)
}
p.knownNodes = newNodes
p.clusterMonitorError = nil
// publish the current cluster topology onto the event stream
p.cluster.MemberList.UpdateClusterTopology(members)
time.Sleep(p.refreshTTL)
}
// checkNodes pings all the nodes and returns the new cluster topology
func (p *AutoManagedProvider) checkNodes() ([]*NodeModel, error) {
allNodes := make([]*NodeModel, len(p.hosts))
g, _ := errgroup.WithContext(context.Background())
for indice, nodeHost := range p.hosts {
idx, el := indice, nodeHost // https://golang.org/doc/faq#closures_and_goroutines
// Calling go funcs to execute the node check
g.Go(func() error {
url := fmt.Sprintf("http://%s/_health", el)
req, err := http.NewRequest("GET", url, nil)
if err != nil {
p.cluster.Logger().Error("Couldn't request node health status", slog.Any("error", err), slog.String("autoManMemberUrl", url))
return err
}
resp, err := p.httpClient.Do(req)
if err != nil {
p.cluster.Logger().Error("Bad connection to the node health status", slog.Any("error", err), slog.String("autoManMemberUrl", url))
return err
}
defer resp.Body.Close() // nolint: errcheck
if resp.StatusCode != http.StatusOK {
err = fmt.Errorf("non 200 status returned: %d - from node: %s", resp.StatusCode, el)
p.cluster.Logger().Error("Bad response from the node health status", slog.Any("error", err), slog.String("autoManMemberUrl", url))
return err
}
var node *NodeModel
err = json.NewDecoder(resp.Body).Decode(&node)
if err != nil {
err = fmt.Errorf("could not deserialize response: %v - from node: %s", resp, el)
p.cluster.Logger().Error("Bad data from the node health status", slog.Any("error", err), slog.String("autoManMemberUrl", url))
return err
}
allNodes[idx] = node
return nil
})
}
// waits until all functions have returned
err := g.Wait()
var retNodes []*NodeModel
// clear out the nil ones
for _, node := range allNodes {
if node != nil {
retNodes = append(retNodes, node)
}
}
return retNodes, err
}
func (p *AutoManagedProvider) deregisterService() {
deregisteredMutex.Lock()
defer deregisteredMutex.Unlock()
p.deregistered = true
}
func (p *AutoManagedProvider) startActiveProvider() {
activeProviderRunningMutex.Lock()
running := p.activeProviderRunning
activeProviderRunningMutex.Unlock()
if !running {
if !p.activeProviderTesting {
p.activeProvider = echo.New()
p.activeProvider.HideBanner = true
p.activeProvider.GET("/_health", func(context echo.Context) error {
return context.JSON(http.StatusOK, p.getCurrentNode())
})
}
appURI := fmt.Sprintf("0.0.0.0:%d", p.autoManagePort)
go func() {
activeProviderRunningMutex.Lock()
p.activeProviderRunning = true
activeProviderRunningMutex.Unlock()
err := p.activeProvider.Start(appURI)
p.cluster.Logger().Error("Automanaged server stopping..!", slog.Any("error", err))
activeProviderRunningMutex.Lock()
p.activeProviderRunning = false
activeProviderRunningMutex.Unlock()
}()
}
}
func (p *AutoManagedProvider) stopActiveProvider() {
p.activeProvider.Close()
}
func (p *AutoManagedProvider) isShutdown() bool {
shutdownMutex.Lock()
defer shutdownMutex.Unlock()
return p.shutdown
}
func (p *AutoManagedProvider) isDeregistered() bool {
deregisteredMutex.Lock()
defer deregisteredMutex.Unlock()
return p.deregistered
}
func (p *AutoManagedProvider) isActiveProviderRunning() bool {
activeProviderRunningMutex.Lock()
defer activeProviderRunningMutex.Unlock()
return p.activeProviderRunning
}
func (p *AutoManagedProvider) getCurrentNode() *NodeModel {
return NewNode(p.clusterName, p.cluster.ActorSystem.ID, p.address, p.memberPort, p.autoManagePort, p.knownKinds)
}