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instance.go
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instance.go
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// Copyright (c) 2017-2023, R.I. Pienaar and the Choria Project contributors
//
// SPDX-License-Identifier: Apache-2.0
package server
import (
"context"
"fmt"
"sync"
"time"
"github.com/choria-io/go-choria/aagent"
"github.com/choria-io/go-choria/config"
"github.com/choria-io/go-choria/inter"
"github.com/choria-io/go-choria/providers/data"
"github.com/choria-io/go-choria/server/agents"
"github.com/choria-io/go-choria/server/discovery"
"github.com/choria-io/go-choria/server/registration"
"github.com/choria-io/go-choria/submission"
log "github.com/sirupsen/logrus"
)
// Instance is an independent copy of Choria
type Instance struct {
fw inter.Framework
connector inter.Connector
cfg *config.Config
log *log.Entry
registration *registration.Manager
agents *agents.Manager
discovery *discovery.Manager
provisioning bool
startTime time.Time
lastMsgProcessed time.Time
agentDenyList []string
lifecycleComponent string
machines *aagent.AAgent
data *data.Manager
requests chan inter.ConnectorMessage
shutdown func()
stopProcess func()
readyFunc func(context.Context)
mu *sync.Mutex
}
// NewInstance creates a new choria server instance
func NewInstance(fw inter.Framework) (i *Instance, err error) {
i = &Instance{
fw: fw,
cfg: fw.Configuration(),
requests: make(chan inter.ConnectorMessage, 10),
mu: &sync.Mutex{},
startTime: time.Now(),
lastMsgProcessed: time.Unix(0, 0),
agentDenyList: []string{},
}
i.log = fw.Logger("server").WithFields(log.Fields{"identity": i.cfg.Identity})
i.discovery = discovery.New(fw.Configuration(), i, fw.Logger("discovery"))
return i, nil
}
// Logger creates a new logger instance
func (srv *Instance) Logger(component string) *log.Entry {
return srv.fw.Logger(component)
}
// Shutdown signals to the server that it should shutdown
func (srv *Instance) Shutdown() error {
srv.mu.Lock()
defer srv.mu.Unlock()
if srv.shutdown == nil {
return fmt.Errorf("server is not running")
}
srv.shutdown()
return nil
}
// PrepareForShutdown stops processing incoming requests without shutting down the whole server
// the network connection is closed and no new messages or replies are handled but the server
// keeps running, this will allow for shutdowns and restarts without duplicate handling of messages
func (srv *Instance) PrepareForShutdown() error {
srv.mu.Lock()
defer srv.mu.Unlock()
if srv.stopProcess == nil {
return fmt.Errorf("server is not running")
}
srv.stopProcess()
return nil
}
// RunServiceHost sets up a instance that will only host service agents, for now separate, might combine later with Run
func (srv *Instance) RunServiceHost(ctx context.Context, wg *sync.WaitGroup) error {
defer wg.Done()
var sctx, pctx context.Context
srv.mu.Lock()
// server shutdown context
sctx, srv.shutdown = context.WithCancel(ctx)
// processing stop context
pctx, srv.stopProcess = context.WithCancel(sctx)
srv.mu.Unlock()
srv.log = srv.log.WithField("service_host", true)
srv.lifecycleComponent = "service_host"
err := srv.initialConnect(sctx)
if err != nil {
srv.log.Errorf("Initial Choria Broker connection failed: %s", err)
return fmt.Errorf("initial Choria Broker connection failed: %s", err)
}
wg.Add(1)
go srv.WriteServerStatus(sctx, wg)
srv.agents = agents.NewServices(srv.requests, srv.fw, srv.connector, srv, srv.log)
err = srv.setupAdditionalAgentProviders(sctx)
if err != nil {
srv.log.Errorf("Could not initialize initial additional agent providers: %s", err)
srv.connector.Close()
return fmt.Errorf("could not initialize initial additional agent providers: %s", err)
}
err = srv.setupAdditionalAgents(sctx)
if err != nil {
srv.log.Errorf("Could not initialize initial additional agents: %s", err)
srv.connector.Close()
return fmt.Errorf("could not initialize initial additional agents: %s", err)
}
srv.publishStartupEvent()
wg.Add(1)
go srv.publishAliveEvents(sctx, wg)
wg.Add(1)
go srv.processRequests(pctx, wg)
wg.Add(1)
go srv.triggerReadyFunc(ctx, wg)
return nil
}
func (srv *Instance) SetupSubmissions(ctx context.Context, wg *sync.WaitGroup) error {
if srv.cfg.Choria.SubmissionSpool == "" {
srv.log.Infof("Skipping submission startup as no spool is configured")
return nil
}
subm, err := submission.NewFromChoria(srv.fw, submission.Directory)
if err != nil {
return err
}
wg.Add(1)
go subm.Run(ctx, wg, srv.connector)
return nil
}
func (srv *Instance) Run(ctx context.Context, wg *sync.WaitGroup) error {
defer wg.Done()
var sctx, pctx context.Context
srv.mu.Lock()
// server shutdown context
sctx, srv.shutdown = context.WithCancel(ctx)
// processing stop context
pctx, srv.stopProcess = context.WithCancel(sctx)
srv.mu.Unlock()
err := srv.initialConnect(sctx)
if err != nil {
srv.log.Errorf("Initial Choria Broker connection failed: %s", err)
return fmt.Errorf("initial Choria Broker connection failed: %s", err)
}
wg.Add(1)
go srv.WriteServerStatus(sctx, wg)
srv.agents = agents.New(srv.requests, srv.fw, srv.connector, srv, srv.log)
srv.registration = registration.New(srv.fw, srv, srv.connector, srv.log)
for _, n := range srv.agentDenyList {
srv.agents.DenyAgent(n)
}
wg.Add(1)
err = srv.registration.Start(sctx, wg)
if err != nil {
srv.log.Errorf("Could not initialize registration: %s", err)
srv.connector.Close()
return fmt.Errorf("could not initialize registration: %s", err)
}
err = srv.setupAdditionalAgentProviders(sctx)
if err != nil {
srv.log.Errorf("Could not initialize initial additional agent providers: %s", err)
srv.connector.Close()
return fmt.Errorf("could not initialize initial additional agent providers: %s", err)
}
err = srv.setupAdditionalAgents(sctx)
if err != nil {
srv.log.Errorf("Could not initialize initial additional agents: %s", err)
srv.connector.Close()
return fmt.Errorf("could not initialize initial additional agents: %s", err)
}
err = srv.StartDataProviders(sctx)
if err != nil {
srv.log.Errorf("Could not start Choria Data Providers: %s", err)
}
err = srv.subscribeNode(sctx)
if err != nil {
srv.log.Errorf("Could not subscribe node: %s", err)
srv.connector.Close()
return fmt.Errorf("could not subscribe node: %s", err)
}
err = srv.SetupSubmissions(ctx, wg)
if err != nil {
srv.log.Errorf("Submission setup failed: %s", err)
}
srv.publishStartupEvent()
wg.Add(1)
go srv.publishAliveEvents(sctx, wg)
err = srv.StartMachine(sctx, wg)
if err != nil {
srv.log.Errorf("Could not start Choria Autonomous Agent host: %s", err)
}
wg.Add(1)
go srv.processRequests(pctx, wg)
wg.Add(1)
go srv.triggerReadyFunc(ctx, wg)
return nil
}
// RegisterRegistrationProvider adds a new provider for registration data to the registration subsystem
func (srv *Instance) RegisterRegistrationProvider(ctx context.Context, wg *sync.WaitGroup, provider registration.RegistrationDataProvider) error {
return srv.registration.RegisterProvider(ctx, wg, provider)
}
// AgentManager returns the agent manager for the instance
func (srv *Instance) AgentManager() *agents.Manager {
return srv.agents
}
// DenyAgent prevents an agent from being loaded, if it was already loaded this has no effect
func (srv *Instance) DenyAgent(agent string) {
srv.mu.Lock()
defer srv.mu.Unlock()
srv.agentDenyList = append(srv.agentDenyList, agent)
}
func (srv *Instance) triggerReadyFunc(ctx context.Context, wg *sync.WaitGroup) {
defer wg.Done()
if srv.readyFunc == nil || srv.fw.ProvisionMode() {
return
}
srv.log.Infof("Triggering ready function")
srv.readyFunc(ctx)
}
// RegisterReadyCallback registers a function that will be called once a fully provisioned instance is handling requests
//
// Ready functions must terminate when the context is canceled else server shutdown could be delayed
func (srv *Instance) RegisterReadyCallback(cb func(context.Context)) {
srv.mu.Lock()
srv.readyFunc = cb
srv.mu.Unlock()
}