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groupservice_hook.go
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groupservice_hook.go
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package allocrunner
import (
"sync"
"time"
log "github.com/hashicorp/go-hclog"
"github.com/hashicorp/nomad/client/allocrunner/interfaces"
"github.com/hashicorp/nomad/client/consul"
"github.com/hashicorp/nomad/client/taskenv"
agentconsul "github.com/hashicorp/nomad/command/agent/consul"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/hashicorp/nomad/plugins/drivers"
)
// groupServiceHook manages task group Consul service registration and
// deregistration.
type groupServiceHook struct {
allocID string
group string
restarter agentconsul.WorkloadRestarter
consulClient consul.ConsulServiceAPI
prerun bool
delay time.Duration
deregistered bool
logger log.Logger
// The following fields may be updated
canary bool
services []*structs.Service
networks structs.Networks
taskEnvBuilder *taskenv.Builder
// Since Update() may be called concurrently with any other hook all
// hook methods must be fully serialized
mu sync.Mutex
}
type groupServiceHookConfig struct {
alloc *structs.Allocation
consul consul.ConsulServiceAPI
restarter agentconsul.WorkloadRestarter
taskEnvBuilder *taskenv.Builder
logger log.Logger
}
func newGroupServiceHook(cfg groupServiceHookConfig) *groupServiceHook {
var shutdownDelay time.Duration
tg := cfg.alloc.Job.LookupTaskGroup(cfg.alloc.TaskGroup)
if tg.ShutdownDelay != nil {
shutdownDelay = *tg.ShutdownDelay
}
h := &groupServiceHook{
allocID: cfg.alloc.ID,
group: cfg.alloc.TaskGroup,
restarter: cfg.restarter,
consulClient: cfg.consul,
taskEnvBuilder: cfg.taskEnvBuilder,
delay: shutdownDelay,
}
h.logger = cfg.logger.Named(h.Name())
h.services = cfg.alloc.Job.LookupTaskGroup(h.group).Services
if cfg.alloc.AllocatedResources != nil {
h.networks = cfg.alloc.AllocatedResources.Shared.Networks
}
if cfg.alloc.DeploymentStatus != nil {
h.canary = cfg.alloc.DeploymentStatus.Canary
}
return h
}
func (*groupServiceHook) Name() string {
return "group_services"
}
func (h *groupServiceHook) Prerun() error {
h.mu.Lock()
defer func() {
// Mark prerun as true to unblock Updates
h.prerun = true
h.mu.Unlock()
}()
if len(h.services) == 0 {
return nil
}
services := h.getWorkloadServices()
return h.consulClient.RegisterWorkload(services)
}
func (h *groupServiceHook) Update(req *interfaces.RunnerUpdateRequest) error {
h.mu.Lock()
defer h.mu.Unlock()
oldWorkloadServices := h.getWorkloadServices()
// Store new updated values out of request
canary := false
if req.Alloc.DeploymentStatus != nil {
canary = req.Alloc.DeploymentStatus.Canary
}
var networks structs.Networks
if req.Alloc.AllocatedResources != nil {
networks = req.Alloc.AllocatedResources.Shared.Networks
}
// Update group service hook fields
h.networks = networks
h.services = req.Alloc.Job.LookupTaskGroup(h.group).Services
h.canary = canary
h.taskEnvBuilder.UpdateTask(req.Alloc, nil)
// Create new task services struct with those new values
newWorkloadServices := h.getWorkloadServices()
if !h.prerun {
// Update called before Prerun. Update alloc and exit to allow
// Prerun to do initial registration.
return nil
}
return h.consulClient.UpdateWorkload(oldWorkloadServices, newWorkloadServices)
}
func (h *groupServiceHook) PreKill() {
h.mu.Lock()
defer h.mu.Unlock()
// If we have a shutdown delay deregister
// group services and then wait
// before continuing to kill tasks
h.deregister()
h.deregistered = true
if h.delay == 0 {
return
}
h.logger.Debug("waiting before removing group service", "shutdown_delay", h.delay)
// Wait for specified shutdown_delay
// this will block an agent from shutting down
<-time.After(h.delay)
}
func (h *groupServiceHook) Postrun() error {
h.mu.Lock()
defer h.mu.Unlock()
if !h.deregistered {
h.deregister()
}
return nil
}
func (h *groupServiceHook) driverNet() *drivers.DriverNetwork {
if len(h.networks) == 0 {
return nil
}
//TODO(schmichael) only support one network for now
net := h.networks[0]
//TODO(schmichael) there's probably a better way than hacking driver network
return &drivers.DriverNetwork{
AutoAdvertise: true,
IP: net.IP,
// Copy PortLabels from group network
PortMap: net.PortLabels(),
}
}
// deregister services from Consul.
func (h *groupServiceHook) deregister() {
if len(h.services) > 0 {
workloadServices := h.getWorkloadServices()
h.consulClient.RemoveWorkload(workloadServices)
// Canary flag may be getting flipped when the alloc is being
// destroyed, so remove both variations of the service
workloadServices.Canary = !workloadServices.Canary
h.consulClient.RemoveWorkload(workloadServices)
}
}
func (h *groupServiceHook) getWorkloadServices() *agentconsul.WorkloadServices {
// Interpolate with the task's environment
interpolatedServices := taskenv.InterpolateServices(h.taskEnvBuilder.Build(), h.services)
// Create task services struct with request's driver metadata
return &agentconsul.WorkloadServices{
AllocID: h.allocID,
Group: h.group,
Restarter: h.restarter,
Services: interpolatedServices,
DriverNetwork: h.driverNet(),
Networks: h.networks,
Canary: h.canary,
}
}