package scale
import (
"time"
"github.com/leveros/leveros/config"
"github.com/leveros/leveros/leverutil"
"google.golang.org/grpc"
)
var (
// GRPCUnusedTimeoutFlag is the time a connection is dropped after it has
// been last used.
GRPCUnusedTimeoutFlag = config.DeclareDuration(
PackageName, "grpcUnusedTimeout", 5*time.Minute)
)
// GRPCPool represents a pool of GRPC client connections.
type GRPCPool struct {
conns *leverutil.Cache
}
// NewGRPCPool returns a new GRPC connection pool.
func NewGRPCPool() (*GRPCPool, error) {
expiry := GRPCUnusedTimeoutFlag.Get()
pool := new(GRPCPool)
pool.conns = leverutil.NewCache(
expiry,
func(addr string) (interface{}, error) {
return grpc.Dial(addr, grpc.WithInsecure())
},
import (
"fmt"
"sync"
"time"
dockerapi "github.com/fsouza/go-dockerclient"
"github.com/leveros/leveros/config"
"github.com/leveros/leveros/dockerutil"
"github.com/leveros/leveros/leverutil"
"github.com/leveros/leveros/scale"
)
var (
// InstanceExpiryTimeFlag is the expiry time after its last use after which
// a instance instance is evicted from the host.
InstanceExpiryTimeFlag = config.DeclareDuration(
PackageName, "instanceExpiryTime", 5*time.Minute)
)
// OnCloseFun is a function that is called when an instance or a resource is
// closed.
type OnCloseFun func(identifier string, err error)
// LeverInstance represents a Lever instance running on a Lever
// host. It takes care of monitoring the Docker container and the Consul lock
// associated with the instance and manages the instance's lifecycle. It also
// keeps track of the resources hosted on it and sends them keep alive's where
// appropriate.
type LeverInstance struct {
leverEnv string
leverService string
instanceID string
"net" "strings" "sync" "time" "github.com/leveros/leveros/config" "github.com/leveros/leveros/hostman" "github.com/leveros/leveros/http2stream" "github.com/leveros/leveros/leverutil" "github.com/leveros/leveros/scale" ) var ( // ConnectionExpiryFlag is the inactivity time after which client // connections are closed. ConnectionExpiryFlag = config.DeclareDuration( PackageName, "connectionExpiry", 5*time.Minute) // ConnectionConnectTimeoutFlag is the timeout for client connections to // establish. ConnectionConnectTimeoutFlag = config.DeclareDuration( PackageName, "connectionConnectTimeout", 20*time.Second) // DisableProxyExtFlag enables listening to the external interface // (regional LB). DisableProxyExtFlag = config.DeclareBool( PackageName, "disableProxyExt") // DisableProxyInOutFlag enables listening to requests going to or coming // from a local environment. DisableProxyInOutFlag = config.DeclareBool( PackageName, "disableProxyInOut") // EnvOutListenPortFlag is the environment listen port for outward
consulapi "github.com/hashicorp/consul/api"
"github.com/leveros/leveros/config"
"github.com/leveros/leveros/leverutil"
"github.com/leveros/leveros/scale"
)
var trackerLogger = leverutil.GetLogger(PackageName, "loadtracker")
var (
// TickNumEventsFlag is the number of events that the load tracker aims to
// put in a tick length. Yet, due to {Min,Max}TickPeriodFlag, the number of
// events may vary.
TickNumEventsFlag = config.DeclareInt(PackageName, "tickNumEvents", 16)
// MinTickPeriodFlag is the minimum time between load tracker ticks.
MinTickPeriodFlag = config.DeclareDuration(
PackageName, "minTickPeriod", 250*time.Millisecond)
// MaxTickPeriodFlag is the maximum time between load tracker
// ticks. Note: The period may still be longer than this if no events at all
// come up for a while.
MaxTickPeriodFlag = config.DeclareDuration(
PackageName, "maxTickPeriod", 15*time.Second)
// StatsExpPeriodFlag is the amount of time stats are taken into
// consideration. This value is used for the computation of alpha in EWMA.
StatsExpPeriodFlag = config.DeclareDuration(
PackageName, "statsExpPeriod", 15*time.Second)
// ScaleDownAfterFlag is the amount of time to delay scaling down (just
// in case resource requirements pop back up).
ScaleDownAfterFlag = config.DeclareDuration(
PackageName, "scaleDownAfter", 45*time.Second)
// ChangesExpectedAfterFlag is the maxium amount of time a change in number
// of instances is expected to be reflected in Consul. (Otherwise
var logger = leverutil.GetLogger(PackageName, "fleettracker")
// FleetTrackerService is the name of the fleettracker internal service.
const FleetTrackerService = "fleettracker"
var (
// InstanceIDFlag is the instance ID of the fleettracker. Note: This is a
// different instance ID than leverutil.InstanceIDFlag because they serve
// different things.
InstanceIDFlag = config.DeclareString(
PackageName, "instanceID", leverutil.RandomID())
// TTLFlag is the time after a service expires in fleettracker. If no RPC
// event comes up during this span of time for a Lever service, fleettracker
// stops keeping track of its stats (it is assumed all its instances
// have expired anyway).
TTLFlag = config.DeclareDuration(PackageName, "ttl", 20*time.Minute)
)
// FleetTracker ensures that each Lever service has the right number of
// instances in its fleet. It spins up or kills instances as necessary.
type FleetTracker struct {
grpcPool *scale.GRPCPool
docker *dockerapi.Client
serviceSKA *scale.SelfKeepAlive
// Guard the following.
lock sync.RWMutex
// servingID -> servingTracker
services map[string]*LoadTracker
}
"time"
aerospike "github.com/aerospike/aerospike-client-go"
dockerapi "github.com/fsouza/go-dockerclient"
"github.com/leveros/leveros/config"
"github.com/leveros/leveros/core"
"github.com/leveros/leveros/dockerutil"
"github.com/leveros/leveros/hostman"
"github.com/leveros/leveros/leverutil"
"github.com/leveros/leveros/scale"
"github.com/leveros/leveros/store"
)
var (
// InstanceConstructTimeoutFlag is the deadline for an instance to spin up.
InstanceConstructTimeoutFlag = config.DeclareDuration(
PackageName, "instanceConstructTimeout", 15*time.Second)
// ResourceConstructTimeoutFlag is the deadline for a resource to get
// allocated (the time necessary might include spinning up an instance).
ResourceConstructTimeoutFlag = config.DeclareDuration(
PackageName, "resourceConstructTimeout", 20*time.Second)
)
// LeverHostInfo is the information returned by a call to GetHost.
type LeverHostInfo struct {
HostAddr string
// May be "" if instance was found via DNS.
InstanceID string
// May be "" if instance was found via DNS.
ContainerID string
ServingID string
CodeVersion int64
import (
"fmt"
"sync"
"time"
"github.com/leveros/leveros/config"
"github.com/leveros/leveros/core"
"github.com/leveros/leveros/leverutil"
"github.com/leveros/leveros/scale"
"golang.org/x/net/context"
)
var (
// ResourceExpiryTimeFlag is the expiry time after its last use after which
// a resource is evicted from the host.
ResourceExpiryTimeFlag = config.DeclareDuration(
PackageName, "resourceExpiryTime", 3*time.Minute)
)
// LeverResource represents an instance of a Lever resource within a Lever
// service, that is hosted on a Lever instance. It takes care of monitoring the
// Consul lock associated with the resource and manages the resource's
// lifecycle.
type LeverResource struct {
leverEnv string
leverService string
leverResource string
instanceAddr string
levResResource *scale.Resource
conns *scale.GRPCPool
sessionKAB *scale.KeepAliveBuffer
expiryTimer *time.Timer