kontrol

package
v0.0.0-...-7c6dff7 Latest Latest
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 Go to latest Published: Jan 6, 2015 License: MIT Imports: 24 Imported by: 0

Documentation

Overview

Package kontrol provides an implementation for the name service kite. It can be queried to get the list of running kites.

Index

Constants

View Source 
const (
	KontrolVersion = "0.0.4"
	KitesPrefix    = "/kites"
	TokenLeeway    = 1 * time.Minute
)

Variables

View Source 
var (
	TokenTTL    = 48 * time.Hour
	DefaultPort = 4000

	// HeartbeatInterval is the interval in which kites are sending heartbeats
	HeartbeatInterval = time.Second * 10

	// HeartbeatDelay is the compensation interval which is added to the
	// heartbeat to avoid network delays
	HeartbeatDelay = time.Second * 20

	// UpdateInterval is the interval in which the key gets updated
	// periodically. Keeping it low increase the write load to the storage, so
	// be cautious when changing it.
	UpdateInterval = time.Second * 60

	// KeyTLL is the timeout in which a key expires. Each storage
	// implementation needs to set keys according to this Key. If a storage
	// doesn't support TTL mechanism (such as PostgreSQL), it should use a
	// background cleaner which cleans up keys that are KeyTTL old.
	KeyTTL = time.Second * 90
)

Functions

func GetQueryKey 

func GetQueryKey(q *protocol.KontrolQuery) (string, error)

getQueryKey returns the etcd key for the query.

Types

type Etcd 

type Etcd struct {
	// contains filtered or unexported fields
}

Etcd implements the Storage interface

func NewEtcd 

func NewEtcd(machines []string, log kite.Logger) *Etcd

func (*Etcd) Add 

func (e *Etcd) Add(k *protocol.Kite, value *kontrolprotocol.RegisterValue) error

func (*Etcd) Clear 

func (e *Etcd) Clear() error

func (*Etcd) Delete 

func (e *Etcd) Delete(k *protocol.Kite) error

func (*Etcd) Get 

func (e *Etcd) Get(query *protocol.KontrolQuery) (Kites, error)

func (*Etcd) Update 

func (e *Etcd) Update(k *protocol.Kite, value *kontrolprotocol.RegisterValue) error

func (*Etcd) Upsert 

func (e *Etcd) Upsert(k *protocol.Kite, value *kontrolprotocol.RegisterValue) error

type IdLock 

type IdLock struct {
	// contains filtered or unexported fields
}

func NewIdlock 

func NewIdlock() *IdLock

New returns a new IdLock

func (*IdLock) Get 

func (i *IdLock) Get(id string) sync.Locker

Get returns a lock that is bound to a specific id.

type Kites 

type Kites []*protocol.KiteWithToken

Kites is a helpe type to work with a set of kites

func (Kites) Attach 

func (k Kites) Attach(token string)

Attach attaches the given token to each kite. It replaces any previous token.

func (Kites) Filter 

func (k Kites) Filter(constraint version.Constraints, keyRest string)

Filter filters out kites with the given constraints

func (Kites) Shuffle 

func (k Kites) Shuffle()

Shuffle shuffles the order of the kites. This is usefull if you want send back a randomized list of kites.

type Kontrol 

type Kontrol struct {
	Kite *kite.Kite

	// MachineAuthenticate is used to authenticate the request in the
	// "handleMachine" method.  The reason for a separate auth function is, the
	// request must not be authenticated because clients do not have a kite.key
	// before they register to this machine.
	MachineAuthenticate func(r *kite.Request) error

	// RegisterURL defines the URL that is used to self register when adding
	// itself to the storage backend
	RegisterURL string
	// contains filtered or unexported fields
}

func New 

func New(conf *config.Config, version, publicKey, privateKey string) *Kontrol

New creates a new kontrol instance with the given version and config instance. Publickey is used for validating tokens and privateKey is used for signing tokens.

Public and private keys are RSA pem blocks that can be generated with the following command: 

openssl genrsa -out testkey.pem 2048
openssl rsa -in testkey.pem -pubout > testkey_pub.pem

func (*Kontrol) AddAuthenticator 

func (k *Kontrol) AddAuthenticator(keyType string, fn func(*kite.Request) error)

func (*Kontrol) Close 

func (k *Kontrol) Close()

Close stops kontrol and closes all connections

func (*Kontrol) InitializeSelf 

func (k *Kontrol) InitializeSelf() error

InitializeSelf registers his host by writing a key to ~/.kite/kite.key

func (*Kontrol) Run 

func (k *Kontrol) Run()

func (*Kontrol) SetStorage 

func (k *Kontrol) SetStorage(storage Storage)

SetStorage sets the backend storage that kontrol is going to use to store kites

type Node 

type Node struct {
	Node *etcd.Node
}

Node is a wrapper around an etcd node to provide additional functionality around kites.

func NewNode 

func NewNode(node *etcd.Node) *Node

New returns a new initialized node with the given etcd node.

func (*Node) Flatten 

func (n *Node) Flatten() []*Node

Flatten converts the recursive etcd directory structure to a flat one that contains all kontrolNodes

func (*Node) HasValue 

func (n *Node) HasValue() bool

HasValue returns true if the give node has a non-empty value

func (*Node) Kite 

func (n *Node) Kite() (*protocol.KiteWithToken, error)

Kite returns a single kite gathered from the key and the value for the current node.

func (*Node) KiteFromKey 

func (n *Node) KiteFromKey() (*protocol.Kite, error)

KiteFromKey returns a *protocol.Kite from an etcd key. etcd key is like: "/kites/devrim/env/mathworker/1/localhost/tardis.local/id"

func (*Node) Kites 

func (n *Node) Kites() (Kites, error)

Kites returns a list of kites that are gathered by collecting recursively all nodes under the current node.

func (*Node) Value 

func (n *Node) Value() (string, error)

Value returns the value associated with the current node.

type Postgres 

type Postgres struct {
	DB  *sql.DB
	Log kite.Logger
}

func NewPostgres 

func NewPostgres(conf *PostgresConfig, log kite.Logger) *Postgres

func (*Postgres) Add 

func (p *Postgres) Add(kiteProt *protocol.Kite, value *kontrolprotocol.RegisterValue) error

func (*Postgres) CleanExpiredRows 

func (p *Postgres) CleanExpiredRows(expire time.Duration) (int64, error)

CleanExpiredRows deletes rows that are at least "expire" duration old. So if say an expire duration of 10 second is given, it will delete all rows that were updated 10 seconds ago

func (*Postgres) Delete 

func (p *Postgres) Delete(kiteProt *protocol.Kite) error

func (*Postgres) Get 

func (p *Postgres) Get(query *protocol.KontrolQuery) (Kites, error)

func (*Postgres) RunCleaner 

func (p *Postgres) RunCleaner(interval, expire time.Duration)

RunCleaner deletes every "interval" duration rows which are older than "expire" duration based on the "updated_at" field. For more info check CleanExpireRows which is used to delete old rows.

func (*Postgres) Update 

func (p *Postgres) Update(kiteProt *protocol.Kite, value *kontrolprotocol.RegisterValue) error

func (*Postgres) Upsert 

func (p *Postgres) Upsert(kiteProt *protocol.Kite, value *kontrolprotocol.RegisterValue) (err error)

type PostgresConfig 

type PostgresConfig struct {
	Host     string `default:"localhost"`
	Port     int    `default:"5432"`
	Username string `required:"true"`
	Password string
	DBName   string `required:"true" `
}

Postgres holds Postgresql database related configuration

type RegisterValue 

type RegisterValue struct {
	URL string `json:"url"`
}

RegisterValue is the type of the value that is saved to etcd.

type Storage 

type Storage interface {
	// Get retrieves the Kites with the given query
	Get(query *protocol.KontrolQuery) (Kites, error)

	// Add inserts the given kite with the given value
	Add(kite *protocol.Kite, value *kontrolprotocol.RegisterValue) error

	// Update updates the value for the given kite
	Update(kite *protocol.Kite, value *kontrolprotocol.RegisterValue) error

	// Delete deletes the given kite from the storage
	Delete(kite *protocol.Kite) error

	// Upsert inserts or updates the value for the given kite
	Upsert(kite *protocol.Kite, value *kontrolprotocol.RegisterValue) error
}

Storage is an interface to a kite storage. A storage should be safe to concurrent access.

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