passthrough

Documentation

Overview

Package passthrough provides a passthrough storage provider. This is intended to be used by nodes that don't host their own storage, but need to query the storage of other nodes.

Index

• type Consensus
  • func (p *Consensus) AddObserver(context.Context, *v1.StoragePeer) error
  • func (p *Consensus) AddVoter(context.Context, *v1.StoragePeer) error
  • func (p *Consensus) DemoteVoter(context.Context, *v1.StoragePeer) error
  • func (p *Consensus) GetLeader(context.Context) (*v1.StoragePeer, error)
  • func (p *Consensus) IsLeader() bool
  • func (p *Consensus) IsMember() bool
  • func (p *Consensus) RemovePeer(ctx context.Context, peer *v1.StoragePeer, wait bool) error
• type Options
• type Provider
  • func NewProvider(opts Options) *Provider
  • func (p *Provider) Bootstrap(ctx context.Context) error
  • func (p *Provider) Close() error
  • func (p *Provider) Consensus() storage.Consensus
  • func (p *Provider) ListenPort() uint16
  • func (p *Provider) MeshStorage() storage.MeshStorage
  • func (p *Provider) Start(ctx context.Context) error
  • func (p *Provider) Status() *v1.StorageStatus
• type Storage
  • func (p *Storage) Close() error
  • func (p *Storage) Delete(ctx context.Context, key string) error
  • func (p *Storage) GetValue(ctx context.Context, key string) (string, error)
  • func (p *Storage) IterPrefix(ctx context.Context, prefix string, fn storage.PrefixIterator) error
  • func (p *Storage) List(ctx context.Context, prefix string) ([]string, error)
  • func (p *Storage) PutValue(ctx context.Context, key, value string, ttl time.Duration) error
  • func (p *Storage) Subscribe(ctx context.Context, prefix string, fn storage.SubscribeFunc) (context.CancelFunc, error)

Types

type Consensus

type Consensus struct {
	*Provider
}

PassthroughConsensus is a consensus provider that returns an error for all write operations.

func (*Consensus) AddObserver

func (p *Consensus) AddObserver(context.Context, *v1.StoragePeer) error

AddObserver adds an observer to the consensus group.

func (*Consensus) AddVoter

func (p *Consensus) AddVoter(context.Context, *v1.StoragePeer) error

AddVoter adds a voter to the consensus group.

func (*Consensus) DemoteVoter

func (p *Consensus) DemoteVoter(context.Context, *v1.StoragePeer) error

DemoteVoter demotes a voter to an observer.

func (*Consensus) GetLeader

func (p *Consensus) GetLeader(context.Context) (*v1.StoragePeer, error)

GetLeader returns the leader of the storage group.

func (*Consensus) IsLeader

func (p *Consensus) IsLeader() bool

IsLeader returns true if the node is the leader of the storage group.

func (*Consensus) IsMember

func (p *Consensus) IsMember() bool

IsMember returns true if the node is a member of the storage group.

func (*Consensus) RemovePeer

func (p *Consensus) RemovePeer(ctx context.Context, peer *v1.StoragePeer, wait bool) error

RemovePeer removes a peer from the consensus group. If wait is true, the function will wait for the peer to be removed.

type Options

type Options struct {
	// Dialer is the dialer to use for connecting to other nodes.
	Dialer transport.NodeDialer
	// LogLevel is the log level to use.
	LogLevel string
}

Options are the passthrough options.

type Provider

type Provider struct {
	Options
	// contains filtered or unexported fields
}

Provider is a storage provider that passes through all storage operations to another node in the cluster.

func NewProvider

func NewProvider(opts Options) *Provider

NewProvider returns a new passthrough storage provider.

func (*Provider) Bootstrap

func (p *Provider) Bootstrap(ctx context.Context) error

func (*Provider) Close

func (p *Provider) Close() error

func (*Provider) Consensus

func (p *Provider) Consensus() storage.Consensus

func (*Provider) ListenPort

func (p *Provider) ListenPort() uint16

func (*Provider) MeshStorage

func (p *Provider) MeshStorage() storage.MeshStorage

func (*Provider) Start

func (p *Provider) Start(ctx context.Context) error

func (*Provider) Status

func (p *Provider) Status() *v1.StorageStatus

type Storage

type Storage struct {
	*Provider
}

func (*Storage) Close

func (p *Storage) Close() error

Close closes the storage.

func (*Storage) Delete

func (p *Storage) Delete(ctx context.Context, key string) error

Delete removes a key.

func (*Storage) GetValue

func (p *Storage) GetValue(ctx context.Context, key string) (string, error)

GetValue returns the value of a key.

func (*Storage) IterPrefix

func (p *Storage) IterPrefix(ctx context.Context, prefix string, fn storage.PrefixIterator) error

IterPrefix iterates over all keys with a given prefix. It is important that the iterator not attempt any write operations as this will cause a deadlock.

func (*Storage) List

func (p *Storage) List(ctx context.Context, prefix string) ([]string, error)

List returns all keys with a given prefix.

func (*Storage) PutValue

func (p *Storage) PutValue(ctx context.Context, key, value string, ttl time.Duration) error

PutValue sets the value of a key. TTL is optional and can be set to 0.

func (*Storage) Subscribe

func (p *Storage) Subscribe(ctx context.Context, prefix string, fn storage.SubscribeFunc) (context.CancelFunc, error)

Subscribe will call the given function whenever a key with the given prefix is changed. The returned function can be called to unsubscribe.