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137 lines
3.2 KiB
Go
137 lines
3.2 KiB
Go
package dqlite
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import (
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"time"
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"github.com/canonical/go-dqlite/client"
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"github.com/canonical/go-dqlite/internal/bindings"
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"github.com/pkg/errors"
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)
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// Node runs a dqlite node.
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type Node struct {
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log client.LogFunc // Logger
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server *bindings.Node // Low-level C implementation
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acceptCh chan error // Receives connection handling errors
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id uint64
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address string
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bindAddress string
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}
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// NodeInfo is a convenience alias for client.NodeInfo.
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type NodeInfo = client.NodeInfo
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// Option can be used to tweak node parameters.
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type Option func(*options)
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// WithDialFunc sets a custom dial function for the server.
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func WithDialFunc(dial client.DialFunc) Option {
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return func(options *options) {
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options.DialFunc = dial
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}
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}
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// WithBindAddress sets a custom bind address for the server.
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func WithBindAddress(address string) Option {
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return func(options *options) {
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options.BindAddress = address
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}
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}
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// WithNetworkLatency sets the average one-way network latency.
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func WithNetworkLatency(latency time.Duration) Option {
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return func(options *options) {
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options.NetworkLatency = uint64(latency.Nanoseconds())
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}
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}
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// New creates a new Node instance.
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func New(id uint64, address string, dir string, options ...Option) (*Node, error) {
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o := defaultOptions()
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for _, option := range options {
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option(o)
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}
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server, err := bindings.NewNode(id, address, dir)
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if err != nil {
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return nil, err
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}
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if o.DialFunc != nil {
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if err := server.SetDialFunc(o.DialFunc); err != nil {
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return nil, err
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}
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}
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if o.BindAddress != "" {
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if err := server.SetBindAddress(o.BindAddress); err != nil {
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return nil, err
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}
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}
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if o.NetworkLatency != 0 {
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if err := server.SetNetworkLatency(o.NetworkLatency); err != nil {
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return nil, err
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}
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}
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s := &Node{
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server: server,
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acceptCh: make(chan error, 1),
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id: id,
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address: address,
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bindAddress: o.BindAddress,
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}
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return s, nil
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}
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// BindAddress returns the network address the node is listening to.
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func (s *Node) BindAddress() string {
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return s.server.GetBindAddress()
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}
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// Start serving requests.
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func (s *Node) Start() error {
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return s.server.Start()
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}
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// Recover a node by forcing a new cluster configuration.
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func (s *Node) Recover(cluster []NodeInfo) error {
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return s.server.Recover(cluster)
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}
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// Hold configuration options for a dqlite server.
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type options struct {
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Log client.LogFunc
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DialFunc client.DialFunc
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BindAddress string
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NetworkLatency uint64
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}
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// Close the server, releasing all resources it created.
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func (s *Node) Close() error {
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// Send a stop signal to the dqlite event loop.
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if err := s.server.Stop(); err != nil {
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return errors.Wrap(err, "server failed to stop")
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}
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s.server.Close()
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return nil
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}
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// BootstrapID is a magic ID that should be used for the fist node in a
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// cluster. Alternatively ID 1 can be used as well.
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const BootstrapID = 0x2dc171858c3155be
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// GenerateID generates a unique ID for a new node, based on a hash of its
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// address and the current time.
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func GenerateID(address string) uint64 {
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return bindings.GenerateID(address)
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}
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// Create a options object with sane defaults.
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func defaultOptions() *options {
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return &options{
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DialFunc: client.DefaultDialFunc,
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}
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}
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