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client.go
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client.go
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package riak
import (
"fmt"
"strconv"
"strings"
)
const ErrClientInvalidRemoteAddress = "[Client] invalid RemoteAddress '%s'"
var (
ErrClientOptionsRequired = newClientError("[Client] options are required", nil)
ErrClientMissingRequiredData = newClientError("[Client] options must specify either a Cluster or a set of RemoteAddresses", nil)
)
// Client object contains your cluster object
type Client struct {
cluster *Cluster
}
// Options for creating a new Client. Either Cluster or Port/RemoteAddress information must be provided
type NewClientOptions struct {
Cluster *Cluster
Port uint16 // NB: if specified, all connections will use this value if port is not provided
RemoteAddresses []string // NB: in the form HOST|IP[:PORT]
}
// NewClient generates a new Client object using the provided options
func NewClient(opts *NewClientOptions) (*Client, error) {
if opts == nil {
return nil, ErrClientOptionsRequired
}
if opts.Cluster != nil {
return newClientUsingCluster(opts.Cluster)
}
if opts.RemoteAddresses != nil {
return newClientUsingAddresses(opts.Port, opts.RemoteAddresses)
}
return nil, ErrClientMissingRequiredData
}
func (c *Client) Cluster() *Cluster {
return c.cluster
}
// Execute (synchronously) the provided Command against the cluster
func (c *Client) Execute(cmd Command) error {
return c.cluster.Execute(cmd)
}
// Execute (asynchronously) the provided Command against the cluster
func (c *Client) ExecuteAsync(a *Async) error {
return c.cluster.ExecuteAsync(a)
}
// Pings the cluster
func (c *Client) Ping() (bool, error) {
cmd := &PingCommand{}
err := c.cluster.Execute(cmd)
return cmd.Success(), err
}
// Stop the nodes in the cluster and the cluster itself
func (c *Client) Stop() error {
return c.cluster.Stop()
}
func newClientUsingCluster(cluster *Cluster) (*Client, error) {
if err := cluster.Start(); err != nil {
return nil, err
}
return &Client{
cluster: cluster,
}, nil
}
func newClientUsingAddresses(port uint16, remoteAddresses []string) (*Client, error) {
if len(remoteAddresses) == 0 {
remoteAddresses = make([]string, 1)
remoteAddresses[0] = defaultRemoteAddress
}
nodes := make([]*Node, len(remoteAddresses))
for i, ra := range remoteAddresses {
nopts := &NodeOptions{
MinConnections: 10,
}
s := strings.SplitN(ra, ":", 2)
switch len(s) {
case 0:
return nil, newClientError(fmt.Sprintf(ErrClientInvalidRemoteAddress, ra), nil)
case 1:
if port > 0 {
nopts.RemoteAddress = fmt.Sprintf("%s:%d", s[0], port)
} else {
nopts.RemoteAddress = fmt.Sprintf("%s:%d", s[0], defaultRemotePort)
}
case 2:
if p, err := strconv.Atoi(s[1]); err != nil {
return nil, newClientError(ErrClientInvalidRemoteAddress, err)
} else {
nopts.RemoteAddress = fmt.Sprintf("%s:%d", s[0], p)
}
default:
return nil, newClientError(fmt.Sprintf(ErrClientInvalidRemoteAddress, ra), nil)
}
if node, err := NewNode(nopts); err != nil {
return nil, err
} else {
nodes[i] = node
}
}
copts := &ClusterOptions{
Nodes: nodes,
}
if cluster, err := NewCluster(copts); err != nil {
return nil, err
} else {
return newClientUsingCluster(cluster)
}
}