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endpoint.go
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endpoint.go
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// Copyright (c) DataStax, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package proxycore
import (
"crypto/tls"
"errors"
"fmt"
"math/rand"
"net"
"strconv"
)
type Endpoint interface {
fmt.Stringer
Addr() string
IsResolved() bool
TlsConfig() *tls.Config
Key() string
}
type defaultEndpoint struct {
addr string
}
func (e defaultEndpoint) String() string {
return e.Key()
}
func (e defaultEndpoint) Key() string {
return e.addr
}
func (e defaultEndpoint) IsResolved() bool {
return true
}
func (e defaultEndpoint) Addr() string {
return e.addr
}
func (e defaultEndpoint) TlsConfig() *tls.Config {
return nil
}
type EndpointResolver interface {
Resolve() ([]Endpoint, error)
NewEndpoint(row Row) (Endpoint, error)
}
type defaultEndpointResolver struct {
contactPoints []string
defaultPort string
}
func NewEndpoint(addr string) Endpoint {
return &defaultEndpoint{addr}
}
func NewResolver(contactPoints ...string) EndpointResolver {
return NewResolverWithDefaultPort(contactPoints, 9042)
}
func NewResolverWithDefaultPort(contactPoints []string, defaultPort int) EndpointResolver {
return &defaultEndpointResolver{
contactPoints: contactPoints,
defaultPort: strconv.Itoa(defaultPort),
}
}
func (r *defaultEndpointResolver) Resolve() ([]Endpoint, error) {
var endpoints []Endpoint
for _, cp := range r.contactPoints {
host, port, err := net.SplitHostPort(cp)
if err != nil {
host = cp
}
addrs, err := net.LookupHost(host)
if err != nil {
return nil, fmt.Errorf("unable to resolve contact point %s: %v", cp, err)
}
if len(port) == 0 {
port = r.defaultPort
}
for _, addr := range addrs {
endpoints = append(endpoints, &defaultEndpoint{
net.JoinHostPort(addr, port),
})
}
}
return endpoints, nil
}
func (r *defaultEndpointResolver) NewEndpoint(row Row) (Endpoint, error) {
peer, err := row.ByName("peer")
if err != nil && !errors.Is(err, ColumnNameNotFound) {
return nil, err
}
rpcAddress, err := row.ByName("rpc_address")
if err != nil {
return nil, err
}
var ok bool
var addr net.IP
if addr, ok = rpcAddress.(net.IP); !ok {
return nil, errors.New("ignoring host because its `rpc_address` is not set or is invalid")
}
if addr.Equal(net.IPv4zero) || addr.Equal(net.IPv6zero) {
if addr, ok = peer.(net.IP); !ok {
return nil, errors.New("ignoring host because its `peer` is not set or is invalid")
}
}
return &defaultEndpoint{
addr: net.JoinHostPort(addr.String(), r.defaultPort),
}, nil
}
func LookupEndpoint(endpoint Endpoint) (string, error) {
if endpoint.IsResolved() {
return endpoint.Addr(), nil
} else {
host, port, err := net.SplitHostPort(endpoint.Addr())
if err != nil {
return "'", err
}
addrs, err := net.LookupHost(host)
if err != nil {
return "", err
}
addr := addrs[rand.Intn(len(addrs))]
if len(port) > 0 {
addr = net.JoinHostPort(addr, port)
}
return addr, nil
}
}