6004e599ed
* feat: add dep configuration files. * chore: add vendor folder. * refactor: update Dockerfile. * review: remove git from Dockerfile. * review: remove RUN apk. * review: dep status. * feat: added .dockerignore
67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
package memcache
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import (
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"hash/crc32"
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"net"
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"strings"
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)
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// Servers is the interface used to manage a set of memcached
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// servers.
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//
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// Implementations must be safely accessible from multiple
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// goroutines.
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type Servers interface {
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// PickServer selects one server from the ones by
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// managed by the Servers instance, based on the
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// given key.
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PickServer(key string) (*Addr, error)
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// Servers returns all the servers managed by the
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// Servers instance.
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Servers() ([]*Addr, error)
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}
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// ServerList is an implementation of the Servers interface.
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// To initialize a ServerList use NewServerList.
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type ServerList struct {
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addrs []*Addr
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}
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// NewServerList returns a new ServerList with the given servers.
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// All servers have the same weight. To give a server more weight,
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// list it multiple times.
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//
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// NewServerList returns an error if any of the received addresses
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// is not valid or fails to resolve, but it doesn't try to connect
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// to the provided servers.
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func NewServerList(servers ...string) (*ServerList, error) {
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addrs := make([]*Addr, len(servers))
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for i, server := range servers {
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if strings.Contains(server, "/") {
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addr, err := net.ResolveUnixAddr("unix", server)
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if err != nil {
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return nil, err
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}
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addrs[i] = NewAddr(addr)
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} else {
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tcpaddr, err := net.ResolveTCPAddr("tcp", server)
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if err != nil {
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return nil, err
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}
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addrs[i] = NewAddr(tcpaddr)
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}
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}
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return &ServerList{addrs: addrs}, nil
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}
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func (s *ServerList) PickServer(key string) (*Addr, error) {
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if len(s.addrs) == 0 {
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return nil, ErrNoServers
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}
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cs := crc32.ChecksumIEEE(stobs(key))
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return s.addrs[cs%uint32(len(s.addrs))], nil
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}
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func (s *ServerList) Servers() ([]*Addr, error) {
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return s.addrs, nil
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}
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