Remove golang vendored directory (#18277)

* rm go vendor

* fix drone yaml

* add to gitignore

3 files changed, 0 insertions, 1049 deletions

diff --git a/vendor/github.com/bradfitz/gomemcache/LICENSE b/vendor/github.com/bradfitz/gomemcache/LICENSE
deleted file mode 100644
index d645695673..0000000000
--- a/vendor/github.com/bradfitz/gomemcache/LICENSE
+++ /dev/null
@@ -1,202 +0,0 @@
-
-                                 Apache License
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-                        http://www.apache.org/licenses/
-
-   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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diff --git a/vendor/github.com/bradfitz/gomemcache/memcache/memcache.go b/vendor/github.com/bradfitz/gomemcache/memcache/memcache.go
deleted file mode 100644
index 545a3e7958..0000000000
--- a/vendor/github.com/bradfitz/gomemcache/memcache/memcache.go
+++ /dev/null
@@ -1,718 +0,0 @@
-/*
-Copyright 2011 Google 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 memcache provides a client for the memcached cache server.
-package memcache
-
-import (
-	"bufio"
-	"bytes"
-	"errors"
-	"fmt"
-	"io"
-	"net"
-
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-)
-
-// Similar to:
-// https://godoc.org/google.golang.org/appengine/memcache
-
-var (
-	// ErrCacheMiss means that a Get failed because the item wasn't present.
-	ErrCacheMiss = errors.New("memcache: cache miss")
-
-	// ErrCASConflict means that a CompareAndSwap call failed due to the
-	// cached value being modified between the Get and the CompareAndSwap.
-	// If the cached value was simply evicted rather than replaced,
-	// ErrNotStored will be returned instead.
-	ErrCASConflict = errors.New("memcache: compare-and-swap conflict")
-
-	// ErrNotStored means that a conditional write operation (i.e. Add or
-	// CompareAndSwap) failed because the condition was not satisfied.
-	ErrNotStored = errors.New("memcache: item not stored")
-
-	// ErrServer means that a server error occurred.
-	ErrServerError = errors.New("memcache: server error")
-
-	// ErrNoStats means that no statistics were available.
-	ErrNoStats = errors.New("memcache: no statistics available")
-
-	// ErrMalformedKey is returned when an invalid key is used.
-	// Keys must be at maximum 250 bytes long and not
-	// contain whitespace or control characters.
-	ErrMalformedKey = errors.New("malformed: key is too long or contains invalid characters")
-
-	// ErrNoServers is returned when no servers are configured or available.
-	ErrNoServers = errors.New("memcache: no servers configured or available")
-)
-
-const (
-	// DefaultTimeout is the default socket read/write timeout.
-	DefaultTimeout = 100 * time.Millisecond
-
-	// DefaultMaxIdleConns is the default maximum number of idle connections
-	// kept for any single address.
-	DefaultMaxIdleConns = 2
-)
-
-const buffered = 8 // arbitrary buffered channel size, for readability
-
-// resumableError returns true if err is only a protocol-level cache error.
-// This is used to determine whether or not a server connection should
-// be re-used or not. If an error occurs, by default we don't reuse the
-// connection, unless it was just a cache error.
-func resumableError(err error) bool {
-	switch err {
-	case ErrCacheMiss, ErrCASConflict, ErrNotStored, ErrMalformedKey:
-		return true
-	}
-	return false
-}
-
-func legalKey(key string) bool {
-	if len(key) > 250 {
-		return false
-	}
-	for i := 0; i < len(key); i++ {
-		if key[i] <= ' ' || key[i] == 0x7f {
-			return false
-		}
-	}
-	return true
-}
-
-var (
-	crlf            = []byte("\r\n")
-	space           = []byte(" ")
-	resultOK        = []byte("OK\r\n")
-	resultStored    = []byte("STORED\r\n")
-	resultNotStored = []byte("NOT_STORED\r\n")
-	resultExists    = []byte("EXISTS\r\n")
-	resultNotFound  = []byte("NOT_FOUND\r\n")
-	resultDeleted   = []byte("DELETED\r\n")
-	resultEnd       = []byte("END\r\n")
-	resultOk        = []byte("OK\r\n")
-	resultTouched   = []byte("TOUCHED\r\n")
-
-	resultClientErrorPrefix = []byte("CLIENT_ERROR ")
-	versionPrefix           = []byte("VERSION")
-)
-
-// New returns a memcache client using the provided server(s)
-// with equal weight. If a server is listed multiple times,
-// it gets a proportional amount of weight.
-func New(server ...string) *Client {
-	ss := new(ServerList)
-	ss.SetServers(server...)
-	return NewFromSelector(ss)
-}
-
-// NewFromSelector returns a new Client using the provided ServerSelector.
-func NewFromSelector(ss ServerSelector) *Client {
-	return &Client{selector: ss}
-}
-
-// Client is a memcache client.
-// It is safe for unlocked use by multiple concurrent goroutines.
-type Client struct {
-	// Timeout specifies the socket read/write timeout.
-	// If zero, DefaultTimeout is used.
-	Timeout time.Duration
-
-	// MaxIdleConns specifies the maximum number of idle connections that will
-	// be maintained per address. If less than one, DefaultMaxIdleConns will be
-	// used.
-	//
-	// Consider your expected traffic rates and latency carefully. This should
-	// be set to a number higher than your peak parallel requests.
-	MaxIdleConns int
-
-	selector ServerSelector
-
-	lk       sync.Mutex
-	freeconn map[string][]*conn
-}
-
-// Item is an item to be got or stored in a memcached server.
-type Item struct {
-	// Key is the Item's key (250 bytes maximum).
-	Key string
-
-	// Value is the Item's value.
-	Value []byte
-
-	// Flags are server-opaque flags whose semantics are entirely
-	// up to the app.
-	Flags uint32
-
-	// Expiration is the cache expiration time, in seconds: either a relative
-	// time from now (up to 1 month), or an absolute Unix epoch time.
-	// Zero means the Item has no expiration time.
-	Expiration int32
-
-	// Compare and swap ID.
-	casid uint64
-}
-
-// conn is a connection to a server.
-type conn struct {
-	nc   net.Conn
-	rw   *bufio.ReadWriter
-	addr net.Addr
-	c    *Client
-}
-
-// release returns this connection back to the client's free pool
-func (cn *conn) release() {
-	cn.c.putFreeConn(cn.addr, cn)
-}
-
-func (cn *conn) extendDeadline() {
-	cn.nc.SetDeadline(time.Now().Add(cn.c.netTimeout()))
-}
-
-// condRelease releases this connection if the error pointed to by err
-// is nil (not an error) or is only a protocol level error (e.g. a
-// cache miss).  The purpose is to not recycle TCP connections that
-// are bad.
-func (cn *conn) condRelease(err *error) {
-	if *err == nil || resumableError(*err) {
-		cn.release()
-	} else {
-		cn.nc.Close()
-	}
-}
-
-func (c *Client) putFreeConn(addr net.Addr, cn *conn) {
-	c.lk.Lock()
-	defer c.lk.Unlock()
-	if c.freeconn == nil {
-		c.freeconn = make(map[string][]*conn)
-	}
-	freelist := c.freeconn[addr.String()]
-	if len(freelist) >= c.maxIdleConns() {
-		cn.nc.Close()
-		return
-	}
-	c.freeconn[addr.String()] = append(freelist, cn)
-}
-
-func (c *Client) getFreeConn(addr net.Addr) (cn *conn, ok bool) {
-	c.lk.Lock()
-	defer c.lk.Unlock()
-	if c.freeconn == nil {
-		return nil, false
-	}
-	freelist, ok := c.freeconn[addr.String()]
-	if !ok || len(freelist) == 0 {
-		return nil, false
-	}
-	cn = freelist[len(freelist)-1]
-	c.freeconn[addr.String()] = freelist[:len(freelist)-1]
-	return cn, true
-}
-
-func (c *Client) netTimeout() time.Duration {
-	if c.Timeout != 0 {
-		return c.Timeout
-	}
-	return DefaultTimeout
-}
-
-func (c *Client) maxIdleConns() int {
-	if c.MaxIdleConns > 0 {
-		return c.MaxIdleConns
-	}
-	return DefaultMaxIdleConns
-}
-
-// ConnectTimeoutError is the error type used when it takes
-// too long to connect to the desired host. This level of
-// detail can generally be ignored.
-type ConnectTimeoutError struct {
-	Addr net.Addr
-}
-
-func (cte *ConnectTimeoutError) Error() string {
-	return "memcache: connect timeout to " + cte.Addr.String()
-}
-
-func (c *Client) dial(addr net.Addr) (net.Conn, error) {
-	type connError struct {
-		cn  net.Conn
-		err error
-	}
-
-	nc, err := net.DialTimeout(addr.Network(), addr.String(), c.netTimeout())
-	if err == nil {
-		return nc, nil
-	}
-
-	if ne, ok := err.(net.Error); ok && ne.Timeout() {
-		return nil, &ConnectTimeoutError{addr}
-	}
-
-	return nil, err
-}
-
-func (c *Client) getConn(addr net.Addr) (*conn, error) {
-	cn, ok := c.getFreeConn(addr)
-	if ok {
-		cn.extendDeadline()
-		return cn, nil
-	}
-	nc, err := c.dial(addr)
-	if err != nil {
-		return nil, err
-	}
-	cn = &conn{
-		nc:   nc,
-		addr: addr,
-		rw:   bufio.NewReadWriter(bufio.NewReader(nc), bufio.NewWriter(nc)),
-		c:    c,
-	}
-	cn.extendDeadline()
-	return cn, nil
-}
-
-func (c *Client) onItem(item *Item, fn func(*Client, *bufio.ReadWriter, *Item) error) error {
-	addr, err := c.selector.PickServer(item.Key)
-	if err != nil {
-		return err
-	}
-	cn, err := c.getConn(addr)
-	if err != nil {
-		return err
-	}
-	defer cn.condRelease(&err)
-	if err = fn(c, cn.rw, item); err != nil {
-		return err
-	}
-	return nil
-}
-
-func (c *Client) FlushAll() error {
-	return c.selector.Each(c.flushAllFromAddr)
-}
-
-// Get gets the item for the given key. ErrCacheMiss is returned for a
-// memcache cache miss. The key must be at most 250 bytes in length.
-func (c *Client) Get(key string) (item *Item, err error) {
-	err = c.withKeyAddr(key, func(addr net.Addr) error {
-		return c.getFromAddr(addr, []string{key}, func(it *Item) { item = it })
-	})
-	if err == nil && item == nil {
-		err = ErrCacheMiss
-	}
-	return
-}
-
-// Touch updates the expiry for the given key. The seconds parameter is either
-// a Unix timestamp or, if seconds is less than 1 month, the number of seconds
-// into the future at which time the item will expire. Zero means the item has
-// no expiration time. ErrCacheMiss is returned if the key is not in the cache.
-// The key must be at most 250 bytes in length.
-func (c *Client) Touch(key string, seconds int32) (err error) {
-	return c.withKeyAddr(key, func(addr net.Addr) error {
-		return c.touchFromAddr(addr, []string{key}, seconds)
-	})
-}
-
-func (c *Client) withKeyAddr(key string, fn func(net.Addr) error) (err error) {
-	if !legalKey(key) {
-		return ErrMalformedKey
-	}
-	addr, err := c.selector.PickServer(key)
-	if err != nil {
-		return err
-	}
-	return fn(addr)
-}
-
-func (c *Client) withAddrRw(addr net.Addr, fn func(*bufio.ReadWriter) error) (err error) {
-	cn, err := c.getConn(addr)
-	if err != nil {
-		return err
-	}
-	defer cn.condRelease(&err)
-	return fn(cn.rw)
-}
-
-func (c *Client) withKeyRw(key string, fn func(*bufio.ReadWriter) error) error {
-	return c.withKeyAddr(key, func(addr net.Addr) error {
-		return c.withAddrRw(addr, fn)
-	})
-}
-
-func (c *Client) getFromAddr(addr net.Addr, keys []string, cb func(*Item)) error {
-	return c.withAddrRw(addr, func(rw *bufio.ReadWriter) error {
-		if _, err := fmt.Fprintf(rw, "gets %s\r\n", strings.Join(keys, " ")); err != nil {
-			return err
-		}
-		if err := rw.Flush(); err != nil {
-			return err
-		}
-		if err := parseGetResponse(rw.Reader, cb); err != nil {
-			return err
-		}
-		return nil
-	})
-}
-
-// flushAllFromAddr send the flush_all command to the given addr
-func (c *Client) flushAllFromAddr(addr net.Addr) error {
-	return c.withAddrRw(addr, func(rw *bufio.ReadWriter) error {
-		if _, err := fmt.Fprintf(rw, "flush_all\r\n"); err != nil {
-			return err
-		}
-		if err := rw.Flush(); err != nil {
-			return err
-		}
-		line, err := rw.ReadSlice('\n')
-		if err != nil {
-			return err
-		}
-		switch {
-		case bytes.Equal(line, resultOk):
-			break
-		default:
-			return fmt.Errorf("memcache: unexpected response line from flush_all: %q", string(line))
-		}
-		return nil
-	})
-}
-
-// ping sends the version command to the given addr
-func (c *Client) ping(addr net.Addr) error {
-	return c.withAddrRw(addr, func(rw *bufio.ReadWriter) error {
-		if _, err := fmt.Fprintf(rw, "version\r\n"); err != nil {
-			return err
-		}
-		if err := rw.Flush(); err != nil {
-			return err
-		}
-		line, err := rw.ReadSlice('\n')
-		if err != nil {
-			return err
-		}
-
-		switch {
-		case bytes.HasPrefix(line, versionPrefix):
-			break
-		default:
-			return fmt.Errorf("memcache: unexpected response line from ping: %q", string(line))
-		}
-		return nil
-	})
-}
-
-func (c *Client) touchFromAddr(addr net.Addr, keys []string, expiration int32) error {
-	return c.withAddrRw(addr, func(rw *bufio.ReadWriter) error {
-		for _, key := range keys {
-			if _, err := fmt.Fprintf(rw, "touch %s %d\r\n", key, expiration); err != nil {
-				return err
-			}
-			if err := rw.Flush(); err != nil {
-				return err
-			}
-			line, err := rw.ReadSlice('\n')
-			if err != nil {
-				return err
-			}
-			switch {
-			case bytes.Equal(line, resultTouched):
-				break
-			case bytes.Equal(line, resultNotFound):
-				return ErrCacheMiss
-			default:
-				return fmt.Errorf("memcache: unexpected response line from touch: %q", string(line))
-			}
-		}
-		return nil
-	})
-}
-
-// GetMulti is a batch version of Get. The returned map from keys to
-// items may have fewer elements than the input slice, due to memcache
-// cache misses. Each key must be at most 250 bytes in length.
-// If no error is returned, the returned map will also be non-nil.
-func (c *Client) GetMulti(keys []string) (map[string]*Item, error) {
-	var lk sync.Mutex
-	m := make(map[string]*Item)
-	addItemToMap := func(it *Item) {
-		lk.Lock()
-		defer lk.Unlock()
-		m[it.Key] = it
-	}
-
-	keyMap := make(map[net.Addr][]string)
-	for _, key := range keys {
-		if !legalKey(key) {
-			return nil, ErrMalformedKey
-		}
-		addr, err := c.selector.PickServer(key)
-		if err != nil {
-			return nil, err
-		}
-		keyMap[addr] = append(keyMap[addr], key)
-	}
-
-	ch := make(chan error, buffered)
-	for addr, keys := range keyMap {
-		go func(addr net.Addr, keys []string) {
-			ch <- c.getFromAddr(addr, keys, addItemToMap)
-		}(addr, keys)
-	}
-
-	var err error
-	for _ = range keyMap {
-		if ge := <-ch; ge != nil {
-			err = ge
-		}
-	}
-	return m, err
-}
-
-// parseGetResponse reads a GET response from r and calls cb for each
-// read and allocated Item
-func parseGetResponse(r *bufio.Reader, cb func(*Item)) error {
-	for {
-		line, err := r.ReadSlice('\n')
-		if err != nil {
-			return err
-		}
-		if bytes.Equal(line, resultEnd) {
-			return nil
-		}
-		it := new(Item)
-		size, err := scanGetResponseLine(line, it)
-		if err != nil {
-			return err
-		}
-		it.Value = make([]byte, size+2)
-		_, err = io.ReadFull(r, it.Value)
-		if err != nil {
-			it.Value = nil
-			return err
-		}
-		if !bytes.HasSuffix(it.Value, crlf) {
-			it.Value = nil
-			return fmt.Errorf("memcache: corrupt get result read")
-		}
-		it.Value = it.Value[:size]
-		cb(it)
-	}
-}
-
-// scanGetResponseLine populates it and returns the declared size of the item.
-// It does not read the bytes of the item.
-func scanGetResponseLine(line []byte, it *Item) (size int, err error) {
-	pattern := "VALUE %s %d %d %d\r\n"
-	dest := []interface{}{&it.Key, &it.Flags, &size, &it.casid}
-	if bytes.Count(line, space) == 3 {
-		pattern = "VALUE %s %d %d\r\n"
-		dest = dest[:3]
-	}
-	n, err := fmt.Sscanf(string(line), pattern, dest...)
-	if err != nil || n != len(dest) {
-		return -1, fmt.Errorf("memcache: unexpected line in get response: %q", line)
-	}
-	return size, nil
-}
-
-// Set writes the given item, unconditionally.
-func (c *Client) Set(item *Item) error {
-	return c.onItem(item, (*Client).set)
-}
-
-func (c *Client) set(rw *bufio.ReadWriter, item *Item) error {
-	return c.populateOne(rw, "set", item)
-}
-
-// Add writes the given item, if no value already exists for its
-// key. ErrNotStored is returned if that condition is not met.
-func (c *Client) Add(item *Item) error {
-	return c.onItem(item, (*Client).add)
-}
-
-func (c *Client) add(rw *bufio.ReadWriter, item *Item) error {
-	return c.populateOne(rw, "add", item)
-}
-
-// Replace writes the given item, but only if the server *does*
-// already hold data for this key
-func (c *Client) Replace(item *Item) error {
-	return c.onItem(item, (*Client).replace)
-}
-
-func (c *Client) replace(rw *bufio.ReadWriter, item *Item) error {
-	return c.populateOne(rw, "replace", item)
-}
-
-// CompareAndSwap writes the given item that was previously returned
-// by Get, if the value was neither modified or evicted between the
-// Get and the CompareAndSwap calls. The item's Key should not change
-// between calls but all other item fields may differ. ErrCASConflict
-// is returned if the value was modified in between the
-// calls. ErrNotStored is returned if the value was evicted in between
-// the calls.
-func (c *Client) CompareAndSwap(item *Item) error {
-	return c.onItem(item, (*Client).cas)
-}
-
-func (c *Client) cas(rw *bufio.ReadWriter, item *Item) error {
-	return c.populateOne(rw, "cas", item)
-}
-
-func (c *Client) populateOne(rw *bufio.ReadWriter, verb string, item *Item) error {
-	if !legalKey(item.Key) {
-		return ErrMalformedKey
-	}
-	var err error
-	if verb == "cas" {
-		_, err = fmt.Fprintf(rw, "%s %s %d %d %d %d\r\n",
-			verb, item.Key, item.Flags, item.Expiration, len(item.Value), item.casid)
-	} else {
-		_, err = fmt.Fprintf(rw, "%s %s %d %d %d\r\n",
-			verb, item.Key, item.Flags, item.Expiration, len(item.Value))
-	}
-	if err != nil {
-		return err
-	}
-	if _, err = rw.Write(item.Value); err != nil {
-		return err
-	}
-	if _, err := rw.Write(crlf); err != nil {
-		return err
-	}
-	if err := rw.Flush(); err != nil {
-		return err
-	}
-	line, err := rw.ReadSlice('\n')
-	if err != nil {
-		return err
-	}
-	switch {
-	case bytes.Equal(line, resultStored):
-		return nil
-	case bytes.Equal(line, resultNotStored):
-		return ErrNotStored
-	case bytes.Equal(line, resultExists):
-		return ErrCASConflict
-	case bytes.Equal(line, resultNotFound):
-		return ErrCacheMiss
-	}
-	return fmt.Errorf("memcache: unexpected response line from %q: %q", verb, string(line))
-}
-
-func writeReadLine(rw *bufio.ReadWriter, format string, args ...interface{}) ([]byte, error) {
-	_, err := fmt.Fprintf(rw, format, args...)
-	if err != nil {
-		return nil, err
-	}
-	if err := rw.Flush(); err != nil {
-		return nil, err
-	}
-	line, err := rw.ReadSlice('\n')
-	return line, err
-}
-
-func writeExpectf(rw *bufio.ReadWriter, expect []byte, format string, args ...interface{}) error {
-	line, err := writeReadLine(rw, format, args...)
-	if err != nil {
-		return err
-	}
-	switch {
-	case bytes.Equal(line, resultOK):
-		return nil
-	case bytes.Equal(line, expect):
-		return nil
-	case bytes.Equal(line, resultNotStored):
-		return ErrNotStored
-	case bytes.Equal(line, resultExists):
-		return ErrCASConflict
-	case bytes.Equal(line, resultNotFound):
-		return ErrCacheMiss
-	}
-	return fmt.Errorf("memcache: unexpected response line: %q", string(line))
-}
-
-// Delete deletes the item with the provided key. The error ErrCacheMiss is
-// returned if the item didn't already exist in the cache.
-func (c *Client) Delete(key string) error {
-	return c.withKeyRw(key, func(rw *bufio.ReadWriter) error {
-		return writeExpectf(rw, resultDeleted, "delete %s\r\n", key)
-	})
-}
-
-// DeleteAll deletes all items in the cache.
-func (c *Client) DeleteAll() error {
-	return c.withKeyRw("", func(rw *bufio.ReadWriter) error {
-		return writeExpectf(rw, resultDeleted, "flush_all\r\n")
-	})
-}
-
-// Ping checks all instances if they are alive. Returns error if any
-// of them is down.
-func (c *Client) Ping() error {
-	return c.selector.Each(c.ping)
-}
-
-// Increment atomically increments key by delta. The return value is
-// the new value after being incremented or an error. If the value
-// didn't exist in memcached the error is ErrCacheMiss. The value in
-// memcached must be an decimal number, or an error will be returned.
-// On 64-bit overflow, the new value wraps around.
-func (c *Client) Increment(key string, delta uint64) (newValue uint64, err error) {
-	return c.incrDecr("incr", key, delta)
-}
-
-// Decrement atomically decrements key by delta. The return value is
-// the new value after being decremented or an error. If the value
-// didn't exist in memcached the error is ErrCacheMiss. The value in
-// memcached must be an decimal number, or an error will be returned.
-// On underflow, the new value is capped at zero and does not wrap
-// around.
-func (c *Client) Decrement(key string, delta uint64) (newValue uint64, err error) {
-	return c.incrDecr("decr", key, delta)
-}
-
-func (c *Client) incrDecr(verb, key string, delta uint64) (uint64, error) {
-	var val uint64
-	err := c.withKeyRw(key, func(rw *bufio.ReadWriter) error {
-		line, err := writeReadLine(rw, "%s %s %d\r\n", verb, key, delta)
-		if err != nil {
-			return err
-		}
-		switch {
-		case bytes.Equal(line, resultNotFound):
-			return ErrCacheMiss
-		case bytes.HasPrefix(line, resultClientErrorPrefix):
-			errMsg := line[len(resultClientErrorPrefix) : len(line)-2]
-			return errors.New("memcache: client error: " + string(errMsg))
-		}
-		val, err = strconv.ParseUint(string(line[:len(line)-2]), 10, 64)
-		if err != nil {
-			return err
-		}
-		return nil
-	})
-	return val, err
-}
diff --git a/vendor/github.com/bradfitz/gomemcache/memcache/selector.go b/vendor/github.com/bradfitz/gomemcache/memcache/selector.go
deleted file mode 100644
index 89ad81e0d8..0000000000
--- a/vendor/github.com/bradfitz/gomemcache/memcache/selector.go
+++ /dev/null
@@ -1,129 +0,0 @@
-/*
-Copyright 2011 Google 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 memcache
-
-import (
-	"hash/crc32"
-	"net"
-	"strings"
-	"sync"
-)
-
-// ServerSelector is the interface that selects a memcache server
-// as a function of the item's key.
-//
-// All ServerSelector implementations must be safe for concurrent use
-// by multiple goroutines.
-type ServerSelector interface {
-	// PickServer returns the server address that a given item
-	// should be shared onto.
-	PickServer(key string) (net.Addr, error)
-	Each(func(net.Addr) error) error
-}
-
-// ServerList is a simple ServerSelector. Its zero value is usable.
-type ServerList struct {
-	mu    sync.RWMutex
-	addrs []net.Addr
-}
-
-// staticAddr caches the Network() and String() values from any net.Addr.
-type staticAddr struct {
-	ntw, str string
-}
-
-func newStaticAddr(a net.Addr) net.Addr {
-	return &staticAddr{
-		ntw: a.Network(),
-		str: a.String(),
-	}
-}
-
-func (s *staticAddr) Network() string { return s.ntw }
-func (s *staticAddr) String() string  { return s.str }
-
-// SetServers changes a ServerList's set of servers at runtime and is
-// safe for concurrent use by multiple goroutines.
-//
-// Each server is given equal weight. A server is given more weight
-// if it's listed multiple times.
-//
-// SetServers returns an error if any of the server names fail to
-// resolve. No attempt is made to connect to the server. If any error
-// is returned, no changes are made to the ServerList.
-func (ss *ServerList) SetServers(servers ...string) error {
-	naddr := make([]net.Addr, len(servers))
-	for i, server := range servers {
-		if strings.Contains(server, "/") {
-			addr, err := net.ResolveUnixAddr("unix", server)
-			if err != nil {
-				return err
-			}
-			naddr[i] = newStaticAddr(addr)
-		} else {
-			tcpaddr, err := net.ResolveTCPAddr("tcp", server)
-			if err != nil {
-				return err
-			}
-			naddr[i] = newStaticAddr(tcpaddr)
-		}
-	}
-
-	ss.mu.Lock()
-	defer ss.mu.Unlock()
-	ss.addrs = naddr
-	return nil
-}
-
-// Each iterates over each server calling the given function
-func (ss *ServerList) Each(f func(net.Addr) error) error {
-	ss.mu.RLock()
-	defer ss.mu.RUnlock()
-	for _, a := range ss.addrs {
-		if err := f(a); nil != err {
-			return err
-		}
-	}
-	return nil
-}
-
-// keyBufPool returns []byte buffers for use by PickServer's call to
-// crc32.ChecksumIEEE to avoid allocations. (but doesn't avoid the
-// copies, which at least are bounded in size and small)
-var keyBufPool = sync.Pool{
-	New: func() interface{} {
-		b := make([]byte, 256)
-		return &b
-	},
-}
-
-func (ss *ServerList) PickServer(key string) (net.Addr, error) {
-	ss.mu.RLock()
-	defer ss.mu.RUnlock()
-	if len(ss.addrs) == 0 {
-		return nil, ErrNoServers
-	}
-	if len(ss.addrs) == 1 {
-		return ss.addrs[0], nil
-	}
-	bufp := keyBufPool.Get().(*[]byte)
-	n := copy(*bufp, key)
-	cs := crc32.ChecksumIEEE((*bufp)[:n])
-	keyBufPool.Put(bufp)
-
-	return ss.addrs[cs%uint32(len(ss.addrs))], nil
-}