beanstalkd

package module
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 Go to latest Published: Dec 31, 2015 License: MIT Imports: 9 Imported by: 3

README

Beanstalkd golang client Ver 1.0

INSTALL

go get github.com/maxid/beanstalkd

USAGE

Producer
package main

import (
	"fmt"
	"github.com/maxid/beanstalkd"
	"os"
	"strconv"
	"time"
)

func main() {
	queue, err := beanstalkd.Dial("127.0.0.1:11300")
	if err != nil {
		os.Exit(0)
	}
	for i := 0; i < 1000; i++ {
		queue.Put(1, 0*time.Second, 5*time.Second, []byte("test "+strconv.Itoa(i)))
		fmt.Println("test " + strconv.Itoa(i))
	}
	queue.Quit()
}
Consumer
package main

import (
	"fmt"
	"github.com/maxid/beanstalkd"
	"os"
)

func main() {
	queue, err := beanstalkd.Dial("127.0.0.1:11300")
	if err != nil {
		os.Exit(0)
	}
	for {
		job, err := queue.Reserve(20)
		if err != nil {
			fmt.Println(err)
			break
		}
		fmt.Println(job.Id, string(job.Data))
		queue.Delete(job.Id)
	}
	queue.Quit()
}

Implemented Commands

Producer commands:

  • use
  • put

Worker commands:

  • reserve
  • delete
  • release
  • bury
  • touch
  • watch
  • ignore

Other commands:

  • peek
  • peek-ready
  • peek-delayed
  • peek-buried
  • kick
  • kick-job
  • stats-job
  • stats-tube
  • stats
  • list-tubes
  • list-tube-used
  • list-tubes-watched
  • quit
  • pause-tube

Release Notes

Latest release is v1.0 that contains API changes, see release notes here

Author

Documentation

Overview

client.go

pool.go (copy from redigo pool.go)

Index

Constants

This section is empty.

Variables

View Source 
var (
	DEFAULT_MAX_ACTIVE = 30                   // default pool size
	DEFAULT_IDEL_TIME  = time.Second * 60 * 5 // connection will be removed after not use
)
View Source 
var ErrPoolExhausted = errors.New("beanstalkd: connection pool exhausted")

ErrPoolExhausted is returned from a pool connection method (Do, Send, Receive, Flush, Err) when the maximum number of database connections in the pool has been reached.

Functions

This section is empty.

Types

type BeanstalkdClient 

type BeanstalkdClient struct {
	// contains filtered or unexported fields
}

beanstalkd client

https://github.com/kr/beanstalkd/blob/master/doc/protocol.txt

Here is a picture of the typical job lifecycle: 

 put            reserve               delete
-----> [READY] ---------> [RESERVED] --------> *poof*

Here is a picture with more possibilities: 

 put with delay               release with delay
----------------> [DELAYED] <------------.
                      |                   |
                      | (time passes)     |
                      |                   |
 put                  v     reserve       |       delete
-----------------> [READY] ---------> [RESERVED] --------> *poof*
                     ^  ^                |  |
                     |   \  release      |  |
                     |    `-------------'   |
                     |                      |
                     | kick                 |
                     |                      |
                     |       bury           |
                  [BURIED] <---------------'
                     |
                     |  delete
                      `--------> *poof*

func Dial 

func Dial(addr string) (*BeanstalkdClient, error)

dial connect to beanstalkd server

func (*BeanstalkdClient) Bury 

func (this *BeanstalkdClient) Bury(id uint64, priority uint32) error

The bury command puts a job into the "buried" state. Buried jobs are put into a FIFO linked list and will not be touched by the server again until a client kicks them with the "kick" command.

The bury command looks like this:

bury <id> <pri>\r\n

  • <id> is the job id to release.

  • <pri> is a new priority to assign to the job.

There are two possible responses:

  • "BURIED\r\n" to indicate success.

  • "NOT_FOUND\r\n" if the job does not exist or is not reserved by the client.

func (*BeanstalkdClient) Delete 

func (this *BeanstalkdClient) Delete(id uint64) error

The delete command removes a job from the server entirely. It is normally used by the client when the job has successfully run to completion. A client can delete jobs that it has reserved, ready jobs, delayed jobs, and jobs that are buried. The delete command looks like this:

delete <id>\r\n

  • <id> is the job id to delete.

The client then waits for one line of response, which may be:

  • "DELETED\r\n" to indicate success.

  • "NOT_FOUND\r\n" if the job does not exist or is not either reserved by the client, ready, or buried. This could happen if the job timed out before the client sent the delete command.

func (*BeanstalkdClient) Ignore 

func (this *BeanstalkdClient) Ignore(tube string) (int, error)

The "ignore" command is for consumers. It removes the named tube from the watch list for the current connection.

ignore <tube>\r\n

The reply is one of:

  • "WATCHING <count>\r\n" to indicate success.

  • <count> is the integer number of tubes currently in the watch list.

  • "NOT_IGNORED\r\n" if the client attempts to ignore the only tube in its watch list.

func (*BeanstalkdClient) Kick 

func (this *BeanstalkdClient) Kick(bound int) (int, error)

The kick command applies only to the currently used tube. It moves jobs into the ready queue. If there are any buried jobs, it will only kick buried jobs. Otherwise it will kick delayed jobs. It looks like:

kick <bound>\r\n

  • <bound> is an integer upper bound on the number of jobs to kick. The server will kick no more than <bound> jobs.

The response is of the form:

KICKED <count>\r\n

  • <count> is an integer indicating the number of jobs actually kicked.

func (*BeanstalkdClient) KickJob 

func (this *BeanstalkdClient) KickJob(id uint64) error

The kick-job command is a variant of kick that operates with a single job identified by its job id. If the given job id exists and is in a buried or delayed state, it will be moved to the ready queue of the the same tube where it currently belongs. The syntax is:

kick-job <id>\r\n

  • <id> is the job id to kick.

The response is one of:

  • "NOT_FOUND\r\n" if the job does not exist or is not in a kickable state. This can also happen upon internal errors.

  • "KICKED\r\n" when the operation succeeded.

func (*BeanstalkdClient) ListTubeUsed 

func (this *BeanstalkdClient) ListTubeUsed() (string, error)

The list-tube-used command returns the tube currently being used by the client. Its form is:

list-tube-used\r\n

The response is:

USING <tube>\r\n

  • <tube> is the name of the tube being used.

func (*BeanstalkdClient) ListTubes 

func (this *BeanstalkdClient) ListTubes() ([]string, error)

The list-tubes command returns a list of all existing tubes. Its form is:

list-tubes\r\n

The response is:

OK <bytes>\r\n <data>\r\n

  • <bytes> is the size of the following data section in bytes.

  • <data> is a sequence of bytes of length <bytes> from the previous line. It is a YAML file containing all tube names as a list of strings.

func (*BeanstalkdClient) ListTubesWatched 

func (this *BeanstalkdClient) ListTubesWatched() ([]string, error)

The list-tubes-watched command returns a list tubes currently being watched by the client. Its form is:

list-tubes-watched\r\n

The response is:

OK <bytes>\r\n <data>\r\n

  • <bytes> is the size of the following data section in bytes.

  • <data> is a sequence of bytes of length <bytes> from the previous line. It is a YAML file containing watched tube names as a list of strings.

func (*BeanstalkdClient) PauseTube 

func (this *BeanstalkdClient) PauseTube(tube string, delay int) error

The pause-tube command can delay any new job being reserved for a given time. Its form is:

pause-tube <tube-name> <delay>\r\n

  • <tube> is the tube to pause

  • <delay> is an integer number of seconds to wait before reserving any more jobs from the queue

There are two possible responses:

  • "PAUSED\r\n" to indicate success.

  • "NOT_FOUND\r\n" if the tube does not exist.

func (*BeanstalkdClient) Peek 

func (this *BeanstalkdClient) Peek(id uint64) (*BeanstalkdJob, error)

The peek commands let the client inspect a job in the system. There are four variations. All but the first operate only on the currently used tube.

  • "peek <id>\r\n" - return job <id>.

  • "peek-ready\r\n" - return the next ready job.

  • "peek-delayed\r\n" - return the delayed job with the shortest delay left.

  • "peek-buried\r\n" - return the next job in the list of buried jobs.

There are two possible responses, either a single line:

  • "NOT_FOUND\r\n" if the requested job doesn't exist or there are no jobs in the requested state.

Or a line followed by a chunk of data, if the command was successful:

FOUND <id> <bytes>\r\n <data>\r\n

  • <id> is the job id.

  • <bytes> is an integer indicating the size of the job body, not including the trailing "\r\n".

  • <data> is the job body -- a sequence of bytes of length <bytes> from the previous line.

func (*BeanstalkdClient) PeekBuried 

func (this *BeanstalkdClient) PeekBuried() (*BeanstalkdJob, error)

func (*BeanstalkdClient) PeekDelayed 

func (this *BeanstalkdClient) PeekDelayed() (*BeanstalkdJob, error)

func (*BeanstalkdClient) PeekReady 

func (this *BeanstalkdClient) PeekReady() (*BeanstalkdJob, error)

func (*BeanstalkdClient) Put 

func (this *BeanstalkdClient) Put(priority uint32, delay, ttr time.Duration, data []byte) (id uint64, err error)

The "put" command is for any process that wants to insert a job into the queue. It comprises a command line followed by the job body:

put <pri> <delay> <ttr> <bytes>\r\n <data>\r\n

It inserts a job into the client's currently used tube (see the "use" command below).

  • <pri> is an integer < 2**32. Jobs with smaller priority values will be scheduled before jobs with larger priorities. The most urgent priority is 0; the least urgent priority is 4,294,967,295.

  • <delay> is an integer number of seconds to wait before putting the job in the ready queue. The job will be in the "delayed" state during this time.

  • <ttr> -- time to run -- is an integer number of seconds to allow a worker to run this job. This time is counted from the moment a worker reserves this job. If the worker does not delete, release, or bury the job within <ttr> seconds, the job will time out and the server will release the job. The minimum ttr is 1. If the client sends 0, the server will silently increase the ttr to 1.

  • <bytes> is an integer indicating the size of the job body, not including the trailing "\r\n". This value must be less than max-job-size (default: 2**16).

  • <data> is the job body -- a sequence of bytes of length <bytes> from the previous line.

After sending the command line and body, the client waits for a reply, which may be:

  • "INSERTED <id>\r\n" to indicate success.

  • <id> is the integer id of the new job

  • "BURIED <id>\r\n" if the server ran out of memory trying to grow the priority queue data structure.

  • <id> is the integer id of the new job

  • "EXPECTED_CRLF\r\n" The job body must be followed by a CR-LF pair, that is, "\r\n". These two bytes are not counted in the job size given by the client in the put command line.

  • "JOB_TOO_BIG\r\n" The client has requested to put a job with a body larger than max-job-size bytes.

  • "DRAINING\r\n" This means that the server has been put into "drain mode" and is no longer accepting new jobs. The client should try another server or disconnect and try again later.

func (*BeanstalkdClient) Quit 

func (this *BeanstalkdClient) Quit() error

The quit command simply closes the connection. Its form is:

quit\r\n

func (*BeanstalkdClient) Release 

func (this *BeanstalkdClient) Release(id uint64, priority uint32, delay time.Duration) error

The release command puts a reserved job back into the ready queue (and marks its state as "ready") to be run by any client. It is normally used when the job fails because of a transitory error. It looks like this:

release <id> <pri> <delay>\r\n

  • <id> is the job id to release.

  • <pri> is a new priority to assign to the job.

  • <delay> is an integer number of seconds to wait before putting the job in the ready queue. The job will be in the "delayed" state during this time.

The client expects one line of response, which may be:

  • "RELEASED\r\n" to indicate success.

  • "BURIED\r\n" if the server ran out of memory trying to grow the priority queue data structure.

  • "NOT_FOUND\r\n" if the job does not exist or is not reserved by the client.

func (*BeanstalkdClient) Reserve 

func (this *BeanstalkdClient) Reserve(seconds int) (*BeanstalkdJob, error)

A process that wants to consume jobs from the queue uses "reserve", "delete", "release", and "bury". The first worker command, "reserve", looks like this:

reserve\r\n

Alternatively, you can specify a timeout as follows:

reserve-with-timeout <seconds>\r\n

This will return a newly-reserved job. If no job is available to be reserved, beanstalkd will wait to send a response until one becomes available. Once a job is reserved for the client, the client has limited time to run (TTR) the job before the job times out. When the job times out, the server will put the job back into the ready queue. Both the TTR and the actual time left can be found in response to the stats-job command.

If more than one job is ready, beanstalkd will choose the one with the smallest priority value. Within each priority, it will choose the one that was received first.

A timeout value of 0 will cause the server to immediately return either a response or TIMED_OUT. A positive value of timeout will limit the amount of time the client will block on the reserve request until a job becomes available.

During the TTR of a reserved job, the last second is kept by the server as a safety margin, during which the client will not be made to wait for another job. If the client issues a reserve command during the safety margin, or if the safety margin arrives while the client is waiting on a reserve command, the server will respond with:

DEADLINE_SOON\r\n

This gives the client a chance to delete or release its reserved job before the server automatically releases it.

TIMED_OUT\r\n

If a non-negative timeout was specified and the timeout exceeded before a job became available, or if the client's connection is half-closed, the server will respond with TIMED_OUT.

Otherwise, the only other response to this command is a successful reservation in the form of a text line followed by the job body:

RESERVED <id> <bytes>\r\n <data>\r\n

  • <id> is the job id -- an integer unique to this job in this instance of beanstalkd.

  • <bytes> is an integer indicating the size of the job body, not including the trailing "\r\n".

  • <data> is the job body -- a sequence of bytes of length <bytes> from the previous line. This is a verbatim copy of the bytes that were originally sent to the server in the put command for this job.

func (*BeanstalkdClient) Stats 

func (this *BeanstalkdClient) Stats() (map[string]string, error)

The stats command gives statistical information about the system as a whole. Its form is:

stats\r\n

The server will respond:

OK <bytes>\r\n <data>\r\n

  • <bytes> is the size of the following data section in bytes.

  • <data> is a sequence of bytes of length <bytes> from the previous line. It is a YAML file with statistical information represented a dictionary.

The stats data for the system is a YAML file representing a single dictionary of strings to scalars. Entries described as "cumulative" are reset when the beanstalkd process starts; they are not stored on disk with the -b flag.

  • "current-jobs-urgent" is the number of ready jobs with priority < 1024.

  • "current-jobs-ready" is the number of jobs in the ready queue.

  • "current-jobs-reserved" is the number of jobs reserved by all clients.

  • "current-jobs-delayed" is the number of delayed jobs.

  • "current-jobs-buried" is the number of buried jobs.

  • "cmd-put" is the cumulative number of put commands.

  • "cmd-peek" is the cumulative number of peek commands.

  • "cmd-peek-ready" is the cumulative number of peek-ready commands.

  • "cmd-peek-delayed" is the cumulative number of peek-delayed commands.

  • "cmd-peek-buried" is the cumulative number of peek-buried commands.

  • "cmd-reserve" is the cumulative number of reserve commands.

  • "cmd-use" is the cumulative number of use commands.

  • "cmd-watch" is the cumulative number of watch commands.

  • "cmd-ignore" is the cumulative number of ignore commands.

  • "cmd-delete" is the cumulative number of delete commands.

  • "cmd-release" is the cumulative number of release commands.

  • "cmd-bury" is the cumulative number of bury commands.

  • "cmd-kick" is the cumulative number of kick commands.

  • "cmd-stats" is the cumulative number of stats commands.

  • "cmd-stats-job" is the cumulative number of stats-job commands.

  • "cmd-stats-tube" is the cumulative number of stats-tube commands.

  • "cmd-list-tubes" is the cumulative number of list-tubes commands.

  • "cmd-list-tube-used" is the cumulative number of list-tube-used commands.

  • "cmd-list-tubes-watched" is the cumulative number of list-tubes-watched commands.

  • "cmd-pause-tube" is the cumulative number of pause-tube commands.

  • "job-timeouts" is the cumulative count of times a job has timed out.

  • "total-jobs" is the cumulative count of jobs created.

  • "max-job-size" is the maximum number of bytes in a job.

  • "current-tubes" is the number of currently-existing tubes.

  • "current-connections" is the number of currently open connections.

  • "current-producers" is the number of open connections that have each issued at least one put command.

  • "current-workers" is the number of open connections that have each issued at least one reserve command.

  • "current-waiting" is the number of open connections that have issued a reserve command but not yet received a response.

  • "total-connections" is the cumulative count of connections.

  • "pid" is the process id of the server.

  • "version" is the version string of the server.

  • "rusage-utime" is the cumulative user CPU time of this process in seconds and microseconds.

  • "rusage-stime" is the cumulative system CPU time of this process in seconds and microseconds.

  • "uptime" is the number of seconds since this server process started running.

  • "binlog-oldest-index" is the index of the oldest binlog file needed to store the current jobs.

  • "binlog-current-index" is the index of the current binlog file being written to. If binlog is not active this value will be 0.

  • "binlog-max-size" is the maximum size in bytes a binlog file is allowed to get before a new binlog file is opened.

  • "binlog-records-written" is the cumulative number of records written to the binlog.

  • "binlog-records-migrated" is the cumulative number of records written as part of compaction.

  • "id" is a random id string for this server process, generated when each beanstalkd process starts.

  • "hostname" the hostname of the machine as determined by uname.

func (*BeanstalkdClient) StatsJob 

func (this *BeanstalkdClient) StatsJob(id uint64) (map[string]string, error)

The stats-job command gives statistical information about the specified job if it exists. Its form is:

stats-job <id>\r\n

  • <id> is a job id.

The response is one of:

  • "NOT_FOUND\r\n" if the job does not exist.

  • "OK <bytes>\r\n<data>\r\n"

  • <bytes> is the size of the following data section in bytes.

  • <data> is a sequence of bytes of length <bytes> from the previous line. It is a YAML file with statistical information represented a dictionary.

The stats-job data is a YAML file representing a single dictionary of strings to scalars. It contains these keys:

  • "id" is the job id

  • "tube" is the name of the tube that contains this job

  • "state" is "ready" or "delayed" or "reserved" or "buried"

  • "pri" is the priority value set by the put, release, or bury commands.

  • "age" is the time in seconds since the put command that created this job.

  • "time-left" is the number of seconds left until the server puts this job into the ready queue. This number is only meaningful if the job is reserved or delayed. If the job is reserved and this amount of time elapses before its state changes, it is considered to have timed out.

  • "file" is the number of the earliest binlog file containing this job. If -b wasn't used, this will be 0.

  • "reserves" is the number of times this job has been reserved.

  • "timeouts" is the number of times this job has timed out during a reservation.

  • "releases" is the number of times a client has released this job from a reservation.

  • "buries" is the number of times this job has been buried.

  • "kicks" is the number of times this job has been kicked.

func (*BeanstalkdClient) StatsTube 

func (this *BeanstalkdClient) StatsTube(tube string) (map[string]string, error)

The stats-tube command gives statistical information about the specified tube if it exists. Its form is:

stats-tube <tube>\r\n

  • <tube> is a name at most 200 bytes. Stats will be returned for this tube.

The response is one of:

  • "NOT_FOUND\r\n" if the tube does not exist.

  • "OK <bytes>\r\n<data>\r\n"

  • <bytes> is the size of the following data section in bytes.

  • <data> is a sequence of bytes of length <bytes> from the previous line. It is a YAML file with statistical information represented a dictionary.

The stats-tube data is a YAML file representing a single dictionary of strings to scalars. It contains these keys:

  • "name" is the tube's name.

  • "current-jobs-urgent" is the number of ready jobs with priority < 1024 in this tube.

  • "current-jobs-ready" is the number of jobs in the ready queue in this tube.

  • "current-jobs-reserved" is the number of jobs reserved by all clients in this tube.

  • "current-jobs-delayed" is the number of delayed jobs in this tube.

  • "current-jobs-buried" is the number of buried jobs in this tube.

  • "total-jobs" is the cumulative count of jobs created in this tube in the current beanstalkd process.

  • "current-using" is the number of open connections that are currently using this tube.

  • "current-waiting" is the number of open connections that have issued a reserve command while watching this tube but not yet received a response.

  • "current-watching" is the number of open connections that are currently watching this tube.

  • "pause" is the number of seconds the tube has been paused for.

  • "cmd-delete" is the cumulative number of delete commands for this tube

  • "cmd-pause-tube" is the cumulative number of pause-tube commands for this tube.

  • "pause-time-left" is the number of seconds until the tube is un-paused.

func (*BeanstalkdClient) Touch 

func (this *BeanstalkdClient) Touch(id uint64) error

The "touch" command allows a worker to request more time to work on a job. This is useful for jobs that potentially take a long time, but you still want the benefits of a TTR pulling a job away from an unresponsive worker. A worker may periodically tell the server that it's still alive and processing a job (e.g. it may do this on DEADLINE_SOON). The command postpones the auto release of a reserved job until TTR seconds from when the command is issued.

The touch command looks like this:

touch <id>\r\n

  • <id> is the ID of a job reserved by the current connection.

There are two possible responses:

  • "TOUCHED\r\n" to indicate success.

  • "NOT_FOUND\r\n" if the job does not exist or is not reserved by the client.

func (*BeanstalkdClient) Use 

func (this *BeanstalkdClient) Use(tube string) error

The "use" command is for producers. Subsequent put commands will put jobs into the tube specified by this command. If no use command has been issued, jobs will be put into the tube named "default". use <tube>\r\n

  • <tube> is a name at most 200 bytes. It specifies the tube to use. If the tube does not exist, it will be created.

The only reply is: USING <tube>\r\n

  • <tube> is the name of the tube now being used.

func (*BeanstalkdClient) Watch 

func (this *BeanstalkdClient) Watch(tube string) (int, error)

The "watch" command adds the named tube to the watch list for the current connection. A reserve command will take a job from any of the tubes in the watch list. For each new connection, the watch list initially consists of one tube, named "default".

watch <tube>\r\n

  • <tube> is a name at most 200 bytes. It specifies a tube to add to the watch list. If the tube doesn't exist, it will be created.

The reply is:

WATCHING <count>\r\n

  • <count> is the integer number of tubes currently in the watch list.

type BeanstalkdJob 

type BeanstalkdJob struct {
	Id   uint64 // Job ID
	Data []byte // Job Data
}

beanstalkd job

func NewBeanstalkdJob 

func NewBeanstalkdJob(id uint64, data []byte) *BeanstalkdJob

type BeanstalkdPool 

type BeanstalkdPool struct {
	// Dial is an application supplied function for creating and configuring a connection
	Dial func(tube string) (Client, error)

	// TestOnBorrow is an optional application supplied function for checking
	// the health of an idle connection before the connection is used again by
	// the application. Argument t is the time that the connection was returned
	// to the pool. If the function returns an error, then the connection is
	// closed.
	TestOnBorrow func(c Client, t time.Time) error

	// Maximum number of idle connections in the pool.
	MaxIdle int

	// Maximum number of connections allocated by the pool at a given time.
	// When zero, there is no limit on the number of connections in the pool.
	MaxActive int

	// Close connections after remaining idle for this duration. If the value
	// is zero, then idle connections are not closed. Applications should set
	// the timeout to a value less than the server's timeout.
	IdleTimeout time.Duration

	Wait bool
	// contains filtered or unexported fields
}

beanstalkd pool

func NewBeanstalkdPool 

func NewBeanstalkdPool(fn func(tube string) (Client, error), maxIdle int) *BeanstalkdPool

func (*BeanstalkdPool) ActiveCount 

func (this *BeanstalkdPool) ActiveCount() int

ActiveCount returns the number of active connections in the pool.

func (*BeanstalkdPool) Close 

func (this *BeanstalkdPool) Close() error

Close releases the resources used by the pool.

func (*BeanstalkdPool) Get 

func (this *BeanstalkdPool) Get(tube string) Client

Get gets a connection. The application must close the returned connection. This method always returns a valid connection so that applications can defer error handling to the first use of the connection. If there is an error getting an underlying connection, then the connection Err, Do, Send, Flush and Receive methods return that error.

type Client 

type Client interface {
	Put(priority uint32, delay, ttr time.Duration, data []byte) (id uint64, err error)
	Use(tube string) error
	Reserve(seconds int) (*BeanstalkdJob, error)
	Delete(id uint64) error
	Release(id uint64, priority uint32, delay time.Duration) error
	Bury(id uint64, priority uint32) error
	Touch(id uint64) error
	Watch(tube string) (int, error)
	Ignore(tube string) (int, error)
	Peek(id uint64) (*BeanstalkdJob, error)
	PeekReady() (*BeanstalkdJob, error)
	PeekDelayed() (*BeanstalkdJob, error)
	PeekBuried() (*BeanstalkdJob, error)
	Kick(bound int) (int, error)
	KickJob(id uint64) error
	StatsJob(id uint64) (map[string]string, error)
	StatsTube(tube string) (map[string]string, error)
	Stats() (map[string]string, error)
	ListTubes() ([]string, error)
	ListTubeUsed() (string, error)
	ListTubesWatched() ([]string, error)
	Quit() error
	PauseTube(tube string, delay int) error
}

Client represents a connection to a Beanstalkd server.

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