A memcached binary protocol toolkit for go.

Related tags

Caching gomemcached
Overview

gomemcached

This is a memcached binary protocol toolkit in go.

It provides client and server functionality as well as a little sample server showing how I might make a server if I valued purity over performance.

Server Design

overview

The basic design can be seen in gocache. A storage server is run as a goroutine that receives a MCRequest on a channel, and then issues an MCResponse to a channel contained within the request.

Each connection is a separate goroutine, of course, and is responsible for all IO for that connection until the connection drops or the dataServer decides it's stupid and sends a fatal response back over the channel.

There is currently no work at all in making the thing perform (there are specific areas I know need work). This is just my attempt to learn the language somewhat.

Comments
  • added support for SASL auth commands

    added support for SASL auth commands

    this is required to allow go-couchbase to write to buckets other than default

    all the changes from "dustin" to "mschoch" are unfortunate, but i didn't see a good way around that to easily test my changes and eventually send a pull request. perhaps you can suggest a better workflow.

    also, this is my first go.

    opened by mschoch 3
  • Client howto?

    Client howto?

    Hi,

    First thanks for this piece of code (and for memcache). You seems to be the only go memcache binary client out there!

    I'm just wondering if i should use only one connection (memcached.Connect) and use it in every goroutine (are connections goroutine safe?) or should i use one connection per goroutine or ...

    Also is the readme still accurate (There is currently no work at all in making the thing perform (there are specific areas I know need work). This is just my attempt to learn the language somewhat.)?

    Are you or other people succesfully using it "in production"?

    Thanks in advance

    opened by champtar 2
  • Return the most up-to-date CAS on success.

    Return the most up-to-date CAS on success.

    Normally CAS isn't checked in the success cases, except when waiting on data to be persisted. Peviously the library failed to update the CAS value on success causing WriteUpdate calls with the Index/Persist flags set to always fail with ErrOverwritten.

    These were false errors, as the library was always using the pre-modification CAS value as input into the observe function instead of the post-modification CAS value.

    opened by mendsley 2
  • Updating a key resets it's expiry

    Updating a key resets it's expiry

    https://github.com/dustin/gomemcached/blob/master/client/mc.go#L389

    Why is this done? It appears to ignore the expiry value passed in and reset it to 0.

    In our system, this leads to updated keys never expiring. The fix is easy, but wondering why this was done in the first place?

    opened by ryanslade 1
  • Installation of GoMemcached client fails

    Installation of GoMemcached client fails

    When installing go-couchbase, it installs this package as well and it fails saying this.

    # github.com/dustin/gomemcached/client
    /usr/lib/go/src/pkg/github.com/dustin/gomemcached/client/mc.go:339: function ends without a return statement
    /usr/lib/go/src/pkg/github.com/dustin/gomemcached/client/tap_feed.go:110: function ends without a return statement
    
    opened by srinathgs 1
  • Implement basic opcode dispatch

    Implement basic opcode dispatch

    Right now, all commands return "unknown command". It should be trivial to implement a new module that dispatches based on opcode lookup in a map or even array.

    opened by dustin 1
  • License

    License

    Hi! What about license for the code? Please, add one. I think BSD-style license is a good choise. Go (http://golang.org/LICENSE) and a lot of go libraries use it.

    opened by orofarne 0
  • Missing null check on transmit

    Missing null check on transmit

    Saw this crash:

    github.com/dustin/gomemcached/client.(*Client).Transmit(0x0, 0xf8401c52d0, 0xf8401bf740, 0x1e0000001e, 0xf8402bb610, ...)
            /Users/dustin/go/src/github.com/dustin/gomemcached/client/mc.go:68 +0x29
    github.com/dustin/gomemcached/client.(*Client).GetBulk(0x0, 0x3d9, 0xf8402c9000, 0x100000001, 0x0, ...)
            /Users/dustin/go/src/github.com/dustin/gomemcached/client/mc.go:231 +0x349
    github.com/couchbaselabs/go-couchbase.(*Bucket).doBulkGet(0xf8400fd500, 0xf8401003d9, 0xf8402c9000, 0x100000001, 0xf84014e5a0, ...)
            /Users/dustin/go/src/github.com/couchbaselabs/go-couchbase/client.go:179 +0x171
    created by github.com/couchbaselabs/go-couchbase.(*Bucket).GetBulk
            /Users/dustin/go/src/github.com/couchbaselabs/go-couchbase/client.go:210 +0x2fb
    
    Bug 
    opened by dustin 0
  • fix read body len bug when key and extras len is zero

    fix read body len bug when key and extras len is zero

    Hi, Dustin: First of all, please forgive me for not being good in English. Memcached binary protocol: Increment, Decrement, version have response:

    • MUST NOT have extras.
    • MUST NOT have key.
    • MUST have value.

    This bug causes the body bytes not to be read. version doc

    opened by felixhao 0
  • Avoid allocating new slice for data on every Receive()

    Avoid allocating new slice for data on every Receive()

    In MCRequest.Receive, a new buffer is allocated for every receive for the body of the request:

    buf := make([]byte, klen+elen+bodyLen)
    

    It would be great if this function could instead accept a buffer as an argument so that buffers could be re-used across requests. The code could use cap(buf) to ensure that the buffer is long enough, and buf = buf[:klen+elen+bodyLen] to limit its length. Only if it buf is too small should it allocate its own (and potentially warn the caller that the buffer was not used).

    opened by jonhoo 0
  • [client] Unknown command

    [client] Unknown command

    This is the error message:

    MCResponse status=UNKNOWN_COMMAND, opcode=SASL_LIST_MECHS,
     opaque=0, msg: Unknown command
    

    This is the code:

    
    func Memcache() {
        client, err := memcached.Connect("tcp", "127.0.0.1:11211")
        if err != nil {
            log.Fatalf("Error connecting: %v", err)
        }
    
        resp, err := client.Auth("memcache", "password")
        if err != nil {
            log.Fatalf("auth error: %v", err)
        }
        log.Printf("Auth response = %v", resp)
    }
    
    opened by btfak 1
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