leveldb - golang - levigo

[Prajakta Dandawate]

Hello

I am very new to golang and have a basic question

Please let me know if there exists latest working leveldb package can be used by golang?

Is there any example?

Which leveldb should be used?

go get code.google.com/p/leveldb-go

or

go get github.com/syndtr/goleveldb/leveldb

Regards

PD

[Michael Jones]

I use levigo by J. M. Hodges:

https://www.google.com/url?sa=t&source=web&rct=j&ei=z2NmVYS9OIKroQTb2YLQDg&url=https://github.com/jmhodges/levigo&ved=0CB4QFjAA&usg=AFQjCNEoSxZ0uk5YB-x2hKMpH9oGRmfDzw

Wotks perfectly for me.

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[Matthew Zimmerman]

And I've usedgithub.com/syndtr/goleveldb/leveldb which is working great for me.  code.google.com/p/leveldb-go is not being maintained anymore.

[Nigel Tao]

On Thu, May 28, 2015 at 10:57 AM, Matthew Zimmerman
<mzimm...@gmail.com> wrote:
> code.google.com/p/leveldb-go is not being maintained anymore.

Yeah, I haven't found the time yet to bring
code.google.com/p/leveldb-go to production-readiness, as I have had
higher priorities. Some of those have been work related, others have
been family related.

I'd still like to finish it someday, and I'll let golang-nuts know
when I'd like more attention on it, but for now, it's not ready yet.

[Matthew Zimmerman]

** Back on list **

That's because you're using levigo which is a cgo based wrapper for the C-based leveldb.  You may have fetched github.com/syndtr/goleveldb/leveldb using go get, but you're still referencing levigo in your import paths.  syndtr's implementation doesn't reference any C header files since it's a pure Go implementation.

On Wed, May 27, 2015 at 9:29 PM Prajakta Dandawate <prajakta....@gmail.com> wrote:

I got the github.com/syndtr/goleveldb/leveldb

Now I am getting following error. Please help me.

 go build ./...
# github.com/jmhodges/levigo/examples
src/github.com/jmhodges/levigo/examples/comparator_example.go:6:23: error: leveldb/c.h: No such file or directory
# github.com/jmhodges/levigo
src/github.com/jmhodges/levigo/batch.go:4:24: error: leveldb/c.h: No such file or directory

Thanks

[Prajakta Dandawate]

Got it working.

Thank very much for your support

[Prajakta Dandawate]

Hello All, 

Our team wants to try out and compare the golang c or c++ library and integrate with go.. 

I was referring to https://github.com/google/leveldb I hope that's the valid soruce.

Please let us know your views.

Regards

Prajakta

[Nigel Tao]

On Fri, May 29, 2015 at 3:56 AM, Prajakta Dandawate
<prajakta....@gmail.com> wrote:
> I was referring to https://github.com/google/leveldb I hope that's the valid
> soruce.

Yes, that's the canonical source.

[Prajakta Dandawate]

 I am stuck at calling the leveldb_open method.

When I build go code it shows following error

# command-line-arguments
/tmp/go-build893064114/command-line-arguments/_obj/leveldblib.cgo2.o: In function `_cgo_793b887390dd_Cfunc_leveldb_open':
./leveldblib.go:60: undefined reference to `leveldb_open'

[Prajakta Dandawate]

Hello All,

Can anyone help me build the go code, with leveldb static C library 

I was able to build and test the go code to use leveldb dynamic library.

I get following messages ( a lot of them ) while building

# command-line-arguments

/root/Desktop/leveldb-master/libleveldb.a(c.o): In function `leveldb_writeoptions_create':

c.cc:(.text+0x45a): undefined reference to `operator new(unsigned long)'

/root/Desktop/leveldb-master/libleveldb.a(c.o): In function `leveldb_readoptions_create':

c.cc:(.text+0x47a): undefined reference to `operator new(unsigned long)'

My go code looks like -

package leveldb

/*

#cgo CFLAGS: -I/root/Desktop/leveldb-master/include/leveldb

#cgo LDFLAGS: /root/Desktop/leveldb-master/libleveldb.a

#include <stdlib.h>

#include "c.h"

*/

Regards

Prajakta