The First Step for Building Groonga Bindings with Golang

͸͡Ίͯͷ 
(SPPOHBCJOEJOHͮ͘Γ
ઃᒜ༸࣐ 
!EBSBTIJ
(PͰମݧ
5IFNBTDPUXBTEFTJHOFECZ3FOÉF'SFODI 
-JDFOTFEVOEFS$$#:
શจݕࡧΤϯδϯ(SPPOHBษڧձˏࡳຈ 
ࡳຈࢢຽϗʔϧୈձٞࣨ
— The First Step for Building Groonga Bindings with Golang

View Slide

5IFNBTDPUXBTEFTJHOFECZ3FOÉF'SFODI 
-JDFOTFEVOEFS$$#:

View Slide

8IZ(P
w DHPΛ࢖͏ͱ$ͷίʔυΛखܰʹݺ΂Δ
w HPSVOͰ͘͘͞͞ࢼͤΔ
w ָ͍͠ ࣗ෼͕

View Slide

(Pʔϧ
(P͔Β(SPPOHBΛ৮ΔϥΠϒϥϦΛ࡞Δ

View Slide

(Pʔϧ
(P͔Β(SPPOHBΛ৮ΔϥΠϒϥϦΛ࡞Δ 
ʜͨΊͷୈҰาΛ౿Έग़͢

View Slide

΍Βͳ͍͜ͱ
w ϥΠϒϥϦͱͯ͠៉ྷʹ੔͑Δ
w େ൒ͷΤϥʔॲཧ
w ΫΤϦʔݴޠΛհ͞ͳ͍ 
௿Ϩϕϧͳ(SPPOHB"1*ͷར༻

View Slide

Groonga2013 Powered by Rabbit 2.1.2
Groonga
libgroonga
gqtp
_
`a bcd e
fBg
e
fh
Bij

kQ
groonga
l
API
HTTP
SQL
CLI
,PIFJ4VUP l(SPPOHB଒zIUUQTMJEFSBCCJUTIPDLFSPSHBVUIPSTLPVHSPPOHBOJHIU$$#:4"

View Slide

Groonga
libgroonga
gqtp
_
`a bcd e
fBg
e
fh
Bij

kQ
groonga
l
API
HTTP
SQL
CLI
͔͜͜Β 
࢖͏

View Slide

HSPPOHBίϚϯυ

View Slide

$ groonga 
> status
[[0,1395981744.74587,3.814697265625e-05],
{"alloc_count":151,"starttime":
1395981645,"uptime":
99,"version":"4.0.0","n_queries":
0,"cache_hit_rate":0.0,"command_version":
1,"default_command_version":
1,"max_command_version":2}]

View Slide

Groonga
libgroonga
gqtp
_
`a bcd e
fBg
e
fh
Bij

kQ
groonga
l
API
HTTP
SQL
CLI
ࠓͷ͸ 
$-*

View Slide

ඞཁͳ"1*

View Slide

͜Θ͘ͳ͍
w ࢝·ΓͱऴΘΓ 
[email protected]
[email protected]

w ίϯςΩετ [email protected]
ͷ࡞੒ͱഁغ 
[email protected]@JOJU
[email protected]@pO

w σʔλϕʔεͷ࡞੒ɾΦʔϓϯͱΫϩʔζ 
[email protected]@DSFBUF
[email protected]@PQFO
[email protected]@DMPTF

w ίϚϯυͷૹ৴ͱड৴ 
[email protected]@TFOE
[email protected]@SFDW

View Slide

͸͡ΊͷҰา

View Slide

લఏ
w (P͕Πϯετʔϧ͞Ε͍ͯΔ
w (SPPOHB͕Πϯετʔϧ͞Ε͍ͯΔ
w QLHDPOpH͕(SPPOHBΛݟ͚ͭΒΕΔ

View Slide

package main
!
/*
#cgo pkg-config: groonga
#include
*/
import "C"
!
func main() {
}

View Slide

$ go run main.go
$
ʮԿ΋͠ͳ͍ʯΛͨ͠

View Slide

(SPPOHBϥΠϒϥϦͷ 
ॳظԽͱ։์

View Slide

'
'
(
(
)
)
*
*
#
#
,
, ﬁle
ﬁle 349 lines (221 sloc)
349 lines (221 sloc) 12.16 kb
12.16 kb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
=,groonga,C,API,ϚχϡΞϧ
groongaͷCݴޠAPI͸ɺ1)ڞ௨APIɺ2)QL,APIɺ3)DB,APIɺ4)௿ϨϕϧAPIͷ4छʹେผ͞ΕΔɻ
ڞ௨API͸ଞͷશͯͷAPIͱ૊Έ߹Θͤͯڞ௨ʹ࢖༻͞ΕΔɻ࢒Γͷ3छͷAPI͸֊૚ߏ଄Λͳ͍ͯ͠Δɻ
QL,API͸࠷΋্ҐʹҐஔ͠ɺquery,languageΛհͯ͠σʔλετΞΛૢ࡞͢ΔػೳΛఏڙ͢Δɻ
DB,API͸QL,APIͷԼҐʹҐஔ͠ɺσʔλετΞΛߏ੒͢Δ֤ΦϒδΣΫτΛૢ࡞͢ΔػೳΛఏڙ͢Δɻ
௿ϨϕϧAPI͸DB,APIͷ͞ΒʹԼҐʹҐஔ͠ɺσʔλΦϒδΣΫτͷߏ੒ཁૉΛ௚઀ૢ࡞͢ΔػೳΛఏڙ͢Δɻ
=,ڞ௨API
==,grn_init
:NAME
,,grn_init,,grn_fin,I,groongaϥΠϒϥϦΛॳظԽ/ղ์͢Δ
:SYNOPSIS
,((','))
,,#include,
,,grn_rc,grn_init(void);
,,grn_rc,grn_fin(void);
:DESCRIPTION
,,grn_init()͸ɺlibgroonga͕ඞཁͱ͢ΔࢿݯͷॳظԽΛߦ͏ɻlibgroongaΛ࢖༻͢ΔϓϩάϥϜ͸ଞͷgroonga,APIؔ਺Λݺͼग़͢લʹҰ౓͚ͩgrn_init()Λݺͼग़͞ͳ͚
,,grn_fin()͸libgroonga͕࢖༻͢ΔࢿݯΛղ์͢Δɻgrn_fin()࣮ߦޙʹgroonga,APIؔ਺Λ࣮ߦͯ͠͸ͳΒͳ͍ɻ
:RETURN,VALUE
,,੒ޭͨ͠৔߹͸GRN_SUCCESSΛฦ͢ɻ
,,grn_init()͸ɺࢿݯͷ֬อʹࣦഊͨ͠৔߹ʹGRN_NO_MEMORY_AVAILABLEΛฦ͢ɻ
:NOTES
,,grn_init(),,grn_fin()͸ϦΤϯτϥϯτͰ͸ͳ͍ɻͦͷଞͷgroongaͷC,APIؔ਺͸શͯϦΤϯτϥϯτͰ͋Δɻ
-
-
- Open
Open
Open Edit
Edit
Edit Raw
Raw Blame
Blame History
History Delete
Delete
IUUQTHJUIVCDPNHSPPOHBHSPPOHBCMPCNBTUFSEPD"1*SE

View Slide

package main
!
/*
#include
*/
import "C"
!
func main() {
C.grn_init() // TODO error handling
defer C.grn_fin() // TODO error handling
}
NBJO
͕ऴΘΔͱ͖ʹ࣮ߦ͢Δ

View Slide

ίϯςΩετͷ 
࡞੒ͱഁغ

View Slide

ʜίϯςΩετͬͯԿ

View Slide

[email protected]

View Slide

39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
==,grn_ctx_init
:NAME
,,grn_ctx_init,,grn_ctx_fin,I,grn_ctxߏ଄ମΛॳظԽ/ղ์͢Δ
:SYNOPSIS
,((','))
,,#include,
,,grn_rc,grn_ctx_init(grn_ctx,*ctx,,int,flags,,grn_encoding,encoding);
,,grn_rc,grn_ctx_fin(grn_ctx,*ctx);
:DESCRIPTION
,,grn_ctx͸ɺ1)Τϥʔ৘ใͷ௨஌ɺ2)API಺෦Ͱ࢖༻͢ΔϝϞϦͷ؅ཧɺ3)ΫΤϦݴޠॲཧܥͷ؅ཧͷͨΊʹ࢖༻͞ΕΔߏ଄ମͰ͋Δɻ΄ͱΜͲͷAPIؔ਺͸ୈҰҾ਺ʹgrn_ct
,,,typedef,struct,_grn_ctx,grn_ctx;
,,,struct,_grn_ctx,{
,,,,,grn_rc,rc;,,,,,,,,,,,,,,,,,,,,,,,/*,࠷ޙʹ࣮ߦͨ͠APIͷऴྃίʔυ,*/
,,,,,int,flags;,,,,,,,,,,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,grn_encoding,encoding;,,,,,,,,,,,/*,σϑΥϧτͷจࣈΤϯίʔσΟϯά,*/
,,,,,unsigned,char,ntrace;,,,,,,,,,,,,/*,όοΫτϨʔεͷ਺,*/
,,,,,unsigned,char,errlvl;,,,,,,,,,,,,/*,࠷ޙʹൃੜͨ͠ΤϥʔͷϨϕϧ,*/
,,,,,unsigned,char,stat;,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,unsigned,int,seqno;,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,unsigned,int,subno;,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,unsigned,int,seqno2;,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,unsigned,int,errline;,,,,,,,,,,,,/*,Τϥʔ͕ൃੜͨ͠Օॴͷߦ൪߸,*/
,,,,,grn_ctx,*prev;,,,,,,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,grn_ctx,*next;,,,,,,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,const,char,*errfile;,,,,,,,,,,,,,/*,Τϥʔ͕ൃੜͨ͠ιʔεϑΝΠϧ໊,*/
,,,,,const,char,*errfunc;,,,,,,,,,,,,,/*,Τϥʔ͕ൃੜͨؔ͠਺໊,*/
,,,,,struct,_grn_ctx_impl,*impl;,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,void,*trace[16];,,,,,,,,,,,,,,,,,/*,όοΫτϨʔεϙΠϯλ഑ྻ,*/
,,,,,char,errbuf[GRN_CTX_MSGSIZE];,,,,/*,࠷ޙʹൃੜͨ͠Τϥʔʹؔ͢Δϝοηʔδ,*/
,,,};
,,grn_ctxߏ଄ମ͸APIͰ࢖༻͢Δલʹgrn_ctx_init()ͰॳظԽ͠ͳ͚Ε͹ͳΒͳ͍ɻॳظԽ͢Δgrn_ctxߏ଄ମ΁ͷϙΠϯλΛ'ctx'ʹࢦఆ͢Δɻ'flags'ʹGRN_CTX_USE_QL

View Slide

[email protected]
ͬͪ͜Λ࢖ͬͯΈ·͢
[email protected]@JOJUͰ͸ͳ͘

View Slide

package main
!
/*
#include
#include
*/
import "C"
!
func main() {
!
ctx := C.grn_ctx_open(0)
defer C.grn_ctx_fin(ctx) // TODO error handling
}
qBHT͸ͱΓ͋͑ͣͰ

View Slide

σʔλϕʔεΛ 
ͭ͘Δɾͱ͡Δ

View Slide

It is used for specifying options for grn_db_create().
char **grn_db_create_optarg.builtin_type_names
૊ΈࠐΈܕͷ໊લͱͳΔnulऴ୺จࣈྻͷ഑ྻΛࢦఆ͢Δɻ
int grn_db_create_optarg.n_builtin_type_names
n_builtin_type_namesʹ͸ɺoptarg.builtin_type_namesͰࢦఆ͢Δจࣈྻͷ਺Λ ࢦఆ͢Δɻ഑
ྻͷoffset͸enumܕgrn_builtin_typeͷ஋ʹରԠ͢Δɻ
grn_obj *grn_db_create(grn_ctx *ctx, const char *path, grn_db_create_optarg *optarg)
৽ͨͳdbΛ࡞੒͠·͢ɻ
ύ
ϥ
ϝ
λ:
ctx -- ॳظԽࡁΈͷ grn_ctx Λࢦఆ͠·͢ɻ
path -- ࡞੒͢ΔdbΛ֨ೲ͢ΔϑΝΠϧύεΛࢦఆ͠·͢ɻNULLͳΒtemporary db
ͱͳΓ·͢ɻNULLҎ֎ͷύεΛࢦఆͨ͠৔߹͸persistent dbͱͳΓ·͢ɻ
optarg --
Currently, it is not used. It is just ignored.
࡞੒͢Δdbͷ૊ΈࠐΈܕͷ໊લΛมߋ͢Δ࣌ʹࢦఆ͠·͢ɻ
optarg.builtin_type_namesʹ͸ɺ૊ΈࠐΈܕͷ໊લͱͳΔnullऴ୺จࣈྻͷ഑ྻΛࢦ
ఆ͠·͢ɻoptarg.n_builtin_type_namesʹ͸ɺoptarg.builtin_type_namesͰࢦఆ͢Δจ
ࣈྻͷ਺Λࢦఆ͠·͢ɻ഑ྻͷoffset͸enumܕgrn_builtin_typeͷ஋ʹରԠ͠·͢ɻ
grn_obj *grn_db_open(grn_ctx *ctx, const char *path)
طଘͷdbΛ։͖·͢ɻ
ύϥϝλ: path -- ։͜͏ͱ͢ΔdbΛ֨ೲ͢ΔϑΝΠϧύεΛࢦఆ͠·͢ɻ
void grn_db_touch(grn_ctx *ctx, grn_obj *db)
dbͷ಺༰ͷ࠷ऴߋ৽࣌ࠁΛݱࡏ࣌ࠁʹ͠·͢ɻ
࠷ऴߋ৽࣌ࠁ͸Ωϟογϡ͕༗ޮ͔Ͳ͏͔ͷ൑அͳͲʹར༻͞Ε·͢ɻ
ύϥϝλ: db -- ಺༰͕มߋ͞ΕͨdbΛࢦఆ͠·͢ɻ
grn_obj *grn_obj_db(grn_ctx *ctx, grn_obj *obj)
objͷଐ͢ΔdbΛฦ͠·͢ɻ
ύϥϝλ: obj -- ର৅objectΛࢦఆ͠·͢ɻ
ϞδϡʔϧɺΫϥεɺ·ͨ͸ؔ਺໊
Λೖྗ͍ͯͩ͘͠͞
[email protected]
طଘͷ%#Λ։͘ͱ͖͸͜Ε
͜ΕΛ࢖͍·͢

View Slide

package main
!
/*
#include
#include
*/
import "C"
import "unsafe"
!
func main() {
!
!
dbPath := "db"
cDbPath := C.CString(dbPath)
defer C.free(unsafe.Pointer(cDbPath))
db := C.grn_db_create(ctx, cDbPath, nil)
if db == nil {
log.Fatal("[grn_db_create] Failed to create DB")
}
defer C.grn_obj_close(ctx, db)
}
EC1BUIΛ$ͷจࣈྻʹ͠·͢

View Slide

import "fmt"
func main() {
f := C.intFunc(C.fortytwo)
fmt.Println(int(C.bridge_int_func(f)))
// Output: 42
}
In C, a function argument written as a fixed size array actually requires a pointer to the first element of the array. C compilers are
aware of this calling convention and adjust the call accordingly, but Go cannot. In Go, you must pass the pointer to the first element
explicitly: C.f(&x[0]).
A few special functions convert between Go and C types by making copies of the data. In pseudo-Go definitions:
// Go string to C string
// The C string is allocated in the C heap using malloc.
// It is the caller's responsibility to arrange for it to be
// freed, such as by calling C.free (be sure to include stdlib.h
// if C.free is needed).
func C.CString(string) *C.char
// C string to Go string
func C.GoString(*C.char) string
// C string, length to Go string
func C.GoStringN(*C.char, C.int) string
// C pointer, length to Go []byte
func C.GoBytes(unsafe.Pointer, C.int) []byte
C references to Go
Go functions can be exported for use by C code in the following way:
//export MyFunction
func MyFunction(arg1, arg2 int, arg3 string) int64 {...}
//export MyFunction2
func MyFunction2(arg1, arg2 int, arg3 string) (int64, *C.char) {...} IUUQHPMBOHPSHDNEDHP

View Slide

͓͘Δ

View Slide

265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
==,grn_ctx_send
:NAME
,,grn_ctx_send,I,͓͘Δ
:SYNOPSIS
,((','))
,,#include,
,,unsigned,grn_ctx_send(grn_ctx,*ctx,,char,*str,,unsigned,int,str_len,,int,flags);
:DESCRIPTION
,,͓͘Δ
==,grn_ctx_recv
:NAME
,,grn_ctx_recv,I,͏͚ͱΔ
:SYNOPSIS
,((','))
,,#include,
,,unsigned,grn_ctx_recv(grn_ctx,*ctx,,char,**str,,unsigned,int,*str_len,,int,*flags);
:DESCRIPTION
,,͏͚ͱΔ
=,DB,API
==,grn_db_create
:NAME
,,grn_db_create,,grn_db_open,I,σʔλϕʔεΛੜ੒͢Δ

View Slide

package main
!
/*
#include
#include
*/
import "C"
import "unsafe"
!
func main() {
!
!
dbPath := "db"
if db == nil {
}
!
command := "status"
cCommand := C.CString(command)
defer C.free(unsafe.Pointer(cCommand))
C.grn_ctx_send(ctx, cCommand, C.uint(len(command)), 0) // TODO error handling
}
DPNNBOEΛ$ͷจࣈྻʹ͠·͢
ίϚϯυ௕ qBHT͸ͱΓ͋͑ͣͰ

View Slide

͏͚ͱΔ

View Slide

265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
==,grn_ctx_send
:NAME
,,grn_ctx_send,I,͓͘Δ
:SYNOPSIS
,((','))
,,#include,
,,unsigned,grn_ctx_send(grn_ctx,*ctx,,char,*str,,unsigned,int,str_len,,int,flags);
:DESCRIPTION
,,͓͘Δ
==,grn_ctx_recv
:NAME
,,grn_ctx_recv,I,͏͚ͱΔ
:SYNOPSIS
,((','))
,,#include,
,,unsigned,grn_ctx_recv(grn_ctx,*ctx,,char,**str,,unsigned,int,*str_len,,int,*flags);
:DESCRIPTION
,,͏͚ͱΔ
=,DB,API
==,grn_db_create
:NAME
,,grn_db_create,,grn_db_open,I,σʔλϕʔεΛੜ੒͢Δ

View Slide

package main
!
/*
#include
#include
*/
import "C"
import "unsafe"
import "log"
!
func main() {
!
!
dbPath := "db"
if db == nil {
}
!
command := "status"
!
var resultBuffer *C.char
var resultLength C.uint
var flags C.int
C.grn_ctx_recv(ctx, &resultBuffer, &resultLength, &flags) // TODO error handling
result := C.GoBytes(unsafe.Pointer(resultBuffer), C.int(resultLength))
!
log.Println(string(result))
}

View Slide

Ͱ͖ͨ

View Slide

$ go run main.go
2014/03/28 15:34:38 {"alloc_count":
156,"starttime":1395988478,"uptime":
0,"version":"4.0.0","n_queries":
0,"cache_hit_rate":0.0,"command_version":
1,"default_command_version":
1,"max_command_version":2}

View Slide

͜Θ͘ͳ͍
w ࢝·ΓͱऴΘΓ 
[email protected]
[email protected]

w ίϯςΩετ [email protected]
ͷ࡞੒ͱഁغ 
[email protected]@JOJU
[email protected]@pO

w σʔλϕʔεͷ࡞੒ɾΦʔϓϯͱΫϩʔζ 
[email protected]@DSFBUF
[email protected]@PQFO
[email protected]@DMPTF

w ίϚϯυͷૹ৴ͱड৴ 
[email protected]@TFOE
[email protected]@SFDW

View Slide

Τϥʔॲཧʹ͍ͭͯ
͢͜͠

View Slide

[email protected]

View Slide

;ͨͭͷΤϥʔ
w ݺͼग़ͨ͠[email protected]͕໭Γ஋ͰΤϥʔΛڭ͑ͯ͘ΕΔ
৔߹
w ݺͼग़͠͸੒ޭͨ͠΋ͷͷɺ࣮ߦʹ͸ࣦഊͯ͠ίϯ
ςΩετʹΤϥʔ͕ೖΔ৔߹

View Slide

39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
==,grn_ctx_init
:NAME
,,grn_ctx_init,,grn_ctx_fin,I,grn_ctxߏ଄ମΛॳظԽ/ղ์͢Δ
:SYNOPSIS
,((','))
,,#include,
,,grn_rc,grn_ctx_init(grn_ctx,*ctx,,int,flags,,grn_encoding,encoding);
,,grn_rc,grn_ctx_fin(grn_ctx,*ctx);
:DESCRIPTION
,,grn_ctx͸ɺ1)Τϥʔ৘ใͷ௨஌ɺ2)API಺෦Ͱ࢖༻͢ΔϝϞϦͷ؅ཧɺ3)ΫΤϦݴޠॲཧܥͷ؅ཧͷͨΊʹ࢖༻͞ΕΔߏ଄ମͰ͋Δɻ΄ͱΜͲͷAPIؔ਺͸ୈҰҾ਺ʹgrn_ct
,,,typedef,struct,_grn_ctx,grn_ctx;
,,,struct,_grn_ctx,{
,,,,,grn_rc,rc;,,,,,,,,,,,,,,,,,,,,,,,/*,࠷ޙʹ࣮ߦͨ͠APIͷऴྃίʔυ,*/
,,,,,int,flags;,,,,,,,,,,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,grn_encoding,encoding;,,,,,,,,,,,/*,σϑΥϧτͷจࣈΤϯίʔσΟϯά,*/
,,,,,unsigned,char,ntrace;,,,,,,,,,,,,/*,όοΫτϨʔεͷ਺,*/
,,,,,unsigned,char,errlvl;,,,,,,,,,,,,/*,࠷ޙʹൃੜͨ͠ΤϥʔͷϨϕϧ,*/
,,,,,unsigned,char,stat;,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,unsigned,int,seqno;,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,unsigned,int,subno;,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,unsigned,int,seqno2;,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,unsigned,int,errline;,,,,,,,,,,,,/*,Τϥʔ͕ൃੜͨ͠Օॴͷߦ൪߸,*/
,,,,,grn_ctx,*prev;,,,,,,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,grn_ctx,*next;,,,,,,,,,,,,,,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,const,char,*errfile;,,,,,,,,,,,,,/*,Τϥʔ͕ൃੜͨ͠ιʔεϑΝΠϧ໊,*/
,,,,,const,char,*errfunc;,,,,,,,,,,,,,/*,Τϥʔ͕ൃੜͨؔ͠਺໊,*/
,,,,,struct,_grn_ctx_impl,*impl;,,,,,,/*,಺෦ॲཧ༻,*/
,,,,,void,*trace[16];,,,,,,,,,,,,,,,,,/*,όοΫτϨʔεϙΠϯλ഑ྻ,*/
,,,,,char,errbuf[GRN_CTX_MSGSIZE];,,,,/*,࠷ޙʹൃੜͨ͠Τϥʔʹؔ͢Δϝοηʔδ,*/
,,,};
,,grn_ctxߏ଄ମ͸APIͰ࢖༻͢Δલʹgrn_ctx_init()ͰॳظԽ͠ͳ͚Ε͹ͳΒͳ͍ɻॳظԽ͢Δgrn_ctxߏ଄ମ΁ͷϙΠϯλΛ'ctx'ʹࢦఆ͢Δɻ'flags'ʹGRN_CTX_USE_QL

View Slide

package main
!
/*
#include
#include
*/
import "C"
import "unsafe"
import "log"
!
func main() {
!
!
dbPath := "db"
if db == nil {
}
!
command := "status"
!
var flags C.int
!
}
ݺͼग़ͨ͠[email protected]͕໭Γ஋Ͱ 
ΤϥʔΛڭ͑ͯ͘ΕΔ৔߹ 
࣮͸DUYSD΋(3/@46$$&44ʹͳ͍ͬͯΔ

View Slide

package main
!
/*
#include
#include
*/
import "C"
import "unsafe"
import "log"
!
func main() {
!
!
dbPath := "db"
if db == nil {
}
!
command := "status"
!
var flags C.int
!
}
[email protected]@TFOEʹண໨

View Slide

ݺͼग़ͨ͠[email protected]͕໭Γ஋Ͱ 
ΤϥʔΛڭ͑ͯ͘ΕΔ৔߹
/* ུ */
!
command := "statussssss"
rc := C.grn_ctx_send(ctx, cCommand, C.uint(len(command)), 0)
if rc != C.GRN_SUCCESS {
log.Fatal("[grn_ctx_send(rc)]")
}
if ctx.rc != C.GRN_SUCCESS {
message := C.GoString(&ctx.errbuf[0])
log.Fatal("[grn_ctx_send(ctx.rc)] ", message)
}
!
/* ུ */
ݺͼग़͠͸੒ޭͨ͠΋ͷͷɺ 
࣮ߦʹ͸ࣦഊͯ͠ίϯςΩετʹΤϥʔ͕ೖΔ৔߹
UZQPͨ͠

View Slide

$ go run main.go
2014/03/29 13:07:45 [grn_ctx_send(ctx.rc)]
invalid command name: statussssss
exit status 1

View Slide

l͜Μ͝ͷ͔͍ͩz

View Slide

ϥΠϒϥϦͱͯ͠੔͑Δ
w %#ΛͻΒ͘৔߹ɺͭ͘Δ৔߹ͷ྆ํʹରԠ
w (PSPVUJOFͱεϨουͱ[email protected]Λ஥ྑ͘
w Τϥʔͷॲཧ
w ࣗಈԽςετ
w ೖग़ྗΛ(PͰѻ͍қ͍ܗࣜʹ

View Slide

·ͱΊ

View Slide

·ͱΊ
w (PͰ(SPPOHBCJOEJOHΛͭ͘ΔͨΊͷ 
ୈҰาΛ঺հͨ͠
w (SPPOHBCJOEJOHͱͯ͠࢖͑Δ΋ͷʹ͢ΔͨΊʹ
ඞཁͳ࡞ۀΛࣔͨ͠

View Slide

The First Step for Building Groonga Bindings with Golang

The First Step for Building Groonga Bindings with Golang

Yoji Shidara

More Decks by Yoji Shidara

Other Decks in Technology

Featured

Transcript