├── .gitignore
├── LICENSE
├── Makefile
├── README.md
├── module.go
└── mytrigger.go


/.gitignore:
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1 | ptgo.h
2 | ptgo.so
3 | 
4 | 


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/LICENSE:
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 1 | 
 2 | ptgo - PostgreSQL Triggers in Go
 3 | 
 4 | Copyright (c) 2017 RapidLoop
 5 | 
 6 | Permission is hereby granted, free of charge, to any person obtaining a copy
 7 | of this software and associated documentation files (the "Software"), to deal
 8 | in the Software without restriction, including without limitation the rights
 9 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 | copies of the Software, and to permit persons to whom the Software is
11 | furnished to do so, subject to the following conditions:
12 | 
13 | The above copyright notice and this permission notice shall be included in
14 | all copies or substantial portions of the Software.
15 | 
16 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 | THE SOFTWARE.
23 | 
24 | 


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/Makefile:
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1 | 
2 | SRC := $(wildcard *.go)
3 | 
4 | export CGO_CFLAGS = -I$(shell pg_config --includedir-server)
5 | 
6 | build: $(SRC)
7 | 	go build -o ptgo.so -buildmode=c-shared $(SRC)
8 | 
9 | 


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/README.md:
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 1 | # PostgreSQL Triggers in Go
 2 | 
 3 | `ptgo` is an example of how to write PostgreSQL triggers in Go. Fork it and use
 4 | it to implement your own triggers!
 5 | 
 6 | Check out the [blog post](https://www.opsdash.com/blog/postgresql-triggers-golang.html)
 7 | for a description of ptgo internals.
 8 | 
 9 | Follow us on Twitter today! [@therapidloop](https://twitter.com/therapidloop)
10 | 
11 | 


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/module.go:
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 1 | package main
 2 | 
 3 | /*
 4 | #include "postgres.h"
 5 | #include "fmgr.h"
 6 | 
 7 | #cgo LDFLAGS: -Wl,--unresolved-symbols=ignore-all
 8 | 
 9 | #ifdef PG_MODULE_MAGIC
10 | PG_MODULE_MAGIC;
11 | #endif
12 | 
13 | PG_FUNCTION_INFO_V1(mytrigger);
14 | */
15 | import "C"
16 | 
17 | func main() {
18 | }
19 | 


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/mytrigger.go:
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 1 | package main
 2 | 
 3 | /*
 4 | #include "postgres.h"
 5 | #include "commands/trigger.h"
 6 | #include "utils/elog.h"
 7 | #include "utils/rel.h"
 8 | #include "access/htup_details.h"
 9 | 
10 | static int trigger_fired_by_update(TriggerEvent tg_event) {
11 | 	return (TRIGGER_FIRED_BY_UPDATE(tg_event)) != 0;
12 | }
13 | 
14 | static Datum pointer_get_datum(HeapTuple t) {
15 | 	return PointerGetDatum(t);
16 | }
17 | 
18 | static char *getarg_text(TriggerData *trigdata, HeapTuple rettuple, int idx) {
19 | 	bool isnull;
20 | 	TupleDesc tupdesc = trigdata->tg_relation->rd_att;
21 | 	text * t = DatumGetTextP(heap_getattr(rettuple, idx, tupdesc, &isnull));
22 | 	if (isnull || !t) {
23 | 		return "";
24 | 	}
25 | 	return VARDATA(t);
26 | }
27 | 
28 | static void elog_info(char *s) {
29 | 	elog(INFO, "%s", s);
30 | }
31 | 
32 | */
33 | import "C"
34 | import (
35 | 	"fmt"
36 | 	"unsafe"
37 | )
38 | 
39 | //export mytrigger
40 | func mytrigger(fcInfo *C.FunctionCallInfoData) C.Datum {
41 | 	trigdata := (*C.TriggerData)(unsafe.Pointer(fcInfo.context))
42 | 
43 | 	var rettuple *C.HeapTupleData
44 | 	if C.trigger_fired_by_update(trigdata.tg_event) != 0 {
45 | 		rettuple = (*C.HeapTupleData)(trigdata.tg_newtuple)
46 | 	} else {
47 | 		rettuple = (*C.HeapTupleData)(trigdata.tg_trigtuple)
48 | 	}
49 | 
50 | 	url := C.GoString(C.getarg_text(trigdata, rettuple, 1))
51 | 
52 | 	C.elog_info(C.CString(fmt.Sprintf("got url=%s", url)))
53 | 	fmt.Println(url)
54 | 
55 | 	return C.pointer_get_datum(rettuple)
56 | }
57 | 


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