1 files changed, 41 insertions, 0 deletions
diff --git a/fluent-bit/examples/filter_wasm_go/filter.go b/fluent-bit/examples/filter_wasm_go/filter.go
new file mode 100644
index 000000000..fe7303c68
--- /dev/null
+++ b/fluent-bit/examples/filter_wasm_go/filter.go
@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"time"
+	"unsafe"
+
+	"github.com/valyala/fastjson"
+)
+
+//export go_filter
+func go_filter(tag *uint8, tag_len uint, time_sec uint, time_nsec uint, record *uint8, record_len uint) *uint8 {
+	btag := unsafe.Slice(tag, tag_len)  // Note, requires Go 1.17 (tinygo 0.20)
+	brecord := unsafe.Slice(record, record_len)
+	now := time.Unix(int64(time_sec), int64(time_nsec))
+
+	br := string(brecord)
+	var p fastjson.Parser
+	value, err := p.Parse(br)
+	if err != nil {
+		fmt.Println(err)
+		return nil
+	}
+	obj, err := value.Object()
+	if err != nil {
+		fmt.Println(err)
+		return nil
+	}
+
+	var arena fastjson.Arena
+	obj.Set("time", arena.NewString(now.String()))
+	obj.Set("tag", arena.NewString(string(btag)))
+	obj.Set("original", arena.NewString(br))
+	s := obj.String()
+	s += string(rune(0)) // Note: explicit null terminator.
+	rv := []byte(s)
+
+	return &rv[0]
+}
+
+func main() {}