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wasm.go
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wasm.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
//go:build js && wasm
// +build js,wasm
package main
import (
"encoding/json"
"syscall/js"
"github.com/andrewkroh/go-sawmill/pkg/event"
"github.com/andrewkroh/go-sawmill/pkg/pipeline"
// Register
_ "github.com/andrewkroh/go-sawmill/pkg/processor/lowercase"
)
func process(this js.Value, args []js.Value) interface{} {
if len(args) != 2 {
return "pipeline_execute requires two args"
}
pipelineJSON := args[0].String()
eventJSON := args[1].String()
var pipelineConfig *pipeline.Config
if err := json.Unmarshal([]byte(pipelineJSON), &pipelineConfig); err != nil {
return "failed to unmarshal pipeline: " + err.Error()
}
pipe, err := pipeline.New(pipelineConfig)
if err != nil {
return "failed to create new pipeline: " + err.Error()
}
var event *event.Event
if err = json.Unmarshal([]byte(eventJSON), &event); err != nil {
return "failed to unmarshal event JSON: " + err.Error()
}
out, err := pipe.Process(event)
if err != nil {
return "failed to process event: " + err.Error()
}
return toObject(out)
}
// toObject converts a struct to a map[string]interface{} using JSON
// marshal/unmarshal.
func toObject(v interface{}) map[string]interface{} {
data, err := json.Marshal(v)
if err != nil {
panic(err)
}
var out map[string]interface{}
if err = json.Unmarshal(data, &out); err != nil {
panic(err)
}
return out
}
func registerCallbacks() {
js.Global().Set("pipeline_execute", js.FuncOf(process))
}
func main() {
println("Pipeline WASM Demo loaded.")
println("Invoke the pipeline_execute(pipeline_json, input_event_json) function to test.")
registerCallbacks()
<-make(chan bool)
}