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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package ndjson
import (
"encoding/json"
"io"
"log"
"os"
"sync"
"time"
"github.com/philippta/flyscrape"
)
func init() {
flyscrape.RegisterModule(Module{})
}
type Module struct {
Output struct {
Format string `json:"format"`
File string `json:"file"`
} `json:"output"`
w io.WriteCloser
mu *sync.Mutex
}
func (Module) ModuleInfo() flyscrape.ModuleInfo {
return flyscrape.ModuleInfo{
ID: "output.ndjson",
New: func() flyscrape.Module { return new(Module) },
}
}
func (m *Module) Provision(ctx flyscrape.Context) {
if m.disabled() {
return
}
m.mu = &sync.Mutex{}
if m.Output.File == "" {
m.w = nopCloser{os.Stdout}
return
}
f, err := os.Create(m.Output.File)
if err != nil {
log.Printf("failed to create file %q: %v", m.Output.File, err)
os.Exit(1)
}
m.w = f
}
func (m *Module) ReceiveResponse(resp *flyscrape.Response) {
if m.disabled() {
return
}
if resp.Error == nil && resp.Data == nil {
return
}
o := output{
URL: resp.Request.URL,
Data: resp.Data,
Timestamp: time.Now(),
}
if resp.Error != nil {
o.Error = resp.Error.Error()
}
m.mu.Lock()
defer m.mu.Unlock()
enc := json.NewEncoder(m.w)
enc.SetEscapeHTML(false)
enc.Encode(o)
}
func (m *Module) Finalize() {
if m.disabled() {
return
}
m.w.Close()
}
func (m *Module) disabled() bool {
return m.Output.Format != "ndjson"
}
type output struct {
URL string `json:"url,omitempty"`
Data any `json:"data,omitempty"`
Error string `json:"error,omitempty"`
Timestamp time.Time `json:"timestamp,omitempty"`
}
type nopCloser struct {
io.Writer
}
func (c nopCloser) Write(p []byte) (n int, err error) {
return c.Writer.Write(p)
}
func (c nopCloser) Close() error {
return nil
}
var (
_ flyscrape.Provisioner = (*Module)(nil)
_ flyscrape.ResponseReceiver = (*Module)(nil)
_ flyscrape.Finalizer = (*Module)(nil)
)
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