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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 flyscrape
import (
"fmt"
"log"
"net/http"
"os"
"os/signal"
"path/filepath"
"syscall"
"github.com/inancgumus/screen"
"github.com/tidwall/sjson"
)
func Run(file string, overrides map[string]any) error {
src, err := os.ReadFile(file)
if err != nil {
return fmt.Errorf("failed to read script %q: %w", file, err)
}
client := &http.Client{}
imports, wait := NewJSLibrary(client)
defer wait()
exports, err := Compile(string(src), imports)
if err != nil {
return fmt.Errorf("failed to compile script: %w", err)
}
cfg := exports.Config()
cfg = updateCfgMultiple(cfg, overrides)
scraper := NewScraper()
scraper.ScrapeFunc = exports.Scrape
scraper.SetupFunc = exports.Setup
scraper.Script = file
scraper.Client = client
scraper.Modules = LoadModules(cfg)
scraper.Run()
return nil
}
func Dev(file string, overrides map[string]any) error {
cachefile, err := newCacheFile()
if err != nil {
return fmt.Errorf("failed to create cache file: %w", err)
}
trapsignal(func() {
os.RemoveAll(cachefile)
})
fn := func(s string) error {
client := &http.Client{}
imports, wait := NewJSLibrary(client)
defer wait()
exports, err := Compile(s, imports)
if err != nil {
printCompileErr(file, err)
return nil
}
cfg := exports.Config()
cfg = updateCfgMultiple(cfg, overrides)
cfg = updateCfg(cfg, "depth", 0)
cfg = updateCfg(cfg, "cache", "file:"+cachefile)
scraper := NewScraper()
scraper.ScrapeFunc = exports.Scrape
scraper.SetupFunc = exports.Setup
scraper.Script = file
scraper.Client = client
scraper.Modules = LoadModules(cfg)
screen.Clear()
screen.MoveTopLeft()
scraper.Run()
return nil
}
if err := Watch(file, fn); err != nil && err != StopWatch {
return fmt.Errorf("failed to watch script %q: %w", file, err)
}
return nil
}
func printCompileErr(script string, err error) {
screen.Clear()
screen.MoveTopLeft()
if errs, ok := err.(interface{ Unwrap() []error }); ok {
for _, err := range errs.Unwrap() {
log.Printf("%s:%v\n", script, err)
}
} else {
log.Println(err)
}
}
func updateCfg(cfg Config, key string, value any) Config {
newcfg, err := sjson.Set(string(cfg), key, value)
if err != nil {
return cfg
}
return Config(newcfg)
}
func newCacheFile() (string, error) {
cachedir, err := os.MkdirTemp("", "flyscrape-cache")
if err != nil {
return "", err
}
return filepath.Join(cachedir, "dev.cache"), nil
}
func trapsignal(f func()) {
sig := make(chan os.Signal, 2)
signal.Notify(sig, os.Interrupt, syscall.SIGTERM)
go func() {
<-sig
f()
os.Exit(0)
}()
}
func updateCfgMultiple(cfg Config, updates map[string]any) Config {
c := string(cfg)
for k, v := range updates {
nc, err := sjson.Set(c, k, v)
if err != nil {
continue
}
c = nc
}
return []byte(c)
}
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