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package main
import (
"flag"
"fmt"
"log"
"os"
"time"
"flyscrape"
)
type RunCommand struct{}
func (c *RunCommand) Run(args []string) error {
fs := flag.NewFlagSet("flyscrape-run", flag.ContinueOnError)
concurrent := fs.Int("concurrent", 0, "concurrency")
fs.Usage = c.Usage
if err := fs.Parse(args); err != nil {
return err
} else if fs.NArg() == 0 || fs.Arg(0) == "" {
return fmt.Errorf("script path required")
} else if fs.NArg() > 1 {
return fmt.Errorf("too many arguments")
}
script := fs.Arg(0)
src, err := os.ReadFile(script)
if err != nil {
return fmt.Errorf("failed to read script %q: %w", script, err)
}
opts, scrape, err := flyscrape.Compile(string(src))
if err != nil {
return fmt.Errorf("failed to compile script: %w", err)
}
svc := flyscrape.Scraper{
ScrapeOptions: opts,
ScrapeFunc: scrape,
Concurrency: *concurrent,
}
count := 0
start := time.Now()
for result := range svc.Scrape() {
flyscrape.PrettyPrint(result)
count++
}
log.Printf("Scraped %d websites in %v\n", count, time.Since(start))
return nil
}
func (c *RunCommand) Usage() {
fmt.Println(`
The run command runs the scraping script.
Usage:
flyscrape run SCRIPT
Arguments:
-concurrent NUM
Determines the number of concurrent requests.
Examples:
# Run the script.
$ flyscrape run example.js
# Run the script with 10 concurrent requests.
$ flyscrape run -concurrent 10 example.js
`[1:])
}
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