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|
package main
import (
"errors"
"flag"
"fmt"
"io"
"net/http"
"strings"
"time"
"golang.org/x/net/html"
)
const wosBaseURL = "https://wos-help.webofscience.com/WOKRS535R111/help/WOS"
var pageList = []string{
"0-9", "A", "B", "C", "D", "E", "F", "G", "H", "I",
"J", "K", "L", "M", "N", "O", "P", "Q", "R", "S",
"T", "U", "V", "W", "X", "Y", "Z",
}
type ScrapeCommand struct {
DBPath string
}
func (c *ScrapeCommand) Name() string { return "scrape" }
func (c *ScrapeCommand) Init(args []string) error {
fs := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
fs.StringVar(&c.DBPath, "db", "data/abvjt.db", "Path to SQLite database")
if err := fs.Parse(args); err != nil {
if errors.Is(err, flag.ErrHelp) {
fs.Usage()
return nil
}
return err
}
return nil
}
func (c *ScrapeCommand) Run(stdin io.Reader, stdout io.Writer) error {
db, err := OpenDB(c.DBPath)
if err != nil {
return err
}
defer db.Close()
client := &http.Client{
Timeout: 30 * time.Second,
}
var totalInserted int
for _, page := range pageList {
url := fmt.Sprintf("%s/%s_abrvjt.html", wosBaseURL, page)
fmt.Fprintf(stdout, "Fetching %s...\n", url)
journals, err := fetchPage(client, url)
if err != nil {
return fmt.Errorf("failed to fetch page %s: %w", page, err)
}
if len(journals) == 0 {
fmt.Fprintf(stdout, " Warning: no journals found on page %s\n", page)
continue
}
if err := db.InsertJournals(journals); err != nil {
return fmt.Errorf("failed to insert page %s: %w", page, err)
}
totalInserted += len(journals)
fmt.Fprintf(stdout, " Inserted %d journals\n", len(journals))
time.Sleep(200 * time.Millisecond)
}
count, err := db.Count()
if err != nil {
return fmt.Errorf("failed to get final count: %w", err)
}
fmt.Fprintf(stdout, "\nDone. Total journals inserted: %d (DB count: %d)\n", totalInserted, count)
return nil
}
func fetchPage(client *http.Client, url string) ([]Journal, error) {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", "abvjt/1.0")
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("HTTP %d", resp.StatusCode)
}
return parseWOSPage(resp.Body)
}
func parseWOSPage(r io.Reader) ([]Journal, error) {
tokenizer := html.NewTokenizer(r)
var journals []Journal
var nameBuf strings.Builder
var abbrevBuf strings.Builder
const (
stateDefault = iota
stateInName
stateExpectDD
stateInAbbrev
)
state := stateDefault
for {
tokenType := tokenizer.Next()
if tokenType == html.ErrorToken {
err := tokenizer.Err()
if err == io.EOF {
break
}
return nil, err
}
switch tokenType {
case html.StartTagToken:
token := tokenizer.Token()
switch token.Data {
case "dt":
state = stateInName
nameBuf.Reset()
case "b":
if state == stateInName {
state = stateExpectDD
}
case "dd":
if state == stateExpectDD {
state = stateInAbbrev
abbrevBuf.Reset()
}
}
case html.EndTagToken:
token := tokenizer.Token()
if token.Data == "b" && state == stateInAbbrev {
name := strings.TrimSpace(nameBuf.String())
abbrev := strings.TrimSpace(abbrevBuf.String())
if name != "" {
journals = append(journals, Journal{
FullName: name,
Abbreviation: abbrev,
})
}
state = stateDefault
}
case html.TextToken:
text := tokenizer.Token().Data
switch state {
case stateInName:
nameBuf.WriteString(text)
case stateInAbbrev:
abbrevBuf.WriteString(text)
}
}
}
return journals, nil
}
|
