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acx-scraper.go
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acx-scraper.go
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package main
import (
"context"
"database/sql"
"encoding/json"
"flag"
"fmt"
"io"
"log"
"net/http"
"os"
"runtime/pprof"
"time"
"github.com/google/subcommands"
_ "github.com/mattn/go-sqlite3"
)
type commentsJSON struct {
Comments []comment
}
type comment struct {
ID int64
PostID int64 `json:"post_id"`
UserID int64 `json:"user_id"`
Date string
Body *string
Name string
Deleted bool
AncestorPath string `json:"ancestor_path"`
ChildrenCount int64 `json:"children_count"`
Children []comment
}
type article struct {
ID int64
PublicationID int64 `json:"publication_id"`
Title string
SocialTitle string `json:"social_title"`
Slug string
PostDate string `json:"post_date"`
Audience string
WriteCommentPermissions string `json:"write_comment_permissions"`
CanonicalURL string `json:"canonical_url"`
CoverImage string `json:"cover_image"`
Description string
WordCount int64
CommentCount int64 `json:"comment_count"`
ChildCommentCount int64 `json:"child_comment_count"`
}
type articlesCmd struct {
database string
cpuProfile bool
}
func (*articlesCmd) Name() string {
return "articles"
}
func (*articlesCmd) Synopsis() string {
return "Get all the articles from ACX."
}
func (*articlesCmd) Usage() string {
return `articles [-d/-database <database_name>] -c/-cpuProfile
Get all the articles from ACX, write it in the database.
`
}
func (a *articlesCmd) SetFlags(f *flag.FlagSet) {
date := time.Now().Format("2006-01-02")
dbName := "acx-comments_" + date + ".db"
usage := "sqlite database name. The default name is acx-comments_YYYY-MM-DD.db"
f.StringVar(&a.database, "database", dbName, usage)
f.StringVar(&a.database, "d", dbName, usage)
f.BoolVar(&a.cpuProfile, "c", false, "write cpu profile")
f.BoolVar(&a.cpuProfile, "cpuProfile", false, "write cpu profile")
}
func (a *articlesCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
if a.cpuProfile {
a, err := os.Create("cpu.prof")
if err != nil {
panic(err)
}
if err := pprof.StartCPUProfile(a); err != nil {
panic(err)
}
defer pprof.StopCPUProfile()
}
getArticles(a.database)
return subcommands.ExitSuccess
}
type commentsCmd struct {
database string
cpuProfile bool
}
func (*commentsCmd) Name() string {
return "comments"
}
func (*commentsCmd) Synopsis() string {
return "Get all the comments of the ACX articles in the database."
}
func (*commentsCmd) Usage() string {
return `comments [-d/-database <database_name>] -c/-cpuProfile
Read the database to get all the articles, get the comments for each articles,
insert them in the database.
`
}
func (c *commentsCmd) SetFlags(f *flag.FlagSet) {
date := time.Now().Format("2006-01-02")
dbName := "acx-comments_" + date + ".db"
usage := "sqlite database name. The default name is acx-comments_YYYY-MM-DD.db"
f.StringVar(&c.database, "database", dbName, usage)
f.StringVar(&c.database, "d", dbName, usage)
f.BoolVar(&c.cpuProfile, "c", false, "write cpu profile")
f.BoolVar(&c.cpuProfile, "cpuProfile", false, "write cpu profile")
}
func (c *commentsCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
if c.cpuProfile {
a, err := os.Create("cpu.prof")
if err != nil {
panic(err)
}
if err := pprof.StartCPUProfile(a); err != nil {
panic(err)
}
defer pprof.StopCPUProfile()
}
getComments(c.database)
return subcommands.ExitSuccess
}
func main() {
subcommands.Register(subcommands.HelpCommand(), "")
subcommands.Register(subcommands.FlagsCommand(), "")
subcommands.Register(subcommands.CommandsCommand(), "")
subcommands.Register(&articlesCmd{}, "")
subcommands.Register(&commentsCmd{}, "")
flag.Parse()
ctx := context.Background()
os.Exit(int(subcommands.Execute(ctx)))
}
func flattenComments(comments []comment) []comment {
// fmt.Printf("Comments: %+v\n", comments)
if len(comments) == 0 {
return []comment{}
}
var output []comment
for _, c := range comments {
output = append(output, c)
output = append(output, flattenComments(c.Children)...)
}
return output
}
func insertComments(db *sql.DB, comments []comment) error {
stmt, err := db.Prepare("INSERT INTO comments (ID, PostID, UserID, Date, Body, Name, AncestorPath, ChildrenCount, OriginalJSON) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)")
if err != nil {
return err
}
defer stmt.Close()
tx, err := db.Begin()
if err != nil {
return fmt.Errorf("failed to begin transaction: %w", err)
}
txStmt := tx.Stmt(stmt)
for _, c := range comments {
originalJSON, err := json.Marshal(c)
if err != nil {
fmt.Fprintln(os.Stderr, err)
continue
}
_, err = txStmt.Exec(c.ID, c.PostID, c.UserID, c.Date, c.Body, c.Name, c.AncestorPath, c.ChildrenCount, originalJSON)
if err != nil {
fmt.Fprintln(os.Stderr, err)
continue
}
}
err = tx.Commit()
if err != nil {
return err
}
return nil
}
func getComments(databaseName string) {
db, err := sql.Open("sqlite3", databaseName)
if err != nil {
log.Fatalf("Failed to open database %s: %v", databaseName, err)
}
defer db.Close()
commentsSchema := `
CREATE TABLE IF NOT EXISTS comments (
ID INTEGER PRIMARY KEY,
PostID INTEGER,
UserID INTEGER,
Date TEXT,
Body TEXT,
Name TEXT,
AncestorPath TEXT,
ChildrenCount INTEGER,
OriginalJSON TEXT NOT NULL
);`
_, err = db.Exec(commentsSchema)
if err != nil {
log.Fatalf("Failed to create 'comments' table: %v", err)
}
rows, err := db.Query(`SELECT ID FROM articles;`)
if err != nil {
log.Fatalf("Failed to get the articles IDs: %v", err)
}
defer rows.Close()
var articlesIDs []int64
for rows.Next() {
var articleID int64
if err := rows.Scan(&articleID); err != nil {
log.Fatal(err)
}
articlesIDs = append(articlesIDs, articleID)
}
for _, articleID := range articlesIDs {
url := fmt.Sprintf("https://www.astralcodexten.com/api/v1/post/%d/comments?token=&all_comments=true&sort=oldest_first", articleID)
fmt.Println(url)
res, err := http.Get(url)
if err != nil {
fmt.Fprintln(os.Stderr, err)
continue
}
defer res.Body.Close()
body, err := io.ReadAll(res.Body)
if err != nil {
fmt.Fprintln(os.Stderr, err)
continue
}
var commentFile commentsJSON
err = json.Unmarshal(body, &commentFile)
if err != nil {
fmt.Fprintln(os.Stderr, err)
continue
}
flatComments := flattenComments(commentFile.Comments)
err = insertComments(db, flatComments)
if err != nil {
fmt.Fprintln(os.Stderr, err)
continue
}
time.Sleep(1 * time.Second)
}
}
// noArticles is the JSON returned by the Substack API when there are no articles at that offset.
const noArticles = "[]"
// getArticles downloads all the article metadata from ACX, 12 by 12, and store it in JSON files in an "articles" folder.
// The JSON files are named "article_offset_N", with N being the offset used in the query.
func getArticles(databaseName string) {
// First open/create the database and the 'articles' table.
db, err := sql.Open("sqlite3", databaseName)
if err != nil {
log.Fatalf("Failed to open the database %s: %v", databaseName, err)
}
defer db.Close()
articlesSchema := `
CREATE TABLE IF NOT EXISTS articles (
ID INTEGER PRIMARY KEY,
PublicationID INTEGER NOT NULL,
Title TEXT NOT NULL,
SocialTitle TEXT NOT NULL,
Slug TEXT UNIQUE NOT NULL,
PostDate TEXT NOT NULL,
Audience TEXT NOT NULL,
WriteCommentPermissions TEXT NOT NULL,
CanonicalURL TEXT NOT NULL,
CoverImage TEXT NOT NULL,
Description TEXT NOT NULL,
WordCount INTEGER NOT NULL,
CommentCount INTEGER NOT NULL,
ChildCommentCount INTEGER NOT NULL,
OriginalJSON TEXT NOT NULL
);`
_, err = db.Exec(articlesSchema)
if err != nil {
log.Fatalf("Failed to create 'articles' table: %v", err)
}
// Loop on the articles until there are no left, and store them in the database.
offset := 0
baseURL := `https://www.astralcodexten.com/api/v1/archive?sort=new&search=&offset=%d&limit=12`
for {
// Query the API, get the articles, read the body.
url := fmt.Sprintf(baseURL, offset)
fmt.Println(url)
res, err := http.Get(url)
if err != nil {
log.Fatalf("Failed to get '%s': %v", baseURL, err)
}
defer res.Body.Close()
body, err := io.ReadAll(res.Body)
if err != nil {
log.Fatalf("Failed to read the body of '%s': %v", baseURL, err)
}
if string(body) == noArticles {
break
}
// Read the body as JSON, store it in the database.
var articles []article
var articlesJSON []interface{}
err = json.Unmarshal(body, &articles)
if err != nil {
log.Fatalf("Failed to unmarshal body into struct of '%s': %v", baseURL, err)
}
err = json.Unmarshal(body, &articlesJSON)
if err != nil {
log.Fatalf("Failed to unmarshal body of '%s': %v", baseURL, err)
}
stmt, err := db.Prepare("INSERT INTO articles (ID, PublicationID, Title, SocialTitle, Slug, PostDate, Audience, WriteCommentPermissions, CanonicalURL, CoverImage, Description, WordCount, CommentCount, ChildCommentCount, OriginalJSON) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)")
if err != nil {
log.Fatalf("Failed to prepare statement: %v", err)
}
tx, err := db.Begin()
if err != nil {
log.Fatalf("Failed to begin transaction: %v", err)
}
txStmt := tx.Stmt(stmt)
for i, article := range articles {
firstArticleAsByte, err := json.Marshal(articlesJSON[i])
if err != nil {
log.Fatalf("Failed to marshal article %d: %v", i, err)
}
firstArticleAsString := string(firstArticleAsByte)
txStmt.Exec(article.ID, article.PublicationID, article.Title, article.SocialTitle, article.Slug, article.PostDate, article.Audience, article.WriteCommentPermissions, article.CanonicalURL, article.CoverImage, article.Description, article.WordCount, article.CommentCount, article.ChildCommentCount, firstArticleAsString)
}
err = tx.Commit()
if err != nil {
log.Fatalf("Failed to commit statement: %v", err)
}
offset += 12
time.Sleep(1 * time.Second)
}
res, err := db.Query("SELECT COUNT(ID) FROM articles;")
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
defer res.Close()
res.Next()
var articlesNumber int
err = res.Scan(&articlesNumber)
if err != nil {
fmt.Fprintln(os.Stderr, err)
} else {
fmt.Printf("%d articles found\n", articlesNumber)
}
}