go/twitterchiver: init

This commit is contained in:
Luke Granger-Brown 2020-10-04 00:17:35 +01:00
parent 2c613bf2f1
commit 00c94273fd
5 changed files with 450 additions and 0 deletions

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FROM golang:1.13-buster as build
RUN mkdir /go/src/app
WORKDIR /go/src/app
ADD go.mod go.sum /go/src/app
RUN go get -d -v ./...
ADD archiver /go/src/app/archiver
RUN go build -o /go/bin/app ./archiver
# Now copy it into our base image.
FROM gcr.io/distroless/base-debian10
COPY --from=build /go/bin/app /
CMD ["/app"]

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package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"log"
"net/http"
"os"
"os/signal"
"sync"
"time"
"github.com/dghubble/oauth1"
"github.com/jackc/pgx/v4"
)
var (
databaseURL = flag.String("database_url", "", "Database URL")
tickInterval = flag.Duration("tick_interval", 1*time.Minute, "Tick interval")
workers = flag.Int("twitter_workers", 5, "Workers to spawn for fetching info from Twitter API")
)
type user struct {
UserID int64
Username string
AccessToken, AccessSecret string
LatestTweet int64
}
func userAccounts(ctx context.Context, conn *pgx.Conn) ([]user, error) {
rows, err := conn.Query(ctx, "SELECT userid, username, access_token, access_secret, latest_tweet FROM user_accounts")
if err != nil {
return nil, fmt.Errorf("retrieving user accounts: %w", err)
}
defer rows.Close()
var users []user
for rows.Next() {
var u user
err = rows.Scan(&u.UserID, &u.Username, &u.AccessToken, &u.AccessSecret, &u.LatestTweet)
if err != nil {
return nil, fmt.Errorf("scanning user account: %w", err)
}
users = append(users, u)
}
if rows.Err() != nil {
return nil, fmt.Errorf("fetching user accounts: %w", rows.Err())
}
return users, nil
}
type tweet struct {
ID int64 `json:"id"`
Text string `json:"full_text"`
Data json.RawMessage `json:"-"`
}
func insertTweet(ctx context.Context, conn *pgx.Conn, tw tweet) error {
_, err := conn.Exec(ctx, "INSERT INTO tweets (id, text, object) VALUES ($1, $2, $3) ON CONFLICT DO NOTHING", tw.ID, tw.Text, tw.Data)
return err
}
func fetchTweets(ctx context.Context, twitterOAuthConfig *oauth1.Config, user user) ([]tweet, error) {
log.Printf("Fetching tweets for %s (%d)", user.Username, user.UserID)
httpClient := twitterOAuthConfig.Client(ctx, oauth1.NewToken(user.AccessToken, user.AccessSecret))
req, err := http.NewRequest("GET", "https://api.twitter.com/1.1/statuses/home_timeline.json?count=200&include_entities=true&exclude_replies=false&tweet_mode=extended", nil)
if err != nil {
return nil, fmt.Errorf("constructing request to Twitter API: %w", err)
}
req = req.WithContext(ctx)
q := req.URL.Query()
if user.LatestTweet != 0 {
q.Set("since_id", fmt.Sprintf("%d", user.LatestTweet))
}
req.URL.RawQuery = q.Encode()
resp, err := httpClient.Do(req)
if err != nil {
return nil, fmt.Errorf("querying Twitter API: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("Twitter API returned status %s", resp.Status)
}
var tweetsRaw []json.RawMessage
if err := json.NewDecoder(resp.Body).Decode(&tweetsRaw); err != nil {
return nil, fmt.Errorf("decoding JSON from Twitter API: %w", err)
}
tweets := make([]tweet, 0, len(tweetsRaw))
for _, tweetRaw := range tweetsRaw {
var tw tweet
if err := json.Unmarshal([]byte(tweetRaw), &tw); err != nil {
return nil, fmt.Errorf("decoding tweet: %w\n%v", err, string(tweetRaw))
}
tw.Data = tweetRaw
tweets = append(tweets, tw)
}
return tweets, nil
}
type userResult struct {
UserID int64
TweetID int64
}
func updateUser(ctx context.Context, conn *pgx.Conn, ur userResult) error {
_, err := conn.Exec(ctx, "UPDATE user_accounts SET latest_tweet=$1 WHERE userid=$2", ur.TweetID, ur.UserID)
return err
}
func tick(ctx context.Context, conn *pgx.Conn, twitterOAuthConfig *oauth1.Config) error {
users, err := userAccounts(ctx, conn)
if err != nil {
return err
}
userCh := make(chan user)
resultCh := make(chan tweet)
userResultCh := make(chan userResult)
wCnt := *workers
if wCnt > len(users) {
wCnt = len(users)
}
var wg sync.WaitGroup
wg.Add(wCnt)
go func() {
wg.Wait()
close(resultCh)
close(userResultCh)
}()
for n := 0; n < wCnt; n++ {
go func() {
defer wg.Done()
var largestTweetID int64
var tweetCount int
for user := range userCh {
tweets, err := fetchTweets(ctx, twitterOAuthConfig, user)
if err != nil {
log.Printf("failed to fetch tweets for %v: %v", user.Username, err)
continue
}
for _, tw := range tweets {
tweetCount++
resultCh <- tw
if tw.ID > largestTweetID {
largestTweetID = tw.ID
}
}
log.Printf("ingested tweets for %v (%d tweets, largest ID %d)", user.Username, tweetCount, largestTweetID)
if largestTweetID != 0 {
userResultCh <- userResult{
UserID: user.UserID,
TweetID: largestTweetID,
}
}
}
}()
}
go func() {
defer close(userCh)
for _, user := range users {
userCh <- user
}
}()
func() {
resultCh, userResultCh := resultCh, userResultCh
for {
if resultCh == nil && userResultCh == nil {
return
}
select {
case tw, ok := <-resultCh:
if !ok {
resultCh = nil
continue
}
if err := insertTweet(ctx, conn, tw); err != nil {
log.Printf("Failed to insert tweet %d: %v\n%v", tw.ID, err, tw.Data)
}
case userResult, ok := <-userResultCh:
if !ok {
userResultCh = nil
continue
}
if err := updateUser(ctx, conn, userResult); err != nil {
log.Printf("Failed to update user %d: %v", userResult.UserID, err)
}
}
}
}()
return nil
}
func main() {
flag.Parse()
ctx := context.Background()
conn, err := pgx.Connect(ctx, *databaseURL)
if err != nil {
fmt.Fprintf(os.Stderr, "Unable to connect to database: %v\n", err)
os.Exit(1)
}
defer conn.Close(ctx)
ckey, csecret := os.Getenv("TWITTER_OAUTH_CONSUMER_KEY"), os.Getenv("TWITTER_OAUTH_CONSUMER_SECRET")
if ckey == "" || csecret == "" {
fmt.Fprintf(os.Stderr, "No TWITTER_OAUTH_CONSUMER_KEY or TWITTER_OAUTH_CONSUMER_SECRET\n")
os.Exit(1)
}
twitterOAuthConfig := oauth1.NewConfig(ckey, csecret)
stop := func() <-chan struct{} {
st := make(chan os.Signal)
signal.Notify(st, os.Interrupt)
stopCh := make(chan struct{})
go func() {
<-st
log.Printf("Shutting down")
close(stopCh)
signal.Reset(os.Interrupt)
}()
return stopCh
}()
log.Printf("Started up.")
log.Printf("Doing initial fetch.")
if err := tick(ctx, conn, twitterOAuthConfig); err != nil {
log.Printf("tick failed: %v", err)
}
t := time.NewTicker(*tickInterval)
loop:
for {
select {
case <-t.C:
log.Printf("Tick...")
if err := tick(ctx, conn, twitterOAuthConfig); err != nil {
log.Printf("tick failed: %v", err)
}
case <-stop:
break loop
}
}
}

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CREATE TABLE tweets (
id BIGINT NOT NULL,
text TEXT NOT NULL,
object JSONB NOT NULL
);
CREATE TABLE user_accounts (
username TEXT NOT NULL PRIMARY KEY,
userid BIGINT NOT NULL,
access_token TEXT NOT NULL,
access_secret TEXT NOT NULL,
latest_tweet BIGINT NOT NULL
);

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go/twitterchiver/go.mod Normal file
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module github.com/lukegb/twitterchiver
go 1.14
require (
github.com/dghubble/oauth1 v0.6.0
github.com/jackc/pgx/v4 v4.8.1
)

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go/twitterchiver/go.sum Normal file
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