/
twitter-to-email.go
261 lines (221 loc) · 6.41 KB
/
twitter-to-email.go
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package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"strings"
"time"
"github.com/aws/aws-lambda-go/lambda"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
"github.com/aws/aws-sdk-go/service/ses"
"github.com/dghubble/go-twitter/twitter"
"github.com/dghubble/oauth1"
"github.com/peterbourgon/ff"
)
var (
// Configuration
bucket,
consumer_api_key,
consumer_api_secret_key,
access_token,
access_token_secret,
email *string
sess = session.Must(session.NewSession())
)
// formatDate formats dates into a valid S3 key
func formatDate(date time.Time) string {
return fmt.Sprintf("tweets/%d-%02d-%02d/tweets.json", date.Year(), date.Month(), date.Day())
}
// getTodaysKey returns a valid key name derived from the current date in UTC
func getTodaysKey() string {
return formatDate(time.Now().UTC())
}
// getYesterdaysKey returns a valid key name derived from the previous day in UTC
func getYesterdaysKey() string {
return formatDate(time.Now().UTC().AddDate(0, 0, -1))
}
// getStoredTweets retrieves stored tweets from a given key in the S3 bucket
func getStoredTweets(key string) ([]twitter.Tweet, error) {
svc := s3.New(sess)
fmt.Printf("Getting tweets from: s3://%s/%s\n", *bucket, key)
result, err := svc.GetObject(&s3.GetObjectInput{
Bucket: bucket,
Key: aws.String(key),
})
if err != nil {
return nil, err
}
var tweets []twitter.Tweet
err = json.NewDecoder(result.Body).Decode(&tweets)
return tweets, err
}
// uploadTweets uploads tweets into S3 bucket at given key
func uploadTweets(key string, tweets []twitter.Tweet) error {
uploader := s3manager.NewUploader(sess)
buf := bytes.NewBuffer([]byte{})
err := json.NewEncoder(buf).Encode(tweets)
if err != nil {
return err
}
fmt.Printf("Uploading %d tweets to s3://%s/%s\n", len(tweets), *bucket, key)
_, err = uploader.Upload(&s3manager.UploadInput{
Bucket: bucket,
Key: aws.String(key),
Body: buf,
})
if err != nil {
return err
}
return nil
}
// getNewTweets retrieves tweets newer than sinceID using the Twitter API
func getNewTweets(sinceID int64) ([]twitter.Tweet, error) {
config := oauth1.NewConfig(*consumer_api_key, *consumer_api_secret_key)
token := oauth1.NewToken(*access_token, *access_token_secret)
// OAuth1 http.Client will automatically authorize Requests
httpClient := config.Client(oauth1.NoContext, token)
// Twitter client
client := twitter.NewClient(httpClient)
// Home Timeline
homeTimelineParams := &twitter.HomeTimelineParams{
SinceID: sinceID,
TweetMode: "extended",
Count: 200,
}
tweets, _, err := client.Timelines.HomeTimeline(homeTimelineParams)
if err != nil {
return nil, err
}
fmt.Printf("%d New Tweets Found\n", len(tweets))
return tweets, nil
}
// TODO document this
func fetchTweets() error {
today := getTodaysKey()
storedTweets, err := getStoredTweets(today)
var sinceID int64
if err != nil {
if aerr, ok := err.(awserr.Error); ok {
switch aerr.Code() {
case s3.ErrCodeNoSuchKey:
fmt.Printf("%s not found. Trying to retrieve yesterday’s tweets\n", today)
yesterday := getYesterdaysKey()
storedTweets, err := getStoredTweets(yesterday)
if err != nil {
if aerr, ok := err.(awserr.Error); ok {
switch aerr.Code() {
case s3.ErrCodeNoSuchKey:
fmt.Printf("%s not found.\n", yesterday)
default:
return aerr
}
} else {
return err
}
}
if len(storedTweets) > 0 {
fmt.Println("Emailing yesterday’s tweets")
err = emailTweets(storedTweets)
if err != nil {
return err
}
// Find last tweet from yesterday
lastTweet := storedTweets[0]
for _, tweet := range storedTweets {
if tweet.ID > lastTweet.ID {
lastTweet = tweet
}
}
sinceID = lastTweet.ID
storedTweets = []twitter.Tweet{lastTweet}
fmt.Println("Uploading last tweet from yesterday for tracking")
} else {
fmt.Printf("Uploading an empty array to %s\n", today)
}
err = uploadTweets(today, storedTweets)
if err != nil {
return err
}
default:
return aerr
}
} else {
return aerr
}
} else {
fmt.Printf("%d Older Tweets Found\n", len(storedTweets))
for _, tweet := range storedTweets {
if tweet.ID > sinceID {
sinceID = tweet.ID
}
}
}
newTweets, err := getNewTweets(sinceID)
if err != nil {
return err
}
if len(newTweets) == 0 {
// Nothing more to do
return nil
}
tweets := append(newTweets, storedTweets...)
return uploadTweets(today, tweets)
}
// emailTweets formats and emails tweets
func emailTweets(tweets []twitter.Tweet) error {
builder := strings.Builder{}
for i := len(tweets) - 1; i > -1; i-- {
tweet := tweets[i]
builder.WriteString(fmt.Sprintf("@%s: %s\nhttps://twitter.com/%s/status/%d\n\n--\n", tweet.User.ScreenName, tweet.FullText, tweet.User.ScreenName, tweet.ID))
}
svc := ses.New(session.Must(session.NewSession(&aws.Config{
Region: aws.String("us-east-1")}, // SES is only available in limited AWS regions, so we hardcode the region here.
)))
// Assemble the email.
input := &ses.SendEmailInput{
Destination: &ses.Destination{
CcAddresses: []*string{},
ToAddresses: []*string{
email,
},
},
Message: &ses.Message{
Body: &ses.Body{
Text: &ses.Content{
Charset: aws.String("UTF-8"),
Data: aws.String(builder.String()),
},
},
Subject: &ses.Content{
Charset: aws.String("UTF-8"),
Data: aws.String(fmt.Sprintf("Tweets from the past 24h (%d)", len(tweets))),
},
},
Source: email,
}
// Attempt to send the email.
_, err := svc.SendEmail(input)
return err
}
// getConfig populates the config variables from a JSON file
func getConfig() {
fs := flag.NewFlagSet("twitter-to-email", flag.ExitOnError)
bucket = fs.String("bucket", "", "S3 Bucket")
consumer_api_key = fs.String("consumer-api-key", "", "Twitter Consumer API Key")
consumer_api_secret_key = fs.String("consumer-api-secret-key", "", "Twitter Consumer API Secret Key")
access_token = fs.String("access-token", "", "Twitter Access token")
access_token_secret = fs.String("access-token-secret", "", "Twitter Access token secret")
email = fs.String("email", "", "Email")
ff.Parse(fs, []string{},
ff.WithConfigFile("config.json"),
ff.WithConfigFileParser(ff.JSONParser))
}
func main() {
getConfig()
lambda.Start(fetchTweets)
}