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digest.go
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digest.go
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package main
import (
"bytes"
"fmt"
"github.com/sendgrid/sendgrid-go/helpers/mail"
"log"
"regexp"
"strings"
"time"
"crypto/tls"
"gopkg.in/gomail.v2"
)
import "github.com/slack-go/slack"
import "github.com/sendgrid/sendgrid-go"
var re = regexp.MustCompile(`(?m)<@(\w+)>`)
const initialNumBufSize = 24
func DigestTitle() string {
loc, _ := time.LoadLocation("America/Los_Angeles")
t := time.Now()
t = t.In(loc)
return fmt.Sprintf("Apache Pinot Daily Email Digest (%s)", t.Format("2006-01-02"))
}
func RunDailyDigest(c *Config) string {
if c.From == "" || c.To == "" || c.SendgridToken == "" {
fmt.Println("Some config is missing. Please double check `FROM/TO/SENDGRID_TOKEN`.")
return "Some config is missing. Please double check `FROM/TO/SENDGRID_TOKEN`."
}
// Initialize slack api
api := slack.New(c.SlackAppToken)
// Fetch user list
userList, err := Users(api)
if err != nil {
fmt.Println("Failed to fetch the user list: " + err.Error())
return "Failed to fetch the user list: " + err.Error()
}
// Fetch channels
pm := &slack.GetConversationsParameters{
ExcludeArchived: "true",
Limit: 1000,
}
channels, _, err := api.GetConversations(pm)
if err != nil {
fmt.Println("Failed to fetch the user list: " + err.Error())
return "Failed to fetch the user list: " + err.Error()
}
// Construct conversation history html content
buffer := bytes.NewBuffer(make([]byte, 0, initialNumBufSize))
for _, channel := range channels {
if channel.Name == "daily-digest" {
continue
}
ch := &slack.GetConversationHistoryParameters{
ChannelID: channel.ID,
Oldest: fmt.Sprintf("%f", float64(time.Now().Add(-24 * time.Hour).Unix())),
Latest: fmt.Sprintf("%f", float64(time.Now().Unix())),
Limit: 10000,
}
history, err := api.GetConversationHistory(ch)
if err != nil {
log.Println("Failed to get conversation history: ", channel.Name)
}
if len(history.Messages) > 0 {
buffer.WriteString(fmt.Sprintf("<h3><u>#%s</u></h3>", channel.Name))
buffer.WriteString("<br>")
for i := len(history.Messages) -1; i >=0; i-- {
m := history.Messages[i]
buffer.WriteString(fmt.Sprintf("<strong>%s: </strong>", userList[fmt.Sprintf("<@%s>", m.User)]))
buffer.WriteString(ReplaceMentionUser(userList, m.Text))
buffer.WriteString("<br>")
repliesParam := &slack.GetConversationRepliesParameters{
ChannelID: channel.ID,
Timestamp: m.Timestamp,
Limit: 1000,
}
replies, _, _, err := api.GetConversationReplies(repliesParam)
if err != nil {
log.Println("Failed to get conversation replies: ", channel.Name)
}
for j := 1; j < len(replies); j++ {
r := replies[j].Msg
buffer.WriteString(fmt.Sprintf("  <strong>%s: </strong>", userList[fmt.Sprintf("<@%s>", r.User)]))
buffer.WriteString(ReplaceMentionUser(userList, r.Text))
buffer.WriteString("<br>")
}
}
}
}
htmlContent := string(buffer.Bytes())
if len(htmlContent) <= 0 {
fmt.Println("Not sending a mail because the content size is zero")
return "Not sending a mail because the content size is zero"
}
if strings.ToUpper(c.MailClientType) == "GMAIL" {
return SendEmailViaGmail(c, DigestTitle(), htmlContent)
} else if strings.ToUpper(c.MailClientType) == "SENDGRID" {
// Send html content to mailing list
return SendEmailViaSendGrid(c, DigestTitle(), htmlContent)
} else {
log.Println("Invalid mail client type: ", c.MailClientType)
return "Invalid mail client type: " + c.MailClientType
}
}
func Users(api *slack.Client) (map[string]string, error) {
users, err := api.GetUsers()
if err != nil {
return nil, err
}
var userList = make(map[string]string)
for _, user := range users {
userList[fmt.Sprintf("<@%s>", user.ID)] = fmt.Sprintf("@%s", user.Name)
}
return userList, nil
}
func ReplaceMentionUser(userList map[string]string, text string) string {
var msg = text
for _, match := range re.FindAllString(msg, -1) {
msg = strings.ReplaceAll(msg, match, userList[match])
}
return msg
}
func SendEmailViaGmail(c *Config, subject string, htmlContent string) string {
d := gomail.NewDialer("smtp.gmail.com", 587, c.GmailAccount, c.GmailAppPassword)
d.TLSConfig = &tls.Config{InsecureSkipVerify: true}
// Send emails using d.
m := gomail.NewMessage()
m.SetAddressHeader("From", c.From, "Pinot Slack Email Digest")
m.SetHeader("To", c.To)
m.SetHeader("Subject", subject)
m.SetBody("text/html", htmlContent)
err := d.DialAndSend(m)
if err != nil {
fmt.Println("Failed to send the mail via Sendgrid: " + err.Error())
return "Failed to send mail via Sendgrid: " + err.Error()
} else {
msg := fmt.Sprintf("Daily digest successfully sent with the title: `%s`\n", DigestTitle())
fmt.Println(msg)
return msg
}
}
func SendEmailViaSendGrid(c *Config, subject string, htmlContent string) string {
from := mail.NewEmail("Pinot Slack Email Digest", c.From)
client := sendgrid.NewSendClient(c.SendgridToken)
to := mail.NewEmail("Apache Pinot Dev", c.To)
message := mail.NewSingleEmail(from, subject, to, htmlContent, htmlContent)
response, err := client.Send(message)
if err != nil {
fmt.Println("Failed to send the mail via Sendgrid: " + err.Error())
return "Failed to send mail via Sendgrid: " + err.Error()
}
if response.StatusCode >= 200 && response.StatusCode <= 204 {
msg := fmt.Sprintf("Daily digest sent with the title: `%s`\n", DigestTitle())
msg += fmt.Sprintf("StatusCode: `%d`\n", response.StatusCode)
fmt.Println(msg)
return msg
} else {
msg := fmt.Sprintf("Failed to send the mail via Sendgrid\n")
msg += fmt.Sprintf("StatusCode: `%d`\n", response.StatusCode)
msg += fmt.Sprintf("Body: ```%s```", response.Body)
fmt.Println(msg)
return msg
}
}