/
gmail.go
255 lines (231 loc) · 7.15 KB
/
gmail.go
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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gmail
import (
"context"
"encoding/base64"
"log"
"net/http"
"github.com/matta/gotmuch/internal/message"
"github.com/pkg/errors"
"golang.org/x/time/rate"
"google.golang.org/api/gmail/v1"
gmail_api "google.golang.org/api/gmail/v1"
"google.golang.org/api/googleapi"
)
const (
ReadonlyScope = gmail_api.GmailReadonlyScope
// See https://developers.google.com/gmail/api/v1/reference/quota
quotaUnitsMessagesGet = 5
quotaUnitsPerGetProfile = 2
quotaUnitsPerHistoryList = 2
quotaUnitsPerMessagesList = 1
quotaUnitsPerSecond = 250
rateLimitPerSecond = quotaUnitsPerSecond * 0.8
rateLimitBurst = quotaUnitsPerSecond
)
var (
ErrMessageNotFound = errors.New("gmail message not found")
)
// GmailService provides access to messages stored in Google's GMail
// system.
type GmailService struct {
service *gmail.Service
limiter *rate.Limiter
}
func isChat(msg *gmail.Message) bool {
for _, label := range msg.LabelIds {
if label == "CHAT" {
return true
}
}
return false
}
func New(client *http.Client) (*GmailService, error) {
s, err := gmail.New(client)
if err != nil {
return nil, err
}
l := rate.NewLimiter(rateLimitPerSecond, rateLimitBurst)
return &GmailService{service: s, limiter: l}, nil
}
func (s *GmailService) ListAll(ctx context.Context, handler func(message.ID) error) error {
if err := s.limiter.WaitN(ctx, quotaUnitsPerMessagesList); err != nil {
return err
}
msgs := gmail.NewUsersMessagesService(s.service)
req := msgs.List("me").Q("-is:chat {in:inbox in:sent}") // XXX "in:all"
total := 0
err := req.Pages(ctx, func(page *gmail.ListMessagesResponse) (err error) {
total += len(page.Messages)
log.Printf("listed page of Gmail messages; count %d; total so far %d", len(page.Messages), total)
for _, msg := range page.Messages {
m := message.ID{PermID: msg.Id, ThreadID: msg.ThreadId}
if err := handler(m); err != nil {
return err
}
}
if page.NextPageToken != "" {
err = s.limiter.WaitN(ctx, quotaUnitsPerMessagesList)
}
return
})
log.Printf("done listing Gmail messages; total %d", total)
if err != nil {
err = errors.Wrap(err, "unable to retrieve all messages")
}
return err
}
func (s *GmailService) ListFrom(ctx context.Context, historyID uint64, handler func(message.ID) error) error {
wait := func() error {
return s.limiter.WaitN(ctx, quotaUnitsPerHistoryList)
}
if err := wait(); err != nil {
return err
}
// TODO: request labelAdded, labelRemoved, messageDeleted too.
req := gmail.NewUsersHistoryService(s.service).List("me").Context(ctx).HistoryTypes("messageAdded").StartHistoryId(historyID)
total := 0
err := req.Pages(ctx, func(page *gmail.ListHistoryResponse) (err error) {
total += len(page.History)
log.Printf("listed page of Gmail history; count %d; total so far %d", len(page.History), total)
for _, h := range page.History {
// TODO: handle labelAdded, labelRemoved, messageDeleted too.
for _, added := range h.MessagesAdded {
m := message.ID{
PermID: added.Message.Id,
ThreadID: added.Message.ThreadId,
}
if err := handler(m); err != nil {
return err
}
}
}
if page.NextPageToken != "" {
err = wait()
}
return
})
log.Printf("done listing Gmail messages; total %d", total)
if err != nil {
err = errors.Wrap(err, "unable to retrieve all messages")
}
return err
}
func (s *GmailService) getMessage(ctx context.Context, call *gmail.UsersMessagesGetCall) (*gmail.Message, error) {
for {
if err := s.limiter.WaitN(ctx, quotaUnitsMessagesGet); err != nil {
return nil, err
}
msg, err := call.Do()
if err == nil && isChat(msg) {
err = ErrMessageNotFound
}
if err == nil {
return msg, nil
}
switch cause := errors.Cause(err).(type) {
case *googleapi.Error:
if cause.Code == http.StatusTooManyRequests {
continue // retry
}
if cause.Code == http.StatusNotFound {
for _, item := range cause.Errors {
if item.Reason == "notFound" {
log.Printf("Warning: message not found...")
err = ErrMessageNotFound
}
}
}
}
return nil, err
}
}
func (s *GmailService) GetMessageHeader(ctx context.Context, id string) (*message.Header, error) {
for {
if err := s.limiter.WaitN(ctx, quotaUnitsMessagesGet); err != nil {
return nil, err
}
msg, err := s.getMessage(ctx, gmail.NewUsersMessagesService(s.service).Get("me", id).
Context(ctx).Format("minimal"))
if err != nil {
return nil, errors.Wrapf(err, "getting message %v from gmail", id)
}
m := &message.Header{ID: message.ID{PermID: msg.Id, ThreadID: msg.ThreadId},
LabelIDs: msg.LabelIds,
HistoryID: msg.HistoryId,
SizeEstimate: msg.SizeEstimate}
return m, nil
}
}
func (s *GmailService) GetMessageFull(ctx context.Context, id string) (*message.Body, error) {
if err := s.limiter.WaitN(ctx, quotaUnitsMessagesGet); err != nil {
return nil, err
}
msg, err := s.getMessage(ctx, gmail.NewUsersMessagesService(s.service).Get("me", id).
Context(ctx).Format("raw"))
if err != nil {
return nil, errors.Wrapf(err, "getting message %v from gmail", id)
}
raw, err := base64.URLEncoding.DecodeString(msg.Raw)
if err != nil {
return nil, errors.Wrapf(err, "decoding message %v from gmail", id)
}
m := &message.Body{
Header: message.Header{
ID: message.ID{PermID: msg.Id, ThreadID: msg.ThreadId},
LabelIDs: msg.LabelIds,
HistoryID: msg.HistoryId,
SizeEstimate: msg.SizeEstimate},
Raw: string(raw)}
return m, nil
}
func (s *GmailService) GetProfile(ctx context.Context) (*message.Profile, error) {
if err := s.limiter.WaitN(ctx, quotaUnitsPerGetProfile); err != nil {
return nil, err
}
u, err := gmail.NewUsersService(s.service).GetProfile("me").Context(ctx).Do()
if err != nil {
return nil, err
}
return &message.Profile{
EmailAddress: u.EmailAddress,
HistoryID: u.HistoryId,
}, nil
}
// func getFormat(minimal bool) string {
// if minimal {
// return "minimal"
// }
// return "raw"
// }
// func getMessage(ctx context.Context, limiter *rate.Limiter,
// messages *gmail.UsersMessagesService, id string, minimal bool) (msg *gmail.Message, err error) {
// msg, err = messages.Get("me", id).Context(ctx).Format(getFormat(minimal)).Do()
// if err != nil {
// err = errors.Wrapf(err, "getting message %v from gmail", id)
// }
// return
// // tx, err := db.BeginTx(ctx, nil)
// // if err != nil {
// // return errors.Wrap(err, "can't start transaction")
// // }
// // defer tx.Rollback()
// // for _, label := range m.LabelIds {
// // }
// //
// // err = req.Pages(ctx, func(page *gmail.ListMessagesResponse) error {
// // return handleListPage(ctx, db, messages, page)
// // })
// }