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data.go
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data.go
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package twitter
import (
"fmt"
"strings"
"golang.org/x/net/context"
"google.golang.org/appengine/datastore"
"google.golang.org/appengine/mail"
)
func getProfileByEmail(ctx context.Context, email string) (*profile, error) {
key := datastore.NewKey(ctx, "profile", email, 0, nil)
var p profile
err := datastore.Get(ctx, key, &p)
if err != nil {
return nil, err
}
return &p, nil
}
func getProfileByUsername(ctx context.Context, usr string) (*profile, error) {
query := datastore.NewQuery("profile")
p := []profile{}
_, err := query.Filter("Username =", usr).GetAll(ctx, &p)
if err != nil {
return nil, err
}
if len(p) == 0 {
return nil, datastore.ErrNoSuchEntity
} else if len(p) > 1 {
return nil, datastore.ErrInvalidKey
}
return &p[0], nil
}
func itemIn(item string, list []string) bool {
for _, v := range list {
if item == v {
return true
}
}
return false
}
func getMultiTweets(ctx context.Context, emails []string) ([]tweet, error) {
query := datastore.NewQuery("Tweets")
t := []tweet{}
query = query.Order("-SubmitTime")
it := query.Run(ctx)
for {
var i tweet
key, err := it.Next(&i)
if err == datastore.Done {
break
} else if err != nil {
return nil, err
}
p, err := getProfileByEmail(ctx, key.Parent().StringID())
if err != nil {
return nil, err
}
if !itemIn(p.Username, emails) {
continue
}
i.Username = p.Username
t = append(t, i)
}
return t, nil
}
func getTweets(ctx context.Context, email string) ([]tweet, error) {
query := datastore.NewQuery("Tweets")
t := []tweet{}
query = query.Order("-SubmitTime")
if email != "" {
key := datastore.NewKey(ctx, "profile", email, 0, nil)
query = query.Ancestor(key)
}
keys, err := query.GetAll(ctx, &t)
if err != nil {
return nil, err
}
for i := range t {
p, err := getProfileByEmail(ctx, keys[i].Parent().StringID())
if err != nil {
return nil, err
}
t[i].Username = p.Username
}
return t, nil
}
func createProfile(ctx context.Context, username, email string) error {
key := datastore.NewKey(ctx, "profile", email, 0, nil)
p := profile{
Username: username,
Email: email,
}
_, err := datastore.Put(ctx, key, &p)
return err
}
func emailUser(ctx context.Context, username string, t *tweet) error {
to, err := getProfileByUsername(ctx, username)
if err == datastore.ErrNoSuchEntity {
return nil
} else if err != nil {
return err
}
msg := &mail.Message{
Sender: "noreply@twitter-1012.appspotmail.com",
To: []string{fmt.Sprintf("%s <%s>", to.Username, to.Email)},
Subject: fmt.Sprintf("Mention from %s", t.Username),
Body: fmt.Sprintf("%s has mentioned you in a tweet: %s", t.Username, t.Message),
}
err = mail.Send(ctx, msg)
return err
}
func postTweet(ctx context.Context, t *tweet, email string) error {
words := strings.Fields(t.Message)
for _, w := range words {
if w[0] == '@' {
if err := emailUser(ctx, w[1:], t); err != nil {
return err
}
}
}
profileKey := datastore.NewKey(ctx, "profile", email, 0, nil)
key := datastore.NewIncompleteKey(ctx, "Tweets", profileKey)
_, err := datastore.Put(ctx, key, t)
return err
}
func addFollower(ctx context.Context, currentUser *profile, newFollowed string) error {
if itemIn(newFollowed, currentUser.Following) || newFollowed == currentUser.Username {
return nil
}
currentUser.Following = append(currentUser.Following, newFollowed)
key := datastore.NewKey(ctx, "profile", currentUser.Email, 0, nil)
_, err := datastore.Put(ctx, key, currentUser)
return err
}
func removeFollower(ctx context.Context, currentUser *profile, oldFollowed string) error {
needsStore := false
for i, f := range currentUser.Following {
if f == oldFollowed {
currentUser.Following = append(currentUser.Following[:i], currentUser.Following[i+1:]...)
needsStore = true
break
}
}
if !needsStore {
return nil
}
key := datastore.NewKey(ctx, "profile", currentUser.Email, 0, nil)
_, err := datastore.Put(ctx, key, currentUser)
return err
}