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database.go
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database.go
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package database
import (
"database/sql"
"encoding/json"
"fmt"
"os"
"time"
"github.com/cihub/seelog"
_ "github.com/mattn/go-sqlite3"
"github.com/pkg/errors"
"github.com/schollz/kiki/src/keypair"
"github.com/schollz/kiki/src/letter"
"github.com/schollz/kiki/src/logging"
"github.com/schollz/kiki/src/purpose"
flock "github.com/theckman/go-flock"
)
var (
logger logging.SeelogWrapper
log seelog.LoggerInterface
)
type database struct {
name string
db *sql.DB
fileLock *flock.Flock
}
func init() {
logger = logging.New()
log = logger.Log
}
func Debug(verbose bool) {
if verbose {
logger.SetLevel("debug")
} else {
logger.SetLevel("warn")
}
log = logger.Log
}
// open will open the database for transactions by first aquiring a filelock.
func open(fileName string, readOnly ...bool) (d *database, err error) {
d = new(database)
// convert the name to base64 for file writing
d.name = fileName
// if read-only, make sure the database exists
if _, err = os.Stat(d.name); err != nil && len(readOnly) > 0 && readOnly[0] {
err = errors.New(fmt.Sprintf("database '%s' does not exist", d.name))
return
}
// obtain a lock on the database
d.fileLock = flock.NewFlock(d.name + ".lock")
for {
locked, err := d.fileLock.TryLock()
if err == nil && locked {
break
}
time.Sleep(10 * time.Millisecond)
}
// check if it is a new database
newDatabase := false
if _, err := os.Stat(d.name); os.IsNotExist(err) {
newDatabase = true
}
// open sqlite3 database
d.db, err = sql.Open("sqlite3", d.name)
if err != nil {
return
}
// create new database tables if needed
if newDatabase {
err = d.MakeTables()
if err != nil {
return
}
}
return
}
// Close will close the database connection and remove the filelock.
func (d *database) Close() (err error) {
// close filelock
err = d.fileLock.Unlock()
if err != nil {
log.Error(err)
} else {
os.Remove(d.name + ".lock")
}
// close database
err2 := d.db.Close()
if err2 != nil {
err = err2
log.Error(err)
}
return
}
// MakeTables creates two tables, a `keystore` table:
//
// BUCKET_KEY (TEXT) VALUE (TEXT)
//
// and also a `letters`:
func (d *database) MakeTables() (err error) {
sqlStmt := `CREATE TABLE tags (tag TEXT, e_id TEXT);`
_, err = d.db.Exec(sqlStmt)
if err != nil {
err = errors.Wrap(err, "MakeTables")
return
}
sqlStmt = `CREATE index tags_idx on tags(tag,e_id);`
_, err = d.db.Exec(sqlStmt)
if err != nil {
err = errors.Wrap(err, "MakeTables")
return
}
sqlStmt = `create table keystore (bucket_key text not null primary key, value text);`
_, err = d.db.Exec(sqlStmt)
if err != nil {
err = errors.Wrap(err, "MakeTables")
return
}
sqlStmt = `create index keystore_idx on keystore(bucket_key);`
_, err = d.db.Exec(sqlStmt)
if err != nil {
err = errors.Wrap(err, "MakeTables")
return
}
// The "letters" table contains all the envelopes (opened and unopened) and their respective inforamtion in the letters.
sqlStmt = `create table letters (id text not null primary key, time TIMESTAMP, sender text, signature text, sealed_recipients text, sealed_letter text, opened integer, letter_purpose text, letter_to text, letter_content text, letter_firstid text, letter_replyto text, unique(id), UNIQUE(signature));`
_, err = d.db.Exec(sqlStmt)
if err != nil {
err = errors.Wrap(err, "MakeTables, letters")
return
}
// indices
sqlStmt = `CREATE INDEX idx_sender ON letters(opened,letter_purpose,sender,letter_content);`
_, err = d.db.Exec(sqlStmt)
if err != nil {
err = errors.Wrap(err, "MakeTables, letters")
return
}
// indices
sqlStmt = `CREATE INDEX idx_content ON letters(opened,letter_purpose,letter_content,id,letter_replyto);`
_, err = d.db.Exec(sqlStmt)
if err != nil {
err = errors.Wrap(err, "MakeTables, letters")
return
}
// indices
sqlStmt = `CREATE INDEX idx_replyto ON letters(opened,letter_purpose,letter_replyto);`
_, err = d.db.Exec(sqlStmt)
if err != nil {
err = errors.Wrap(err, "MakeTables, letters")
return
}
// indices
sqlStmt = `CREATE INDEX idx_replaces ON letters(opened,letter_firstid);`
_, err = d.db.Exec(sqlStmt)
if err != nil {
err = errors.Wrap(err, "MakeTables, letters")
return
}
// indices
sqlStmt = `CREATE INDEX idx_purpose ON letters(sender,letter_purpose);`
_, err = d.db.Exec(sqlStmt)
if err != nil {
err = errors.Wrap(err, "MakeTables, letters")
return
}
return
}
// AddTag will add a tag into the database if it hasn't already been inserted.
func (d *database) AddTag(tag, id string) (err error) {
if exists := d.TagExists(tag, id); exists {
return
}
tx, err := d.db.Begin()
if err != nil {
return errors.Wrap(err, "AddTag")
}
stmt, err := tx.Prepare("INSERT INTO tags(tag,e_id) values (?, ?)")
if err != nil {
return errors.Wrap(err, "AddTag")
}
defer stmt.Close()
_, err = stmt.Exec(tag, id)
if err != nil {
return errors.Wrap(err, "AddTag")
}
err = tx.Commit()
if err != nil {
return errors.Wrap(err, "AddTag")
}
return
}
// TagExists will return an error if the tag and ID does not exist
func (d *database) TagExists(tag, id string) (yes bool) {
stmt, err := d.db.Prepare("SELECT e_id FROM tags WHERE tag = ? AND e_id = ?")
if err != nil {
panic(err)
}
defer stmt.Close()
var result string
err = stmt.QueryRow(tag, id).Scan(&result)
if err != nil {
return
}
if result == "" {
return
}
return true
}
// GetIDsFromTag get all the ides for a tag
func (d *database) GetIDsFromTag(tag string) (ids []string, err error) {
stmt, err := d.db.Prepare("SELECT e_id FROM tags WHERE tag = ?")
if err != nil {
return nil, errors.Wrap(err, "problem preparing SQL")
}
defer stmt.Close()
rows, err := stmt.Query(tag)
if err != nil {
return nil, errors.Wrap(err, "problem getting key")
}
ids = []string{}
for rows.Next() {
var id string
err = rows.Scan(&id)
if err != nil {
err = errors.Wrap(err, "GetIDsFromTag")
return
}
ids = append(ids, id)
}
return
}
// Get will retrieve the value associated with a key.
func (d *database) Get(bucket, key string, v interface{}) (err error) {
stmt, err := d.db.Prepare("select value from keystore where bucket_key = ?")
if err != nil {
return errors.Wrap(err, "problem preparing SQL")
}
defer stmt.Close()
var result string
err = stmt.QueryRow(bucket + "/" + key).Scan(&result)
if err != nil {
return errors.Wrap(err, "problem getting key")
}
err = json.Unmarshal([]byte(result), &v)
if err != nil {
return
}
return
}
// Set will set a value in the database, when using it like a keystore.
func (d *database) Set(bucket, key string, value interface{}) (err error) {
var b []byte
b, err = json.Marshal(value)
if err != nil {
return err
}
tx, err := d.db.Begin()
if err != nil {
return errors.Wrap(err, "Set")
}
stmt, err := tx.Prepare("insert or replace into keystore(bucket_key,value) values (?, ?)")
if err != nil {
return errors.Wrap(err, "Set")
}
defer stmt.Close()
_, err = stmt.Exec(bucket+"/"+key, string(b))
if err != nil {
return errors.Wrap(err, "Set")
}
err = tx.Commit()
if err != nil {
return errors.Wrap(err, "Set")
}
return
}
// addEnvelope will add or replace an envelope
func (d *database) addEnvelope(e letter.Envelope) (err error) {
tx, err := d.db.Begin()
if err != nil {
return
}
var opened int
// marshaled things
var mSealedRecipients, mTo string
if e.Opened {
opened = 1
} else {
opened = 0
}
var b []byte
b, err = json.Marshal(e.SealedRecipients)
if err != nil {
return errors.Wrap(err, "problem marshaling SealedRecipients")
}
mSealedRecipients = string(b)
b, err = json.Marshal(e.Letter.To)
if err != nil {
return errors.Wrap(err, "problem marshaling To")
}
mTo = string(b)
stmt, err := tx.Prepare("insert or replace into letters(id,time,sender,signature,sealed_recipients,sealed_letter,opened,letter_purpose,letter_to,letter_content,letter_firstid,letter_replyto) values(?,?,?,?,?,?,?,?,?,?,?,?)")
if err != nil {
return
}
defer stmt.Close()
_, err = stmt.Exec(e.ID, e.Timestamp, e.Sender.Public, e.Signature, mSealedRecipients, e.SealedLetter, opened, e.Letter.Purpose, mTo, e.Letter.Content, e.Letter.FirstID, e.Letter.ReplyTo)
if err != nil {
return
}
tx.Commit()
return
}
func (d *database) getAllFromQuery(query string) (s []letter.Envelope, err error) {
rows, err := d.db.Query(query)
if err != nil {
err = errors.Wrap(err, "getAllFromQuery")
return
}
defer rows.Close()
// parse rows
s, err = d.getRows(rows)
if err != nil {
err = errors.Wrap(err, query)
}
return
}
// getAllFromPreparedQuery
func (d *database) getAllFromPreparedQuery(query string, args ...interface{}) (s []letter.Envelope, err error) {
// prepare statement
logger.Log.Debug(query)
stmt, err := d.db.Prepare(query)
if err != nil {
err = errors.Wrap(err, query)
return
}
defer stmt.Close()
rows, err := stmt.Query(args...)
if err != nil {
err = errors.Wrap(err, query)
return
}
defer rows.Close()
s, err = d.getRows(rows)
if err != nil {
err = errors.Wrap(err, query)
}
return
}
func (d *database) getRows(rows *sql.Rows) (s []letter.Envelope, err error) {
// loop through rows
s = []letter.Envelope{}
for rows.Next() {
var e letter.Envelope
e.Letter = letter.Letter{}
var opened int
// marshaled things
var mSender, mSealedRecipients, mTo string
err = rows.Scan(&e.ID, &e.Timestamp, &mSender, &e.Signature, &mSealedRecipients, &e.SealedLetter, &opened, &e.Letter.Purpose, &mTo, &e.Letter.Content, &e.Letter.FirstID, &e.Letter.ReplyTo)
e.Sender, err = keypair.FromPublic(mSender)
json.Unmarshal([]byte(mSealedRecipients), &e.SealedRecipients)
json.Unmarshal([]byte(mTo), &e.Letter.To)
e.Opened = opened == 1
if err != nil {
err = errors.Wrap(err, "getRows")
return
}
s = append(s, e)
}
err = rows.Err()
if err != nil {
err = errors.Wrap(err, "getRows")
}
return
}
// getKeys returns all the keys shared with you in the database, which can be queried by the sender
func (d *database) getKeys(sender ...string) (s []keypair.KeyPair, err error) {
s = []keypair.KeyPair{}
var query string
if len(sender) > 0 {
query = fmt.Sprintf("SELECT letter_content FROM letters WHERE opened == 1 AND letter_purpose == '%s' AND sender == '%s' ORDER BY time DESC;", purpose.ShareKey, sender[0])
} else {
query = fmt.Sprintf("SELECT letter_content FROM letters WHERE opened == 1 AND letter_purpose == '%s' ORDER BY time DESC;", purpose.ShareKey)
}
logger.Log.Debug(query)
rows, err := d.db.Query(query)
if err != nil {
err = errors.Wrap(err, "getKeys")
return
}
defer rows.Close()
// loop through rows
for rows.Next() {
var mKeyPair string
err = rows.Scan(&mKeyPair)
if err != nil {
err = errors.Wrap(err, "getKeys")
return
}
var kp keypair.KeyPair
err = json.Unmarshal([]byte(mKeyPair), &kp)
if err != nil {
return
}
s = append(s, kp)
}
err = rows.Err()
if err != nil {
err = errors.Wrap(err, "getKeys")
}
return
}
// getIDs returns all the envelope IDs
func (d *database) getIDs(sender ...string) (s []string, err error) {
s = []string{}
query := fmt.Sprintf("SELECT id FROM letters ORDER BY time DESC;")
if len(sender) > 0 {
query = fmt.Sprintf("SELECT id FROM letters WHERE sender == '%s' ORDER BY time DESC;", sender[0])
}
rows, err := d.db.Query(query)
if err != nil {
err = errors.Wrap(err, "getIDs")
return
}
defer rows.Close()
// loop through rows
for rows.Next() {
var mID string
err = rows.Scan(&mID)
if err != nil {
err = errors.Wrap(err, "getIDs")
return
}
s = append(s, mID)
}
err = rows.Err()
if err != nil {
err = errors.Wrap(err, "getIDs")
}
return
}
// getName returns the name of a person
func (d *database) getName(person string) (name string, err error) {
query := fmt.Sprintf("SELECT letter_content FROM letters WHERE opened == 1 AND letter_purpose == '%s' AND sender == '%s' ORDER BY time DESC;", purpose.ActionName, person)
logger.Log.Debug(query)
rows, err := d.db.Query(query)
if err != nil {
err = errors.Wrap(err, "getName")
return
}
defer rows.Close()
// loop through rows
for rows.Next() {
err = rows.Scan(&name)
if err != nil {
err = errors.Wrap(err, "getName")
return
}
break
}
err = rows.Err()
if err != nil {
err = errors.Wrap(err, "getName")
}
return
}
// getProfile returns the profile of a person
func (d *database) getProfile(person string) (profile string, err error) {
query := fmt.Sprintf("SELECT letter_content FROM letters WHERE opened == 1 AND letter_purpose == '%s' AND sender == '%s' ORDER BY time DESC;", purpose.ActionProfile, person)
logger.Log.Debug(query)
rows, err := d.db.Query(query)
if err != nil {
err = errors.Wrap(err, "getProfile")
return
}
defer rows.Close()
// loop through rows
for rows.Next() {
err = rows.Scan(&profile)
if err != nil {
err = errors.Wrap(err, "getProfile")
return
}
break
}
err = rows.Err()
if err != nil {
err = errors.Wrap(err, "getProfile")
}
return
}
// getProfileImage returns the ID of the profile image of a person
func (d *database) getProfileImage(person string) (imageID string, err error) {
query := fmt.Sprintf("SELECT letter_content FROM letters WHERE opened == 1 AND letter_purpose == '%s' AND sender == '%s' ORDER BY time DESC;", purpose.ActionImage, person)
logger.Log.Debug(query)
rows, err := d.db.Query(query)
if err != nil {
err = errors.Wrap(err, "getProfileImage")
return
}
defer rows.Close()
// loop through rows
for rows.Next() {
err = rows.Scan(&imageID)
if err != nil {
err = errors.Wrap(err, "getProfileImage")
return
}
break
}
err = rows.Err()
if err != nil {
err = errors.Wrap(err, "getProfileImage")
}
return
}
func (d *database) getFriendsName(publicKey string) (name string) {
query := "SELECT sender FROM letters WHERE opened == 1 AND letter_purpose == '" + purpose.ShareKey + "' AND letter_content LIKE '%" + publicKey + "%' LIMIT 1;"
logger.Log.Debug(query)
rows, err := d.db.Query(query)
if err != nil {
return
}
defer rows.Close()
var sender string
for rows.Next() {
rows.Scan(&sender)
}
if sender == "" {
return
}
senderName, _ := d.getName(sender)
if senderName != "" {
sender = senderName
}
return "Friends of " + sender
}
// deleteLetterFromID will delete a letter with the pertaining ID.
func (d *database) deleteLetterFromID(id string) (err error) {
tx, err := d.db.Begin()
if err != nil {
return errors.Wrap(err, "deleteLetterFromID")
}
query := "DELETE FROM letters WHERE id == ?"
logger.Log.Debug(query)
stmt, err := tx.Prepare(query)
if err != nil {
return errors.Wrap(err, "deleteLetterFromID")
}
defer stmt.Close()
_, err = stmt.Exec(id)
if err != nil {
return errors.Wrap(err, "deleteLetterFromID")
}
err = tx.Commit()
if err != nil {
return errors.Wrap(err, "deleteLetterFromID")
}
return
}
// deleteLettersFromSender will delete a letter with the pertaining ID.
func (d *database) deleteLettersFromSender(sender string) (err error) {
tx, err := d.db.Begin()
if err != nil {
return errors.Wrap(err, "deleteLettersFromSender")
}
query := "DELETE FROM letters WHERE sender == ?"
logger.Log.Debug(query, sender)
stmt, err := tx.Prepare(query)
if err != nil {
return errors.Wrap(err, "deleteLettersFromSender")
}
defer stmt.Close()
_, err = stmt.Exec(sender)
if err != nil {
return errors.Wrap(err, "deleteLettersFromSender")
}
err = tx.Commit()
if err != nil {
return errors.Wrap(err, "deleteLettersFromSender")
}
return
}
// deleteUsersOldestPost will delete a letter with the pertaining ID.
func (d *database) deleteUsersOldestPost(publicKey string) (err error) {
tx, err := d.db.Begin()
if err != nil {
return errors.Wrap(err, "deleteUsersOldestPost")
}
logger.Log.Debug(publicKey)
query := "DELETE from letters WHERE id in (SELECT id FROM letters WHERE letter_purpose IN ('share-text','share-image/png','share-image/jpg','') AND sender == ? ORDER BY time LIMIT 1);"
logger.Log.Debug(query)
stmt, err := tx.Prepare(query)
if err != nil {
return errors.Wrap(err, "deleteUsersOldestPost")
}
defer stmt.Close()
_, err = stmt.Exec(publicKey)
if err != nil {
return errors.Wrap(err, "deleteUsersOldestPost")
}
err = tx.Commit()
if err != nil {
return errors.Wrap(err, "deleteUsersOldestPost")
}
return
}
// deleteUsersOldestPost will delete a letter with the pertaining ID.
func (d *database) deleteUsersOldestLargestPost(publicKey string) (err error) {
tx, err := d.db.Begin()
if err != nil {
return errors.Wrap(err, "deleteUsersOldestLargestPost")
}
logger.Log.Debug(publicKey)
query := "DELETE from letters WHERE id in (SELECT id FROM letters WHERE LENGTH(sealed_letter) > 5000 AND sender == ? ORDER BY time LIMIT 1);"
logger.Log.Debug(query)
stmt, err := tx.Prepare(query)
if err != nil {
return errors.Wrap(err, "deleteUsersOldestLargestPost")
}
defer stmt.Close()
_, err = stmt.Exec(publicKey)
if err != nil {
return errors.Wrap(err, "deleteUsersOldestLargestPost")
}
err = tx.Commit()
if err != nil {
return errors.Wrap(err, "deleteUsersOldestLargestPost")
}
return
}
// deleteUser will delete everything except the ActionErases
func (d *database) deleteUsers() (err error) {
tx, err := d.db.Begin()
if err != nil {
return errors.Wrap(err, "deleteUser")
}
query := "DELETE FROM letters WHERE sender IN (SELECT sender FROM letters WHERE letter_purpose == '" + purpose.ActionErase + "');"
logger.Log.Debug(query)
stmt, err := tx.Prepare(query)
if err != nil {
return errors.Wrap(err, "deleteUser")
}
defer stmt.Close()
_, err = stmt.Exec()
if err != nil {
return errors.Wrap(err, "deleteUser")
}
err = tx.Commit()
if err != nil {
return errors.Wrap(err, "deleteUser")
}
return
}
// deleteUser will delete everything except the ActionErases
func (d *database) deleteUser(publicKey string) (err error) {
tx, err := d.db.Begin()
if err != nil {
return errors.Wrap(err, "deleteUser")
}
query := "DELETE FROM letters WHERE sender == ?;"
logger.Log.Debug(query)
stmt, err := tx.Prepare(query)
if err != nil {
return errors.Wrap(err, "deleteUser")
}
defer stmt.Close()
_, err = stmt.Exec(publicKey)
if err != nil {
return errors.Wrap(err, "deleteUser")
}
err = tx.Commit()
if err != nil {
return errors.Wrap(err, "deleteUser")
}
return
}
// deleteUsersOldActions will delete old actions and leave only the most recent action undeleted
func (d *database) deleteUsersOldActions(publicKey string, purpose string) (err error) {
tx, err := d.db.Begin()
if err != nil {
return errors.Wrap(err, "deleteUsersOldActions")
}
logger.Log.Debug(publicKey, purpose)
query := "DELETE FROM letters WHERE id in (SELECT id FROM letters WHERE opened == 1 AND letter_purpose == ? AND sender == ? ORDER BY time DESC LIMIT 1000000000 OFFSET 1);"
logger.Log.Debug(query)
stmt, err := tx.Prepare(query)
if err != nil {
return errors.Wrap(err, "deleteUsersOldActions")
}
defer stmt.Close()
_, err = stmt.Exec(purpose, publicKey)
if err != nil {
return errors.Wrap(err, "deleteUsersOldActions")
}
err = tx.Commit()
if err != nil {
return errors.Wrap(err, "deleteUsersOldActions")
}
return
}
// deleteUsersEdits will delete a letter with the pertaining ID.
func (d *database) deleteUsersEdits(publicKey string) (err error) {
ids, err := d.getIDs(publicKey)
if err != nil {
return
}
for _, id := range ids {
idVersions, err := d.getAllVersions(id)
if err != nil {
continue
}
for i, idVersion := range idVersions {
if i == 0 {
continue
}
d.deleteLetterFromID(idVersion)
}
}
return
}
// isReplaced will see if there is more than one of a first_id, which only happens if something has been replaced.
func (d *database) isReplaced(id string) (yes bool, err error) {
stmt, err := d.db.Prepare("SELECT COUNT(id) WHERE opened == 1 AND letter_firstid == ?")
if err != nil {
err = errors.Wrap(err, "problem preparing SQL")
return
}
defer stmt.Close()
var num int
err = stmt.QueryRow(id).Scan(&num)
if err != nil {
return false, errors.Wrap(err, "problem getting")
}
yes = num > 1
return
}
func (d *database) diskSpaceForUser(user string) (diskSpace int64, err error) {
diskSpace = 0
stmt, err := d.db.Prepare("SELECT SUM(LENGTH(sealed_letter))+SUM(LENGTH(sealed_recipients)) FROM letters WHERE sender==?")
if err != nil {
err = errors.Wrap(err, "problem preparing SQL")
return
}
defer stmt.Close()
stmt.QueryRow(user).Scan(&diskSpace)
return
}
func (d *database) numLikesPerPost(idPost string) (likes int64, err error) {
stmt, err := d.db.Prepare("SELECT COUNT(id) FROM letters WHERE opened == 1 AND letter_purpose == '" + purpose.ActionLike + "' AND letter_content=?")
if err != nil {
err = errors.Wrap(err, "problem preparing SQL")
return
}
defer stmt.Close()
err = stmt.QueryRow(idPost).Scan(&likes)
if err != nil {
err = errors.Wrap(err, "problem getting")
}
return
}
func (d *database) listUsers() (s []string, err error) {
query := fmt.Sprintf("SELECT DISTINCT(sender) FROM letters;")
logger.Log.Debug(query)
rows, err := d.db.Query(query)
if err != nil {
err = errors.Wrap(err, "listUsers")
return
}
defer rows.Close()
s = []string{}
for rows.Next() {
var mID string
err = rows.Scan(&mID)
if err != nil {
err = errors.Wrap(err, "listUsers")
return
}
s = append(s, mID)
}
err = rows.Err()
if err != nil {
err = errors.Wrap(err, "listUsers")
}
return
}
func (d *database) listBlockedUsers(publicKey string) (s []string, err error) {
query := fmt.Sprintf("SELECT letter_content FROM letters WHERE opened == 1 AND letter_purpose == '%s' AND sender == '%s' AND letter_content != '';", purpose.ActionBlock, publicKey)
logger.Log.Debug(query)
rows, err := d.db.Query(query)
if err != nil {
err = errors.Wrap(err, "listBlockedUsers")
return
}
defer rows.Close()
s = []string{}
for rows.Next() {
var mID string
err = rows.Scan(&mID)
if err != nil {
err = errors.Wrap(err, "listBlockedUsers")
return
}
s = append(s, mID)
}
err = rows.Err()
if err != nil {
err = errors.Wrap(err, "listBlockedUsers")
}
return
}
func (d *database) getFollowing(publicKey string) (s []string, err error) {
query := fmt.Sprintf("SELECT DISTINCT(letter_content) FROM letters WHERE opened == 1 AND letter_purpose == '%s' AND sender == '%s' ;", purpose.ActionFollow, publicKey)
logger.Log.Debug(query)
rows, err := d.db.Query(query)
if err != nil {
err = errors.Wrap(err, "getFollowing")
return
}
defer rows.Close()
// parse rows
s = []string{}
for rows.Next() {
var mID string
err = rows.Scan(&mID)
if err != nil {
err = errors.Wrap(err, "getFollowing")
return
}
if mID == "" {
continue
}
s = append(s, mID)
}
err = rows.Err()
if err != nil {
err = errors.Wrap(err, "getFollowing")
}
return
}
func (d *database) getFollowers(publicKey string) (s []string, err error) {
query := fmt.Sprintf("SELECT DISTINCT(sender) FROM letters WHERE opened==1 AND letter_purpose == '%s' AND letter_content == '%s';", purpose.ActionFollow, publicKey)
logger.Log.Debug(query)
rows, err := d.db.Query(query)
if err != nil {
err = errors.Wrap(err, "getFollowers")
return
}
defer rows.Close()
s = []string{}
for rows.Next() {
var mID string
err = rows.Scan(&mID)
if err != nil {
err = errors.Wrap(err, "getFollowers")
return
}
if mID == "" {
continue
}
s = append(s, mID)
}
err = rows.Err()
if err != nil {
err = errors.Wrap(err, "getFollowers")
}
return
}
func (d *database) getAllVersions(id string) (s []string, err error) {
es, err := d.getAllFromPreparedQuery("SELECT * FROM letters WHERE opened == 1 AND letter_firstid == (SELECT letter_firstid FROM letters WHERE opened ==1 AND id == ?) ORDER BY time DESC", id)
if err != nil {
return
}
if len(es) == 0 {
err = errors.New("no letters")
return
}
s = make([]string, len(es))
for i, e := range es {
s[i] = e.ID
}
return
}
func (d *database) getKeyForFriends(user string) (key keypair.KeyPair, err error) {
stmt, err := d.db.Prepare("SELECT letter_content FROM letters WHERE opened ==1 AND letter_purpose==? AND sender==? ORDER BY time DESC")
if err != nil {
err = errors.Wrap(err, "getKeyForFriends, bad statement")
return
}
defer stmt.Close()
var keystring string
err = stmt.QueryRow(purpose.ShareKey, user).Scan(&keystring)
if err != nil {
err = errors.Wrap(err, "getKeyForFriends, bad scan")
return
}
logger.Log.Infof(`query: "SELECT letter_content FROM letters WHERE opened ==1 AND letter_purpose=='%s' AND sender=='%s' ORDER BY time DESC": [%v]`, purpose.ShareKey, user, keystring)