ripple-api/app/tokens.go

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package app
import (
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"crypto/md5"
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"database/sql"
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"fmt"
"time"
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"git.zxq.co/ripple/rippleapi/common"
"github.com/jmoiron/sqlx"
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)
// GetTokenFull retrieves an user ID and their token privileges knowing their API token.
func GetTokenFull(token string, db *sqlx.DB) (common.Token, bool) {
var (
t common.Token
tokenPrivsRaw uint64
userPrivsRaw uint64
priv8 bool
)
err := db.QueryRow(`SELECT
t.id, t.user, t.privileges, t.private, u.privileges
FROM tokens t
LEFT JOIN users u ON u.id = t.user
WHERE token = ? LIMIT 1`,
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fmt.Sprintf("%x", md5.Sum([]byte(token)))).
Scan(
&t.ID, &t.UserID, &tokenPrivsRaw, &priv8, &userPrivsRaw,
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)
updateTokens <- t.ID
if priv8 {
tokenPrivsRaw = common.PrivilegeReadConfidential | common.PrivilegeWrite
}
t.TokenPrivileges = common.Privileges(tokenPrivsRaw)
t.UserPrivileges = common.UserPrivileges(userPrivsRaw)
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switch {
case err == sql.ErrNoRows:
return common.Token{}, false
case err != nil:
panic(err)
default:
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t.Value = token
return t, true
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}
}
var updateTokens = make(chan int, 100)
func tokenUpdater(db *sqlx.DB) {
for {
// prepare a queue of tokens to update.
tokensToUpdate := make([]int, 0, 50)
AwaitLoop:
for {
// if we got ten, move on and update
if len(tokensToUpdate) >= 50 {
break
}
// if we ain't got any, add what we get straight from updateTokens
if len(tokensToUpdate) == 0 {
x := <-updateTokens
tokensToUpdate = append(tokensToUpdate, x)
continue
}
// otherwise, wait from updateTokens with a timeout of 10 seconds
select {
case x := <-updateTokens:
tokensToUpdate = append(tokensToUpdate, x)
case <-time.After(10 * time.Second):
// wondering what this means?
// https://golang.org/ref/spec#Break_statements
break AwaitLoop
}
}
q, a, _ := sqlx.In("UPDATE tokens SET last_updated = ? WHERE id IN (?)", time.Now().Unix(), tokensToUpdate)
q = db.Rebind(q)
_, err := db.Exec(q, a...)
if err != nil {
fmt.Println(err)
}
}
}