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backend.go
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/
backend.go
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package mongodb
import (
"fmt"
"strings"
"sync"
"time"
"github.com/hashicorp/vault/logical"
"github.com/hashicorp/vault/logical/framework"
"gopkg.in/mgo.v2"
)
func Factory(conf *logical.BackendConfig) (logical.Backend, error) {
b := Backend()
if err := b.Setup(conf); err != nil {
return nil, err
}
return b, nil
}
func Backend() *framework.Backend {
var b backend
b.Backend = &framework.Backend{
Help: strings.TrimSpace(backendHelp),
Paths: []*framework.Path{
pathConfigConnection(&b),
pathConfigLease(&b),
pathListRoles(&b),
pathRoles(&b),
pathCredsCreate(&b),
},
Secrets: []*framework.Secret{
secretCreds(&b),
},
Clean: b.ResetSession,
Invalidate: b.invalidate,
}
return b.Backend
}
type backend struct {
*framework.Backend
session *mgo.Session
lock sync.Mutex
}
// Session returns the database connection.
func (b *backend) Session(s logical.Storage) (*mgo.Session, error) {
b.lock.Lock()
defer b.lock.Unlock()
if b.session != nil {
if err := b.session.Ping(); err == nil {
return b.session, nil
}
b.session.Close()
}
connConfigJSON, err := s.Get("config/connection")
if err != nil {
return nil, err
}
if connConfigJSON == nil {
return nil, fmt.Errorf("configure the MongoDB connection with config/connection first")
}
var connConfig connectionConfig
if err := connConfigJSON.DecodeJSON(&connConfig); err != nil {
return nil, err
}
dialInfo, err := parseMongoURI(connConfig.URI)
if err != nil {
return nil, err
}
b.session, err = mgo.DialWithInfo(dialInfo)
if err != nil {
return nil, err
}
b.session.SetSyncTimeout(1 * time.Minute)
b.session.SetSocketTimeout(1 * time.Minute)
return b.session, nil
}
// ResetSession forces creation of a new connection next time Session() is called.
func (b *backend) ResetSession() {
b.lock.Lock()
defer b.lock.Unlock()
if b.session != nil {
b.session.Close()
}
b.session = nil
}
func (b *backend) invalidate(key string) {
switch key {
case "config/connection":
b.ResetSession()
}
}
// LeaseConfig returns the lease configuration
func (b *backend) LeaseConfig(s logical.Storage) (*configLease, error) {
entry, err := s.Get("config/lease")
if err != nil {
return nil, err
}
if entry == nil {
return nil, nil
}
var result configLease
if err := entry.DecodeJSON(&result); err != nil {
return nil, err
}
return &result, nil
}
const backendHelp = `
The mongodb backend dynamically generates MongoDB credentials.
After mounting this backend, configure it using the endpoints within
the "config/" path.
`