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Locking updates in database backend #3774

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merged 3 commits into from
Jan 18, 2018
Merged

Locking updates in database backend #3774

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7b655b3
updating locking
Jan 11, 2018
092bdcb
ensure closeIfShutdown has the write lock
Jan 11, 2018
1f51628
removing object check since this is happening in create
Jan 11, 2018
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7 changes: 4 additions & 3 deletions builtin/logical/database/path_creds_create.go
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Original file line number Diff line number Diff line change
Expand Up @@ -56,7 +56,7 @@ func (b *databaseBackend) pathCredsCreateRead() framework.OperationFunc {

// Grab the read lock
b.RLock()
var unlockFunc func() = b.RUnlock
unlockFunc := b.RUnlock

// Get the Database object
db, ok := b.getDBObj(role.DBName)
Expand All @@ -83,9 +83,8 @@ func (b *databaseBackend) pathCredsCreateRead() framework.OperationFunc {

// Create the user
username, password, err := db.CreateUser(ctx, role.Statements, usernameConfig, expiration)
// Unlock
unlockFunc()
if err != nil {
unlockFunc()
b.closeIfShutdown(role.DBName, err)
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rather than giving up the lock and requiring it in the closeIfShutdown function what if we unlocked after the closeIfShutdown call. That'll protect against another thread getting the lock before we reset the plugin.

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I originally went down that route but we don't always have the write lock when this method gets called.

return nil, err
}
Expand All @@ -98,6 +97,8 @@ func (b *databaseBackend) pathCredsCreateRead() framework.OperationFunc {
"role": name,
})
resp.Secret.TTL = role.DefaultTTL

unlockFunc()
return resp, nil
}
}
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15 changes: 7 additions & 8 deletions builtin/logical/database/secret_creds.go
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,7 @@ func (b *databaseBackend) secretCredsRenew() framework.OperationFunc {

// Grab the read lock
b.RLock()
var unlockFunc func() = b.RUnlock
unlockFunc := b.RUnlock

// Get the Database object
db, ok := b.getDBObj(role.DBName)
Expand All @@ -71,14 +71,14 @@ func (b *databaseBackend) secretCredsRenew() framework.OperationFunc {
// Make sure we increase the VALID UNTIL endpoint for this user.
if expireTime := resp.Secret.ExpirationTime(); !expireTime.IsZero() {
err := db.RenewUser(ctx, role.Statements, username, expireTime)
// Unlock
unlockFunc()
if err != nil {
unlockFunc()
b.closeIfShutdown(role.DBName, err)
return nil, err
}
}

unlockFunc()
return resp, nil
}
}
Expand Down Expand Up @@ -109,7 +109,7 @@ func (b *databaseBackend) secretCredsRevoke() framework.OperationFunc {

// Grab the read lock
b.RLock()
var unlockFunc func() = b.RUnlock
unlockFunc := b.RUnlock

// Get our connection
db, ok := b.getDBObj(role.DBName)
Expand All @@ -127,14 +127,13 @@ func (b *databaseBackend) secretCredsRevoke() framework.OperationFunc {
}
}

err = db.RevokeUser(ctx, role.Statements, username)
// Unlock
unlockFunc()
if err != nil {
if err := db.RevokeUser(ctx, role.Statements, username); err != nil {
unlockFunc()
b.closeIfShutdown(role.DBName, err)
return nil, err
}

unlockFunc()
return resp, nil
}
}