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statement_executor.go
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statement_executor.go
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package meta
import (
"fmt"
"github.com/influxdb/influxdb/influxql"
)
// StatementExecutor translates InfluxQL queries to meta store methods.
type StatementExecutor struct {
Store interface {
Nodes() ([]NodeInfo, error)
Database(name string) (*DatabaseInfo, error)
Databases() ([]DatabaseInfo, error)
CreateDatabase(name string) (*DatabaseInfo, error)
DropDatabase(name string) error
DefaultRetentionPolicy(database string) (*RetentionPolicyInfo, error)
CreateRetentionPolicy(database string, rpi *RetentionPolicyInfo) (*RetentionPolicyInfo, error)
UpdateRetentionPolicy(database, name string, rpu *RetentionPolicyUpdate) error
SetDefaultRetentionPolicy(database, name string) error
DropRetentionPolicy(database, name string) error
Users() ([]UserInfo, error)
CreateUser(name, password string, admin bool) (*UserInfo, error)
UpdateUser(name, password string) error
DropUser(name string) error
SetPrivilege(username, database string, p influxql.Privilege) error
SetAdminPrivilege(username string, admin bool) error
UserPrivileges(username string) (map[string]influxql.Privilege, error)
UserPrivilege(username, database string) (*influxql.Privilege, error)
CreateContinuousQuery(database, name, query string) error
DropContinuousQuery(database, name string) error
}
}
// ExecuteStatement executes stmt against the meta store as user.
func (e *StatementExecutor) ExecuteStatement(stmt influxql.Statement) *influxql.Result {
switch stmt := stmt.(type) {
case *influxql.CreateDatabaseStatement:
return e.executeCreateDatabaseStatement(stmt)
case *influxql.DropDatabaseStatement:
return e.executeDropDatabaseStatement(stmt)
case *influxql.ShowDatabasesStatement:
return e.executeShowDatabasesStatement(stmt)
case *influxql.ShowGrantsForUserStatement:
return e.executeShowGrantsForUserStatement(stmt)
case *influxql.ShowServersStatement:
return e.executeShowServersStatement(stmt)
case *influxql.CreateUserStatement:
return e.executeCreateUserStatement(stmt)
case *influxql.SetPasswordUserStatement:
return e.executeSetPasswordUserStatement(stmt)
case *influxql.DropUserStatement:
return e.executeDropUserStatement(stmt)
case *influxql.ShowUsersStatement:
return e.executeShowUsersStatement(stmt)
case *influxql.GrantStatement:
return e.executeGrantStatement(stmt)
case *influxql.GrantAdminStatement:
return e.executeGrantAdminStatement(stmt)
case *influxql.RevokeStatement:
return e.executeRevokeStatement(stmt)
case *influxql.RevokeAdminStatement:
return e.executeRevokeAdminStatement(stmt)
case *influxql.CreateRetentionPolicyStatement:
return e.executeCreateRetentionPolicyStatement(stmt)
case *influxql.AlterRetentionPolicyStatement:
return e.executeAlterRetentionPolicyStatement(stmt)
case *influxql.DropRetentionPolicyStatement:
return e.executeDropRetentionPolicyStatement(stmt)
case *influxql.ShowRetentionPoliciesStatement:
return e.executeShowRetentionPoliciesStatement(stmt)
case *influxql.CreateContinuousQueryStatement:
return e.executeCreateContinuousQueryStatement(stmt)
case *influxql.DropContinuousQueryStatement:
return e.executeDropContinuousQueryStatement(stmt)
case *influxql.ShowContinuousQueriesStatement:
return e.executeShowContinuousQueriesStatement(stmt)
case *influxql.ShowStatsStatement:
return e.executeShowStatsStatement(stmt)
default:
panic(fmt.Sprintf("unsupported statement type: %T", stmt))
}
}
func (e *StatementExecutor) executeCreateDatabaseStatement(q *influxql.CreateDatabaseStatement) *influxql.Result {
_, err := e.Store.CreateDatabase(q.Name)
return &influxql.Result{Err: err}
}
func (e *StatementExecutor) executeDropDatabaseStatement(q *influxql.DropDatabaseStatement) *influxql.Result {
return &influxql.Result{Err: e.Store.DropDatabase(q.Name)}
}
func (e *StatementExecutor) executeShowDatabasesStatement(q *influxql.ShowDatabasesStatement) *influxql.Result {
dis, err := e.Store.Databases()
if err != nil {
return &influxql.Result{Err: err}
}
row := &influxql.Row{Name: "databases", Columns: []string{"name"}}
for _, di := range dis {
row.Values = append(row.Values, []interface{}{di.Name})
}
return &influxql.Result{Series: []*influxql.Row{row}}
}
func (e *StatementExecutor) executeShowGrantsForUserStatement(q *influxql.ShowGrantsForUserStatement) *influxql.Result {
priv, err := e.Store.UserPrivileges(q.Name)
if err != nil {
return &influxql.Result{Err: err}
}
row := &influxql.Row{Columns: []string{"database", "privilege"}}
for d, p := range priv {
row.Values = append(row.Values, []interface{}{d, p.String()})
}
return &influxql.Result{Series: []*influxql.Row{row}}
}
func (e *StatementExecutor) executeShowServersStatement(q *influxql.ShowServersStatement) *influxql.Result {
nis, err := e.Store.Nodes()
if err != nil {
return &influxql.Result{Err: err}
}
row := &influxql.Row{Columns: []string{"id", "url"}}
for _, ni := range nis {
row.Values = append(row.Values, []interface{}{ni.ID, "http://" + ni.Host})
}
return &influxql.Result{Series: []*influxql.Row{row}}
}
func (e *StatementExecutor) executeCreateUserStatement(q *influxql.CreateUserStatement) *influxql.Result {
_, err := e.Store.CreateUser(q.Name, q.Password, q.Admin)
return &influxql.Result{Err: err}
}
func (e *StatementExecutor) executeSetPasswordUserStatement(q *influxql.SetPasswordUserStatement) *influxql.Result {
return &influxql.Result{Err: e.Store.UpdateUser(q.Name, q.Password)}
}
func (e *StatementExecutor) executeDropUserStatement(q *influxql.DropUserStatement) *influxql.Result {
return &influxql.Result{Err: e.Store.DropUser(q.Name)}
}
func (e *StatementExecutor) executeShowUsersStatement(q *influxql.ShowUsersStatement) *influxql.Result {
uis, err := e.Store.Users()
if err != nil {
return &influxql.Result{Err: err}
}
row := &influxql.Row{Columns: []string{"user", "admin"}}
for _, ui := range uis {
row.Values = append(row.Values, []interface{}{ui.Name, ui.Admin})
}
return &influxql.Result{Series: []*influxql.Row{row}}
}
func (e *StatementExecutor) executeGrantStatement(stmt *influxql.GrantStatement) *influxql.Result {
return &influxql.Result{Err: e.Store.SetPrivilege(stmt.User, stmt.On, stmt.Privilege)}
}
func (e *StatementExecutor) executeGrantAdminStatement(stmt *influxql.GrantAdminStatement) *influxql.Result {
return &influxql.Result{Err: e.Store.SetAdminPrivilege(stmt.User, true)}
}
func (e *StatementExecutor) executeRevokeStatement(stmt *influxql.RevokeStatement) *influxql.Result {
priv := influxql.NoPrivileges
// Revoking all privileges means there's no need to look at existing user privileges.
if stmt.Privilege != influxql.AllPrivileges {
p, err := e.Store.UserPrivilege(stmt.User, stmt.On)
if err != nil {
return &influxql.Result{Err: err}
}
// Bit clear (AND NOT) the user's privilege with the revoked privilege.
priv = *p &^ stmt.Privilege
}
return &influxql.Result{Err: e.Store.SetPrivilege(stmt.User, stmt.On, priv)}
}
func (e *StatementExecutor) executeRevokeAdminStatement(stmt *influxql.RevokeAdminStatement) *influxql.Result {
return &influxql.Result{Err: e.Store.SetAdminPrivilege(stmt.User, false)}
}
func (e *StatementExecutor) executeCreateRetentionPolicyStatement(stmt *influxql.CreateRetentionPolicyStatement) *influxql.Result {
rpi := NewRetentionPolicyInfo(stmt.Name)
rpi.Duration = stmt.Duration
rpi.ReplicaN = stmt.Replication
// Create new retention policy.
_, err := e.Store.CreateRetentionPolicy(stmt.Database, rpi)
if err != nil {
return &influxql.Result{Err: err}
}
// If requested, set new policy as the default.
if stmt.Default {
err = e.Store.SetDefaultRetentionPolicy(stmt.Database, stmt.Name)
}
return &influxql.Result{Err: err}
}
func (e *StatementExecutor) executeAlterRetentionPolicyStatement(stmt *influxql.AlterRetentionPolicyStatement) *influxql.Result {
rpu := &RetentionPolicyUpdate{
Duration: stmt.Duration,
ReplicaN: stmt.Replication,
}
// Update the retention policy.
err := e.Store.UpdateRetentionPolicy(stmt.Database, stmt.Name, rpu)
if err != nil {
return &influxql.Result{Err: err}
}
// If requested, set as default retention policy.
if stmt.Default {
err = e.Store.SetDefaultRetentionPolicy(stmt.Database, stmt.Name)
}
return &influxql.Result{Err: err}
}
func (e *StatementExecutor) executeDropRetentionPolicyStatement(q *influxql.DropRetentionPolicyStatement) *influxql.Result {
return &influxql.Result{Err: e.Store.DropRetentionPolicy(q.Database, q.Name)}
}
func (e *StatementExecutor) executeShowRetentionPoliciesStatement(q *influxql.ShowRetentionPoliciesStatement) *influxql.Result {
di, err := e.Store.Database(q.Database)
if err != nil {
return &influxql.Result{Err: err}
} else if di == nil {
return &influxql.Result{Err: ErrDatabaseNotFound}
}
row := &influxql.Row{Columns: []string{"name", "duration", "replicaN", "default"}}
for _, rpi := range di.RetentionPolicies {
row.Values = append(row.Values, []interface{}{rpi.Name, rpi.Duration.String(), rpi.ReplicaN, di.DefaultRetentionPolicy == rpi.Name})
}
return &influxql.Result{Series: []*influxql.Row{row}}
}
func (e *StatementExecutor) executeCreateContinuousQueryStatement(q *influxql.CreateContinuousQueryStatement) *influxql.Result {
return &influxql.Result{
Err: e.Store.CreateContinuousQuery(q.Database, q.Name, q.String()),
}
}
func (e *StatementExecutor) executeDropContinuousQueryStatement(q *influxql.DropContinuousQueryStatement) *influxql.Result {
return &influxql.Result{
Err: e.Store.DropContinuousQuery(q.Database, q.Name),
}
}
func (e *StatementExecutor) executeShowContinuousQueriesStatement(stmt *influxql.ShowContinuousQueriesStatement) *influxql.Result {
dis, err := e.Store.Databases()
if err != nil {
return &influxql.Result{Err: err}
}
rows := []*influxql.Row{}
for _, di := range dis {
row := &influxql.Row{Columns: []string{"name", "query"}, Name: di.Name}
for _, cqi := range di.ContinuousQueries {
row.Values = append(row.Values, []interface{}{cqi.Name, cqi.Query})
}
rows = append(rows, row)
}
return &influxql.Result{Series: rows}
}
func (e *StatementExecutor) executeShowStatsStatement(stmt *influxql.ShowStatsStatement) *influxql.Result {
return &influxql.Result{Err: fmt.Errorf("SHOW STATS is not implemented yet")}
}