/
state.go
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/
state.go
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// Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package api
import (
"net"
"strconv"
"github.com/juju/errors"
"github.com/juju/names"
"github.com/juju/juju/api/agent"
"github.com/juju/juju/api/base"
"github.com/juju/juju/api/charmrevisionupdater"
"github.com/juju/juju/api/cleaner"
"github.com/juju/juju/api/deployer"
"github.com/juju/juju/api/diskmanager"
"github.com/juju/juju/api/environment"
"github.com/juju/juju/api/firewaller"
"github.com/juju/juju/api/instancepoller"
"github.com/juju/juju/api/keyupdater"
apilogger "github.com/juju/juju/api/logger"
"github.com/juju/juju/api/machiner"
"github.com/juju/juju/api/networker"
"github.com/juju/juju/api/provisioner"
"github.com/juju/juju/api/reboot"
"github.com/juju/juju/api/resumer"
"github.com/juju/juju/api/rsyslog"
"github.com/juju/juju/api/storageprovisioner"
"github.com/juju/juju/api/uniter"
"github.com/juju/juju/api/upgrader"
"github.com/juju/juju/apiserver/params"
"github.com/juju/juju/network"
"github.com/juju/juju/version"
)
// Login authenticates as the entity with the given name and password.
// Subsequent requests on the state will act as that entity. This
// method is usually called automatically by Open. The machine nonce
// should be empty unless logging in as a machine agent.
func (st *State) Login(tag, password, nonce string) error {
err := st.loginV2(tag, password, nonce)
if params.IsCodeNotImplemented(err) {
err = st.loginV1(tag, password, nonce)
if params.IsCodeNotImplemented(err) {
// TODO (cmars): remove fallback once we can drop v0 compatibility
return st.loginV0(tag, password, nonce)
}
}
return err
}
func (st *State) loginV2(tag, password, nonce string) error {
var result params.LoginResultV1
request := ¶ms.LoginRequest{
AuthTag: tag,
Credentials: password,
Nonce: nonce,
}
err := st.APICall("Admin", 2, "", "Login", request, &result)
if err != nil {
// If the server complains about an empty tag it may be that we are
// talking to an older server version that does not understand facades and
// expects a params.Creds request instead of a params.LoginRequest. We
// return a CodNotImplemented error to force login down to V1, which
// supports older server logins. This may mask an actual empty tag in
// params.LoginRequest, but that would be picked up in loginV1. V1 will
// also produce a warning that we are ignoring an invalid API, so we do not
// need to add one here.
if err.Error() == `"" is not a valid tag` {
return ¶ms.Error{
Message: err.Error(),
Code: params.CodeNotImplemented,
}
}
return errors.Trace(err)
}
servers := params.NetworkHostsPorts(result.Servers)
err = st.setLoginResult(tag, result.EnvironTag, result.ServerTag, servers, result.Facades)
if err != nil {
return errors.Trace(err)
}
st.serverVersion, err = version.Parse(result.ServerVersion)
if err != nil {
return errors.Trace(err)
}
return nil
}
func (st *State) loginV1(tag, password, nonce string) error {
var result struct {
// TODO (cmars): remove once we can drop 1.18 login compatibility
params.LoginResult
params.LoginResultV1
}
err := st.APICall("Admin", 1, "", "Login", ¶ms.LoginRequestCompat{
LoginRequest: params.LoginRequest{
AuthTag: tag,
Credentials: password,
Nonce: nonce,
},
// TODO (cmars): remove once we can drop 1.18 login compatibility
Creds: params.Creds{
AuthTag: tag,
Password: password,
Nonce: nonce,
},
}, &result)
if err != nil {
return err
}
// We've either logged into an Admin v1 facade, or a pre-facade (1.18) API
// server. The JSON field names between the structures are disjoint, so only
// one should have an environ tag set.
var environTag string
var serverTag string
var servers [][]network.HostPort
var facades []params.FacadeVersions
// For quite old servers, it is possible that they don't send down
// the environTag.
if result.LoginResult.EnvironTag != "" {
environTag = result.LoginResult.EnvironTag
// If the server doesn't support login v1, it doesn't support
// multiple environments, so don't store a server tag.
servers = params.NetworkHostsPorts(result.LoginResult.Servers)
facades = result.LoginResult.Facades
} else if result.LoginResultV1.EnvironTag != "" {
environTag = result.LoginResultV1.EnvironTag
serverTag = result.LoginResultV1.ServerTag
servers = params.NetworkHostsPorts(result.LoginResultV1.Servers)
facades = result.LoginResultV1.Facades
}
err = st.setLoginResult(tag, environTag, serverTag, servers, facades)
if err != nil {
return err
}
return nil
}
func (st *State) setLoginResult(tag, environTag, serverTag string, servers [][]network.HostPort, facades []params.FacadeVersions) error {
authtag, err := names.ParseTag(tag)
if err != nil {
return err
}
st.authTag = authtag
st.environTag = environTag
st.serverTag = serverTag
hostPorts, err := addAddress(servers, st.addr)
if err != nil {
if clerr := st.Close(); clerr != nil {
err = errors.Annotatef(err, "error closing state: %v", clerr)
}
return err
}
st.hostPorts = hostPorts
st.facadeVersions = make(map[string][]int, len(facades))
for _, facade := range facades {
st.facadeVersions[facade.Name] = facade.Versions
}
return nil
}
func (st *State) loginV0(tag, password, nonce string) error {
var result params.LoginResult
err := st.APICall("Admin", 0, "", "Login", ¶ms.Creds{
AuthTag: tag,
Password: password,
Nonce: nonce,
}, &result)
if err != nil {
return err
}
servers := params.NetworkHostsPorts(result.Servers)
// Don't set a server tag.
if err = st.setLoginResult(tag, result.EnvironTag, "", servers, result.Facades); err != nil {
return err
}
return nil
}
// slideAddressToFront moves the address at the location (serverIndex, addrIndex) to be
// the first address of the first server.
func slideAddressToFront(servers [][]network.HostPort, serverIndex, addrIndex int) {
server := servers[serverIndex]
hostPort := server[addrIndex]
// Move the matching address to be the first in this server
for ; addrIndex > 0; addrIndex-- {
server[addrIndex] = server[addrIndex-1]
}
server[0] = hostPort
for ; serverIndex > 0; serverIndex-- {
servers[serverIndex] = servers[serverIndex-1]
}
servers[0] = server
}
// addAddress appends a new server derived from the given
// address to servers if the address is not already found
// there.
func addAddress(servers [][]network.HostPort, addr string) ([][]network.HostPort, error) {
for i, server := range servers {
for j, hostPort := range server {
if hostPort.NetAddr() == addr {
slideAddressToFront(servers, i, j)
return servers, nil
}
}
}
host, portString, err := net.SplitHostPort(addr)
if err != nil {
return nil, err
}
port, err := strconv.Atoi(portString)
if err != nil {
return nil, err
}
result := make([][]network.HostPort, 0, len(servers)+1)
result = append(result, network.NewHostPorts(port, host))
result = append(result, servers...)
return result, nil
}
// Client returns an object that can be used
// to access client-specific functionality.
func (st *State) Client() *Client {
frontend, backend := base.NewClientFacade(st, "Client")
return &Client{ClientFacade: frontend, facade: backend, st: st}
}
// Machiner returns a version of the state that provides functionality
// required by the machiner worker.
func (st *State) Machiner() *machiner.State {
return machiner.NewState(st)
}
// Resumer returns a version of the state that provides functionality
// required by the resumer worker.
func (st *State) Resumer() *resumer.API {
return resumer.NewAPI(st)
}
// Networker returns a version of the state that provides functionality
// required by the networker worker.
func (st *State) Networker() networker.State {
return networker.NewState(st)
}
// Provisioner returns a version of the state that provides functionality
// required by the provisioner worker.
func (st *State) Provisioner() *provisioner.State {
return provisioner.NewState(st)
}
// Uniter returns a version of the state that provides functionality
// required by the uniter worker.
func (st *State) Uniter() (*uniter.State, error) {
unitTag, ok := st.authTag.(names.UnitTag)
if !ok {
return nil, errors.Errorf("expected UnitTag, got %T %v", st.authTag, st.authTag)
}
return uniter.NewState(st, unitTag), nil
}
// DiskManager returns a version of the state that provides functionality
// required by the diskmanager worker.
func (st *State) DiskManager() (*diskmanager.State, error) {
machineTag, ok := st.authTag.(names.MachineTag)
if !ok {
return nil, errors.Errorf("expected MachineTag, got %#v", st.authTag)
}
return diskmanager.NewState(st, machineTag), nil
}
// StorageProvisioner returns a version of the state that provides
// functionality required by the storageprovisioner worker.
// The scope tag defines the type of storage that is provisioned, either
// either attached directly to a specified machine (machine scoped),
// or provisioned on the underlying cloud for use by any machine in a
// specified environment (environ scoped).
func (st *State) StorageProvisioner(scope names.Tag) *storageprovisioner.State {
return storageprovisioner.NewState(st, scope)
}
// Firewaller returns a version of the state that provides functionality
// required by the firewaller worker.
func (st *State) Firewaller() *firewaller.State {
return firewaller.NewState(st)
}
// Agent returns a version of the state that provides
// functionality required by the agent code.
func (st *State) Agent() *agent.State {
return agent.NewState(st)
}
// Upgrader returns access to the Upgrader API
func (st *State) Upgrader() *upgrader.State {
return upgrader.NewState(st)
}
// Reboot returns access to the Reboot API
func (st *State) Reboot() (*reboot.State, error) {
switch tag := st.authTag.(type) {
case names.MachineTag:
return reboot.NewState(st, tag), nil
default:
return nil, errors.Errorf("expected names.MachineTag, got %T", tag)
}
}
// Deployer returns access to the Deployer API
func (st *State) Deployer() *deployer.State {
return deployer.NewState(st)
}
// Environment returns access to the Environment API
func (st *State) Environment() *environment.Facade {
return environment.NewFacade(st)
}
// Logger returns access to the Logger API
func (st *State) Logger() *apilogger.State {
return apilogger.NewState(st)
}
// KeyUpdater returns access to the KeyUpdater API
func (st *State) KeyUpdater() *keyupdater.State {
return keyupdater.NewState(st)
}
// InstancePoller returns access to the InstancePoller API
func (st *State) InstancePoller() *instancepoller.API {
return instancepoller.NewAPI(st)
}
// CharmRevisionUpdater returns access to the CharmRevisionUpdater API
func (st *State) CharmRevisionUpdater() *charmrevisionupdater.State {
return charmrevisionupdater.NewState(st)
}
// Cleaner returns a version of the state that provides access to the cleaner API
func (st *State) Cleaner() *cleaner.API {
return cleaner.NewAPI(st)
}
// Rsyslog returns access to the Rsyslog API
func (st *State) Rsyslog() *rsyslog.State {
return rsyslog.NewState(st)
}
// ServerVersion holds the version of the API server that we are connected to.
// It is possible that this version is Zero if the server does not report this
// during login. The second result argument indicates if the version number is
// set.
func (st *State) ServerVersion() (version.Number, bool) {
return st.serverVersion, st.serverVersion != version.Zero
}