Creates a registration mechanism for FSM commands.

This commit is contained in:
James Phillips 2017-11-29 12:43:27 -08:00
parent 3e7ea1931c
commit 4eaee8e0ba
No known key found for this signature in database
GPG Key ID: 77183E682AC5FC11
4 changed files with 1457 additions and 1403 deletions

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@ -0,0 +1,263 @@
package fsm
import (
"fmt"
"time"
"github.com/armon/go-metrics"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/api"
)
func init() {
registerCommand(structs.RegisterRequestType, (*FSM).applyRegister)
registerCommand(structs.DeregisterRequestType, (*FSM).applyDeregister)
registerCommand(structs.KVSRequestType, (*FSM).applyKVSOperation)
registerCommand(structs.SessionRequestType, (*FSM).applySessionOperation)
registerCommand(structs.ACLRequestType, (*FSM).applyACLOperation)
registerCommand(structs.TombstoneRequestType, (*FSM).applyTombstoneOperation)
registerCommand(structs.CoordinateBatchUpdateType, (*FSM).applyCoordinateBatchUpdate)
registerCommand(structs.PreparedQueryRequestType, (*FSM).applyPreparedQueryOperation)
registerCommand(structs.TxnRequestType, (*FSM).applyTxn)
registerCommand(structs.AutopilotRequestType, (*FSM).applyAutopilotUpdate)
}
func (c *FSM) applyRegister(buf []byte, index uint64) interface{} {
defer metrics.MeasureSince([]string{"consul", "fsm", "register"}, time.Now())
defer metrics.MeasureSince([]string{"fsm", "register"}, time.Now())
var req structs.RegisterRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
// Apply all updates in a single transaction
if err := c.state.EnsureRegistration(index, &req); err != nil {
c.logger.Printf("[WARN] consul.fsm: EnsureRegistration failed: %v", err)
return err
}
return nil
}
func (c *FSM) applyDeregister(buf []byte, index uint64) interface{} {
defer metrics.MeasureSince([]string{"consul", "fsm", "deregister"}, time.Now())
defer metrics.MeasureSince([]string{"fsm", "deregister"}, time.Now())
var req structs.DeregisterRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
// Either remove the service entry or the whole node. The precedence
// here is also baked into vetDeregisterWithACL() in acl.go, so if you
// make changes here, be sure to also adjust the code over there.
if req.ServiceID != "" {
if err := c.state.DeleteService(index, req.Node, req.ServiceID); err != nil {
c.logger.Printf("[WARN] consul.fsm: DeleteNodeService failed: %v", err)
return err
}
} else if req.CheckID != "" {
if err := c.state.DeleteCheck(index, req.Node, req.CheckID); err != nil {
c.logger.Printf("[WARN] consul.fsm: DeleteNodeCheck failed: %v", err)
return err
}
} else {
if err := c.state.DeleteNode(index, req.Node); err != nil {
c.logger.Printf("[WARN] consul.fsm: DeleteNode failed: %v", err)
return err
}
}
return nil
}
func (c *FSM) applyKVSOperation(buf []byte, index uint64) interface{} {
var req structs.KVSRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSinceWithLabels([]string{"consul", "fsm", "kvs"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
defer metrics.MeasureSinceWithLabels([]string{"fsm", "kvs"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
switch req.Op {
case api.KVSet:
return c.state.KVSSet(index, &req.DirEnt)
case api.KVDelete:
return c.state.KVSDelete(index, req.DirEnt.Key)
case api.KVDeleteCAS:
act, err := c.state.KVSDeleteCAS(index, req.DirEnt.ModifyIndex, req.DirEnt.Key)
if err != nil {
return err
}
return act
case api.KVDeleteTree:
return c.state.KVSDeleteTree(index, req.DirEnt.Key)
case api.KVCAS:
act, err := c.state.KVSSetCAS(index, &req.DirEnt)
if err != nil {
return err
}
return act
case api.KVLock:
act, err := c.state.KVSLock(index, &req.DirEnt)
if err != nil {
return err
}
return act
case api.KVUnlock:
act, err := c.state.KVSUnlock(index, &req.DirEnt)
if err != nil {
return err
}
return act
default:
err := fmt.Errorf("Invalid KVS operation '%s'", req.Op)
c.logger.Printf("[WARN] consul.fsm: %v", err)
return err
}
}
func (c *FSM) applySessionOperation(buf []byte, index uint64) interface{} {
var req structs.SessionRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSinceWithLabels([]string{"consul", "fsm", "session"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
defer metrics.MeasureSinceWithLabels([]string{"fsm", "session"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
switch req.Op {
case structs.SessionCreate:
if err := c.state.SessionCreate(index, &req.Session); err != nil {
return err
}
return req.Session.ID
case structs.SessionDestroy:
return c.state.SessionDestroy(index, req.Session.ID)
default:
c.logger.Printf("[WARN] consul.fsm: Invalid Session operation '%s'", req.Op)
return fmt.Errorf("Invalid Session operation '%s'", req.Op)
}
}
func (c *FSM) applyACLOperation(buf []byte, index uint64) interface{} {
var req structs.ACLRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSinceWithLabels([]string{"consul", "fsm", "acl"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
defer metrics.MeasureSinceWithLabels([]string{"fsm", "acl"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
switch req.Op {
case structs.ACLBootstrapInit:
enabled, err := c.state.ACLBootstrapInit(index)
if err != nil {
return err
}
return enabled
case structs.ACLBootstrapNow:
if err := c.state.ACLBootstrap(index, &req.ACL); err != nil {
return err
}
return &req.ACL
case structs.ACLForceSet, structs.ACLSet:
if err := c.state.ACLSet(index, &req.ACL); err != nil {
return err
}
return req.ACL.ID
case structs.ACLDelete:
return c.state.ACLDelete(index, req.ACL.ID)
default:
c.logger.Printf("[WARN] consul.fsm: Invalid ACL operation '%s'", req.Op)
return fmt.Errorf("Invalid ACL operation '%s'", req.Op)
}
}
func (c *FSM) applyTombstoneOperation(buf []byte, index uint64) interface{} {
var req structs.TombstoneRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSinceWithLabels([]string{"consul", "fsm", "tombstone"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
defer metrics.MeasureSinceWithLabels([]string{"fsm", "tombstone"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
switch req.Op {
case structs.TombstoneReap:
return c.state.ReapTombstones(req.ReapIndex)
default:
c.logger.Printf("[WARN] consul.fsm: Invalid Tombstone operation '%s'", req.Op)
return fmt.Errorf("Invalid Tombstone operation '%s'", req.Op)
}
}
// applyCoordinateBatchUpdate processes a batch of coordinate updates and applies
// them in a single underlying transaction. This interface isn't 1:1 with the outer
// update interface that the coordinate endpoint exposes, so we made it single
// purpose and avoided the opcode convention.
func (c *FSM) applyCoordinateBatchUpdate(buf []byte, index uint64) interface{} {
var updates structs.Coordinates
if err := structs.Decode(buf, &updates); err != nil {
panic(fmt.Errorf("failed to decode batch updates: %v", err))
}
defer metrics.MeasureSince([]string{"consul", "fsm", "coordinate", "batch-update"}, time.Now())
defer metrics.MeasureSince([]string{"fsm", "coordinate", "batch-update"}, time.Now())
if err := c.state.CoordinateBatchUpdate(index, updates); err != nil {
return err
}
return nil
}
// applyPreparedQueryOperation applies the given prepared query operation to the
// state store.
func (c *FSM) applyPreparedQueryOperation(buf []byte, index uint64) interface{} {
var req structs.PreparedQueryRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSinceWithLabels([]string{"consul", "fsm", "prepared-query"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
defer metrics.MeasureSinceWithLabels([]string{"fsm", "prepared-query"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
switch req.Op {
case structs.PreparedQueryCreate, structs.PreparedQueryUpdate:
return c.state.PreparedQuerySet(index, req.Query)
case structs.PreparedQueryDelete:
return c.state.PreparedQueryDelete(index, req.Query.ID)
default:
c.logger.Printf("[WARN] consul.fsm: Invalid PreparedQuery operation '%s'", req.Op)
return fmt.Errorf("Invalid PreparedQuery operation '%s'", req.Op)
}
}
func (c *FSM) applyTxn(buf []byte, index uint64) interface{} {
var req structs.TxnRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSince([]string{"consul", "fsm", "txn"}, time.Now())
defer metrics.MeasureSince([]string{"fsm", "txn"}, time.Now())
results, errors := c.state.TxnRW(index, req.Ops)
return structs.TxnResponse{
Results: results,
Errors: errors,
}
}
func (c *FSM) applyAutopilotUpdate(buf []byte, index uint64) interface{} {
var req structs.AutopilotSetConfigRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSince([]string{"consul", "fsm", "autopilot"}, time.Now())
defer metrics.MeasureSince([]string{"fsm", "autopilot"}, time.Now())
if req.CAS {
act, err := c.state.AutopilotCASConfig(index, req.Config.ModifyIndex, &req.Config)
if err != nil {
return err
}
return act
}
return c.state.AutopilotSetConfig(index, &req.Config)
}

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@ -10,7 +10,6 @@ import (
"github.com/armon/go-metrics"
"github.com/hashicorp/consul/agent/consul/state"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/go-msgpack/codec"
"github.com/hashicorp/raft"
)
@ -18,6 +17,28 @@ import (
// msgpackHandle is a shared handle for encoding/decoding msgpack payloads
var msgpackHandle = &codec.MsgpackHandle{}
// command is a command method on the FSM.
type command func(buf []byte, index uint64) interface{}
// unboundCommand is a command method on the FSM, not yet bound to an FSM
// instance.
type unboundCommand func(c *FSM, buf []byte, index uint64) interface{}
// commands is a map from message type to unbound command.
var commands map[structs.MessageType]unboundCommand
// registerCommand registers a new command with the FSM, which should be done
// at package init() time.
func registerCommand(msg structs.MessageType, fn unboundCommand) {
if commands == nil {
commands = make(map[structs.MessageType]unboundCommand)
}
if commands[msg] != nil {
panic(fmt.Errorf("Message %d is already registered", msg))
}
commands[msg] = fn
}
// FSM implements a finite state machine that is used
// along with Raft to provide strong consistency. We implement
// this outside the Server to avoid exposing this outside the package.
@ -26,6 +47,10 @@ type FSM struct {
logger *log.Logger
path string
// apply is built off the commands global and is used to route apply
// operations to their appropriate handlers.
apply map[structs.MessageType]command
// stateLock is only used to protect outside callers to State() from
// racing with Restore(), which is called by Raft (it puts in a totally
// new state store). Everything internal here is synchronized by the
@ -60,9 +85,19 @@ func New(gc *state.TombstoneGC, logOutput io.Writer) (*FSM, error) {
fsm := &FSM{
logOutput: logOutput,
logger: log.New(logOutput, "", log.LstdFlags),
apply: make(map[structs.MessageType]command),
state: stateNew,
gc: gc,
}
// Build out the apply dispatch table based on the registered commands.
for msg, fn := range commands {
thisFn := fn
fsm.apply[msg] = func(buf []byte, index uint64) interface{} {
return thisFn(fsm, buf, index)
}
}
return fsm, nil
}
@ -86,274 +121,18 @@ func (c *FSM) Apply(log *raft.Log) interface{} {
ignoreUnknown = true
}
switch msgType {
case structs.RegisterRequestType:
return c.applyRegister(buf[1:], log.Index)
case structs.DeregisterRequestType:
return c.applyDeregister(buf[1:], log.Index)
case structs.KVSRequestType:
return c.applyKVSOperation(buf[1:], log.Index)
case structs.SessionRequestType:
return c.applySessionOperation(buf[1:], log.Index)
case structs.ACLRequestType:
return c.applyACLOperation(buf[1:], log.Index)
case structs.TombstoneRequestType:
return c.applyTombstoneOperation(buf[1:], log.Index)
case structs.CoordinateBatchUpdateType:
return c.applyCoordinateBatchUpdate(buf[1:], log.Index)
case structs.PreparedQueryRequestType:
return c.applyPreparedQueryOperation(buf[1:], log.Index)
case structs.TxnRequestType:
return c.applyTxn(buf[1:], log.Index)
case structs.AutopilotRequestType:
return c.applyAutopilotUpdate(buf[1:], log.Index)
default:
// Apply based on the dispatch table, if possible.
if fn, ok := c.apply[msgType]; ok {
return fn(buf[1:], log.Index)
}
// Otherwise, see if it's safe to ignore. If not, we have to panic so
// that we crash and our state doesn't diverge.
if ignoreUnknown {
c.logger.Printf("[WARN] consul.fsm: ignoring unknown message type (%d), upgrade to newer version", msgType)
return nil
}
panic(fmt.Errorf("failed to apply request: %#v", buf))
}
}
func (c *FSM) applyRegister(buf []byte, index uint64) interface{} {
defer metrics.MeasureSince([]string{"consul", "fsm", "register"}, time.Now())
defer metrics.MeasureSince([]string{"fsm", "register"}, time.Now())
var req structs.RegisterRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
// Apply all updates in a single transaction
if err := c.state.EnsureRegistration(index, &req); err != nil {
c.logger.Printf("[WARN] consul.fsm: EnsureRegistration failed: %v", err)
return err
}
return nil
}
func (c *FSM) applyDeregister(buf []byte, index uint64) interface{} {
defer metrics.MeasureSince([]string{"consul", "fsm", "deregister"}, time.Now())
defer metrics.MeasureSince([]string{"fsm", "deregister"}, time.Now())
var req structs.DeregisterRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
// Either remove the service entry or the whole node. The precedence
// here is also baked into vetDeregisterWithACL() in acl.go, so if you
// make changes here, be sure to also adjust the code over there.
if req.ServiceID != "" {
if err := c.state.DeleteService(index, req.Node, req.ServiceID); err != nil {
c.logger.Printf("[WARN] consul.fsm: DeleteNodeService failed: %v", err)
return err
}
} else if req.CheckID != "" {
if err := c.state.DeleteCheck(index, req.Node, req.CheckID); err != nil {
c.logger.Printf("[WARN] consul.fsm: DeleteNodeCheck failed: %v", err)
return err
}
} else {
if err := c.state.DeleteNode(index, req.Node); err != nil {
c.logger.Printf("[WARN] consul.fsm: DeleteNode failed: %v", err)
return err
}
}
return nil
}
func (c *FSM) applyKVSOperation(buf []byte, index uint64) interface{} {
var req structs.KVSRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSinceWithLabels([]string{"consul", "fsm", "kvs"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
defer metrics.MeasureSinceWithLabels([]string{"fsm", "kvs"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
switch req.Op {
case api.KVSet:
return c.state.KVSSet(index, &req.DirEnt)
case api.KVDelete:
return c.state.KVSDelete(index, req.DirEnt.Key)
case api.KVDeleteCAS:
act, err := c.state.KVSDeleteCAS(index, req.DirEnt.ModifyIndex, req.DirEnt.Key)
if err != nil {
return err
}
return act
case api.KVDeleteTree:
return c.state.KVSDeleteTree(index, req.DirEnt.Key)
case api.KVCAS:
act, err := c.state.KVSSetCAS(index, &req.DirEnt)
if err != nil {
return err
}
return act
case api.KVLock:
act, err := c.state.KVSLock(index, &req.DirEnt)
if err != nil {
return err
}
return act
case api.KVUnlock:
act, err := c.state.KVSUnlock(index, &req.DirEnt)
if err != nil {
return err
}
return act
default:
err := fmt.Errorf("Invalid KVS operation '%s'", req.Op)
c.logger.Printf("[WARN] consul.fsm: %v", err)
return err
}
}
func (c *FSM) applySessionOperation(buf []byte, index uint64) interface{} {
var req structs.SessionRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSinceWithLabels([]string{"consul", "fsm", "session"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
defer metrics.MeasureSinceWithLabels([]string{"fsm", "session"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
switch req.Op {
case structs.SessionCreate:
if err := c.state.SessionCreate(index, &req.Session); err != nil {
return err
}
return req.Session.ID
case structs.SessionDestroy:
return c.state.SessionDestroy(index, req.Session.ID)
default:
c.logger.Printf("[WARN] consul.fsm: Invalid Session operation '%s'", req.Op)
return fmt.Errorf("Invalid Session operation '%s'", req.Op)
}
}
func (c *FSM) applyACLOperation(buf []byte, index uint64) interface{} {
var req structs.ACLRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSinceWithLabels([]string{"consul", "fsm", "acl"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
defer metrics.MeasureSinceWithLabels([]string{"fsm", "acl"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
switch req.Op {
case structs.ACLBootstrapInit:
enabled, err := c.state.ACLBootstrapInit(index)
if err != nil {
return err
}
return enabled
case structs.ACLBootstrapNow:
if err := c.state.ACLBootstrap(index, &req.ACL); err != nil {
return err
}
return &req.ACL
case structs.ACLForceSet, structs.ACLSet:
if err := c.state.ACLSet(index, &req.ACL); err != nil {
return err
}
return req.ACL.ID
case structs.ACLDelete:
return c.state.ACLDelete(index, req.ACL.ID)
default:
c.logger.Printf("[WARN] consul.fsm: Invalid ACL operation '%s'", req.Op)
return fmt.Errorf("Invalid ACL operation '%s'", req.Op)
}
}
func (c *FSM) applyTombstoneOperation(buf []byte, index uint64) interface{} {
var req structs.TombstoneRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSinceWithLabels([]string{"consul", "fsm", "tombstone"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
defer metrics.MeasureSinceWithLabels([]string{"fsm", "tombstone"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
switch req.Op {
case structs.TombstoneReap:
return c.state.ReapTombstones(req.ReapIndex)
default:
c.logger.Printf("[WARN] consul.fsm: Invalid Tombstone operation '%s'", req.Op)
return fmt.Errorf("Invalid Tombstone operation '%s'", req.Op)
}
}
// applyCoordinateBatchUpdate processes a batch of coordinate updates and applies
// them in a single underlying transaction. This interface isn't 1:1 with the outer
// update interface that the coordinate endpoint exposes, so we made it single
// purpose and avoided the opcode convention.
func (c *FSM) applyCoordinateBatchUpdate(buf []byte, index uint64) interface{} {
var updates structs.Coordinates
if err := structs.Decode(buf, &updates); err != nil {
panic(fmt.Errorf("failed to decode batch updates: %v", err))
}
defer metrics.MeasureSince([]string{"consul", "fsm", "coordinate", "batch-update"}, time.Now())
defer metrics.MeasureSince([]string{"fsm", "coordinate", "batch-update"}, time.Now())
if err := c.state.CoordinateBatchUpdate(index, updates); err != nil {
return err
}
return nil
}
// applyPreparedQueryOperation applies the given prepared query operation to the
// state store.
func (c *FSM) applyPreparedQueryOperation(buf []byte, index uint64) interface{} {
var req structs.PreparedQueryRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSinceWithLabels([]string{"consul", "fsm", "prepared-query"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
defer metrics.MeasureSinceWithLabels([]string{"fsm", "prepared-query"}, time.Now(),
[]metrics.Label{{Name: "op", Value: string(req.Op)}})
switch req.Op {
case structs.PreparedQueryCreate, structs.PreparedQueryUpdate:
return c.state.PreparedQuerySet(index, req.Query)
case structs.PreparedQueryDelete:
return c.state.PreparedQueryDelete(index, req.Query.ID)
default:
c.logger.Printf("[WARN] consul.fsm: Invalid PreparedQuery operation '%s'", req.Op)
return fmt.Errorf("Invalid PreparedQuery operation '%s'", req.Op)
}
}
func (c *FSM) applyTxn(buf []byte, index uint64) interface{} {
var req structs.TxnRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSince([]string{"consul", "fsm", "txn"}, time.Now())
defer metrics.MeasureSince([]string{"fsm", "txn"}, time.Now())
results, errors := c.state.TxnRW(index, req.Ops)
return structs.TxnResponse{
Results: results,
Errors: errors,
}
}
func (c *FSM) applyAutopilotUpdate(buf []byte, index uint64) interface{} {
var req structs.AutopilotSetConfigRequest
if err := structs.Decode(buf, &req); err != nil {
panic(fmt.Errorf("failed to decode request: %v", err))
}
defer metrics.MeasureSince([]string{"consul", "fsm", "autopilot"}, time.Now())
defer metrics.MeasureSince([]string{"fsm", "autopilot"}, time.Now())
if req.CAS {
act, err := c.state.AutopilotCASConfig(index, req.Config.ModifyIndex, &req.Config)
if err != nil {
return err
}
return act
}
return c.state.AutopilotSetConfig(index, &req.Config)
}
func (c *FSM) Snapshot() (raft.FSMSnapshot, error) {

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