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structs.go
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structs.go
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package structs
import (
"bytes"
"fmt"
"math/rand"
"reflect"
"regexp"
"strings"
"time"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/types"
"github.com/hashicorp/go-msgpack/codec"
"github.com/hashicorp/serf/coordinate"
)
var (
ErrNoLeader = fmt.Errorf("No cluster leader")
ErrNoDCPath = fmt.Errorf("No path to datacenter")
ErrNoServers = fmt.Errorf("No known Consul servers")
ErrNotReadyForConsistentReads = fmt.Errorf("Not ready to serve consistent reads")
)
type MessageType uint8
// RaftIndex is used to track the index used while creating
// or modifying a given struct type.
type RaftIndex struct {
CreateIndex uint64
ModifyIndex uint64
}
// These are serialized between Consul servers and stored in Consul snapshots,
// so entries must only ever be added.
const (
RegisterRequestType MessageType = 0
DeregisterRequestType = 1
KVSRequestType = 2
SessionRequestType = 3
ACLRequestType = 4
TombstoneRequestType = 5
CoordinateBatchUpdateType = 6
PreparedQueryRequestType = 7
TxnRequestType = 8
AutopilotRequestType = 9
AreaRequestType = 10
ACLBootstrapRequestType = 11 // FSM snapshots only.
)
const (
// IgnoreUnknownTypeFlag is set along with a MessageType
// to indicate that the message type can be safely ignored
// if it is not recognized. This is for future proofing, so
// that new commands can be added in a way that won't cause
// old servers to crash when the FSM attempts to process them.
IgnoreUnknownTypeFlag MessageType = 128
// NodeMaint is the special key set by a node in maintenance mode.
NodeMaint = "_node_maintenance"
// ServiceMaintPrefix is the prefix for a service in maintenance mode.
ServiceMaintPrefix = "_service_maintenance:"
// The meta key prefix reserved for Consul's internal use
metaKeyReservedPrefix = "consul-"
// metaMaxKeyPairs is maximum number of metadata key pairs allowed to be registered
metaMaxKeyPairs = 64
// metaKeyMaxLength is the maximum allowed length of a metadata key
metaKeyMaxLength = 128
// metaValueMaxLength is the maximum allowed length of a metadata value
metaValueMaxLength = 512
// MaxLockDelay provides a maximum LockDelay value for
// a session. Any value above this will not be respected.
MaxLockDelay = 60 * time.Second
)
// metaKeyFormat checks if a metadata key string is valid
var metaKeyFormat = regexp.MustCompile(`^[a-zA-Z0-9_-]+$`).MatchString
func ValidStatus(s string) bool {
return s == api.HealthPassing || s == api.HealthWarning || s == api.HealthCritical
}
// RPCInfo is used to describe common information about query
type RPCInfo interface {
RequestDatacenter() string
IsRead() bool
AllowStaleRead() bool
ACLToken() string
}
// QueryOptions is used to specify various flags for read queries
type QueryOptions struct {
// Token is the ACL token ID. If not provided, the 'anonymous'
// token is assumed for backwards compatibility.
Token string
// If set, wait until query exceeds given index. Must be provided
// with MaxQueryTime.
MinQueryIndex uint64
// Provided with MinQueryIndex to wait for change.
MaxQueryTime time.Duration
// If set, any follower can service the request. Results
// may be arbitrarily stale.
AllowStale bool
// If set, the leader must verify leadership prior to
// servicing the request. Prevents a stale read.
RequireConsistent bool
}
// IsRead is always true for QueryOption.
func (q QueryOptions) IsRead() bool {
return true
}
func (q QueryOptions) AllowStaleRead() bool {
return q.AllowStale
}
func (q QueryOptions) ACLToken() string {
return q.Token
}
type WriteRequest struct {
// Token is the ACL token ID. If not provided, the 'anonymous'
// token is assumed for backwards compatibility.
Token string
}
// WriteRequest only applies to writes, always false
func (w WriteRequest) IsRead() bool {
return false
}
func (w WriteRequest) AllowStaleRead() bool {
return false
}
func (w WriteRequest) ACLToken() string {
return w.Token
}
// QueryMeta allows a query response to include potentially
// useful metadata about a query
type QueryMeta struct {
// This is the index associated with the read
Index uint64
// If AllowStale is used, this is time elapsed since
// last contact between the follower and leader. This
// can be used to gauge staleness.
LastContact time.Duration
// Used to indicate if there is a known leader node
KnownLeader bool
}
// RegisterRequest is used for the Catalog.Register endpoint
// to register a node as providing a service. If no service
// is provided, the node is registered.
type RegisterRequest struct {
Datacenter string
ID types.NodeID
Node string
Address string
TaggedAddresses map[string]string
NodeMeta map[string]string
Service *NodeService
Check *HealthCheck
Checks HealthChecks
// SkipNodeUpdate can be used when a register request is intended for
// updating a service and/or checks, but doesn't want to overwrite any
// node information if the node is already registered. If the node
// doesn't exist, it will still be created, but if the node exists, any
// node portion of this update will not apply.
SkipNodeUpdate bool
WriteRequest
}
func (r *RegisterRequest) RequestDatacenter() string {
return r.Datacenter
}
// ChangesNode returns true if the given register request changes the given
// node, which can be nil. This only looks for changes to the node record itself,
// not any of the health checks.
func (r *RegisterRequest) ChangesNode(node *Node) bool {
// This means it's creating the node.
if node == nil {
return true
}
// If we've been asked to skip the node update, then say there are no
// changes.
if r.SkipNodeUpdate {
return false
}
// Check if any of the node-level fields are being changed.
if r.ID != node.ID ||
r.Node != node.Node ||
r.Address != node.Address ||
r.Datacenter != node.Datacenter ||
!reflect.DeepEqual(r.TaggedAddresses, node.TaggedAddresses) ||
!reflect.DeepEqual(r.NodeMeta, node.Meta) {
return true
}
return false
}
// DeregisterRequest is used for the Catalog.Deregister endpoint
// to deregister a node as providing a service. If no service is
// provided the entire node is deregistered.
type DeregisterRequest struct {
Datacenter string
Node string
ServiceID string
CheckID types.CheckID
WriteRequest
}
func (r *DeregisterRequest) RequestDatacenter() string {
return r.Datacenter
}
// QuerySource is used to pass along information about the source node
// in queries so that we can adjust the response based on its network
// coordinates.
type QuerySource struct {
Datacenter string
Node string
}
// DCSpecificRequest is used to query about a specific DC
type DCSpecificRequest struct {
Datacenter string
NodeMetaFilters map[string]string
Source QuerySource
QueryOptions
}
func (r *DCSpecificRequest) RequestDatacenter() string {
return r.Datacenter
}
// ServiceSpecificRequest is used to query about a specific service
type ServiceSpecificRequest struct {
Datacenter string
NodeMetaFilters map[string]string
ServiceName string
ServiceTag string
TagFilter bool // Controls tag filtering
Source QuerySource
QueryOptions
}
func (r *ServiceSpecificRequest) RequestDatacenter() string {
return r.Datacenter
}
// NodeSpecificRequest is used to request the information about a single node
type NodeSpecificRequest struct {
Datacenter string
Node string
QueryOptions
}
func (r *NodeSpecificRequest) RequestDatacenter() string {
return r.Datacenter
}
// ChecksInStateRequest is used to query for nodes in a state
type ChecksInStateRequest struct {
Datacenter string
NodeMetaFilters map[string]string
State string
Source QuerySource
QueryOptions
}
func (r *ChecksInStateRequest) RequestDatacenter() string {
return r.Datacenter
}
// Used to return information about a node
type Node struct {
ID types.NodeID
Node string
Address string
Datacenter string
TaggedAddresses map[string]string
Meta map[string]string
RaftIndex
}
type Nodes []*Node
// ValidateMeta validates a set of key/value pairs from the agent config
func ValidateMetadata(meta map[string]string) error {
if len(meta) > metaMaxKeyPairs {
return fmt.Errorf("Node metadata cannot contain more than %d key/value pairs", metaMaxKeyPairs)
}
for key, value := range meta {
if err := validateMetaPair(key, value); err != nil {
return fmt.Errorf("Couldn't load metadata pair ('%s', '%s'): %s", key, value, err)
}
}
return nil
}
// validateMetaPair checks that the given key/value pair is in a valid format
func validateMetaPair(key, value string) error {
if key == "" {
return fmt.Errorf("Key cannot be blank")
}
if !metaKeyFormat(key) {
return fmt.Errorf("Key contains invalid characters")
}
if len(key) > metaKeyMaxLength {
return fmt.Errorf("Key is too long (limit: %d characters)", metaKeyMaxLength)
}
if strings.HasPrefix(key, metaKeyReservedPrefix) {
return fmt.Errorf("Key prefix '%s' is reserved for internal use", metaKeyReservedPrefix)
}
if len(value) > metaValueMaxLength {
return fmt.Errorf("Value is too long (limit: %d characters)", metaValueMaxLength)
}
return nil
}
// SatisfiesMetaFilters returns true if the metadata map contains the given filters
func SatisfiesMetaFilters(meta map[string]string, filters map[string]string) bool {
for key, value := range filters {
if v, ok := meta[key]; !ok || v != value {
return false
}
}
return true
}
// Used to return information about a provided services.
// Maps service name to available tags
type Services map[string][]string
// ServiceNode represents a node that is part of a service. ID, Address,
// TaggedAddresses, and NodeMeta are node-related fields that are always empty
// in the state store and are filled in on the way out by parseServiceNodes().
// This is also why PartialClone() skips them, because we know they are blank
// already so it would be a waste of time to copy them.
type ServiceNode struct {
ID types.NodeID
Node string
Address string
Datacenter string
TaggedAddresses map[string]string
NodeMeta map[string]string
ServiceID string
ServiceName string
ServiceTags []string
ServiceAddress string
ServicePort int
ServiceEnableTagOverride bool
RaftIndex
}
// PartialClone() returns a clone of the given service node, minus the node-
// related fields that get filled in later, Address and TaggedAddresses.
func (s *ServiceNode) PartialClone() *ServiceNode {
tags := make([]string, len(s.ServiceTags))
copy(tags, s.ServiceTags)
return &ServiceNode{
// Skip ID, see above.
Node: s.Node,
// Skip Address, see above.
// Skip TaggedAddresses, see above.
ServiceID: s.ServiceID,
ServiceName: s.ServiceName,
ServiceTags: tags,
ServiceAddress: s.ServiceAddress,
ServicePort: s.ServicePort,
ServiceEnableTagOverride: s.ServiceEnableTagOverride,
RaftIndex: RaftIndex{
CreateIndex: s.CreateIndex,
ModifyIndex: s.ModifyIndex,
},
}
}
// ToNodeService converts the given service node to a node service.
func (s *ServiceNode) ToNodeService() *NodeService {
return &NodeService{
ID: s.ServiceID,
Service: s.ServiceName,
Tags: s.ServiceTags,
Address: s.ServiceAddress,
Port: s.ServicePort,
EnableTagOverride: s.ServiceEnableTagOverride,
RaftIndex: RaftIndex{
CreateIndex: s.CreateIndex,
ModifyIndex: s.ModifyIndex,
},
}
}
type ServiceNodes []*ServiceNode
// NodeService is a service provided by a node
type NodeService struct {
ID string
Service string
Tags []string
Address string
Port int
EnableTagOverride bool
RaftIndex
}
// IsSame checks if one NodeService is the same as another, without looking
// at the Raft information (that's why we didn't call it IsEqual). This is
// useful for seeing if an update would be idempotent for all the functional
// parts of the structure.
func (s *NodeService) IsSame(other *NodeService) bool {
if s.ID != other.ID ||
s.Service != other.Service ||
!reflect.DeepEqual(s.Tags, other.Tags) ||
s.Address != other.Address ||
s.Port != other.Port ||
s.EnableTagOverride != other.EnableTagOverride {
return false
}
return true
}
// ToServiceNode converts the given node service to a service node.
func (s *NodeService) ToServiceNode(node string) *ServiceNode {
return &ServiceNode{
// Skip ID, see ServiceNode definition.
Node: node,
// Skip Address, see ServiceNode definition.
// Skip TaggedAddresses, see ServiceNode definition.
ServiceID: s.ID,
ServiceName: s.Service,
ServiceTags: s.Tags,
ServiceAddress: s.Address,
ServicePort: s.Port,
ServiceEnableTagOverride: s.EnableTagOverride,
RaftIndex: RaftIndex{
CreateIndex: s.CreateIndex,
ModifyIndex: s.ModifyIndex,
},
}
}
type NodeServices struct {
Node *Node
Services map[string]*NodeService
}
// HealthCheck represents a single check on a given node
type HealthCheck struct {
Node string
CheckID types.CheckID // Unique per-node ID
Name string // Check name
Status string // The current check status
Notes string // Additional notes with the status
Output string // Holds output of script runs
ServiceID string // optional associated service
ServiceName string // optional service name
ServiceTags []string // optional service tags
RaftIndex
}
// IsSame checks if one HealthCheck is the same as another, without looking
// at the Raft information (that's why we didn't call it IsEqual). This is
// useful for seeing if an update would be idempotent for all the functional
// parts of the structure.
func (c *HealthCheck) IsSame(other *HealthCheck) bool {
if c.Node != other.Node ||
c.CheckID != other.CheckID ||
c.Name != other.Name ||
c.Status != other.Status ||
c.Notes != other.Notes ||
c.Output != other.Output ||
c.ServiceID != other.ServiceID ||
c.ServiceName != other.ServiceName ||
!reflect.DeepEqual(c.ServiceTags, other.ServiceTags) {
return false
}
return true
}
// Clone returns a distinct clone of the HealthCheck.
func (c *HealthCheck) Clone() *HealthCheck {
clone := new(HealthCheck)
*clone = *c
return clone
}
// HealthChecks is a collection of HealthCheck structs.
type HealthChecks []*HealthCheck
// CheckServiceNode is used to provide the node, its service
// definition, as well as a HealthCheck that is associated.
type CheckServiceNode struct {
Node *Node
Service *NodeService
Checks HealthChecks
}
type CheckServiceNodes []CheckServiceNode
// Shuffle does an in-place random shuffle using the Fisher-Yates algorithm.
func (nodes CheckServiceNodes) Shuffle() {
for i := len(nodes) - 1; i > 0; i-- {
j := rand.Int31n(int32(i + 1))
nodes[i], nodes[j] = nodes[j], nodes[i]
}
}
// Filter removes nodes that are failing health checks (and any non-passing
// check if that option is selected). Note that this returns the filtered
// results AND modifies the receiver for performance.
func (nodes CheckServiceNodes) Filter(onlyPassing bool) CheckServiceNodes {
n := len(nodes)
OUTER:
for i := 0; i < n; i++ {
node := nodes[i]
for _, check := range node.Checks {
if check.Status == api.HealthCritical ||
(onlyPassing && check.Status != api.HealthPassing) {
nodes[i], nodes[n-1] = nodes[n-1], CheckServiceNode{}
n--
i--
continue OUTER
}
}
}
return nodes[:n]
}
// NodeInfo is used to dump all associated information about
// a node. This is currently used for the UI only, as it is
// rather expensive to generate.
type NodeInfo struct {
ID types.NodeID
Node string
Address string
TaggedAddresses map[string]string
Meta map[string]string
Services []*NodeService
Checks HealthChecks
}
// NodeDump is used to dump all the nodes with all their
// associated data. This is currently used for the UI only,
// as it is rather expensive to generate.
type NodeDump []*NodeInfo
type IndexedNodes struct {
Nodes Nodes
QueryMeta
}
type IndexedServices struct {
Services Services
QueryMeta
}
type IndexedServiceNodes struct {
ServiceNodes ServiceNodes
QueryMeta
}
type IndexedNodeServices struct {
NodeServices *NodeServices
QueryMeta
}
type IndexedHealthChecks struct {
HealthChecks HealthChecks
QueryMeta
}
type IndexedCheckServiceNodes struct {
Nodes CheckServiceNodes
QueryMeta
}
type IndexedNodeDump struct {
Dump NodeDump
QueryMeta
}
// DirEntry is used to represent a directory entry. This is
// used for values in our Key-Value store.
type DirEntry struct {
LockIndex uint64
Key string
Flags uint64
Value []byte
Session string `json:",omitempty"`
RaftIndex
}
// Returns a clone of the given directory entry.
func (d *DirEntry) Clone() *DirEntry {
return &DirEntry{
LockIndex: d.LockIndex,
Key: d.Key,
Flags: d.Flags,
Value: d.Value,
Session: d.Session,
RaftIndex: RaftIndex{
CreateIndex: d.CreateIndex,
ModifyIndex: d.ModifyIndex,
},
}
}
type DirEntries []*DirEntry
// KVSRequest is used to operate on the Key-Value store
type KVSRequest struct {
Datacenter string
Op api.KVOp // Which operation are we performing
DirEnt DirEntry // Which directory entry
WriteRequest
}
func (r *KVSRequest) RequestDatacenter() string {
return r.Datacenter
}
// KeyRequest is used to request a key, or key prefix
type KeyRequest struct {
Datacenter string
Key string
QueryOptions
}
func (r *KeyRequest) RequestDatacenter() string {
return r.Datacenter
}
// KeyListRequest is used to list keys
type KeyListRequest struct {
Datacenter string
Prefix string
Seperator string
QueryOptions
}
func (r *KeyListRequest) RequestDatacenter() string {
return r.Datacenter
}
type IndexedDirEntries struct {
Entries DirEntries
QueryMeta
}
type IndexedKeyList struct {
Keys []string
QueryMeta
}
type SessionBehavior string
const (
SessionKeysRelease SessionBehavior = "release"
SessionKeysDelete = "delete"
)
const (
SessionTTLMax = 24 * time.Hour
SessionTTLMultiplier = 2
)
// Session is used to represent an open session in the KV store.
// This issued to associate node checks with acquired locks.
type Session struct {
ID string
Name string
Node string
Checks []types.CheckID
LockDelay time.Duration
Behavior SessionBehavior // What to do when session is invalidated
TTL string
RaftIndex
}
type Sessions []*Session
type SessionOp string
const (
SessionCreate SessionOp = "create"
SessionDestroy = "destroy"
)
// SessionRequest is used to operate on sessions
type SessionRequest struct {
Datacenter string
Op SessionOp // Which operation are we performing
Session Session // Which session
WriteRequest
}
func (r *SessionRequest) RequestDatacenter() string {
return r.Datacenter
}
// SessionSpecificRequest is used to request a session by ID
type SessionSpecificRequest struct {
Datacenter string
Session string
QueryOptions
}
func (r *SessionSpecificRequest) RequestDatacenter() string {
return r.Datacenter
}
type IndexedSessions struct {
Sessions Sessions
QueryMeta
}
// Coordinate stores a node name with its associated network coordinate.
type Coordinate struct {
Node string
Coord *coordinate.Coordinate
}
type Coordinates []*Coordinate
// IndexedCoordinate is used to represent a single node's coordinate from the state
// store.
type IndexedCoordinate struct {
Coord *coordinate.Coordinate
QueryMeta
}
// IndexedCoordinates is used to represent a list of nodes and their
// corresponding raw coordinates.
type IndexedCoordinates struct {
Coordinates Coordinates
QueryMeta
}
// DatacenterMap is used to represent a list of nodes with their raw coordinates,
// associated with a datacenter. Coordinates are only compatible between nodes in
// the same area.
type DatacenterMap struct {
Datacenter string
AreaID types.AreaID
Coordinates Coordinates
}
// CoordinateUpdateRequest is used to update the network coordinate of a given
// node.
type CoordinateUpdateRequest struct {
Datacenter string
Node string
Coord *coordinate.Coordinate
WriteRequest
}
// RequestDatacenter returns the datacenter for a given update request.
func (c *CoordinateUpdateRequest) RequestDatacenter() string {
return c.Datacenter
}
// EventFireRequest is used to ask a server to fire
// a Serf event. It is a bit odd, since it doesn't depend on
// the catalog or leader. Any node can respond, so it's not quite
// like a standard write request. This is used only internally.
type EventFireRequest struct {
Datacenter string
Name string
Payload []byte
// Not using WriteRequest so that any server can process
// the request. It is a bit unusual...
QueryOptions
}
func (r *EventFireRequest) RequestDatacenter() string {
return r.Datacenter
}
// EventFireResponse is used to respond to a fire request.
type EventFireResponse struct {
QueryMeta
}
type TombstoneOp string
const (
TombstoneReap TombstoneOp = "reap"
)
// TombstoneRequest is used to trigger a reaping of the tombstones
type TombstoneRequest struct {
Datacenter string
Op TombstoneOp
ReapIndex uint64
WriteRequest
}
func (r *TombstoneRequest) RequestDatacenter() string {
return r.Datacenter
}
// msgpackHandle is a shared handle for encoding/decoding of structs
var msgpackHandle = &codec.MsgpackHandle{}
// Decode is used to decode a MsgPack encoded object
func Decode(buf []byte, out interface{}) error {
return codec.NewDecoder(bytes.NewReader(buf), msgpackHandle).Decode(out)
}
// Encode is used to encode a MsgPack object with type prefix
func Encode(t MessageType, msg interface{}) ([]byte, error) {
var buf bytes.Buffer
buf.WriteByte(uint8(t))
err := codec.NewEncoder(&buf, msgpackHandle).Encode(msg)
return buf.Bytes(), err
}
// CompoundResponse is an interface for gathering multiple responses. It is
// used in cross-datacenter RPC calls where more than 1 datacenter is
// expected to reply.
type CompoundResponse interface {
// Add adds a new response to the compound response
Add(interface{})
// New returns an empty response object which can be passed around by
// reference, and then passed to Add() later on.
New() interface{}
}
type KeyringOp string
const (
KeyringList KeyringOp = "list"
KeyringInstall = "install"
KeyringUse = "use"
KeyringRemove = "remove"
)
// KeyringRequest encapsulates a request to modify an encryption keyring.
// It can be used for install, remove, or use key type operations.
type KeyringRequest struct {
Operation KeyringOp
Key string
Datacenter string
Forwarded bool
RelayFactor uint8
QueryOptions
}
func (r *KeyringRequest) RequestDatacenter() string {
return r.Datacenter
}
// KeyringResponse is a unified key response and can be used for install,
// remove, use, as well as listing key queries.
type KeyringResponse struct {
WAN bool
Datacenter string
Messages map[string]string `json:",omitempty"`
Keys map[string]int
NumNodes int
Error string `json:",omitempty"`
}
// KeyringResponses holds multiple responses to keyring queries. Each
// datacenter replies independently, and KeyringResponses is used as a
// container for the set of all responses.
type KeyringResponses struct {
Responses []*KeyringResponse
QueryMeta
}
func (r *KeyringResponses) Add(v interface{}) {
val := v.(*KeyringResponses)
r.Responses = append(r.Responses, val.Responses...)
}
func (r *KeyringResponses) New() interface{} {
return new(KeyringResponses)
}