forked from hashicorp/consul
/
structs.go
353 lines (294 loc) · 7.7 KB
/
structs.go
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package structs
import (
"bytes"
"fmt"
"github.com/ugorji/go/codec"
"time"
)
var (
ErrNoLeader = fmt.Errorf("No cluster leader")
ErrNoDCPath = fmt.Errorf("No path to datacenter")
ErrNoServers = fmt.Errorf("No known Consul servers")
)
type MessageType uint8
const (
RegisterRequestType MessageType = iota
DeregisterRequestType
KVSRequestType
)
const (
HealthUnknown = "unknown"
HealthPassing = "passing"
HealthWarning = "warning"
HealthCritical = "critical"
)
// RPCInfo is used to describe common information about query
type RPCInfo interface {
RequestDatacenter() string
IsRead() bool
AllowStaleRead() bool
}
// QueryOptions is used to specify various flags for read queries
type QueryOptions struct {
// 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
}
// QueryOption only applies to reads, so always true
func (q QueryOptions) IsRead() bool {
return true
}
func (q QueryOptions) AllowStaleRead() bool {
return q.AllowStale
}
type WriteRequest struct{}
// WriteRequest only applies to writes, always false
func (w WriteRequest) IsRead() bool {
return false
}
func (w WriteRequest) AllowStaleRead() bool {
return false
}
// 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
Node string
Address string
Service *NodeService
Check *HealthCheck
WriteRequest
}
func (r *RegisterRequest) RequestDatacenter() string {
return r.Datacenter
}
// 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 string
WriteRequest
}
func (r *DeregisterRequest) RequestDatacenter() string {
return r.Datacenter
}
// DCSpecificRequest is used to query about a specific DC
type DCSpecificRequest struct {
Datacenter string
QueryOptions
}
func (r *DCSpecificRequest) RequestDatacenter() string {
return r.Datacenter
}
// ServiceSpecificRequest is used to query about a specific node
type ServiceSpecificRequest struct {
Datacenter string
ServiceName string
ServiceTag string
TagFilter bool // Controls tag filtering
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
State string
QueryOptions
}
func (r *ChecksInStateRequest) RequestDatacenter() string {
return r.Datacenter
}
// Used to return information about a node
type Node struct {
Node string
Address string
}
type Nodes []Node
// 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
type ServiceNode struct {
Node string
Address string
ServiceID string
ServiceName string
ServiceTags []string
ServicePort int
}
type ServiceNodes []ServiceNode
// NodeService is a service provided by a node
type NodeService struct {
ID string
Service string
Tags []string
Port int
}
type NodeServices struct {
Node Node
Services map[string]*NodeService
}
// HealthCheck represents a single check on a given node
type HealthCheck struct {
Node string
CheckID string // 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
}
type HealthChecks []*HealthCheck
// CheckServiceNode is used to provide the node, it's service
// definition, as well as a HealthCheck that is associated
type CheckServiceNode struct {
Node Node
Service NodeService
Checks HealthChecks
}
type CheckServiceNodes []CheckServiceNode
// 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 {
Node string
Address string
Services []*NodeService
Checks []*HealthCheck
}
// 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 {
CreateIndex uint64
ModifyIndex uint64
Key string
Flags uint64
Value []byte
}
type DirEntries []*DirEntry
type KVSOp string
const (
KVSSet KVSOp = "set"
KVSDelete = "delete"
KVSDeleteTree = "delete-tree"
KVSCAS = "cas" // Check-and-set
)
// KVSRequest is used to operate on the Key-Value store
type KVSRequest struct {
Datacenter string
Op KVSOp // 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
}
// Decode is used to decode a MsgPack encoded object
func Decode(buf []byte, out interface{}) error {
var handle codec.MsgpackHandle
return codec.NewDecoder(bytes.NewReader(buf), &handle).Decode(out)
}
// Encode is used to encode a MsgPack object with type prefix
func Encode(t MessageType, msg interface{}) ([]byte, error) {
buf := bytes.NewBuffer(nil)
buf.WriteByte(uint8(t))
handle := codec.MsgpackHandle{}
encoder := codec.NewEncoder(buf, &handle)
err := encoder.Encode(msg)
return buf.Bytes(), err
}