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kvs_endpoint.go
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/
kvs_endpoint.go
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package consul
import (
"fmt"
"github.com/armon/go-metrics"
"github.com/hashicorp/consul/consul/structs"
"time"
)
// KVS endpoint is used to manipulate the Key-Value store
type KVS struct {
srv *Server
}
// Apply is used to apply a KVS request to the data store. This should
// only be used for operations that modify the data
func (k *KVS) Apply(args *structs.KVSRequest, reply *bool) error {
if done, err := k.srv.forward("KVS.Apply", args.Datacenter, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"consul", "kvs", "apply"}, time.Now())
// Verify the args
if args.DirEnt.Key == "" && args.Op != structs.KVSDeleteTree {
return fmt.Errorf("Must provide key")
}
// Apply the update
resp, err := k.srv.raftApply(structs.KVSRequestType, args)
if err != nil {
k.srv.logger.Printf("[ERR] consul.kvs: Apply failed: %v", err)
return err
}
if respErr, ok := resp.(error); ok {
return respErr
}
// Check if the return type is a bool
if respBool, ok := resp.(bool); ok {
*reply = respBool
}
return nil
}
// Get is used to lookup a single key
func (k *KVS) Get(args *structs.KeyRequest, reply *structs.IndexedDirEntries) error {
if done, err := k.srv.forward("KVS.Get", args.Datacenter, args, reply); done {
return err
}
// Get the local state
state := k.srv.fsm.State()
return k.srv.blockingRPC(&args.BlockingQuery,
state.QueryTables("KVSGet"),
func() (uint64, error) {
index, ent, err := state.KVSGet(args.Key)
if err != nil {
return 0, err
}
if ent == nil {
// Must provide non-zero index to prevent blocking
// Index 1 is impossible anyways (due to Raft internals)
if index == 0 {
reply.Index = 1
} else {
reply.Index = index
}
reply.Entries = nil
} else {
reply.Index = ent.ModifyIndex
reply.Entries = structs.DirEntries{ent}
}
return reply.Index, nil
})
}
// List is used to list all keys with a given prefix
func (k *KVS) List(args *structs.KeyRequest, reply *structs.IndexedDirEntries) error {
if done, err := k.srv.forward("KVS.List", args.Datacenter, args, reply); done {
return err
}
// Get the local state
state := k.srv.fsm.State()
return k.srv.blockingRPC(&args.BlockingQuery,
state.QueryTables("KVSList"),
func() (uint64, error) {
index, ent, err := state.KVSList(args.Key)
if err != nil {
return 0, err
}
if len(ent) == 0 {
// Must provide non-zero index to prevent blocking
// Index 1 is impossible anyways (due to Raft internals)
if index == 0 {
reply.Index = 1
} else {
reply.Index = index
}
reply.Entries = nil
} else {
// Determine the maximum affected index
var maxIndex uint64
for _, e := range ent {
if e.ModifyIndex > maxIndex {
maxIndex = e.ModifyIndex
}
}
reply.Index = maxIndex
reply.Entries = ent
}
return reply.Index, nil
})
}