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log.go
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log.go
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package log
import (
"fmt"
"github.com/davecgh/go-spew/spew"
"github.com/sirupsen/logrus"
"log"
"viewStampedReplication/logger"
"viewStampedReplication/server/serviceconfig"
"viewStampedReplication/store"
)
var opLogger *logrus.Logger
type OpResult struct {
Val *string
Err *string
Committed bool
}
func (or *OpResult) String() string {
var str string
if or.Val != nil {
str = fmt.Sprintf("Value(%s)", *or.Val)
} else if or.Err != nil {
str = fmt.Sprintf("Error(%s)", *or.Err)
} else {
str = "<nil>"
}
return str
}
type Message struct {
Action string
Key string
Val *string
}
func (msg Message) String() string {
if msg.Val == nil {
return fmt.Sprintf("%s %s", msg.Action, msg.Key)
}
return fmt.Sprintf("%s %s (%s)", msg.Action, msg.Key, *(msg.Val))
}
type LogMessage struct {
ClientId string
RequestId int
Log Message
}
func (log LogMessage) String() string {
return fmt.Sprintf("%s %d %s", log.ClientId, log.RequestId, log.Log)
}
type Operation struct {
OpId int
Log LogMessage
Result *OpResult
Quorum map[int]bool
Committed bool
}
func (op *Operation) Commit() *OpResult {
msg := op.Log.Log
log.Printf("Operation: %+v", spew.NewFormatter(op))
opLogger.Infof("%+v", spew.NewFormatter(op))
var err error
var val string
switch msg.Action {
case "CREATE":
err = store.Get().Create(msg.Key, *msg.Val)
case "DELETE":
err = store.Get().Delete(msg.Key)
case "READ":
val, err = store.Get().Read(msg.Key)
case "UPDATE":
err = store.Get().Update(msg.Key, *msg.Val)
}
if val == "" && err == nil {
op.Result = &OpResult{
Val: msg.Val,
Err: nil,
}
} else if err == nil {
op.Result = &OpResult{
Val: &val,
Err: nil,
}
} else {
var errStr = err.Error()
op.Result = &OpResult{
Val: nil,
Err: &errStr,
}
}
op.Committed = true
op.Result.Committed = true
log.Printf("Got commit result; val: %v, err: %v, committed: %v", val, err, op.Result.Committed)
return op.Result
}
func (op *Operation) IsQuorumSatisfied() bool {
count := len(op.Quorum)
log.Printf("Operation quorum: %d; opId: %d", count, op.OpId)
if count == serviceconfig.GetConfig().QuorumSize - 1 {
log.Printf("Quorum satisfied; recvd: %d", count)
return true
}
return false
}
func (op Operation) String() string {
return fmt.Sprintf("%d %s", op.OpId, op.Log)
}
func Init(id string) {
opLogger = logger.NewLogger(fmt.Sprintf("op-%s.log", id))
opLogger.Info("OpId ClientId RequestId Action Key (Val)")
}