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process.go
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process.go
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package kcl
import (
"fmt"
"errors"
"runtime"
)
type MalformedAction struct {
Action string
Key string
}
func (e *MalformedAction) Error() string {
var err string
if e.Key == "" {
err = fmt.Sprintf("Received an action which couldn't be understood. Action was %s", e.Action)
} else {
err = fmt.Sprintf("Action %s was expected to have key %s", e.Action, e.Key)
}
return err
}
type Process struct {
Rp RecordProcessor
Ih *IOHandler
Cp *CheckPointer
}
func (p *Process) Run() error {
for {
l := p.Ih.ReadLine()
if len(l) > 0 {
err := p.handleLine(l)
if err != nil {
return err
}
} else {
return errors.New("No Input Error")
}
}
}
func (p *Process) handleLine(l []byte) error {
a := p.Ih.LoadAction(l)
err := p.performAction(&a)
if err != nil {
return err
}
p.reportDone(a.Type)
return nil
}
func (p *Process) performAction(a *Action) error {
var err error
switch a.Type {
case "":
err = &MalformedAction{"unknown", "action"}
case "initialize":
if a.ShardId == "" {
err = &MalformedAction{a.Type, "shardId"}
} else {
err = p.Rp.Init(a.ShardId)
}
case "processRecords":
if len(a.Records) == 0 {
err = &MalformedAction{a.Type, "records"}
} else {
err = p.Rp.ProcessRecords(a.Records, p.Cp)
}
case "shutdown":
if a.Reason == "" {
err = &MalformedAction{a.Type, "reason"}
} else {
err = p.Rp.Shutdown(p.Cp, a.Reason)
}
default:
err = &MalformedAction{a.Type, ""}
}
if err != nil {
var buf []byte
runtime.Stack(buf, true)
p.Ih.WriteError(buf)
return err
}
return nil
}
func (p *Process) reportDone(r string) {
res := Response{"status", r}
p.Ih.WriteAction(res)
}
func NewProcess(rp RecordProcessor) Process {
ih := NewIOHandler()
p := Process{rp, &ih, &CheckPointer{&ih}}
return p
}