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package proofserver
import (
"context"
"fmt"
"io/ioutil"
"net/http"
"sync"
"time"
"github.com/gin-contrib/cors"
"github.com/gin-gonic/gin"
"github.com/hermeznetwork/hermez-node/log"
"github.com/hermeznetwork/hermez-node/prover"
"github.com/hermeznetwork/tracerr"
)
type msg struct {
value string
ackCh chan bool
}
func newMsg(value string) msg {
return msg{
value: value,
ackCh: make(chan bool),
}
}
// Mock proof server
type Mock struct {
addr string
status prover.StatusCode
sync.RWMutex
proof string
pubData string
counter int
msgCh chan msg
wg sync.WaitGroup
provingDuration time.Duration
}
// NewMock creates a new mock server
func NewMock(addr string, provingDuration time.Duration) *Mock {
return &Mock{
addr: addr,
status: prover.StatusCodeReady,
proof: "",
pubData: "",
counter: 0,
msgCh: make(chan msg),
provingDuration: provingDuration,
}
}
func (s *Mock) err(c *gin.Context, err error) {
c.JSON(http.StatusInternalServerError, prover.ErrorServer{
Status: "error",
Message: err.Error(),
})
}
func (s *Mock) handleCancel(c *gin.Context) {
msg := newMsg("cancel")
s.msgCh <- msg
<-msg.ackCh
c.JSON(http.StatusOK, "OK")
}
/* Status example from the real server proof:
Status:
{
"proof": "{\n \"pi_a\": [\n \"1368015179489954701390400359078579693043519447331113978918064868415326638035\",\n \"9918110051302171585080402603319702774565515993150576347155970296011118125764\",\n \"1\"\n ],\n \"pi_b\": [\n [\n \"10857046999023057135944570762232829481370756359578518086990519993285655852781\",\n \"11559732032986387107991004021392285783925812861821192530917403151452391805634\"\n ],\n [\n \"8495653923123431417604973247489272438418190587263600148770280649306958101930\",\n \"4082367875863433681332203403145435568316851327593401208105741076214120093531\"\n ],\n [\n \"1\",\n \"0\"\n ]\n ],\n \"pi_c\": [\n \"1368015179489954701390400359078579693043519447331113978918064868415326638035\",\n \"9918110051302171585080402603319702774565515993150576347155970296011118125764\",\n \"1\"\n ],\n \"protocol\": \"groth\"\n}\n",
"pubData": "[\n \"8863150934551775031093873719629424744398133643983814385850330952980893030086\"\n]\n",
"status": "success"
}
proof:
{
"pi_a": [
"1368015179489954701390400359078579693043519447331113978918064868415326638035",
"9918110051302171585080402603319702774565515993150576347155970296011118125764",
"1"
],
"pi_b": [
[
"10857046999023057135944570762232829481370756359578518086990519993285655852781",
"11559732032986387107991004021392285783925812861821192530917403151452391805634"
],
[
"8495653923123431417604973247489272438418190587263600148770280649306958101930",
"4082367875863433681332203403145435568316851327593401208105741076214120093531"
],
[
"1",
"0"
]
],
"pi_c": [
"1368015179489954701390400359078579693043519447331113978918064868415326638035",
"9918110051302171585080402603319702774565515993150576347155970296011118125764",
"1"
],
"protocol": "groth"
}
pubData:
[
"8863150934551775031093873719629424744398133643983814385850330952980893030086"
]
*/
func (s *Mock) handleStatus(c *gin.Context) {
s.RLock()
c.JSON(http.StatusOK, prover.Status{
Status: s.status,
Proof: s.proof,
PubData: s.pubData,
})
s.RUnlock()
}
func (s *Mock) handleInput(c *gin.Context) {
s.RLock()
if !s.status.IsReady() {
s.err(c, fmt.Errorf("not ready"))
s.RUnlock()
return
}
s.RUnlock()
_, err := ioutil.ReadAll(c.Request.Body)
if err != nil {
s.err(c, err)
return
}
msg := newMsg("prove")
s.msgCh <- msg
<-msg.ackCh
c.JSON(http.StatusOK, "OK")
}
const longWaitDuration = 999 * time.Hour
// const provingDuration = 2 * time.Second
func (s *Mock) runProver(ctx context.Context) {
waitDuration := longWaitDuration
for {
select {
case <-ctx.Done():
return
case msg := <-s.msgCh:
switch msg.value {
case "cancel":
waitDuration = longWaitDuration
s.Lock()
if !s.status.IsReady() {
s.status = prover.StatusCodeAborted
}
s.Unlock()
case "prove":
waitDuration = s.provingDuration
s.Lock()
s.status = prover.StatusCodeBusy
s.Unlock()
}
msg.ackCh <- true
case <-time.After(waitDuration):
waitDuration = longWaitDuration
s.Lock()
if s.status != prover.StatusCodeBusy {
s.Unlock()
continue
}
i := s.counter * 100 //nolint:gomnd
s.counter++
// Mock data
s.proof = fmt.Sprintf(`{
"pi_a": ["%v", "%v", "1"],
"pi_b": [["%v", "%v"],["%v", "%v"],["1", "0"]],
"pi_c": ["%v", "%v", "1"],
"protocol": "groth16"
}`, i, i+1, i+2, i+3, i+4, i+5, i+6, i+7) //nolint:gomnd
s.pubData = fmt.Sprintf(`[
"%v"
]`, i+42) //nolint:gomnd
s.status = prover.StatusCodeSuccess
s.Unlock()
}
}
}
// Run the mock server. Use ctx to stop it via cancel
func (s *Mock) Run(ctx context.Context) error {
api := gin.Default()
api.Use(cors.Default())
apiGroup := api.Group("/api")
apiGroup.GET("/status", s.handleStatus)
apiGroup.POST("/input", s.handleInput)
apiGroup.POST("/cancel", s.handleCancel)
debugAPIServer := &http.Server{
Addr: s.addr,
Handler: api,
// Use some hardcoded numberes that are suitable for testing
ReadTimeout: 30 * time.Second, //nolint:gomnd
WriteTimeout: 30 * time.Second, //nolint:gomnd
MaxHeaderBytes: 1 << 20, //nolint:gomnd
}
go func() {
log.Infof("prover.MockServer is ready at %v", s.addr)
if err := debugAPIServer.ListenAndServe(); err != nil && tracerr.Unwrap(err) != http.ErrServerClosed {
log.Fatalf("Listen: %s\n", err)
}
}()
s.wg.Add(1)
go func() {
s.runProver(ctx)
s.wg.Done()
}()
<-ctx.Done()
log.Info("Stopping prover.MockServer...")
s.wg.Wait()
ctxTimeout, cancel := context.WithTimeout(context.Background(), 10*time.Second) //nolint:gomnd
defer cancel()
if err := debugAPIServer.Shutdown(ctxTimeout); err != nil {
return tracerr.Wrap(err)
}
log.Info("prover.MockServer done")
return nil
}