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webhook.go
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webhook.go
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package shared
import (
"context"
"encoding/json"
"errors"
"log"
"net"
"reflect"
"strconv"
"syscall"
"time"
"unsafe"
"github.com/adjust/rmq/v4"
"github.com/avast/retry-go/v3"
"github.com/go-playground/validator/v10"
_ "github.com/go-sql-driver/mysql"
"github.com/segmentio/ksuid"
"github.com/si3nloong/webhook/app/entity"
"github.com/si3nloong/webhook/app/mq/nats"
"github.com/si3nloong/webhook/app/mq/redis"
"github.com/si3nloong/webhook/cmd"
pb "github.com/si3nloong/webhook/protobuf"
"github.com/valyala/fasthttp"
)
/*
Flow --------->
send webhook ---> insert into Queue
get from queue ---> fire webhook
fire webhook ---> record stat (add success count or log error)
*/
type webhookServer struct {
Repository
v *validator.Validate
mq MessageQueue
}
func NewServer(cfg *cmd.Config) WebhookServer {
var (
err error
svr = &webhookServer{
v: validator.New(),
}
)
// setup Database
switch cfg.DB.Engine {
case cmd.DatabaseEngineElasticsearch:
// svr.Repository, err = es.New(cfg)
default:
// panic(fmt.Sprintf("invalid database engine %s", cfg.DB.Engine))
}
if err != nil {
panic(err)
}
log.Println("Database engine =>", cfg.DB.Engine)
log.Println("Message queue engine =>", cfg.MessageQueue.Engine)
// setup Message Queueing
switch cfg.MessageQueue.Engine {
case cmd.MessageQueueEngineRedis:
{
svr.mq, err = redis.New(cfg, func(msg rmq.Delivery) {
var (
data = entity.WebhookRequest{}
errs error
)
// capture error if exists when it's end
defer func() {
if errs != nil {
svr.logErrorIfAny(errs)
svr.logErrorIfAny(msg.Reject())
return
}
svr.logErrorIfAny(msg.Ack())
}()
if errs = json.Unmarshal([]byte(msg.Payload()), &data); errs != nil {
return
}
if errs = svr.fireWebhook(&data); errs != nil {
return
}
})
}
case cmd.MessageQueueEngineNSQ:
{
}
case cmd.MessageQueueEngineNats:
{
svr.mq, err = nats.New(cfg)
}
default:
// by default it will select in-memory pubsub
}
if err != nil {
panic(err)
}
return svr
}
func (s *webhookServer) Validate(src interface{}) error {
return s.v.Struct(src)
}
func (s *webhookServer) VarCtx(ctx context.Context, src interface{}, tag string) error {
return s.v.VarCtx(ctx, src, tag)
}
func (s *webhookServer) logErrorIfAny(err error) {
if err != nil {
s.LogError(err)
}
}
func (*webhookServer) LogError(err error) {
log.Println("Error", err)
}
func (s *webhookServer) Publish(ctx context.Context, req *pb.SendWebhookRequest) (*entity.WebhookRequest, error) {
utcNow := time.Now().UTC()
// Store the request to DB first before publishing it to message queue
data := entity.WebhookRequest{}
data.ID = ksuid.New()
data.Method = req.Method.String()
data.URL = req.Url
data.Headers = make(map[string]string)
for k, v := range req.Headers {
data.Headers[k] = v
}
data.Body = req.Body
data.Timeout = 3000 // 3 seconds
if req.Timeout > 0 {
data.Timeout = uint(req.Timeout)
}
data.Attempts = make([]entity.Attempt, 0)
data.CreatedAt = utcNow
data.UpdatedAt = utcNow
if err := s.CreateWebhook(ctx, &data); err != nil {
return nil, err
}
if err := s.mq.Publish(ctx, &data); err != nil {
return nil, err
}
return &data, nil
}
func (s *webhookServer) fireWebhook(data *entity.WebhookRequest) error {
ctx := context.TODO()
startTime := time.Now().UTC()
opts := make([]retry.Option, 0)
log.Println("SendWebhook now....!!!")
opts = append(opts, retry.Attempts(10))
// if req.RetryMechanism > 0 {
opts = append(opts, retry.DelayType(func(n uint, err error, config *retry.Config) time.Duration {
log.Println("backoff retrying")
log.Println(n, err, config)
// fmt.Println("Server fails with: " + err.Error())
// if retriable, ok := err.(*retry.RetriableError); ok {
// fmt.Printf("Client follows server recommendation to retry after %v\n", retriable.RetryAfter)
// return retriable.RetryAfter
// }
// apply a default exponential back off strategy
return retry.BackOffDelay(n, err, config)
}))
// }
errs := retry.Do(
func() error {
httpReq := fasthttp.AcquireRequest()
httpResp := fasthttp.AcquireResponse()
defer fasthttp.ReleaseRequest(httpReq)
defer fasthttp.ReleaseResponse(httpResp)
httpReq.Header.SetRequestURI(data.URL)
httpReq.Header.SetMethod(data.Method)
for k, v := range data.Headers {
httpReq.Header.Add(k, v)
}
httpReq.AppendBodyString(data.Body)
// By default timeout is 3 seconds
timeout := 3 * time.Second
// if data.Timeout > 0 {
// timeout = time.Second * time.Duration(req.Timeout)
// }
log.Println("Request =======>")
log.Println(httpReq.String())
var dnsError *net.DNSError
if err := fasthttp.DoTimeout(httpReq, httpResp, timeout); errors.As(err, &dnsError) {
// If it's an invalid host, drop the request directly
log.Println("Error 1 =======>", err)
return retry.Unrecoverable(err)
} else if err != nil {
switch t := err.(type) {
case *net.OpError:
// if it's an unknown host, drop it
if t.Op == "dial" {
println("Unknown host")
} else if t.Op == "read" {
println("Connection refused")
}
case syscall.Errno:
if t == syscall.ECONNREFUSED {
println("Connection refused")
}
}
log.Println("Error 2 =======>", err, reflect.TypeOf(err))
return err
}
log.Println("Response =======>")
log.Println(httpResp.String())
statusCode := httpResp.StatusCode()
var body string
i64, _ := strconv.ParseInt(string(httpResp.Header.Peek("Content-Length")), 10, 64)
// discard the response if body bigger than 1mb
if i64 < 1048 {
body = string(httpResp.Body())
}
utcNow := time.Now().UTC()
att := entity.Attempt{}
att.Headers = make(map[string]string)
httpResp.Header.VisitAll(func(key, value []byte) {
att.Headers[b2s(key)] = b2s(value)
})
att.Body = body
att.ElapsedTime = time.Now().UTC().Sub(startTime).Milliseconds()
att.StatusCode = uint(statusCode)
att.CreatedAt = utcNow
if err := s.UpdateWebhook(ctx, data.ID.String(), &att); err != nil {
return err
}
// 100 - 199
if statusCode < fasthttp.StatusOK {
log.Println("100 - 199")
// 500
} else if statusCode >= fasthttp.StatusInternalServerError {
log.Println("500")
// return &requestError{body: httpResp.String()}
// 400
return errors.New("error 500")
} else if statusCode >= fasthttp.StatusBadRequest {
log.Println("400")
// retry
return errors.New("error 404")
}
return nil
},
opts...,
)
return errs
}
type requestError struct {
body string
}
func (e requestError) Error() string {
return ""
}
func b2s(b []byte) string {
return *(*string)(unsafe.Pointer(&b))
}