/
fastrest.go
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/
fastrest.go
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package fastrest
import (
"embed"
"encoding/json"
"fmt"
"github.com/bingoohuang/fastrest/fgrpc/service"
"log"
"net"
"net/http"
"os"
"path/filepath"
"reflect"
"runtime"
"strings"
"unsafe"
"github.com/bingoohuang/easyjson"
"github.com/bingoohuang/easyjson/bytebufferpool"
"github.com/bingoohuang/easyjson/jwriter"
"github.com/bingoohuang/fastrest/fgrpc/server"
"github.com/bingoohuang/gg/pkg/flagparse"
"github.com/bingoohuang/gg/pkg/iox"
"github.com/bingoohuang/gg/pkg/sigx"
"github.com/bingoohuang/gg/pkg/ss"
"github.com/soheilhy/cmux"
"github.com/valyala/fasthttp"
"github.com/valyala/fasthttp/reuseport"
"google.golang.org/grpc"
"google.golang.org/grpc/reflection"
)
type Context struct {
Req interface{}
Rsp interface{}
Ctx *fasthttp.RequestCtx
ServiceName string
Returners []bytebufferpool.PoolReturner
}
func (c *Context) Release() {
for _, returner := range c.Returners {
returner.ReturnPool()
}
}
var Pool = &bytebufferpool.Pool{}
func (c *Context) ApplyPoolBuf(size int) []byte {
buf := Pool.Get(bytebufferpool.WithMinSize(size))
c.AppendPoolReturner(bytebufferpool.PoolReturnFn(func() { Pool.Put(buf) }))
(*jwriter.Slice)(unsafe.Pointer(&buf.B)).Len = size // increase length manually
return buf.B
}
func (c *Context) AppendPoolReturner(r bytebufferpool.PoolReturner) {
if r != nil {
c.Returners = append(c.Returners, r)
}
}
type Service interface {
CreateReq() (interface{}, error)
Process(dtx *Context) (interface{}, error)
}
type PanicProcessor interface {
PanicProcess(dtx *Context, recovered interface{})
}
type PanicProcessorFn func(dtx *Context, recovered interface{})
func (f PanicProcessorFn) PanicProcess(dtx *Context, recovered interface{}) {
f(dtx, recovered)
}
type PreProcessor interface {
PreProcess(dtx *Context) error
}
type PreProcessorFn func(dtx *Context) error
func (f PreProcessorFn) PreProcess(dtx *Context) error {
return f(dtx)
}
type PostProcessor interface {
PostProcess(dtx *Context) error
}
type PostProcessorFn func(dtx *Context) error
func (f PostProcessorFn) PostProcess(dtx *Context) error {
return f(dtx)
}
type ErrorProcessor interface {
ProcessError(dtx *Context, err error) error
}
type ErrorProcessorFn func(dtx *Context, err error) error
func (f ErrorProcessorFn) ProcessError(dtx *Context, err error) error {
return f(dtx, err)
}
const (
ResultSendFile = "__ResultSendFile"
)
type DummyService struct{}
func (d *DummyService) CreateReq() (interface{}, error) { return nil, nil }
func (d DummyService) Process(*Context) (interface{}, error) { return nil, nil }
type Router struct {
routers map[string]Service
routerService map[string]string
Config *RouterConfig
}
type RouterConfig struct {
PanicProcessor PanicProcessor
AccessLogDir string
PreProcessors []PreProcessor
PostProcessors []PostProcessor
ErrorProcessors []ErrorProcessor
NotFoundHandler func(dtx *Context)
}
var (
DefaultPreProcessors []PreProcessor
DefaultPostProcessors []PostProcessor
DefaultErrorProcessors []ErrorProcessor
)
func RegisterPreProcessor(processors ...PreProcessor) {
DefaultPreProcessors = append(DefaultPreProcessors, processors...)
}
func RegisterPostProcessor(processors ...PostProcessor) {
DefaultPostProcessors = append(DefaultPostProcessors, processors...)
}
func RegisterErrorProcessors(processors ...ErrorProcessor) {
DefaultErrorProcessors = append(DefaultErrorProcessors, processors...)
}
type RouterConfigFn func(*RouterConfig)
func WithNotFoundHandler(v func(ctx *Context)) RouterConfigFn {
return func(r *RouterConfig) {
r.NotFoundHandler = v
}
}
func WithAccessLogDir(v string) RouterConfigFn {
return func(r *RouterConfig) {
r.AccessLogDir = v
}
}
func WithPanicProcessor(v PanicProcessor) RouterConfigFn {
return func(r *RouterConfig) {
r.PanicProcessor = v
}
}
func WithPreProcessor(v PreProcessor) RouterConfigFn {
return func(r *RouterConfig) {
r.PreProcessors = append(r.PreProcessors, v)
}
}
func WithPostProcessor(v PostProcessor) RouterConfigFn {
return func(r *RouterConfig) {
r.PostProcessors = append(r.PostProcessors, v)
}
}
func WithErrorProcessor(v ErrorProcessor) RouterConfigFn {
return func(r *RouterConfig) {
r.ErrorProcessors = append(r.ErrorProcessors, v)
}
}
func New(m map[string]Service, fns ...RouterConfigFn) *Router {
config := &RouterConfig{
PreProcessors: append([]PreProcessor{}, DefaultPreProcessors...),
PostProcessors: append([]PostProcessor{}, DefaultPostProcessors...),
ErrorProcessors: append([]ErrorProcessor{}, DefaultErrorProcessors...),
}
for _, fn := range fns {
fn(config)
}
return &Router{
Config: config,
routers: m,
routerService: makeRouterServices(m),
}
}
func IsEnvOff(name string) bool {
s := strings.ToLower(os.Getenv(name))
return s == "0" || s == "off" || s == "no"
}
func (r *Router) Serve(port string, reusePort bool) error {
log.Printf("Start to ListenAndServe %s", port)
listenFn := net.Listen
if reusePort {
listenFn = reuseport.Listen
}
ln, err := listenFn("tcp4", port)
if err != nil {
return err
}
return r.ServeListener(ln)
}
func (r *Router) ServeListener(ln net.Listener) error {
m := cmux.New(ln)
// Match connections in order:
// First grpc, then HTTP, and otherwise Go RPC/TCP.
// Java gRPC Clients: Java gRPC client blocks until it receives a SETTINGS frame from the server.
// If you are using the Java client to connect to a cmux'ed gRPC server please match with writers:
grpcL := m.MatchWithWriters(cmux.HTTP2MatchHeaderFieldSendSettings("content-type", "application/grpc"))
// All the rest is assumed to be HTTP
httpL := m.Match(cmux.Any())
grpcS := grpc.NewServer()
service.RegisterServiceServer(grpcS, &server.GrpcServer{})
if !IsEnvOff("GRPC_REFLECTION") {
reflection.Register(grpcS)
}
handle := r.handle
if r.Config.AccessLogDir != "" {
accessLogWriter, err := GetDailyLogWriter(filepath.Join(r.Config.AccessLogDir, "access.log"))
if err != nil {
return err
}
defer iox.Close(accessLogWriter)
accessLogger := log.New(accessLogWriter, "", 0)
handle = Combined(r.handle, accessLogger.Printf)
}
httpS := &fasthttp.Server{
Handler: handle,
}
// Use the muxed listeners for your servers.
go grpcS.Serve(grpcL)
go httpS.Serve(httpL)
return m.Serve()
}
func (r *Router) recover(dtx *Context) {
recovered := recover()
if recovered == nil {
return
}
log.Printf("E! recovered: %+v", recovered)
if p := r.Config.PanicProcessor; p != nil {
p.PanicProcess(dtx, recovered)
return
}
dtx.Ctx.SetStatusCode(http.StatusInternalServerError)
dtx.Ctx.SetBodyString(fmt.Sprintf("%+v", recovered))
}
func (r *Router) handle(ctx *fasthttp.RequestCtx) {
dtx := &Context{Ctx: ctx}
defer dtx.Release()
defer r.recover(dtx)
err := r.handleService(dtx)
if err == nil {
return
}
for _, p := range r.Config.ErrorProcessors {
if err = p.ProcessError(dtx, err); err == nil {
break
}
}
if err != nil {
log.Printf("E! failed to handleService, error: %v", err)
ctx.SetStatusCode(500)
}
}
func (r *Router) handleService(dtx *Context) error {
serviceName, s := r.findService(dtx)
if s == nil {
if r.Config.NotFoundHandler != nil {
r.Config.NotFoundHandler(dtx)
} else {
dtx.Ctx.NotFound()
}
return nil
}
dtx.ServiceName = serviceName
req, err := s.CreateReq()
if err != nil {
return err
}
dtx.Req = req
for _, p := range r.Config.PreProcessors {
if err := p.PreProcess(dtx); err != nil {
return err
}
}
if p, ok := s.(PreProcessor); ok {
if err := p.PreProcess(dtx); err != nil {
return err
}
}
if err := unmarshalJSON(dtx, req); err != nil {
return err
}
dtx.Rsp, err = s.Process(dtx)
if err != nil {
return err
}
if dtx.Rsp == ResultSendFile {
return nil
}
if p, ok := s.(PostProcessor); ok {
if err := p.PostProcess(dtx); err != nil {
return err
}
}
for i := len(r.Config.PostProcessors) - 1; i >= 0; i-- {
if err := r.Config.PostProcessors[i].PostProcess(dtx); err != nil {
return err
}
}
data, err := marshalJSON(dtx, dtx.Rsp)
if err != nil {
return err
}
dtx.Ctx.SetContentType("application/json; charset=utf-8")
_, err = dtx.Ctx.Write(data)
return err
}
func (r *Router) findService(dtx *Context) (string, Service) {
path := string(dtx.Ctx.Path())
method := string(dtx.Ctx.Method())
key := method + " " + path
if service, ok := r.routers[key]; ok {
return r.routerService[key], service
}
if service, ok := r.routers[path]; ok {
return r.routerService[path], service
}
return "", nil
}
func makeRouterServices(r map[string]Service) map[string]string {
m := make(map[string]string)
for k, v := range r {
name := reflect.TypeOf(v).Elem().String()
if p := strings.LastIndexByte(name, '.'); p > 0 {
name = name[p+1:]
}
m[k] = name
}
return m
}
func ParseArgs(initFiles *embed.FS) Arg {
c := Arg{}
flagparse.Parse(&c,
flagparse.AutoLoadYaml("c", "conf.yml"),
flagparse.ProcessInit(initFiles))
log.Printf("Arg parsed: %+v", c)
// 注册性能采集信号,用法:
// 第一步,通知开始采集:touch jj.cpu; kill -USR1 `pidof dsvs2`;
// 第二部,压力测试开始(或者其他手工测试,等待程序运行一段时间,比如5分钟)
// 第三步,通知结束采集,生成 cpu.profile 文件,命令与第一步相同
// 第四步,下载 cpu.profile 文件,`go tool pprof -http :9402 cpu.profile` 开启浏览器查看
sigx.RegisterSignalProfile()
if c.MaxProcs > 0 {
runtime.GOMAXPROCS(c.MaxProcs)
log.Printf("Changed runtime.GOMAXPROCS to %d", c.MaxProcs)
}
return c
}
func unmarshalJSON(dtx *Context, req interface{}) error {
if req == nil {
return nil
}
if v, ok := req.(easyjson.Unmarshaler); ok {
pt, err := easyjson.UnmarshalPool(Pool, dtx.Ctx.Request.Body(), v)
if pt != nil {
dtx.AppendPoolReturner(pt)
}
return err
}
if ss.Contains(string(dtx.Ctx.Request.Header.Peek("Content-Type")), "json") {
return json.Unmarshal(dtx.Ctx.Request.Body(), req)
}
return nil
}
func marshalJSON(c *Context, rsp interface{}) (data []byte, err error) {
if rsp == nil {
return nil, nil
}
var pt bytebufferpool.PoolReturner
if v, ok := rsp.(easyjson.Marshaler); ok {
data, pt, err = easyjson.MarshalPool(Pool, v)
c.AppendPoolReturner(pt)
return data, err
}
return json.Marshal(rsp)
}