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context.go
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context.go
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package tanukirpc
import (
gocontext "context"
"fmt"
"net/http"
"path/filepath"
"runtime"
)
type Context[Reg any] interface {
gocontext.Context
Request() *http.Request
Response() http.ResponseWriter
Registry() Reg
Defer(fn DeferFunc, priority ...DeferDoTiming)
DeferDo(priority DeferDoTiming) error
}
type context[Reg any] struct {
gocontext.Context
req *http.Request
res http.ResponseWriter
registry Reg
deferStackMap deferStackMap
}
type ContextFactory[Reg any] interface {
Build(w http.ResponseWriter, req *http.Request) (Context[Reg], error)
}
type DefaultContextFactory[Reg any] struct {
registry Reg
}
func (d *DefaultContextFactory[Reg]) Build(w http.ResponseWriter, req *http.Request) (Context[Reg], error) {
return &context[Reg]{
Context: req.Context(),
req: req,
res: w,
registry: d.registry,
}, nil
}
func (c *context[Reg]) Request() *http.Request {
return c.req
}
func (c *context[Reg]) Response() http.ResponseWriter {
return c.res
}
func (c *context[Reg]) Registry() Reg {
return c.registry
}
func (c *context[Reg]) Defer(fn DeferFunc, timings ...DeferDoTiming) {
pc, file, line, ok := runtime.Caller(1)
timing := DeferDoTimingAfterResponse
if len(timings) > 0 {
timing = timings[0]
}
c.deferStackMap.push(
timing,
&deferAction{
fn: fn,
caller: &DeferFuncCallerStack{
PC: pc,
File: file,
Line: line,
Ok: ok,
},
},
)
}
func (c *context[Reg]) DeferDo(timing DeferDoTiming) error {
return c.deferStackMap.do(timing)
}
type contextHookFactory[Reg any] struct {
fn func(w http.ResponseWriter, req *http.Request) (Reg, error)
}
func NewContextHookFactory[Reg any](fn func(w http.ResponseWriter, req *http.Request) (Reg, error)) ContextFactory[Reg] {
return &contextHookFactory[Reg]{fn: fn}
}
func (c *contextHookFactory[Reg]) Build(w http.ResponseWriter, req *http.Request) (Context[Reg], error) {
registry, err := c.fn(w, req)
if err != nil {
return nil, err
}
return &context[Reg]{
Context: req.Context(),
req: req,
res: w,
registry: registry,
}, nil
}
type Transformer[Reg1 any, Reg2 any] interface {
Transform(ctx Context[Reg1]) (Reg2, error)
}
func NewTransformer[Reg1 any, Reg2 any](fn func(ctx Context[Reg1]) (Reg2, error)) Transformer[Reg1, Reg2] {
return &transformer[Reg1, Reg2]{fn: fn}
}
type transformer[Reg1 any, Reg2 any] struct {
fn func(ctx Context[Reg1]) (Reg2, error)
}
func (t *transformer[Reg1, Reg2]) Transform(ctx Context[Reg1]) (Reg2, error) {
return t.fn(ctx)
}
func compositionContextHooker[Reg1 any, Reg2 any](factory ContextFactory[Reg1], transformer Transformer[Reg1, Reg2]) ContextFactory[Reg2] {
return NewContextHookFactory(func(w http.ResponseWriter, req *http.Request) (Reg2, error) {
var zeroReg2 Reg2
ctx1, err := factory.Build(w, req)
if err != nil {
return zeroReg2, err
}
reg2, err := transformer.Transform(ctx1)
if err != nil {
return zeroReg2, err
}
return reg2, nil
})
}
type DeferFunc func() error
type deferAction struct {
fn DeferFunc
caller *DeferFuncCallerStack
}
type DeferFuncError struct {
Err error
Caller *DeferFuncCallerStack
}
type DeferFuncCallerStack struct {
PC uintptr
File string
Line int
Ok bool
}
func (d *DeferFuncCallerStack) String() string {
if !d.Ok {
return "unknown"
}
f := runtime.FuncForPC(d.PC)
file := filepath.Base(d.File)
return fmt.Sprintf("%s:%d %s", file, d.Line, f.Name())
}
func (d *DeferFuncError) Error() string {
return fmt.Sprintf(
"occured error in Deferred func that registered at %s: %s",
d.Caller.String(),
d.Err.Error(),
)
}
func (d *DeferFuncError) Unwrap() error {
return d.Err
}
func (d *deferAction) do() error {
if err := d.fn(); err != nil {
return &DeferFuncError{Err: err, Caller: d.caller}
}
return nil
}
type DeferDoTiming int
const (
DeferDoTimingBeforeResponse DeferDoTiming = iota
DeferDoTimingAfterResponse
)
type deferStackMap map[DeferDoTiming]*deferStack
func (d *deferStackMap) push(t DeferDoTiming, da *deferAction) {
if *d == nil {
*d = make(deferStackMap, 1)
}
if _, ok := (*d)[t]; !ok {
ds := make(deferStack, 0, 1)
(*d)[t] = &ds
}
(*d)[t].push(da)
}
func (d *deferStackMap) do(t DeferDoTiming) error {
if *d == nil {
return nil
}
if _, ok := (*d)[t]; !ok {
return nil
}
return (*d)[t].do()
}
type deferStack []*deferAction
func (d *deferStack) push(da *deferAction) {
if (*d) == nil {
*d = make([]*deferAction, 0, 1)
}
*d = append(*d, da)
}
func (d *deferStack) pop() *deferAction {
if len(*d) == 0 {
return nil
}
da := (*d)[len(*d)-1]
*d = (*d)[:len(*d)-1]
return da
}
func (d *deferStack) do() error {
if len(*d) == 0 {
return nil
}
for {
da := d.pop()
if da == nil {
break
}
if err := da.fn(); err != nil {
return err
}
}
return nil
}