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fiber.go
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fiber.go
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package janet
/*
#cgo CFLAGS: -std=c99
#cgo LDFLAGS: -lm -ldl
#include <janet.h>
#include <api.h>
*/
import "C"
import _ "embed"
import (
"context"
"fmt"
"reflect"
"unsafe"
)
type Result struct {
Out *Value
Error error
}
type Params struct {
Context context.Context
User interface{}
Result chan Result
}
// Make new Params with an overwritten Result channel.
func (p Params) Pipe() Params {
return Params{
Context: p.Context,
User: p.User,
Result: make(chan Result),
}
}
func (p Params) Error(err error) {
p.Result <- Result{
Error: err,
}
}
func (p Params) Ok() {
p.Error(nil)
}
func (p Params) Out(value *Value) {
p.Result <- Result{
Out: value,
}
}
func (p Params) Wait() error {
select {
case result := <-p.Result:
if result.Out != nil {
result.Out.Free()
}
return result.Error
case <-p.Context.Done():
return p.Context.Err()
}
}
type fiberRequest struct {
Params
// The fiber to run
Fiber Fiber
// The value with which to resume
In *Value
}
func (v *VM) createFiber(fun *C.JanetFunction, args []C.Janet) Fiber {
argPtr := unsafe.Pointer(nil)
if len(args) > 0 {
argPtr = unsafe.Pointer(&args[0])
}
fiber := C.janet_fiber(
fun,
64,
C.int(len(args)),
(*C.Janet)(argPtr),
)
return Fiber{
Value: v.value(C.janet_wrap_fiber(fiber)),
fiber: fiber,
}
}
// Run a fiber to completion.
func (v *VM) runFiber(params Params, fiber Fiber, in *Value) {
v.requests <- fiberRequest{
Params: params,
Fiber: fiber,
In: in,
}
}
func (v *VM) handleYield(params Params, fiber Fiber, out C.Janet) {
if C.janet_checktype(out, C.JANET_TUPLE) == 0 {
params.Error(fmt.Errorf("(yield) called with non-tuple"))
return
}
args := make([]C.Janet, 0)
for i := 0; i < int(C.janet_length(out)); i++ {
args = append(
args,
C.janet_get(
out,
C.janet_wrap_integer(C.int(i)),
),
)
}
partial, err := v.setupCallback(params, args)
if err != nil {
params.Error(err)
return
}
outc := make(chan []reflect.Value)
go func() {
outc <- partial.Call()
}()
go func() {
select {
case <-params.Context.Done():
params.Error(params.Context.Err())
return
case out := <-outc:
v.requests <- resolveRequest{
Params: params,
Fiber: fiber,
Type: partial.Type,
Out: out,
}
}
}()
return
}
func (v *VM) continueFiber(params Params, fiber Fiber, in *Value) {
arg := C.janet_wrap_nil()
if in != nil {
arg = in.janet
defer in.unroot()
}
var out C.Janet
signal := C.janet_continue(
fiber.fiber,
arg,
&out,
)
switch signal {
case C.JANET_SIGNAL_OK:
params.Out(v.value(out))
return
case C.JANET_SIGNAL_ERROR:
var errStr string
v.unmarshal(out, &errStr)
params.Error(fmt.Errorf("%s", errStr))
return
case C.JANET_SIGNAL_YIELD:
v.handleYield(params, fiber, out)
default:
params.Error(fmt.Errorf("unrecognized signal: %d", signal))
return
}
}