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recv.go
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recv.go
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package csp
import (
"fmt"
"cuelang.org/go/cue"
hofcontext "github.com/hofstadter-io/hof/flow/context"
"github.com/hofstadter-io/hof/flow/flow"
"github.com/hofstadter-io/hof/lib/cuetils"
)
type Recv struct{}
func NewRecv(val cue.Value) (hofcontext.Runner, error) {
return &Recv{}, nil
}
func (T *Recv) Run(ctx *hofcontext.Context) (interface{}, error) {
// fmt.Println("csp.Recv", ctx.Value)
v := ctx.Value
var (
err error
mailbox string
quit string
)
ferr := func() error {
ctx.CUELock.Lock()
defer func() {
ctx.CUELock.Unlock()
}()
q := v.LookupPath(cue.ParsePath("quitMailbox"))
if q.Exists() {
if q.Err() != nil {
return q.Err()
}
quit, err = q.String()
if err != nil {
return err
}
}
nv := v.LookupPath(cue.ParsePath("mailbox"))
if !nv.Exists() {
return fmt.Errorf("in csp.Recv task %s: missing field 'mailbox'", v.Path())
}
if nv.Err() != nil {
return nv.Err()
}
mailbox, err = nv.String()
if err != nil {
return err
}
return nil
}()
if ferr != nil {
return nil, ferr
}
// load mailbox
// fmt.Println("mailbox?:", mailbox)
ci, loaded := ctx.Mailbox.Load(mailbox)
if !loaded {
return nil, fmt.Errorf("channel %q not found", mailbox)
}
c := ci.(chan Msg)
var quitChan chan Msg
if quit != "" {
// fmt.Println("quitMailbox?:", quit)
qi, loaded := ctx.Mailbox.Load(quit)
if !loaded {
return nil, fmt.Errorf("channel %q not found", quit)
}
quitChan = qi.(chan Msg)
}
handler := v.LookupPath(cue.ParsePath("handler"))
if !handler.Exists() {
// fmt.Println("got here")
return nil, handler.Err()
}
// fmt.Println("handler:", handler)
for {
select {
case <-quitChan:
break
case msg := <-c:
fmt.Println("msg:", msg)
var H cue.Value
ferr := func() error {
ctx.CUELock.Lock()
defer func() {
ctx.CUELock.Unlock()
}()
H = ctx.Value.Context().CompileString("{...}")
H = H.Unify(handler)
H = H.FillPath(cue.ParsePath("msg"), msg)
return nil
}()
if ferr != nil {
return nil, ferr
}
s, err := cuetils.PrintCue(H)
if err != nil {
fmt.Println("Error(csp/recv/print):", err)
return nil, nil
}
fmt.Println("H:", s)
p, err := flow.NewFlow(ctx, H)
if err != nil {
fmt.Println("Error(csp/recv/new):", err)
return nil, nil
}
err = p.Start()
if err != nil {
fmt.Println("Error(csp/recv/run):", err)
return nil, nil
}
}
}
}