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send.go
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send.go
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package csp
import (
"fmt"
"cuelang.org/go/cue"
hofcontext "github.com/hofstadter-io/hof/flow/context"
)
type Send struct{}
func NewSend(val cue.Value) (hofcontext.Runner, error) {
return &Send{}, nil
}
func (T *Send) Run(ctx *hofcontext.Context) (interface{}, error) {
// fmt.Println("csp.Send", ctx.Value)
v := ctx.Value
var (
err error
mailbox string
key string
val cue.Value
)
ferr := func() error {
ctx.CUELock.Lock()
defer func() {
ctx.CUELock.Unlock()
}()
val = v.LookupPath(cue.ParsePath("val"))
if !val.Exists() {
return fmt.Errorf("in csp.Send task %s: missing field 'val'", v.Path())
}
if val.Err() != nil {
return val.Err()
}
// fmt.Println("csp.Send().val:", val)
kv := v.LookupPath(cue.ParsePath("key"))
if kv.Exists() {
if kv.Err() != nil {
return kv.Err()
}
key, err = kv.String()
if err != nil {
return err
}
}
nv := v.LookupPath(cue.ParsePath("mailbox"))
if !nv.Exists() {
return fmt.Errorf("in csp.Send 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)
}
msg := Msg{
Key: key,
Val: val,
}
// fmt.Println("sending:", msg)
// send a Msg
c := ci.(chan Msg)
c <- msg
return nil, nil
}