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context.go
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context.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package wsremote
import (
"context"
"sync"
"namespacelabs.dev/foundation/internal/wscontents"
)
type contextKey string
var (
_registrarKey = contextKey("fn.internal.wsremote.registrar")
)
type SinkRegistrar struct {
deposit DepositFunc
}
type DepositFunc func(context.Context, *Signature, []*wscontents.FileEvent) (bool, error)
func Ctx(ctx context.Context) *SinkRegistrar {
raw := ctx.Value(_registrarKey)
if raw == nil {
return nil
}
return raw.(*SinkRegistrar)
}
func BufferAndSinkTo(ctx context.Context, f DepositFunc) (context.Context, *SinkRegistrar) {
r := &SinkRegistrar{f}
newCtx := context.WithValue(ctx, _registrarKey, r)
return newCtx, r
}
func (r *SinkRegistrar) For(sig *Signature) Sink {
return &bufferingSink{r: r, sig: sig}
}
type bufferingSink struct {
r *SinkRegistrar
sig *Signature
mu sync.Mutex
buffered []*wscontents.FileEvent
}
func (s *bufferingSink) Deposit(ctx context.Context, events []*wscontents.FileEvent) (bool, error) {
s.mu.Lock()
defer s.mu.Unlock()
// XXX manage queue length.
s.buffered = append(s.buffered, events...)
deposited, err := s.r.deposit(ctx, s.sig, s.buffered)
if err != nil {
return false, err
}
if deposited {
s.buffered = nil
}
return true, nil
}