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pipeline.go
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pipeline.go
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package nano
import (
"fmt"
"github.com/lonng/nano/internal/message"
"github.com/lonng/nano/session"
"sync/atomic"
)
type (
Message struct {
*message.Message
}
PipelineFunc func(s *session.Session, msg Message) error
Pipeline interface {
Outbound() PipelineChannel
Inbound() PipelineChannel
}
pipeline struct {
outbound, inbound *pipelineChannel
}
PipelineChannel interface {
PushFront(h PipelineFunc)
PushBack(h PipelineFunc)
Process(s *session.Session, msg Message) error
}
pipelineChannel struct {
handlers []PipelineFunc
}
)
func NewPipeline() Pipeline {
return &pipeline{
outbound: &pipelineChannel{},
inbound: &pipelineChannel{},
}
}
func (p *pipeline) Outbound() PipelineChannel { return p.outbound }
func (p *pipeline) Inbound() PipelineChannel { return p.inbound }
// PushFront should not be used after nano running
func (p *pipelineChannel) PushFront(h PipelineFunc) {
if atomic.LoadInt32(&running) > 0 {
logger.Println("PushFront should not be used after Nano running")
return
}
handlers := make([]PipelineFunc, len(p.handlers)+1)
handlers[0] = h
copy(handlers[1:], p.handlers)
p.handlers = handlers
}
// PushBack should not be used after nano running
func (p *pipelineChannel) PushBack(h PipelineFunc) {
if atomic.LoadInt32(&running) > 0 {
logger.Println("PushFront should not be used after Nano running")
return
}
p.handlers = append(p.handlers, h)
}
func (p *pipelineChannel) Process(s *session.Session, msg Message) error {
if len(p.handlers) < 1 {
return nil
}
for _, h := range p.handlers {
if err := h(s, msg); err != nil {
logger.Println(fmt.Sprintf("nano/handler: broken pipeline: %s", err.Error()))
return err
}
}
return nil
}