release go 1.15

1.15 backport:
discard pidfiles; procd for openwrt can generate it. windows even don't need such functionality.

(cherry picked from commit f28d174)

# Conflicts:
#	.github/workflows/repique_release.yml
#	README.md

README.md

@@ -32,6 +32,8 @@
 
 ## Repique is an advanced DNS stub which can run on different OS such as Windows, Linux, OpenWRT.
 
+### ![golang 1.18.2](https://github.com/AZ-X/MEDIA/blob/master/PNG/repique_presentation/repique1.18.2.png?raw=true)
+
 ### ![openwrt](https://github.com/AZ-X/MEDIA/blob/master/PNG/repique_presentation/fin.PNG?raw=true)
 
 ## Repique is unique in the world because:
@@ -245,7 +247,7 @@ Check out [Releases Page](https://github.com/AZ-X/pique/releases)
 
 ### Installation
 
-[Download the latest release with golang 1.15 for AMD64 on Windows or Linux](https://github.com/AZ-X/pique/releases/tag/v1.2.8)
+[Download the latest release with golang 1.15 for AMD64 on Windows or Linux](https://github.com/AZ-X/pique/releases/tag/v1.2.10)
 
 > Notice:  
 > Releases for OpenWRT won't be included in this repository @github.  
@@ -259,6 +261,19 @@ Since version v1.1.5 of repique, you can use its sub-modules as libraries formal
 
 However you still can get the source code and reuse it by 'git-clone' whatever the version is.
 
+#### Practicable Build with Golang 1.18 or above
+
+There are two options to build from the branch special for go1.18:
+
+1. Change the source code by yourself and compile it.
+1. Mod your own compiler just like what I did, then just compile the source code without modification.
+
+There won't be any binary release targeting 1.18 because the risk of CoT (compiler of things) is extraordinary thus I am quite sluggard to alter the form of linknames.
+
+[branch 1.18 works as below](https://github.com/AZ-X/pique/tree/repique-release-golang1.18)
+
+![repique golang 1.18 double wing](https://raw.githubusercontent.com/AZ-X/MEDIA/master/PNG/repique_presentation/repique1.18.png)  
+
 #### X-Copy deployment
 
 There is no additional service or setup to run repique.

repique/conceptions/bats_cache.go

@@ -15,7 +15,6 @@ type Cache struct {
 	*sync.RWMutex
 	entries map[interface{}]*entry
 	push chan interface{}
-	push2 chan interface{}
 	delete chan interface{}
 	set chan *struct{K interface{}; V *entry}
 	full chan bool
@@ -50,7 +49,6 @@ func NewCache(size int) *Cache {
 	cache.entries = make(map[interface{}]*entry, size)
 	cache.keys.headTail = cache.keys.pack(1<<dequeueBits-1, 1<<dequeueBits-1)
 	cache.push = make(chan interface{}, common.Min(size, bufsize))
-	cache.push2 = make(chan interface{}, common.Min(size, bufsize))
 	cache.delete = make(chan interface{}, common.Min(size, bufsize))
 	cache.set = make(chan *struct{K interface{}; V *entry}, common.Min(size, bufsize))
 	cache.full = make(chan bool, common.Min(size, bufsize))
@@ -61,8 +59,6 @@ func NewCache(size int) *Cache {
 			case key := <-cache.push:
 			full := !cache.keys.pushHead(key)
 			cache.full <- full
-			case key := <-cache.push2:
-			cache.keys.pushHead(key)
 			case key := <-cache.delete:
 			cache.Lock()
 			delete(cache.entries, key)
@@ -115,17 +111,20 @@ func (m *Cache) Add(key, value interface{}) {
 		return
 	}
 	m.RUnlock()
-	m.push <- key
-	if full := <- m.full; full {
+	for {
+		m.push <- key
+		if full := <- m.full; !full {
+			break
+		}
 		if evictee_key, ok := m.keys.popTail(); ok {
-			m.push2 <- key
 			m.RLock()
-			if evictee, ok := m.entries[evictee_key]; ok {
-				m.RUnlock()
-				m.delete <- evictee_key
-				evictee.delete()
-			} else {
-				m.RUnlock()
+			for {
+				if evictee, ok := m.entries[evictee_key]; ok {
+					m.RUnlock()
+					m.delete <- evictee_key
+					evictee.delete()
+					break
+				}
 			}
 		}
 	}

repique/features/dns/channels/remote.go

@@ -34,7 +34,7 @@ func (r *Remote) Init(cfg *Config, f FChannelByName) {
 
 func (r *Remote) Handle(s *Session) Channel {
 	r.f(Channel_Stub).Handle(s)
-	if r.cache_enabled && s.LastState != R_OK {
+	if r.cache_enabled && s.LastState != R_OK && s.LastError != Error_Stub_Internal {
 		if s.rep_job == nil {
 			s.rep_job = &sync.Once{}
 		}