remove locking from accounts service

add a cached named rwlock pkg
use sync.map in the cache pkg
use named rwlock in indexer pkg
use sync.map in indexer pkg
remove husky

ocis-pkg/sync/mutex.go

@@ -0,0 +1,67 @@
+package sync
+
+import (
+	"sync"
+)
+
+type NRWMutex struct {
+	m  sync.Mutex
+	mm map[string]*nrw
+}
+
+type nrw struct {
+	m sync.RWMutex
+	c int
+}
+
+func NewNRWMutex() NRWMutex {
+	return NRWMutex{mm: make(map[string]*nrw)}
+}
+
+func (c *NRWMutex) Lock(k string) {
+	c.m.Lock()
+	m := c.get(k)
+	m.c++
+	c.m.Unlock()
+	m.m.Lock()
+}
+
+func (c *NRWMutex) Unlock(k string) {
+	c.m.Lock()
+	defer c.m.Unlock()
+	m := c.get(k)
+	m.m.Unlock()
+	m.c--
+	if m.c == 0 {
+		delete(c.mm, k)
+	}
+}
+
+func (c *NRWMutex) RLock(k string) {
+	c.m.Lock()
+	m := c.get(k)
+	m.c++
+	c.m.Unlock()
+	m.m.RLock()
+}
+
+func (c *NRWMutex) RUnlock(k string) {
+	c.m.Lock()
+	defer c.m.Unlock()
+	m := c.get(k)
+	m.m.RUnlock()
+	m.c--
+	if m.c == 0 {
+		delete(c.mm, k)
+	}
+}
+
+func (c *NRWMutex) get(k string) *nrw {
+	m, ok := c.mm[k]
+	if !ok {
+		m = &nrw{}
+		c.mm[k] = m
+	}
+
+	return m
+}

ocis-pkg/sync/mutex_test.go

@@ -0,0 +1,33 @@
+package sync
+
+import (
+	"fmt"
+	"runtime"
+	"testing"
+)
+
+func HammerMutex(m *NRWMutex, loops int, cdone chan bool) {
+	for i := 0; i < loops; i++ {
+		id := fmt.Sprintf("%v", i)
+		m.Lock(id)
+		m.Unlock(id)
+	}
+	cdone <- true
+}
+
+func TestMutex(t *testing.T) {
+	if n := runtime.SetMutexProfileFraction(1); n != 0 {
+		t.Logf("got mutexrate %d expected 0", n)
+	}
+	defer runtime.SetMutexProfileFraction(0)
+	m := NewNRWMutex()
+	c := make(chan bool)
+	r := 10
+
+	for i := 0; i < r; i++ {
+		go HammerMutex(&m, 2000, c)
+	}
+	for i := 0; i < r; i++ {
+		<-c
+	}
+}