/
storage_engine.go
154 lines (119 loc) · 3.83 KB
/
storage_engine.go
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package main
import (
"fmt"
"log"
"net/url"
"runtime"
"time"
"github.com/couchbase/go-couchbase"
"github.com/couchbase/gocb"
)
type StorageEngine interface {
Insert(key string, value interface{}, expiry uint32) error
Get(key string, returnVal interface{}) error
// GoCB and go-couchbase have different methods of updating, I chose the
// go-couchbase version
Update(key string, expiry uint32, callback couchbase.UpdateFunc) error
}
type GoCouchbaseStorageEngine struct {
Bucket *couchbase.Bucket
}
type GoCBStorageEngine struct {
Bucket *gocb.Bucket
}
type MockStorageEngine struct {
}
func NewMockStorageEngine(couchbaseUrl, bucketName string) *MockStorageEngine {
return &MockStorageEngine{}
}
// couchbaseUrl should have form: http://user:pass@host:8091
func NewGoCouchbaseStorageEngine(couchbaseUrl, bucketName string) *GoCouchbaseStorageEngine {
// couchbase.PoolSize = 1
// couchbase.PoolOverflow = 1
// couchbase.SlowServerCallWarningThreshold = time.Duration(200) * time.Millisecond
u, err := url.Parse(couchbaseUrl)
if err != nil {
panic("Invalid url")
}
if bucketName == "" && u.User != nil {
bucketName = u.User.Username()
}
client, err := couchbase.Connect(u.String())
if err != nil {
panic("Could not create client")
}
pool, err := client.GetPool("default")
if err != nil {
panic("Could not create pool")
}
bucket, err := pool.GetBucket(bucketName)
if err != nil {
panic("Could not create bucket")
}
return &GoCouchbaseStorageEngine{
Bucket: bucket,
}
}
func NewGoCBStorageEngine(couchbaseUrl, bucketName string) *GoCBStorageEngine {
cluster, err := gocb.Connect(couchbaseUrl)
if err != nil {
log.Panicf("Could not connect to %v. Err: %v", couchbaseUrl, err)
}
bucket, err := cluster.OpenBucket(bucketName, "")
if err != nil {
log.Panicf("Could not open bucket: %v. Err: %v", bucket, err)
}
return &GoCBStorageEngine{
Bucket: bucket,
}
}
func (se *GoCBStorageEngine) Insert(key string, value interface{}, expiry uint32) error {
if SlowServerCallWarningThreshold > 0 {
defer slowLog(time.Now(), "call to Insert(%q)", key)
}
_, err := se.Bucket.Insert(key, value, expiry)
return err
}
func (se *GoCouchbaseStorageEngine) Insert(key string, value interface{}, expiry uint32) error {
if SlowServerCallWarningThreshold > 0 {
defer slowLog(time.Now(), "call to Insert(%q)", key)
}
_, err := se.Bucket.Add(key, 0, value)
return err
}
func (se *GoCBStorageEngine) Get(key string, returnValue interface{}) error {
if SlowServerCallWarningThreshold > 0 {
defer slowLog(time.Now(), "call to Get(%q)", key)
}
_, err := se.Bucket.Get(key, returnValue)
return err
}
func (se *GoCBStorageEngine) Update(key string, expiry uint32, callback couchbase.UpdateFunc) error {
return fmt.Errorf("Update not implemented for GoCB yet")
}
func (se *GoCouchbaseStorageEngine) Get(key string, returnValue interface{}) error {
if SlowServerCallWarningThreshold > 0 {
defer slowLog(time.Now(), "call to Get(%q)", key)
}
return se.Bucket.Get(key, returnValue)
}
func (se *GoCouchbaseStorageEngine) Update(key string, expiry uint32, callback couchbase.UpdateFunc) error {
return se.Bucket.Update(key, int(expiry), callback)
}
// Update(key string, expiry uint32, callback couchbase.UpdateFunc) error
func (se *MockStorageEngine) Insert(key string, value interface{}, expiry uint32) error {
return nil
}
func (se *MockStorageEngine) Get(key string, returnValue interface{}) error {
return nil
}
func (se *MockStorageEngine) Update(key string, expiry uint32, callback couchbase.UpdateFunc) error {
return nil
}
func slowLog(startTime time.Time, format string, args ...interface{}) {
if elapsed := time.Now().Sub(startTime); elapsed > SlowServerCallWarningThreshold {
pc, _, _, _ := runtime.Caller(2)
caller := runtime.FuncForPC(pc).Name()
log.Printf(format+" in "+caller+" took "+elapsed.String(), args...)
}
}