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asset.go
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asset.go
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// Copyright (c) 2014-2016 Bitmark Inc.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package asset
import (
"github.com/bitmark-inc/bitmarkd/background"
"github.com/bitmark-inc/bitmarkd/fault"
"github.com/bitmark-inc/bitmarkd/storage"
"github.com/bitmark-inc/bitmarkd/transactionrecord"
"github.com/bitmark-inc/logger"
"sync"
)
// condition of asset in the state buffer
type assetState int
// possible states
const (
pendingState assetState = iota
expiringState
verifiedState
)
// the cached data
type cacheData struct {
packed transactionrecord.Packed // data
state assetState // used to detect expired/verified items
}
// expiry background
type expiryData struct {
log *logger.L
queue chan transactionrecord.AssetIndex
}
// globals
type globalDataType struct {
sync.RWMutex
log *logger.L
expiry expiryData
background *background.T
cache map[transactionrecord.AssetIndex]*cacheData
}
// gobal storage
var globalData globalDataType
// initialise the asset cache
func Initialise() error {
globalData.log = logger.New("asset")
if nil == globalData.log {
return fault.ErrInvalidLoggerChannel
}
globalData.log.Info("starting…")
// for expiry requests, only a small queue should be sufficient
globalData.expiry.log = logger.New("asset-expiry")
if nil == globalData.expiry.log {
return fault.ErrInvalidLoggerChannel
}
globalData.expiry.queue = make(chan transactionrecord.AssetIndex, 10)
globalData.cache = make(map[transactionrecord.AssetIndex]*cacheData)
// list of background processes to start
var processes = background.Processes{
&globalData.expiry,
}
globalData.background = background.Start(processes, globalData.log)
return nil
}
// stop all background handlers
func Finalise() {
// stop background
globalData.background.Stop()
}
// cache an incoming asset
func Cache(asset *transactionrecord.AssetData) (*transactionrecord.AssetIndex, transactionrecord.Packed, error) {
packedAsset, err := asset.Pack(asset.Registrant)
if nil != err {
return nil, nil, err
}
assetIndex := asset.AssetIndex()
// already confirmed
if storage.Pool.Assets.Has(assetIndex[:]) {
return &assetIndex, nil, nil
}
// create a cache entry
d := &cacheData{
packed: packedAsset,
state: pendingState,
}
// flag to indicate asset data would be changed
dataWouldChange := false
// cache the record, will update partially expired item with new flag
// causing the expiry routine to allow an extra timeout period
globalData.Lock()
if r, ok := globalData.cache[assetIndex]; !ok {
globalData.cache[assetIndex] = d
} else {
transaction, _, err := transactionrecord.Packed(r.packed).Unpack()
fault.PanicIfError("asset: bad packed record", err)
switch tx := transaction.(type) {
case (*transactionrecord.AssetData):
if tx.Name == asset.Name &&
tx.Fingerprint == asset.Fingerprint &&
tx.Metadata == asset.Metadata &&
tx.Registrant.String() == asset.Registrant.String() {
r.state = pendingState // extend timeout
packedAsset = nil // already seen
} else {
dataWouldChange = true
}
default:
fault.Panicf("asset: non asset record in cache: %v", tx)
}
}
globalData.Unlock()
// report invalid asset changes
if dataWouldChange {
return nil, nil, fault.ErrAssetsAlreadyRegistered
}
// queue for expiry
globalData.expiry.queue <- assetIndex
// if packedAsset is not nil then should broadcast
return &assetIndex, packedAsset, nil
}
// check if an asset exists
func Exists(assetIndex transactionrecord.AssetIndex) bool {
// already confirmed
if storage.Pool.Assets.Has(assetIndex[:]) {
return true
}
globalData.RLock()
_, ok := globalData.cache[assetIndex]
globalData.RUnlock()
return ok
}
// get packed asset data from cache (nil if not present)
func Get(assetIndex transactionrecord.AssetIndex) transactionrecord.Packed {
globalData.RLock()
item := globalData.cache[assetIndex]
globalData.RUnlock()
if nil == item {
return nil
}
return item.packed
}
// remove an asset from the cache
func Delete(assetIndex transactionrecord.AssetIndex) {
globalData.Lock()
delete(globalData.cache, assetIndex)
globalData.Unlock()
}
// mark a cached asset being verified
func SetVerified(assetIndex transactionrecord.AssetIndex) {
// already confirmed
if storage.Pool.Assets.Has(assetIndex[:]) {
return
}
// fetch the buffered data
globalData.RLock()
data, ok := globalData.cache[assetIndex]
if ok {
// flag as verified
data.state = verifiedState
}
globalData.RUnlock()
// fatal error if cache is missing
if !ok {
fault.Panicf("asset: Store: no cache for asset id: %v", assetIndex)
}
}