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unpack.go
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unpack.go
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// Copyright (c) 2014-2017 Bitmark Inc.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package transactionrecord
import (
"github.com/bitmark-inc/bitmarkd/account"
"github.com/bitmark-inc/bitmarkd/currency"
"github.com/bitmark-inc/bitmarkd/fault"
"github.com/bitmark-inc/bitmarkd/merkle"
"github.com/bitmark-inc/bitmarkd/util"
)
// turn a byte slice into a record
//
// must cast result to correct type
//
// e.g.
// registration, ok := result.(*transaction.Registration)
// or:
// switch tx := result.(type) {
// case *transaction.Registration:
func (record Packed) Unpack(testing ...bool) (Transaction, int, error) {
recordType, n := util.FromVarint64(record)
switch TagType(recordType) {
case BaseDataTag:
// currency
c := uint64(0)
var currencyLength int
c, currencyLength = util.FromVarint64(record[n:])
n += int(currencyLength)
currency, err := currency.FromUint64(c)
if nil != err {
return nil, 0, err
}
// paymentAddress
paymentAddressLength, paymentAddressOffset := util.FromVarint64(record[n:])
paymentAddress := make([]byte, paymentAddressLength)
n += paymentAddressOffset
copy(paymentAddress, record[n:])
n += int(paymentAddressLength)
// owner public key
ownerLength, ownerOffset := util.FromVarint64(record[n:])
n += ownerOffset
owner, err := account.AccountFromBytes(record[n : n+int(ownerLength)])
if nil != err {
return nil, 0, err
}
if len(testing) > 0 && owner.IsTesting() != testing[0] {
return nil, 0, fault.ErrWrongNetworkForPublicKey
}
n += int(ownerLength)
// nonce
nonce := uint64(0)
var nonceLength int
nonce, nonceLength = util.FromVarint64(record[n:])
n += int(nonceLength)
// signature is remainder of record
signatureLength, signatureOffset := util.FromVarint64(record[n:])
signature := make(account.Signature, signatureLength)
n += signatureOffset
copy(signature, record[n:])
n += int(signatureLength)
r := &BaseData{
Owner: owner,
Currency: currency,
PaymentAddress: string(paymentAddress),
Nonce: nonce,
Signature: signature,
}
return r, n, nil
case AssetDataTag:
// name
nameLength, nameOffset := util.FromVarint64(record[n:])
name := make([]byte, nameLength)
n += nameOffset
copy(name, record[n:])
n += int(nameLength)
// fingerprint
fingerprintLength, fingerprintOffset := util.FromVarint64(record[n:])
fingerprint := make([]byte, fingerprintLength)
n += fingerprintOffset
copy(fingerprint, record[n:])
n += int(fingerprintLength)
// metadata
metadataLength, metadataOffset := util.FromVarint64(record[n:])
metadata := make([]byte, metadataLength)
n += metadataOffset
copy(metadata, record[n:])
n += int(metadataLength)
// registrant public key
registrantLength, registrantOffset := util.FromVarint64(record[n:])
n += registrantOffset
registrant, err := account.AccountFromBytes(record[n : n+int(registrantLength)])
if nil != err {
return nil, 0, err
}
if len(testing) > 0 && registrant.IsTesting() != testing[0] {
return nil, 0, fault.ErrWrongNetworkForPublicKey
}
n += int(registrantLength)
// signature is remainder of record
signatureLength, signatureOffset := util.FromVarint64(record[n:])
signature := make(account.Signature, signatureLength)
n += signatureOffset
copy(signature, record[n:])
n += int(signatureLength)
r := &AssetData{
Name: string(name),
Fingerprint: string(fingerprint),
Metadata: string(metadata),
Registrant: registrant,
Signature: signature,
}
return r, n, nil
case BitmarkIssueTag:
// asset index
assetIndexLength, assetIndexOffset := util.FromVarint64(record[n:])
n += assetIndexOffset
var assetIndex AssetIndex
err := AssetIndexFromBytes(&assetIndex, record[n:n+int(assetIndexLength)])
if nil != err {
return nil, 0, err
}
n += int(assetIndexLength)
// owner public key
ownerLength, ownerOffset := util.FromVarint64(record[n:])
n += ownerOffset
owner, err := account.AccountFromBytes(record[n : n+int(ownerLength)])
if nil != err {
return nil, 0, err
}
if len(testing) > 0 && owner.IsTesting() != testing[0] {
return nil, 0, fault.ErrWrongNetworkForPublicKey
}
n += int(ownerLength)
// nonce
nonce := uint64(0)
var nonceLength int
nonce, nonceLength = util.FromVarint64(record[n:])
n += int(nonceLength)
// signature is remainder of record
signatureLength, signatureOffset := util.FromVarint64(record[n:])
signature := make(account.Signature, signatureLength)
n += signatureOffset
copy(signature, record[n:])
n += int(signatureLength)
r := &BitmarkIssue{
AssetIndex: assetIndex,
Owner: owner,
Signature: signature,
Nonce: nonce,
}
return r, n, nil
case BitmarkTransferTag:
// link
linkLength, linkOffset := util.FromVarint64(record[n:])
n += linkOffset
var link merkle.Digest
err := merkle.DigestFromBytes(&link, record[n:n+int(linkLength)])
if nil != err {
return nil, 0, err
}
n += int(linkLength)
// optional payment
payment := (*Payment)(nil)
if 0 == record[n] {
n += 1
} else if 1 == record[n] {
n += 1
// currency
c := uint64(0)
var currencyLength int
c, currencyLength = util.FromVarint64(record[n:])
n += int(currencyLength)
currency, err := currency.FromUint64(c)
if nil != err {
return nil, 0, err
}
// address
addressLength, addressOffset := util.FromVarint64(record[n:])
address := make([]byte, addressLength)
n += addressOffset
copy(address, record[n:])
n += int(addressLength)
// amount
amount, amountLength := util.FromVarint64(record[n:])
n += int(amountLength)
payment = &Payment{
Currency: currency,
Address: string(address),
Amount: amount,
}
} else {
return nil, 0, fault.ErrNotTransactionPack
}
// owner public key
ownerLength, ownerOffset := util.FromVarint64(record[n:])
n += ownerOffset
owner, err := account.AccountFromBytes(record[n : n+int(ownerLength)])
if nil != err {
return nil, 0, err
}
if len(testing) > 0 && owner.IsTesting() != testing[0] {
return nil, 0, fault.ErrWrongNetworkForPublicKey
}
n += int(ownerLength)
// signature is remainder of record
signatureLength, signatureOffset := util.FromVarint64(record[n:])
signature := make(account.Signature, signatureLength)
n += signatureOffset
copy(signature, record[n:])
n += int(signatureLength)
r := &BitmarkTransfer{
Link: link,
Payment: payment,
Owner: owner,
Signature: signature,
}
return r, n, nil
default:
}
return nil, 0, fault.ErrNotTransactionPack
}