mirror of https://github.com/ethereum/go-ethereum
* resolver -> common/registrar * global registrar name registry interface * add Call to resolver backend interface * the hashReg and UrlHing contracts now initialised from global registry * initialization of contracts uniform * improve errors and more econsistent method names * common/registrar/ethreg: versioned registrar * integrate new naming and registrar in natspec * js console api: setGlobalRegistrar, setHashReg, setUrlHint * js test TestContract uses mining - tests fixed all pass * eth/backend: allow PoW test mode (small ethash DAG) * console jsre refers to resolver.abi/addr, * cmd/geth/contracts.go moved to common/registrarpull/1429/head
zelig
9 years ago
committed by
Jeffrey Wilcke
parent
d764bd0584
commit
83ee39448e
@ -1,6 +0,0 @@ |
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package main |
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|
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var ( |
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globalRegistrar = `var GlobalRegistrar = web3.eth.contract([{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"name","outputs":[{"name":"o_name","type":"bytes32"}],"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"}],"name":"owner","outputs":[{"name":"","type":"address"}],"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"}],"name":"content","outputs":[{"name":"","type":"bytes32"}],"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"}],"name":"addr","outputs":[{"name":"","type":"address"}],"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"}],"name":"reserve","outputs":[],"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"}],"name":"subRegistrar","outputs":[{"name":"o_subRegistrar","type":"address"}],"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"},{"name":"_newOwner","type":"address"}],"name":"transfer","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"},{"name":"_registrar","type":"address"}],"name":"setSubRegistrar","outputs":[],"type":"function"},{"constant":false,"inputs":[],"name":"Registrar","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"},{"name":"_a","type":"address"},{"name":"_primary","type":"bool"}],"name":"setAddress","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"},{"name":"_content","type":"bytes32"}],"name":"setContent","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"}],"name":"disown","outputs":[],"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"}],"name":"register","outputs":[{"name":"","type":"address"}],"type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"name","type":"bytes32"}],"name":"Changed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"name","type":"bytes32"},{"indexed":true,"name":"addr","type":"address"}],"name":"PrimaryChanged","type":"event"}]);` |
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globalRegistrarAddr = "0xc6d9d2cd449a754c494264e1809c50e34d64562b" |
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) |
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File diff suppressed because one or more lines are too long
@ -0,0 +1,32 @@ |
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package ethreg |
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|
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import ( |
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"math/big" |
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|
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"github.com/ethereum/go-ethereum/common/registrar" |
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"github.com/ethereum/go-ethereum/xeth" |
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) |
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|
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// implements a versioned Registrar on an archiving full node
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type EthReg struct { |
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backend *xeth.XEth |
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registry *registrar.Registrar |
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} |
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func New(xe *xeth.XEth) (self *EthReg) { |
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self = &EthReg{backend: xe} |
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self.registry = registrar.New(xe) |
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return |
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} |
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func (self *EthReg) Registry() *registrar.Registrar { |
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return self.registry |
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} |
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func (self *EthReg) Resolver(n *big.Int) *registrar.Registrar { |
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xe := self.backend |
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if n != nil { |
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xe = self.backend.AtStateNum(n.Int64()) |
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} |
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return registrar.New(xe) |
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} |
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@ -0,0 +1,398 @@ |
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package registrar |
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import ( |
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"encoding/binary" |
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"fmt" |
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"math/big" |
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"regexp" |
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|
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/crypto" |
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"github.com/ethereum/go-ethereum/logger" |
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"github.com/ethereum/go-ethereum/logger/glog" |
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) |
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|
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/* |
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Registrar implements the Ethereum name registrar services mapping |
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- arbitrary strings to ethereum addresses |
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- hashes to hashes |
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- hashes to arbitrary strings |
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(likely will provide lookup service for all three) |
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The Registrar is used by |
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* the roundtripper transport implementation of |
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url schemes to resolve domain names and services that register these names |
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* contract info retrieval (NatSpec). |
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|
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The Registrar uses 3 contracts on the blockchain: |
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* GlobalRegistrar: Name (string) -> Address (Owner) |
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* HashReg : Key Hash (hash of domain name or contract code) -> Content Hash |
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* UrlHint : Content Hash -> Url Hint |
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These contracts are (currently) not included in the genesis block. |
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Each Set<X> needs to be called once on each blockchain/network once. |
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Contract addresses need to be set (HashReg and UrlHint retrieved from the global |
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registrar the first time any Registrar method is called in a client session |
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So the caller needs to make sure the relevant environment initialised the desired |
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contracts |
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*/ |
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var ( |
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UrlHintAddr = "0x0" |
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HashRegAddr = "0x0" |
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// GlobalRegistrarAddr = "0x0"
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GlobalRegistrarAddr = "0xc6d9d2cd449a754c494264e1809c50e34d64562b" |
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zero = regexp.MustCompile("^(0x)?0*$") |
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) |
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const ( |
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trueHex = "0000000000000000000000000000000000000000000000000000000000000001" |
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falseHex = "0000000000000000000000000000000000000000000000000000000000000000" |
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) |
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func abiSignature(s string) string { |
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return common.ToHex(crypto.Sha3([]byte(s))[:4]) |
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} |
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var ( |
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HashRegName = "HashReg" |
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UrlHintName = "UrlHint" |
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registerContentHashAbi = abiSignature("register(uint256,uint256)") |
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registerUrlAbi = abiSignature("register(uint256,uint8,uint256)") |
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setOwnerAbi = abiSignature("setowner()") |
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reserveAbi = abiSignature("reserve(bytes32)") |
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resolveAbi = abiSignature("addr(bytes32)") |
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registerAbi = abiSignature("setAddress(bytes32,address,bool)") |
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addressAbiPrefix = falseHex[:24] |
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) |
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// Registrar's backend is defined as an interface (implemented by xeth, but could be remote)
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type Backend interface { |
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StorageAt(string, string) string |
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Transact(fromStr, toStr, nonceStr, valueStr, gasStr, gasPriceStr, codeStr string) (string, error) |
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Call(fromStr, toStr, valueStr, gasStr, gasPriceStr, codeStr string) (string, string, error) |
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} |
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// TODO Registrar should also just implement The Resolver and Registry interfaces
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// Simplify for now.
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type VersionedRegistrar interface { |
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Resolver(*big.Int) *Registrar |
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Registry() *Registrar |
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} |
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type Registrar struct { |
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backend Backend |
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} |
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func New(b Backend) (res *Registrar) { |
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res = &Registrar{b} |
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return |
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} |
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func (self *Registrar) SetGlobalRegistrar(namereg string, addr common.Address) (err error) { |
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if namereg != "" { |
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GlobalRegistrarAddr = namereg |
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return |
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} |
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if GlobalRegistrarAddr == "0x0" || GlobalRegistrarAddr == "0x" { |
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if (addr == common.Address{}) { |
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err = fmt.Errorf("GlobalRegistrar address not found and sender for creation not given") |
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return |
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} else { |
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GlobalRegistrarAddr, err = self.backend.Transact(addr.Hex(), "", "", "", "800000", "", GlobalRegistrarCode) |
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if err != nil { |
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err = fmt.Errorf("GlobalRegistrar address not found and sender for creation failed: %v", err) |
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return |
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} |
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} |
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} |
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return |
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} |
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func (self *Registrar) SetHashReg(hashreg string, addr common.Address) (err error) { |
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if hashreg != "" { |
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HashRegAddr = hashreg |
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} else { |
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if !zero.MatchString(HashRegAddr) { |
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return |
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} |
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nameHex, extra := encodeName(HashRegName, 2) |
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hashRegAbi := resolveAbi + nameHex + extra |
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glog.V(logger.Detail).Infof("\ncall HashRegAddr %v with %v\n", GlobalRegistrarAddr, hashRegAbi) |
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HashRegAddr, _, err = self.backend.Call("", GlobalRegistrarAddr, "", "", "", hashRegAbi) |
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if err != nil || zero.MatchString(HashRegAddr) { |
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if (addr == common.Address{}) { |
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err = fmt.Errorf("HashReg address not found and sender for creation not given") |
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return |
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} |
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HashRegAddr, err = self.backend.Transact(addr.Hex(), "", "", "", "200000", "", HashRegCode) |
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if err != nil { |
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err = fmt.Errorf("HashReg address not found and sender for creation failed: %v", err) |
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} |
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glog.V(logger.Detail).Infof("created HashRegAddr @ %v\n", HashRegAddr) |
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} else { |
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glog.V(logger.Detail).Infof("HashRegAddr found at @ %v\n", HashRegAddr) |
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return |
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} |
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} |
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// register as HashReg
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self.ReserveName(addr, HashRegName) |
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self.SetAddressToName(addr, HashRegName, common.HexToAddress(HashRegAddr)) |
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return |
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} |
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func (self *Registrar) SetUrlHint(urlhint string, addr common.Address) (err error) { |
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if urlhint != "" { |
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UrlHintAddr = urlhint |
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} else { |
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if !zero.MatchString(UrlHintAddr) { |
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return |
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} |
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nameHex, extra := encodeName(UrlHintName, 2) |
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urlHintAbi := resolveAbi + nameHex + extra |
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glog.V(logger.Detail).Infof("UrlHint address query data: %s to %s", urlHintAbi, GlobalRegistrarAddr) |
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UrlHintAddr, _, err = self.backend.Call("", GlobalRegistrarAddr, "", "", "", urlHintAbi) |
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if err != nil || zero.MatchString(UrlHintAddr) { |
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if (addr == common.Address{}) { |
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err = fmt.Errorf("UrlHint address not found and sender for creation not given") |
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return |
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} |
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UrlHintAddr, err = self.backend.Transact(addr.Hex(), "", "", "", "210000", "", UrlHintCode) |
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if err != nil { |
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err = fmt.Errorf("UrlHint address not found and sender for creation failed: %v", err) |
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} |
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glog.V(logger.Detail).Infof("created UrlHint @ %v\n", HashRegAddr) |
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} else { |
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glog.V(logger.Detail).Infof("UrlHint found @ %v\n", HashRegAddr) |
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return |
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} |
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} |
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// register as UrlHint
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self.ReserveName(addr, UrlHintName) |
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self.SetAddressToName(addr, UrlHintName, common.HexToAddress(UrlHintAddr)) |
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return |
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} |
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// ReserveName(from, name) reserves name for the sender address in the globalRegistrar
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// the tx needs to be mined to take effect
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func (self *Registrar) ReserveName(address common.Address, name string) (txh string, err error) { |
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nameHex, extra := encodeName(name, 2) |
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abi := reserveAbi + nameHex + extra |
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glog.V(logger.Detail).Infof("Reserve data: %s", abi) |
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return self.backend.Transact( |
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address.Hex(), |
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GlobalRegistrarAddr, |
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"", "", "", "", |
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abi, |
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) |
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} |
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// SetAddressToName(from, name, addr) will set the Address to address for name
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// in the globalRegistrar using from as the sender of the transaction
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// the tx needs to be mined to take effect
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func (self *Registrar) SetAddressToName(from common.Address, name string, address common.Address) (txh string, err error) { |
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nameHex, extra := encodeName(name, 6) |
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addrHex := encodeAddress(address) |
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abi := registerAbi + nameHex + addrHex + trueHex + extra |
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glog.V(logger.Detail).Infof("SetAddressToName data: %s to %s ", abi, GlobalRegistrarAddr) |
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return self.backend.Transact( |
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from.Hex(), |
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GlobalRegistrarAddr, |
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"", "", "", "", |
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abi, |
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) |
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} |
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// NameToAddr(from, name) queries the registrar for the address on name
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func (self *Registrar) NameToAddr(from common.Address, name string) (address common.Address, err error) { |
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nameHex, extra := encodeName(name, 2) |
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abi := resolveAbi + nameHex + extra |
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glog.V(logger.Detail).Infof("NameToAddr data: %s", abi) |
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res, _, err := self.backend.Call( |
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from.Hex(), |
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GlobalRegistrarAddr, |
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"", "", "", |
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abi, |
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) |
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if err != nil { |
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return |
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} |
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address = common.HexToAddress(res) |
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return |
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} |
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// called as first step in the registration process on HashReg
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func (self *Registrar) SetOwner(address common.Address) (txh string, err error) { |
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return self.backend.Transact( |
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address.Hex(), |
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HashRegAddr, |
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"", "", "", "", |
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setOwnerAbi, |
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) |
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} |
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|
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// registers some content hash to a key/code hash
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// e.g., the contract Info combined Json Doc's ContentHash
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// to CodeHash of a contract or hash of a domain
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func (self *Registrar) SetHashToHash(address common.Address, codehash, dochash common.Hash) (txh string, err error) { |
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_, err = self.SetOwner(address) |
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if err != nil { |
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return |
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} |
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codehex := common.Bytes2Hex(codehash[:]) |
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dochex := common.Bytes2Hex(dochash[:]) |
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data := registerContentHashAbi + codehex + dochex |
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glog.V(logger.Detail).Infof("SetHashToHash data: %s sent to %v\n", data, HashRegAddr) |
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return self.backend.Transact( |
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address.Hex(), |
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HashRegAddr, |
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"", "", "", "", |
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data, |
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) |
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} |
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|
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// SetUrlToHash(from, hash, url) registers a url to a content hash so that the content can be fetched
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// address is used as sender for the transaction and will be the owner of a new
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// registry entry on first time use
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// FIXME: silently doing nothing if sender is not the owner
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// note that with content addressed storage, this step is no longer necessary
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func (self *Registrar) SetUrlToHash(address common.Address, hash common.Hash, url string) (txh string, err error) { |
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hashHex := common.Bytes2Hex(hash[:]) |
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var urlHex string |
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urlb := []byte(url) |
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var cnt byte |
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n := len(urlb) |
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|
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for n > 0 { |
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if n > 32 { |
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n = 32 |
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} |
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urlHex = common.Bytes2Hex(urlb[:n]) |
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urlb = urlb[n:] |
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n = len(urlb) |
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bcnt := make([]byte, 32) |
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bcnt[31] = cnt |
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data := registerUrlAbi + |
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hashHex + |
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common.Bytes2Hex(bcnt) + |
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common.Bytes2Hex(common.Hex2BytesFixed(urlHex, 32)) |
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txh, err = self.backend.Transact( |
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address.Hex(), |
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UrlHintAddr, |
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"", "", "", "", |
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data, |
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) |
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if err != nil { |
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return |
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} |
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cnt++ |
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} |
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return |
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} |
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// HashToHash(key) resolves contenthash for key (a hash) using HashReg
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// resolution is costless non-transactional
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// implemented as direct retrieval from db
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func (self *Registrar) HashToHash(khash common.Hash) (chash common.Hash, err error) { |
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// look up in hashReg
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at := HashRegAddr[2:] |
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key := storageAddress(storageMapping(storageIdx2Addr(1), khash[:])) |
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hash := self.backend.StorageAt(at, key) |
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|
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if hash == "0x0" || len(hash) < 3 || (hash == common.Hash{}.Hex()) { |
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err = fmt.Errorf("content hash not found for '%v'", khash.Hex()) |
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return |
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} |
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copy(chash[:], common.Hex2BytesFixed(hash[2:], 32)) |
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return |
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} |
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|
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// HashToUrl(contenthash) resolves the url for contenthash using UrlHint
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// resolution is costless non-transactional
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// implemented as direct retrieval from db
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// if we use content addressed storage, this step is no longer necessary
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func (self *Registrar) HashToUrl(chash common.Hash) (uri string, err error) { |
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// look up in URL reg
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var str string = " " |
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var idx uint32 |
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for len(str) > 0 { |
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mapaddr := storageMapping(storageIdx2Addr(1), chash[:]) |
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key := storageAddress(storageFixedArray(mapaddr, storageIdx2Addr(idx))) |
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hex := self.backend.StorageAt(UrlHintAddr[2:], key) |
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str = string(common.Hex2Bytes(hex[2:])) |
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l := len(str) |
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for (l > 0) && (str[l-1] == 0) { |
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l-- |
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} |
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|
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str = str[:l] |
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uri = uri + str |
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idx++ |
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} |
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|
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l := 0 |
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for (l < len(uri)) && (uri[l] == 0) { |
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l++ |
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} |
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uri = uri[l:] |
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|
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if len(uri) == 0 { |
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err = fmt.Errorf("GetURLhint: URL hint not found for '%v'", chash.Hex()) |
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} |
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return |
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} |
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|
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func storageIdx2Addr(varidx uint32) []byte { |
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data := make([]byte, 32) |
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binary.BigEndian.PutUint32(data[28:32], varidx) |
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return data |
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} |
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|
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func storageMapping(addr, key []byte) []byte { |
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data := make([]byte, 64) |
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copy(data[0:32], key[0:32]) |
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copy(data[32:64], addr[0:32]) |
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sha := crypto.Sha3(data) |
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return sha |
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} |
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|
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func storageFixedArray(addr, idx []byte) []byte { |
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var carry byte |
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for i := 31; i >= 0; i-- { |
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var b byte = addr[i] + idx[i] + carry |
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if b < addr[i] { |
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carry = 1 |
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} else { |
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carry = 0 |
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} |
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addr[i] = b |
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} |
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return addr |
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} |
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|
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func storageAddress(addr []byte) string { |
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return common.ToHex(addr) |
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} |
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|
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func encodeAddress(address common.Address) string { |
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return addressAbiPrefix + address.Hex()[2:] |
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} |
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|
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func encodeName(name string, index uint8) (string, string) { |
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extra := common.Bytes2Hex([]byte(name)) |
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if len(name) > 32 { |
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return fmt.Sprintf("%064x", index), extra |
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} |
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return extra + falseHex[len(extra):], "" |
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} |
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@ -1,36 +0,0 @@ |
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package resolver |
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|
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const ( // built-in contracts address and code
|
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ContractCodeURLhint = "0x60c180600c6000396000f30060003560e060020a90048063300a3bbf14601557005b6024600435602435604435602a565b60006000f35b6000600084815260200190815260200160002054600160a060020a0316600014806078575033600160a060020a03166000600085815260200190815260200160002054600160a060020a0316145b607f5760bc565b336000600085815260200190815260200160002081905550806001600085815260200190815260200160002083610100811060b657005b01819055505b50505056" |
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/* |
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contract URLhint { |
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function register(uint256 _hash, uint8 idx, uint256 _url) { |
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if (owner[_hash] == 0 || owner[_hash] == msg.sender) { |
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owner[_hash] = msg.sender; |
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url[_hash][idx] = _url; |
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} |
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} |
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mapping (uint256 => address) owner; |
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mapping (uint256 => uint256[256]) url; |
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} |
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*/ |
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|
||||
ContractCodeHashReg = "0x609880600c6000396000f30060003560e060020a9004806331e12c2014601f578063d66d6c1014602b57005b6025603d565b60006000f35b6037600435602435605d565b60006000f35b600054600160a060020a0316600014605357605b565b336000819055505b565b600054600160a060020a031633600160a060020a031614607b576094565b8060016000848152602001908152602001600020819055505b505056" |
||||
/* |
||||
contract HashReg { |
||||
function setowner() { |
||||
if (owner == 0) { |
||||
owner = msg.sender; |
||||
} |
||||
} |
||||
function register(uint256 _key, uint256 _content) { |
||||
if (msg.sender == owner) { |
||||
content[_key] = _content; |
||||
} |
||||
} |
||||
address owner; |
||||
mapping (uint256 => uint256) content; |
||||
} |
||||
*/ |
||||
|
||||
) |
||||
@ -1,232 +0,0 @@ |
||||
package resolver |
||||
|
||||
import ( |
||||
"encoding/binary" |
||||
"fmt" |
||||
|
||||
"github.com/ethereum/go-ethereum/common" |
||||
"github.com/ethereum/go-ethereum/crypto" |
||||
"github.com/ethereum/go-ethereum/logger" |
||||
"github.com/ethereum/go-ethereum/logger/glog" |
||||
) |
||||
|
||||
/* |
||||
Resolver implements the Ethereum DNS mapping |
||||
HashReg : Key Hash (hash of domain name or contract code) -> Content Hash |
||||
UrlHint : Content Hash -> Url Hint |
||||
|
||||
The resolver is meant to be called by the roundtripper transport implementation |
||||
of a url scheme |
||||
*/ |
||||
|
||||
// // contract addresses will be hardcoded after they're created
|
||||
var UrlHintContractAddress, HashRegContractAddress string |
||||
|
||||
const ( |
||||
txValue = "0" |
||||
txGas = "100000" |
||||
txGasPrice = "1000000000000" |
||||
) |
||||
|
||||
func abi(s string) string { |
||||
return common.ToHex(crypto.Sha3([]byte(s))[:4]) |
||||
} |
||||
|
||||
var ( |
||||
registerContentHashAbi = abi("register(uint256,uint256)") |
||||
registerUrlAbi = abi("register(uint256,uint8,uint256)") |
||||
setOwnerAbi = abi("setowner()") |
||||
) |
||||
|
||||
type Backend interface { |
||||
StorageAt(string, string) string |
||||
Transact(fromStr, toStr, nonceStr, valueStr, gasStr, gasPriceStr, codeStr string) (string, error) |
||||
} |
||||
|
||||
type Resolver struct { |
||||
backend Backend |
||||
} |
||||
|
||||
func New(eth Backend) *Resolver { |
||||
return &Resolver{eth} |
||||
} |
||||
|
||||
// for testing and play temporarily
|
||||
// ideally the HashReg and UrlHint contracts should be in the genesis block
|
||||
// if we got build-in support for natspec/contract info
|
||||
// there should be only one of these officially endorsed
|
||||
// addresses as constants
|
||||
// TODO: could get around this with namereg, check
|
||||
func (self *Resolver) CreateContracts(addr common.Address) (err error) { |
||||
HashRegContractAddress, err = self.backend.Transact(addr.Hex(), "", "", txValue, txGas, txGasPrice, ContractCodeHashReg) |
||||
if err != nil { |
||||
return |
||||
} |
||||
UrlHintContractAddress, err = self.backend.Transact(addr.Hex(), "", "", txValue, txGas, txGasPrice, ContractCodeURLhint) |
||||
glog.V(logger.Detail).Infof("HashReg @ %v\nUrlHint @ %v\n", HashRegContractAddress, UrlHintContractAddress) |
||||
return |
||||
} |
||||
|
||||
// called as first step in the registration process on HashReg
|
||||
func (self *Resolver) SetOwner(address common.Address) (txh string, err error) { |
||||
return self.backend.Transact( |
||||
address.Hex(), |
||||
HashRegContractAddress, |
||||
"", txValue, txGas, txGasPrice, |
||||
setOwnerAbi, |
||||
) |
||||
} |
||||
|
||||
// registers some content hash to a key/code hash
|
||||
// e.g., the contract Info combined Json Doc's ContentHash
|
||||
// to CodeHash of a contract or hash of a domain
|
||||
// kept
|
||||
func (self *Resolver) RegisterContentHash(address common.Address, codehash, dochash common.Hash) (txh string, err error) { |
||||
_, err = self.SetOwner(address) |
||||
if err != nil { |
||||
return |
||||
} |
||||
codehex := common.Bytes2Hex(codehash[:]) |
||||
dochex := common.Bytes2Hex(dochash[:]) |
||||
|
||||
data := registerContentHashAbi + codehex + dochex |
||||
return self.backend.Transact( |
||||
address.Hex(), |
||||
HashRegContractAddress, |
||||
"", txValue, txGas, txGasPrice, |
||||
data, |
||||
) |
||||
} |
||||
|
||||
// registers a url to a content hash so that the content can be fetched
|
||||
// address is used as sender for the transaction and will be the owner of a new
|
||||
// registry entry on first time use
|
||||
// FIXME: silently doing nothing if sender is not the owner
|
||||
// note that with content addressed storage, this step is no longer necessary
|
||||
// it could be purely
|
||||
func (self *Resolver) RegisterUrl(address common.Address, hash common.Hash, url string) (txh string, err error) { |
||||
hashHex := common.Bytes2Hex(hash[:]) |
||||
var urlHex string |
||||
urlb := []byte(url) |
||||
var cnt byte |
||||
n := len(urlb) |
||||
|
||||
for n > 0 { |
||||
if n > 32 { |
||||
n = 32 |
||||
} |
||||
urlHex = common.Bytes2Hex(urlb[:n]) |
||||
urlb = urlb[n:] |
||||
n = len(urlb) |
||||
bcnt := make([]byte, 32) |
||||
bcnt[31] = cnt |
||||
data := registerUrlAbi + |
||||
hashHex + |
||||
common.Bytes2Hex(bcnt) + |
||||
common.Bytes2Hex(common.Hex2BytesFixed(urlHex, 32)) |
||||
txh, err = self.backend.Transact( |
||||
address.Hex(), |
||||
UrlHintContractAddress, |
||||
"", txValue, txGas, txGasPrice, |
||||
data, |
||||
) |
||||
if err != nil { |
||||
return |
||||
} |
||||
cnt++ |
||||
} |
||||
return |
||||
} |
||||
|
||||
func (self *Resolver) Register(address common.Address, codehash, dochash common.Hash, url string) (txh string, err error) { |
||||
|
||||
_, err = self.RegisterContentHash(address, codehash, dochash) |
||||
if err != nil { |
||||
return |
||||
} |
||||
return self.RegisterUrl(address, dochash, url) |
||||
} |
||||
|
||||
// resolution is costless non-transactional
|
||||
// implemented as direct retrieval from db
|
||||
func (self *Resolver) KeyToContentHash(khash common.Hash) (chash common.Hash, err error) { |
||||
// look up in hashReg
|
||||
at := common.Bytes2Hex(common.FromHex(HashRegContractAddress)) |
||||
key := storageAddress(storageMapping(storageIdx2Addr(1), khash[:])) |
||||
hash := self.backend.StorageAt(at, key) |
||||
|
||||
if hash == "0x0" || len(hash) < 3 { |
||||
err = fmt.Errorf("content hash not found for '%v'", khash.Hex()) |
||||
return |
||||
} |
||||
copy(chash[:], common.Hex2BytesFixed(hash[2:], 32)) |
||||
return |
||||
} |
||||
|
||||
// retrieves the url-hint for the content hash -
|
||||
// if we use content addressed storage, this step is no longer necessary
|
||||
func (self *Resolver) ContentHashToUrl(chash common.Hash) (uri string, err error) { |
||||
// look up in URL reg
|
||||
var str string = " " |
||||
var idx uint32 |
||||
for len(str) > 0 { |
||||
mapaddr := storageMapping(storageIdx2Addr(1), chash[:]) |
||||
key := storageAddress(storageFixedArray(mapaddr, storageIdx2Addr(idx))) |
||||
hex := self.backend.StorageAt(UrlHintContractAddress, key) |
||||
str = string(common.Hex2Bytes(hex[2:])) |
||||
l := len(str) |
||||
for (l > 0) && (str[l-1] == 0) { |
||||
l-- |
||||
} |
||||
str = str[:l] |
||||
uri = uri + str |
||||
idx++ |
||||
} |
||||
|
||||
if len(uri) == 0 { |
||||
err = fmt.Errorf("GetURLhint: URL hint not found for '%v'", chash.Hex()) |
||||
} |
||||
return |
||||
} |
||||
|
||||
func (self *Resolver) KeyToUrl(key common.Hash) (uri string, hash common.Hash, err error) { |
||||
// look up in urlHint
|
||||
hash, err = self.KeyToContentHash(key) |
||||
if err != nil { |
||||
return |
||||
} |
||||
uri, err = self.ContentHashToUrl(hash) |
||||
return |
||||
} |
||||
|
||||
func storageIdx2Addr(varidx uint32) []byte { |
||||
data := make([]byte, 32) |
||||
binary.BigEndian.PutUint32(data[28:32], varidx) |
||||
return data |
||||
} |
||||
|
||||
func storageMapping(addr, key []byte) []byte { |
||||
data := make([]byte, 64) |
||||
copy(data[0:32], key[0:32]) |
||||
copy(data[32:64], addr[0:32]) |
||||
sha := crypto.Sha3(data) |
||||
return sha |
||||
} |
||||
|
||||
func storageFixedArray(addr, idx []byte) []byte { |
||||
var carry byte |
||||
for i := 31; i >= 0; i-- { |
||||
var b byte = addr[i] + idx[i] + carry |
||||
if b < addr[i] { |
||||
carry = 1 |
||||
} else { |
||||
carry = 0 |
||||
} |
||||
addr[i] = b |
||||
} |
||||
return addr |
||||
} |
||||
|
||||
func storageAddress(addr []byte) string { |
||||
return common.ToHex(addr) |
||||
} |
||||
Loading…
Reference in new issue