mobile: iOS naming and API fixes for generators and Swift (#3408)

* build: modify the iOS namespace to iGeth (gomobile limitation)
* mobile: assign names to return types for ObjC wrapper
* mobile: use more expanded names for iOS/Swift API

15 files changed, 151 insertions, 147 deletions

diff --git a/build/ci.go b/build/ci.go
index c202480b2..c985e2da6 100644
--- a/build/ci.go
+++ b/build/ci.go
@@ -800,7 +800,7 @@ func doXCodeFramework(cmdline []string) {
 	// Build the iOS XCode framework
 	build.MustRun(goTool("get", "golang.org/x/mobile/cmd/gomobile"))
 	build.MustRun(gomobileTool("init"))
-	bind := gomobileTool("bind", "--target", "ios", "--tags", "ios", "--prefix", "GE", "-v", "github.com/ethereum/go-ethereum/mobile")
+	bind := gomobileTool("bind", "--target", "ios", "--tags", "ios", "--prefix", "i", "-v", "github.com/ethereum/go-ethereum/mobile")
 
 	if *local {
 		// If we're building locally, use the build folder and stop afterwards
diff --git a/mobile/accounts.go b/mobile/accounts.go
index 41498b6f0..9a2937b6d 100644
--- a/mobile/accounts.go
+++ b/mobile/accounts.go
@@ -56,7 +56,7 @@ func (a *Accounts) Size() int {
 }
 
 // Get returns the account at the given index from the slice.
-func (a *Accounts) Get(index int) (*Account, error) {
+func (a *Accounts) Get(index int) (account *Account, _ error) {
 	if index < 0 || index >= len(a.accounts) {
 		return nil, errors.New("index out of bounds")
 	}
@@ -91,8 +91,8 @@ func NewAccountManager(keydir string, scryptN, scryptP int) *AccountManager {
 }
 
 // HasAddress reports whether a key with the given address is present.
-func (am *AccountManager) HasAddress(addr *Address) bool {
-	return am.manager.HasAddress(addr.address)
+func (am *AccountManager) HasAddress(address *Address) bool {
+	return am.manager.HasAddress(address.address)
 }
 
 // GetAccounts returns all key files present in the directory.
@@ -102,32 +102,32 @@ func (am *AccountManager) GetAccounts() *Accounts {
 
 // DeleteAccount deletes the key matched by account if the passphrase is correct.
 // If a contains no filename, the address must match a unique key.
-func (am *AccountManager) DeleteAccount(a *Account, passphrase string) error {
+func (am *AccountManager) DeleteAccount(account *Account, passphrase string) error {
 	return am.manager.DeleteAccount(accounts.Account{
-		Address: a.account.Address,
-		File:    a.account.File,
+		Address: account.account.Address,
+		File:    account.account.File,
 	}, passphrase)
 }
 
 // Sign signs hash with an unlocked private key matching the given address.
-func (am *AccountManager) Sign(addr *Address, hash []byte) ([]byte, error) {
-	return am.manager.Sign(addr.address, hash)
+func (am *AccountManager) Sign(address *Address, hash []byte) (signature []byte, _ error) {
+	return am.manager.Sign(address.address, hash)
 }
 
 // SignWithPassphrase signs hash if the private key matching the given address can be
 // decrypted with the given passphrase.
-func (am *AccountManager) SignWithPassphrase(addr *Address, passphrase string, hash []byte) ([]byte, error) {
-	return am.manager.SignWithPassphrase(addr.address, passphrase, hash)
+func (am *AccountManager) SignWithPassphrase(address *Address, passphrase string, hash []byte) (signature []byte, _ error) {
+	return am.manager.SignWithPassphrase(address.address, passphrase, hash)
 }
 
 // Unlock unlocks the given account indefinitely.
-func (am *AccountManager) Unlock(a *Account, passphrase string) error {
-	return am.manager.TimedUnlock(a.account, passphrase, 0)
+func (am *AccountManager) Unlock(account *Account, passphrase string) error {
+	return am.manager.TimedUnlock(account.account, passphrase, 0)
 }
 
 // Lock removes the private key with the given address from memory.
-func (am *AccountManager) Lock(addr *Address) error {
-	return am.manager.Lock(addr.address)
+func (am *AccountManager) Lock(address *Address) error {
+	return am.manager.Lock(address.address)
 }
 
 // TimedUnlock unlocks the given account with the passphrase. The account
@@ -152,27 +152,27 @@ func (am *AccountManager) NewAccount(passphrase string) (*Account, error) {
 }
 
 // ExportKey exports as a JSON key, encrypted with newPassphrase.
-func (am *AccountManager) ExportKey(a *Account, passphrase, newPassphrase string) ([]byte, error) {
-	return am.manager.Export(a.account, passphrase, newPassphrase)
+func (am *AccountManager) ExportKey(account *Account, passphrase, newPassphrase string) (key []byte, _ error) {
+	return am.manager.Export(account.account, passphrase, newPassphrase)
 }
 
 // ImportKey stores the given encrypted JSON key into the key directory.
-func (am *AccountManager) ImportKey(keyJSON []byte, passphrase, newPassphrase string) (*Account, error) {
-	account, err := am.manager.Import(keyJSON, passphrase, newPassphrase)
+func (am *AccountManager) ImportKey(keyJSON []byte, passphrase, newPassphrase string) (account *Account, _ error) {
+	acc, err := am.manager.Import(keyJSON, passphrase, newPassphrase)
 	if err != nil {
 		return nil, err
 	}
-	return &Account{account}, nil
+	return &Account{acc}, nil
 }
 
 // Update changes the passphrase of an existing account.
-func (am *AccountManager) Update(a *Account, passphrase, newPassphrase string) error {
-	return am.manager.Update(a.account, passphrase, newPassphrase)
+func (am *AccountManager) Update(account *Account, passphrase, newPassphrase string) error {
+	return am.manager.Update(account.account, passphrase, newPassphrase)
 }
 
 // ImportPreSaleKey decrypts the given Ethereum presale wallet and stores
 // a key file in the key directory. The key file is encrypted with the same passphrase.
-func (am *AccountManager) ImportPreSaleKey(keyJSON []byte, passphrase string) (*Account, error) {
+func (am *AccountManager) ImportPreSaleKey(keyJSON []byte, passphrase string) (ccount *Account, _ error) {
 	account, err := am.manager.ImportPreSaleKey(keyJSON, passphrase)
 	if err != nil {
 		return nil, err
diff --git a/mobile/big.go b/mobile/big.go
index 6a358ba28..9a55836c1 100644
--- a/mobile/big.go
+++ b/mobile/big.go
@@ -78,7 +78,7 @@ func (bi *BigInts) Size() int {
 }
 
 // Get returns the bigint at the given index from the slice.
-func (bi *BigInts) Get(index int) (*BigInt, error) {
+func (bi *BigInts) Get(index int) (bigint *BigInt, _ error) {
 	if index < 0 || index >= len(bi.bigints) {
 		return nil, errors.New("index out of bounds")
 	}
diff --git a/mobile/bind.go b/mobile/bind.go
index 50adc6b0f..a25c37aca 100644
--- a/mobile/bind.go
+++ b/mobile/bind.go
@@ -31,15 +31,15 @@ import (
 // Signer is an interaface defining the callback when a contract requires a
 // method to sign the transaction before submission.
 type Signer interface {
-	Sign(*Address, *Transaction) (*Transaction, error)
+	Sign(*Address, *Transaction) (tx *Transaction, _ error)
 }
 
 type signer struct {
 	sign bind.SignerFn
 }
 
-func (s *signer) Sign(addr *Address, tx *Transaction) (*Transaction, error) {
-	sig, err := s.sign(types.HomesteadSigner{}, addr.address, tx.tx)
+func (s *signer) Sign(addr *Address, unsignedTx *Transaction) (signedTx *Transaction, _ error) {
+	sig, err := s.sign(types.HomesteadSigner{}, addr.address, unsignedTx.tx)
 	if err != nil {
 		return nil, err
 	}
@@ -113,7 +113,7 @@ type BoundContract struct {
 
 // DeployContract deploys a contract onto the Ethereum blockchain and binds the
 // deployment address with a wrapper.
-func DeployContract(opts *TransactOpts, abiJSON string, bytecode []byte, client *EthereumClient, args *Interfaces) (*BoundContract, error) {
+func DeployContract(opts *TransactOpts, abiJSON string, bytecode []byte, client *EthereumClient, args *Interfaces) (contract *BoundContract, _ error) {
 	// Convert all the deployment parameters to Go types
 	params := make([]interface{}, len(args.objects))
 	for i, obj := range args.objects {
@@ -137,7 +137,7 @@ func DeployContract(opts *TransactOpts, abiJSON string, bytecode []byte, client
 
 // BindContract creates a low level contract interface through which calls and
 // transactions may be made through.
-func BindContract(address *Address, abiJSON string, client *EthereumClient) (*BoundContract, error) {
+func BindContract(address *Address, abiJSON string, client *EthereumClient) (contract *BoundContract, _ error) {
 	parsed, err := abi.JSON(strings.NewReader(abiJSON))
 	if err != nil {
 		return nil, err
@@ -179,24 +179,24 @@ func (c *BoundContract) Call(opts *CallOpts, out *Interfaces, method string, arg
 }
 
 // Transact invokes the (paid) contract method with params as input values.
-func (c *BoundContract) Transact(opts *TransactOpts, method string, args *Interfaces) (*Transaction, error) {
+func (c *BoundContract) Transact(opts *TransactOpts, method string, args *Interfaces) (tx *Transaction, _ error) {
 	params := make([]interface{}, len(args.objects))
 	for i, obj := range args.objects {
 		params[i] = obj
 	}
-	tx, err := c.contract.Transact(&opts.opts, method, params)
+	rawTx, err := c.contract.Transact(&opts.opts, method, params)
 	if err != nil {
 		return nil, err
 	}
-	return &Transaction{tx}, nil
+	return &Transaction{rawTx}, nil
 }
 
 // Transfer initiates a plain transaction to move funds to the contract, calling
 // its default method if one is available.
-func (c *BoundContract) Transfer(opts *TransactOpts) (*Transaction, error) {
-	tx, err := c.contract.Transfer(&opts.opts)
+func (c *BoundContract) Transfer(opts *TransactOpts) (tx *Transaction, _ error) {
+	rawTx, err := c.contract.Transfer(&opts.opts)
 	if err != nil {
 		return nil, err
 	}
-	return &Transaction{tx}, nil
+	return &Transaction{rawTx}, nil
 }
diff --git a/mobile/common.go b/mobile/common.go
index ab1810bf1..779f22b4e 100644
--- a/mobile/common.go
+++ b/mobile/common.go
@@ -33,18 +33,18 @@ type Hash struct {
 }
 
 // NewHashFromBytes converts a slice of bytes to a hash value.
-func NewHashFromBytes(hash []byte) (*Hash, error) {
+func NewHashFromBytes(binary []byte) (hash *Hash, _ error) {
 	h := new(Hash)
-	if err := h.SetBytes(hash); err != nil {
+	if err := h.SetBytes(binary); err != nil {
 		return nil, err
 	}
 	return h, nil
 }
 
 // NewHashFromHex converts a hex string to a hash value.
-func NewHashFromHex(hash string) (*Hash, error) {
+func NewHashFromHex(hex string) (hash *Hash, _ error) {
 	h := new(Hash)
-	if err := h.SetHex(hash); err != nil {
+	if err := h.SetHex(hex); err != nil {
 		return nil, err
 	}
 	return h, nil
@@ -95,7 +95,7 @@ func (h *Hashes) Size() int {
 }
 
 // Get returns the hash at the given index from the slice.
-func (h *Hashes) Get(index int) (*Hash, error) {
+func (h *Hashes) Get(index int) (hash *Hash, _ error) {
 	if index < 0 || index >= len(h.hashes) {
 		return nil, errors.New("index out of bounds")
 	}
@@ -108,18 +108,18 @@ type Address struct {
 }
 
 // NewAddressFromBytes converts a slice of bytes to a hash value.
-func NewAddressFromBytes(address []byte) (*Address, error) {
+func NewAddressFromBytes(binary []byte) (address *Address, _ error) {
 	a := new(Address)
-	if err := a.SetBytes(address); err != nil {
+	if err := a.SetBytes(binary); err != nil {
 		return nil, err
 	}
 	return a, nil
 }
 
 // NewAddressFromHex converts a hex string to a address value.
-func NewAddressFromHex(address string) (*Address, error) {
+func NewAddressFromHex(hex string) (address *Address, _ error) {
 	a := new(Address)
-	if err := a.SetHex(address); err != nil {
+	if err := a.SetHex(hex); err != nil {
 		return nil, err
 	}
 	return a, nil
@@ -170,7 +170,7 @@ func (a *Addresses) Size() int {
 }
 
 // Get returns the address at the given index from the slice.
-func (a *Addresses) Get(index int) (*Address, error) {
+func (a *Addresses) Get(index int) (address *Address, _ error) {
 	if index < 0 || index >= len(a.addresses) {
 		return nil, errors.New("index out of bounds")
 	}
diff --git a/mobile/discover.go b/mobile/discover.go
index 9df2d04c3..9b3c93ccd 100644
--- a/mobile/discover.go
+++ b/mobile/discover.go
@@ -53,7 +53,7 @@ type Enode struct {
 // and UDP discovery port 30301.
 //
 //    enode://<hex node id>@10.3.58.6:30303?discport=30301
-func NewEnode(rawurl string) (*Enode, error) {
+func NewEnode(rawurl string) (enode *Enode, _ error) {
 	node, err := discv5.ParseNode(rawurl)
 	if err != nil {
 		return nil, err
@@ -82,7 +82,7 @@ func (e *Enodes) Size() int {
 }
 
 // Get returns the enode at the given index from the slice.
-func (e *Enodes) Get(index int) (*Enode, error) {
+func (e *Enodes) Get(index int) (enode *Enode, _ error) {
 	if index < 0 || index >= len(e.nodes) {
 		return nil, errors.New("index out of bounds")
 	}
diff --git a/mobile/doc.go b/mobile/doc.go
index 50cc7f4f8..89be470cc 100644
--- a/mobile/doc.go
+++ b/mobile/doc.go
@@ -51,6 +51,10 @@
 // should not be provided to limit the remote code complexity. Arrays should be
 // avoided as much as possible since they complicate bounds checking.
 //
+// If a method has multiple return values (e.g. some return + an error), those
+// are generated as output arguments in ObjC. To avoid weird generated names like
+// ret_0 for them, please always assign names to output variables if tuples.
+//
 // Note, a panic *cannot* cross over language boundaries, instead will result in
 // an undebuggable SEGFAULT in the process. For error handling only ever use error
 // returns, which may be the only or the second return.
diff --git a/mobile/ethclient.go b/mobile/ethclient.go
index a60fc2fa5..36a15aa47 100644
--- a/mobile/ethclient.go
+++ b/mobile/ethclient.go
@@ -32,80 +32,80 @@ type EthereumClient struct {
 }
 
 // NewEthereumClient connects a client to the given URL.
-func NewEthereumClient(rawurl string) (*EthereumClient, error) {
-	client, err := ethclient.Dial(rawurl)
-	return &EthereumClient{client}, err
+func NewEthereumClient(rawurl string) (client *EthereumClient, _ error) {
+	rawClient, err := ethclient.Dial(rawurl)
+	return &EthereumClient{rawClient}, err
 }
 
 // GetBlockByHash returns the given full block.
-func (ec *EthereumClient) GetBlockByHash(ctx *Context, hash *Hash) (*Block, error) {
-	block, err := ec.client.BlockByHash(ctx.context, hash.hash)
-	return &Block{block}, err
+func (ec *EthereumClient) GetBlockByHash(ctx *Context, hash *Hash) (block *Block, _ error) {
+	rawBlock, err := ec.client.BlockByHash(ctx.context, hash.hash)
+	return &Block{rawBlock}, err
 }
 
 // GetBlockByNumber returns a block from the current canonical chain. If number is <0, the
 // latest known block is returned.
-func (ec *EthereumClient) GetBlockByNumber(ctx *Context, number int64) (*Block, error) {
+func (ec *EthereumClient) GetBlockByNumber(ctx *Context, number int64) (block *Block, _ error) {
 	if number < 0 {
-		block, err := ec.client.BlockByNumber(ctx.context, nil)
-		return &Block{block}, err
+		rawBlock, err := ec.client.BlockByNumber(ctx.context, nil)
+		return &Block{rawBlock}, err
 	}
-	block, err := ec.client.BlockByNumber(ctx.context, big.NewInt(number))
-	return &Block{block}, err
+	rawBlock, err := ec.client.BlockByNumber(ctx.context, big.NewInt(number))
+	return &Block{rawBlock}, err
 }
 
 // GetHeaderByHash returns the block header with the given hash.
-func (ec *EthereumClient) GetHeaderByHash(ctx *Context, hash *Hash) (*Header, error) {
-	header, err := ec.client.HeaderByHash(ctx.context, hash.hash)
-	return &Header{header}, err
+func (ec *EthereumClient) GetHeaderByHash(ctx *Context, hash *Hash) (header *Header, _ error) {
+	rawHeader, err := ec.client.HeaderByHash(ctx.context, hash.hash)
+	return &Header{rawHeader}, err
 }
 
 // GetHeaderByNumber returns a block header from the current canonical chain. If number is <0,
 // the latest known header is returned.
-func (ec *EthereumClient) GetHeaderByNumber(ctx *Context, number int64) (*Header, error) {
+func (ec *EthereumClient) GetHeaderByNumber(ctx *Context, number int64) (header *Header, _ error) {
 	if number < 0 {
-		header, err := ec.client.HeaderByNumber(ctx.context, nil)
-		return &Header{header}, err
+		rawHeader, err := ec.client.HeaderByNumber(ctx.context, nil)
+		return &Header{rawHeader}, err
 	}
-	header, err := ec.client.HeaderByNumber(ctx.context, big.NewInt(number))
-	return &Header{header}, err
+	rawHeader, err := ec.client.HeaderByNumber(ctx.context, big.NewInt(number))
+	return &Header{rawHeader}, err
 }
 
 // GetTransactionByHash returns the transaction with the given hash.
-func (ec *EthereumClient) GetTransactionByHash(ctx *Context, hash *Hash) (*Transaction, error) {
+func (ec *EthereumClient) GetTransactionByHash(ctx *Context, hash *Hash) (tx *Transaction, _ error) {
 	// TODO(karalabe): handle isPending
-	tx, _, err := ec.client.TransactionByHash(ctx.context, hash.hash)
-	return &Transaction{tx}, err
+	rawTx, _, err := ec.client.TransactionByHash(ctx.context, hash.hash)
+	return &Transaction{rawTx}, err
 }
 
 // GetTransactionCount returns the total number of transactions in the given block.
-func (ec *EthereumClient) GetTransactionCount(ctx *Context, hash *Hash) (int, error) {
-	count, err := ec.client.TransactionCount(ctx.context, hash.hash)
-	return int(count), err
+func (ec *EthereumClient) GetTransactionCount(ctx *Context, hash *Hash) (count int, _ error) {
+	rawCount, err := ec.client.TransactionCount(ctx.context, hash.hash)
+	return int(rawCount), err
 }
 
 // GetTransactionInBlock returns a single transaction at index in the given block.
-func (ec *EthereumClient) GetTransactionInBlock(ctx *Context, hash *Hash, index int) (*Transaction, error) {
-	tx, err := ec.client.TransactionInBlock(ctx.context, hash.hash, uint(index))
-	return &Transaction{tx}, err
+func (ec *EthereumClient) GetTransactionInBlock(ctx *Context, hash *Hash, index int) (tx *Transaction, _ error) {
+	rawTx, err := ec.client.TransactionInBlock(ctx.context, hash.hash, uint(index))
+	return &Transaction{rawTx}, err
 
 }
 
 // GetTransactionReceipt returns the receipt of a transaction by transaction hash.
 // Note that the receipt is not available for pending transactions.
-func (ec *EthereumClient) GetTransactionReceipt(ctx *Context, hash *Hash) (*Receipt, error) {
-	receipt, err := ec.client.TransactionReceipt(ctx.context, hash.hash)
-	return &Receipt{receipt}, err
+func (ec *EthereumClient) GetTransactionReceipt(ctx *Context, hash *Hash) (receipt *Receipt, _ error) {
+	rawReceipt, err := ec.client.TransactionReceipt(ctx.context, hash.hash)
+	return &Receipt{rawReceipt}, err
 }
 
 // SyncProgress retrieves the current progress of the sync algorithm. If there's
 // no sync currently running, it returns nil.
-func (ec *EthereumClient) SyncProgress(ctx *Context) (*SyncProgress, error) {
-	progress, err := ec.client.SyncProgress(ctx.context)
-	if progress == nil {
+func (ec *EthereumClient) SyncProgress(ctx *Context) (progress *SyncProgress, _ error) {
+	rawProgress, err := ec.client.SyncProgress(ctx.context)
+	if rawProgress == nil {
 		return nil, err
 	}
-	return &SyncProgress{*progress}, err
+	return &SyncProgress{*rawProgress}, err
 }
 
 // NewHeadHandler is a client-side subscription callback to invoke on events and
@@ -117,10 +117,10 @@ type NewHeadHandler interface {
 
 // SubscribeNewHead subscribes to notifications about the current blockchain head
 // on the given channel.
-func (ec *EthereumClient) SubscribeNewHead(ctx *Context, handler NewHeadHandler, buffer int) (*Subscription, error) {
+func (ec *EthereumClient) SubscribeNewHead(ctx *Context, handler NewHeadHandler, buffer int) (sub *Subscription, _ error) {
 	// Subscribe to the event internally
 	ch := make(chan *types.Header, buffer)
-	sub, err := ec.client.SubscribeNewHead(ctx.context, ch)
+	rawSub, err := ec.client.SubscribeNewHead(ctx.context, ch)
 	if err != nil {
 		return nil, err
 	}
@@ -131,31 +131,31 @@ func (ec *EthereumClient) SubscribeNewHead(ctx *Context, handler NewHeadHandler,
 			case header := <-ch:
 				handler.OnNewHead(&Header{header})
 
-			case err := <-sub.Err():
+			case err := <-rawSub.Err():
 				handler.OnError(err.Error())
 				return
 			}
 		}
 	}()
-	return &Subscription{sub}, nil
+	return &Subscription{rawSub}, nil
 }
 
 // State Access
 
 // GetBalanceAt returns the wei balance of the given account.
 // The block number can be <0, in which case the balance is taken from the latest known block.
-func (ec *EthereumClient) GetBalanceAt(ctx *Context, account *Address, number int64) (*BigInt, error) {
+func (ec *EthereumClient) GetBalanceAt(ctx *Context, account *Address, number int64) (balance *BigInt, _ error) {
 	if number < 0 {
-		balance, err := ec.client.BalanceAt(ctx.context, account.address, nil)
-		return &BigInt{balance}, err
+		rawBalance, err := ec.client.BalanceAt(ctx.context, account.address, nil)
+		return &BigInt{rawBalance}, err
 	}
-	balance, err := ec.client.BalanceAt(ctx.context, account.address, big.NewInt(number))
-	return &BigInt{balance}, err
+	rawBalance, err := ec.client.BalanceAt(ctx.context, account.address, big.NewInt(number))
+	return &BigInt{rawBalance}, err
 }
 
 // GetStorageAt returns the value of key in the contract storage of the given account.
 // The block number can be <0, in which case the value is taken from the latest known block.
-func (ec *EthereumClient) GetStorageAt(ctx *Context, account *Address, key *Hash, number int64) ([]byte, error) {
+func (ec *EthereumClient) GetStorageAt(ctx *Context, account *Address, key *Hash, number int64) (storage []byte, _ error) {
 	if number < 0 {
 		return ec.client.StorageAt(ctx.context, account.address, key.hash, nil)
 	}
@@ -164,7 +164,7 @@ func (ec *EthereumClient) GetStorageAt(ctx *Context, account *Address, key *Hash
 
 // GetCodeAt returns the contract code of the given account.
 // The block number can be <0, in which case the code is taken from the latest known block.
-func (ec *EthereumClient) GetCodeAt(ctx *Context, account *Address, number int64) ([]byte, error) {
+func (ec *EthereumClient) GetCodeAt(ctx *Context, account *Address, number int64) (code []byte, _ error) {
 	if number < 0 {
 		return ec.client.CodeAt(ctx.context, account.address, nil)
 	}
@@ -173,26 +173,26 @@ func (ec *EthereumClient) GetCodeAt(ctx *Context, account *Address, number int64
 
 // GetNonceAt returns the account nonce of the given account.
 // The block number can be <0, in which case the nonce is taken from the latest known block.
-func (ec *EthereumClient) GetNonceAt(ctx *Context, account *Address, number int64) (int64, error) {
+func (ec *EthereumClient) GetNonceAt(ctx *Context, account *Address, number int64) (nonce int64, _ error) {
 	if number < 0 {
-		nonce, err := ec.client.NonceAt(ctx.context, account.address, nil)
-		return int64(nonce), err
+		rawNonce, err := ec.client.NonceAt(ctx.context, account.address, nil)
+		return int64(rawNonce), err
 	}
-	nonce, err := ec.client.NonceAt(ctx.context, account.address, big.NewInt(number))
-	return int64(nonce), err
+	rawNonce, err := ec.client.NonceAt(ctx.context, account.address, big.NewInt(number))
+	return int64(rawNonce), err
 }
 
 // Filters
 
 // FilterLogs executes a filter query.
-func (ec *EthereumClient) FilterLogs(ctx *Context, query *FilterQuery) (*Logs, error) {
-	logs, err := ec.client.FilterLogs(ctx.context, query.query)
+func (ec *EthereumClient) FilterLogs(ctx *Context, query *FilterQuery) (logs *Logs, _ error) {
+	rawLogs, err := ec.client.FilterLogs(ctx.context, query.query)
 	if err != nil {
 		return nil, err
 	}
 	// Temp hack due to vm.Logs being []*vm.Log
-	res := make(vm.Logs, len(logs))
-	for i, log := range logs {
+	res := make(vm.Logs, len(rawLogs))
+	for i, log := range rawLogs {
 		res[i] = &log
 	}
 	return &Logs{res}, nil
@@ -206,10 +206,10 @@ type FilterLogsHandler interface {
 }
 
 // SubscribeFilterLogs subscribes to the results of a streaming filter query.
-func (ec *EthereumClient) SubscribeFilterLogs(ctx *Context, query *FilterQuery, handler FilterLogsHandler, buffer int) (*Subscription, error) {
+func (ec *EthereumClient) SubscribeFilterLogs(ctx *Context, query *FilterQuery, handler FilterLogsHandler, buffer int) (sub *Subscription, _ error) {
 	// Subscribe to the event internally
 	ch := make(chan vm.Log, buffer)
-	sub, err := ec.client.SubscribeFilterLogs(ctx.context, query.query, ch)
+	rawSub, err := ec.client.SubscribeFilterLogs(ctx.context, query.query, ch)
 	if err != nil {
 		return nil, err
 	}
@@ -220,44 +220,44 @@ func (ec *EthereumClient) SubscribeFilterLogs(ctx *Context, query *FilterQuery,
 			case log := <-ch:
 				handler.OnFilterLogs(&Log{&log})
 
-			case err := <-sub.Err():
+			case err := <-rawSub.Err():
 				handler.OnError(err.Error())
 				return
 			}
 		}
 	}()
-	return &Subscription{sub}, nil
+	return &Subscription{rawSub}, nil
 }
 
 // Pending State
 
 // GetPendingBalanceAt returns the wei balance of the given account in the pending state.
-func (ec *EthereumClient) GetPendingBalanceAt(ctx *Context, account *Address) (*BigInt, error) {
-	balance, err := ec.client.PendingBalanceAt(ctx.context, account.address)
-	return &BigInt{balance}, err
+func (ec *EthereumClient) GetPendingBalanceAt(ctx *Context, account *Address) (balance *BigInt, _ error) {
+	rawBalance, err := ec.client.PendingBalanceAt(ctx.context, account.address)
+	return &BigInt{rawBalance}, err
 }
 
 // GetPendingStorageAt returns the value of key in the contract storage of the given account in the pending state.
-func (ec *EthereumClient) GetPendingStorageAt(ctx *Context, account *Address, key *Hash) ([]byte, error) {
+func (ec *EthereumClient) GetPendingStorageAt(ctx *Context, account *Address, key *Hash) (storage []byte, _ error) {
 	return ec.client.PendingStorageAt(ctx.context, account.address, key.hash)
 }
 
 // GetPendingCodeAt returns the contract code of the given account in the pending state.
-func (ec *EthereumClient) GetPendingCodeAt(ctx *Context, account *Address) ([]byte, error) {
+func (ec *EthereumClient) GetPendingCodeAt(ctx *Context, account *Address) (code []byte, _ error) {
 	return ec.client.PendingCodeAt(ctx.context, account.address)
 }
 
 // GetPendingNonceAt returns the account nonce of the given account in the pending state.
 // This is the nonce that should be used for the next transaction.
-func (ec *EthereumClient) GetPendingNonceAt(ctx *Context, account *Address) (int64, error) {
-	nonce, err := ec.client.PendingNonceAt(ctx.context, account.address)
-	return int64(nonce), err
+func (ec *EthereumClient) GetPendingNonceAt(ctx *Context, account *Address) (nonce int64, _ error) {
+	rawNonce, err := ec.client.PendingNonceAt(ctx.context, account.address)
+	return int64(rawNonce), err
 }
 
 // GetPendingTransactionCount returns the total number of transactions in the pending state.
-func (ec *EthereumClient) GetPendingTransactionCount(ctx *Context) (int, error) {
-	count, err := ec.client.PendingTransactionCount(ctx.context)
-	return int(count), err
+func (ec *EthereumClient) GetPendingTransactionCount(ctx *Context) (count int, _ error) {
+	rawCount, err := ec.client.PendingTransactionCount(ctx.context)
+	return int(rawCount), err
 }
 
 // Contract Calling
@@ -268,7 +268,7 @@ func (ec *EthereumClient) GetPendingTransactionCount(ctx *Context) (int, error)
 // blockNumber selects the block height at which the call runs. It can be <0, in which
 // case the code is taken from the latest known block. Note that state from very old
 // blocks might not be available.
-func (ec *EthereumClient) CallContract(ctx *Context, msg *CallMsg, number int64) ([]byte, error) {
+func (ec *EthereumClient) CallContract(ctx *Context, msg *CallMsg, number int64) (output []byte, _ error) {
 	if number < 0 {
 		return ec.client.CallContract(ctx.context, msg.msg, nil)
 	}
@@ -277,24 +277,24 @@ func (ec *EthereumClient) CallContract(ctx *Context, msg *CallMsg, number int64)
 
 // PendingCallContract executes a message call transaction using the EVM.
 // The state seen by the contract call is the pending state.
-func (ec *EthereumClient) PendingCallContract(ctx *Context, msg *CallMsg) ([]byte, error) {
+func (ec *EthereumClient) PendingCallContract(ctx *Context, msg *CallMsg) (output []byte, _ error) {
 	return ec.client.PendingCallContract(ctx.context, msg.msg)
 }
 
 // SuggestGasPrice retrieves the currently suggested gas price to allow a timely
 // execution of a transaction.
-func (ec *EthereumClient) SuggestGasPrice(ctx *Context) (*BigInt, error) {
-	price, err := ec.client.SuggestGasPrice(ctx.context)
-	return &BigInt{price}, err
+func (ec *EthereumClient) SuggestGasPrice(ctx *Context) (price *BigInt, _ error) {
+	rawPrice, err := ec.client.SuggestGasPrice(ctx.context)
+	return &BigInt{rawPrice}, err
 }
 
 // EstimateGas tries to estimate the gas needed to execute a specific transaction based on
 // the current pending state of the backend blockchain. There is no guarantee that this is
 // the true gas limit requirement as other transactions may be added or removed by miners,
 // but it should provide a basis for setting a reasonable default.
-func (ec *EthereumClient) EstimateGas(ctx *Context, msg *CallMsg) (*BigInt, error) {
-	price, err := ec.client.EstimateGas(ctx.context, msg.msg)
-	return &BigInt{price}, err
+func (ec *EthereumClient) EstimateGas(ctx *Context, msg *CallMsg) (gas *BigInt, _ error) {
+	rawGas, err := ec.client.EstimateGas(ctx.context, msg.msg)
+	return &BigInt{rawGas}, err
 }
 
 // SendTransaction injects a signed transaction into the pending pool for execution.
diff --git a/mobile/ethereum.go b/mobile/ethereum.go
index 6e8046ac9..94f707a87 100644
--- a/mobile/ethereum.go
+++ b/mobile/ethereum.go
@@ -93,7 +93,7 @@ func (t *Topics) Size() int {
 }
 
 // Get returns the topic list at the given index from the slice.
-func (t *Topics) Get(index int) (*Hashes, error) {
+func (t *Topics) Get(index int) (hashes *Hashes, _ error) {
 	if index < 0 || index >= len(t.topics) {
 		return nil, errors.New("index out of bounds")
 	}
diff --git a/mobile/geth.go b/mobile/geth.go
index 7ea4b2f65..af0054cdc 100644
--- a/mobile/geth.go
+++ b/mobile/geth.go
@@ -99,7 +99,7 @@ type Node struct {
 }
 
 // NewNode creates and configures a new Geth node.
-func NewNode(datadir string, config *NodeConfig) (*Node, error) {
+func NewNode(datadir string, config *NodeConfig) (stack *Node, _ error) {
 	// If no or partial configurations were specified, use defaults
 	if config == nil {
 		config = NewNodeConfig()
@@ -124,7 +124,7 @@ func NewNode(datadir string, config *NodeConfig) (*Node, error) {
 		NAT:              nat.Any(),
 		MaxPeers:         config.MaxPeers,
 	}
-	stack, err := node.New(nodeConf)
+	rawStack, err := node.New(nodeConf)
 	if err != nil {
 		return nil, err
 	}
@@ -153,14 +153,14 @@ func NewNode(datadir string, config *NodeConfig) (*Node, error) {
 			GpobaseStepUp:           100,
 			GpobaseCorrectionFactor: 110,
 		}
-		if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
+		if err := rawStack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
 			return les.New(ctx, ethConf)
 		}); err != nil {
 			return nil, fmt.Errorf("ethereum init: %v", err)
 		}
 		// If netstats reporting is requested, do it
 		if config.EthereumNetStats != "" {
-			if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
+			if err := rawStack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
 				var lesServ *les.LightEthereum
 				ctx.Service(&lesServ)
 
@@ -172,11 +172,11 @@ func NewNode(datadir string, config *NodeConfig) (*Node, error) {
 	}
 	// Register the Whisper protocol if requested
 	if config.WhisperEnabled {
-		if err := stack.Register(func(*node.ServiceContext) (node.Service, error) { return whisperv2.New(), nil }); err != nil {
+		if err := rawStack.Register(func(*node.ServiceContext) (node.Service, error) { return whisperv2.New(), nil }); err != nil {
 			return nil, fmt.Errorf("whisper init: %v", err)
 		}
 	}
-	return &Node{stack}, nil
+	return &Node{rawStack}, nil
 }
 
 // Start creates a live P2P node and starts running it.
@@ -191,7 +191,7 @@ func (n *Node) Stop() error {
 }
 
 // GetEthereumClient retrieves a client to access the Ethereum subsystem.
-func (n *Node) GetEthereumClient() (*EthereumClient, error) {
+func (n *Node) GetEthereumClient() (client *EthereumClient, _ error) {
 	rpc, err := n.node.Attach()
 	if err != nil {
 		return nil, err
diff --git a/mobile/interface.go b/mobile/interface.go
index b585b8642..10eac5f72 100644
--- a/mobile/interface.go
+++ b/mobile/interface.go
@@ -131,7 +131,7 @@ func (i *Interfaces) Size() int {
 }
 
 // Get returns the bigint at the given index from the slice.
-func (i *Interfaces) Get(index int) (*Interface, error) {
+func (i *Interfaces) Get(index int) (iface *Interface, _ error) {
 	if index < 0 || index >= len(i.objects) {
 		return nil, errors.New("index out of bounds")
 	}
diff --git a/mobile/p2p.go b/mobile/p2p.go
index 97ae626dc..e717d4004 100644
--- a/mobile/p2p.go
+++ b/mobile/p2p.go
@@ -66,7 +66,7 @@ func (pi *PeerInfos) Size() int {
 }
 
 // Get returns the peer info at the given index from the slice.
-func (pi *PeerInfos) Get(index int) (*PeerInfo, error) {
+func (pi *PeerInfos) Get(index int) (info *PeerInfo, _ error) {
 	if index < 0 || index >= len(pi.infos) {
 		return nil, errors.New("index out of bounds")
 	}
diff --git a/mobile/primitives.go b/mobile/primitives.go
index 28f402d4f..54b25df59 100644
--- a/mobile/primitives.go
+++ b/mobile/primitives.go
@@ -32,7 +32,7 @@ func (s *Strings) Size() int {
 }
 
 // Get returns the string at the given index from the slice.
-func (s *Strings) Get(index int) (string, error) {
+func (s *Strings) Get(index int) (str string, _ error) {
 	if index < 0 || index >= len(s.strs) {
 		return "", errors.New("index out of bounds")
 	}
diff --git a/mobile/types.go b/mobile/types.go
index bb5ccc625..9ea70ea9b 100644
--- a/mobile/types.go
+++ b/mobile/types.go
@@ -89,7 +89,7 @@ func (h *Headers) Size() int {
 }
 
 // Get returns the header at the given index from the slice.
-func (h *Headers) Get(index int) (*Header, error) {
+func (h *Headers) Get(index int) (header *Header, _ error) {
 	if index < 0 || index >= len(h.headers) {
 		return nil, errors.New("index out of bounds")
 	}
@@ -142,7 +142,7 @@ func (tx *Transaction) GetHash() *Hash    { return &Hash{tx.tx.Hash()} }
 func (tx *Transaction) GetSigHash() *Hash { return &Hash{tx.tx.SigHash(types.HomesteadSigner{})} }
 func (tx *Transaction) GetCost() *BigInt  { return &BigInt{tx.tx.Cost()} }
 
-func (tx *Transaction) GetFrom() (*Address, error) {
+func (tx *Transaction) GetFrom() (address *Address, _ error) {
 	from, err := types.Sender(types.HomesteadSigner{}, tx.tx)
 	return &Address{from}, err
 }
@@ -154,25 +154,25 @@ func (tx *Transaction) GetTo() *Address {
 	return nil
 }
 
-func (tx *Transaction) WithSignature(sig []byte) (*Transaction, error) {
-	t, err := tx.tx.WithSignature(types.HomesteadSigner{}, sig)
-	return &Transaction{t}, err
+func (tx *Transaction) WithSignature(sig []byte) (signedTx *Transaction, _ error) {
+	rawTx, err := tx.tx.WithSignature(types.HomesteadSigner{}, sig)
+	return &Transaction{rawTx}, err
 }
 
 // Transactions represents a slice of transactions.
 type Transactions struct{ txs types.Transactions }
 
 // Size returns the number of transactions in the slice.
-func (t *Transactions) Size() int {
-	return len(t.txs)
+func (txs *Transactions) Size() int {
+	return len(txs.txs)
 }
 
 // Get returns the transaction at the given index from the slice.
-func (t *Transactions) Get(index int) (*Transaction, error) {
-	if index < 0 || index >= len(t.txs) {
+func (txs *Transactions) Get(index int) (tx *Transaction, _ error) {
+	if index < 0 || index >= len(txs.txs) {
 		return nil, errors.New("index out of bounds")
 	}
-	return &Transaction{t.txs[index]}, nil
+	return &Transaction{txs.txs[index]}, nil
 }
 
 // Receipt represents the results of a transaction.
diff --git a/mobile/vm.go b/mobile/vm.go
index a68917ca6..cb098d390 100644
--- a/mobile/vm.go
+++ b/mobile/vm.go
@@ -48,7 +48,7 @@ func (l *Logs) Size() int {
 }
 
 // Get returns the log at the given index from the slice.
-func (l *Logs) Get(index int) (*Log, error) {
+func (l *Logs) Get(index int) (log *Log, _ error) {
 	if index < 0 || index >= len(l.logs) {
 		return nil, errors.New("index out of bounds")
 	}