mobile: initial wrappers for mobile support

1 files changed, 202 insertions, 0 deletions

diff --git a/mobile/bind.go b/mobile/bind.go
new file mode 100644
index 000000000..79fb0e0e8
--- /dev/null
+++ b/mobile/bind.go
@@ -0,0 +1,202 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Contains all the wrappers from the bind package.
+
+package geth
+
+import (
+	"math/big"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/accounts/abi"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+// 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)
+}
+
+type signer struct {
+	sign bind.SignerFn
+}
+
+func (s *signer) Sign(addr *Address, tx *Transaction) (*Transaction, error) {
+	sig, err := s.sign(addr.address, tx.tx)
+	if err != nil {
+		return nil, err
+	}
+	return &Transaction{sig}, nil
+}
+
+// CallOpts is the collection of options to fine tune a contract call request.
+type CallOpts struct {
+	opts bind.CallOpts
+}
+
+// NewCallOpts creates a new option set for contract calls.
+func NewCallOpts() *CallOpts {
+	return new(CallOpts)
+}
+
+func (opts *CallOpts) IsPending() bool    { return opts.opts.Pending }
+func (opts *CallOpts) GetGasLimit() int64 { return 0 /* TODO(karalabe) */ }
+
+// GetContext cannot be reliably implemented without identity preservation (https://github.com/golang/go/issues/16876)
+// Even then it's awkward to unpack the subtleties of a Go context out to Java.
+// func (opts *CallOpts) GetContext() *Context { return &Context{opts.opts.Context} }
+
+func (opts *CallOpts) SetPending(pending bool)     { opts.opts.Pending = pending }
+func (opts *CallOpts) SetGasLimit(limit int64)     { /* TODO(karalabe) */ }
+func (opts *CallOpts) SetContext(context *Context) { opts.opts.Context = context.context }
+
+// TransactOpts is the collection of authorization data required to create a
+// valid Ethereum transaction.
+type TransactOpts struct {
+	opts bind.TransactOpts
+}
+
+func (opts *TransactOpts) GetFrom() *Address    { return &Address{opts.opts.From} }
+func (opts *TransactOpts) GetNonce() int64      { return opts.opts.Nonce.Int64() }
+func (opts *TransactOpts) GetValue() *BigInt    { return &BigInt{opts.opts.Value} }
+func (opts *TransactOpts) GetGasPrice() *BigInt { return &BigInt{opts.opts.GasPrice} }
+func (opts *TransactOpts) GetGasLimit() int64   { return opts.opts.GasLimit.Int64() }
+
+// GetSigner cannot be reliably implemented without identity preservation (https://github.com/golang/go/issues/16876)
+// func (opts *TransactOpts) GetSigner() Signer { return &signer{opts.opts.Signer} }
+
+// GetContext cannot be reliably implemented without identity preservation (https://github.com/golang/go/issues/16876)
+// Even then it's awkward to unpack the subtleties of a Go context out to Java.
+//func (opts *TransactOpts) GetContext() *Context { return &Context{opts.opts.Context} }
+
+func (opts *TransactOpts) SetFrom(from *Address) { opts.opts.From = from.address }
+func (opts *TransactOpts) SetNonce(nonce int64)  { opts.opts.Nonce = big.NewInt(nonce) }
+func (opts *TransactOpts) SetSigner(s Signer) {
+	opts.opts.Signer = func(addr common.Address, tx *types.Transaction) (*types.Transaction, error) {
+		sig, err := s.Sign(&Address{addr}, &Transaction{tx})
+		if err != nil {
+			return nil, err
+		}
+		return sig.tx, nil
+	}
+}
+func (opts *TransactOpts) SetValue(value *BigInt)      { opts.opts.Value = value.bigint }
+func (opts *TransactOpts) SetGasPrice(price *BigInt)   { opts.opts.GasPrice = price.bigint }
+func (opts *TransactOpts) SetGasLimit(limit int64)     { opts.opts.GasLimit = big.NewInt(limit) }
+func (opts *TransactOpts) SetContext(context *Context) { opts.opts.Context = context.context }
+
+// BoundContract is the base wrapper object that reflects a contract on the
+// Ethereum network. It contains a collection of methods that are used by the
+// higher level contract bindings to operate.
+type BoundContract struct {
+	contract *bind.BoundContract
+	address  common.Address
+	deployer *types.Transaction
+}
+
+// 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) {
+	// Convert all the deployment parameters to Go types
+	params := make([]interface{}, len(args.objects))
+	for i, obj := range args.objects {
+		params[i] = obj
+	}
+	// Deploy the contract to the network
+	parsed, err := abi.JSON(strings.NewReader(abiJSON))
+	if err != nil {
+		return nil, err
+	}
+	addr, tx, bound, err := bind.DeployContract(&opts.opts, parsed, bytecode, client.client, params...)
+	if err != nil {
+		return nil, err
+	}
+	return &BoundContract{
+		contract: bound,
+		address:  addr,
+		deployer: tx,
+	}, nil
+}
+
+// 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) {
+	parsed, err := abi.JSON(strings.NewReader(abiJSON))
+	if err != nil {
+		return nil, err
+	}
+	return &BoundContract{
+		contract: bind.NewBoundContract(address.address, parsed, client.client, client.client),
+		address:  address.address,
+	}, nil
+}
+
+func (c *BoundContract) GetAddress() *Address { return &Address{c.address} }
+func (c *BoundContract) GetDeployer() *Transaction {
+	if c.deployer == nil {
+		return nil
+	}
+	return &Transaction{c.deployer}
+}
+
+// Call invokes the (constant) contract method with params as input values and
+// sets the output to result.
+func (c *BoundContract) Call(opts *CallOpts, out *Interfaces, method string, args *Interfaces) error {
+	// Convert all the input and output parameters to Go types
+	params := make([]interface{}, len(args.objects))
+	for i, obj := range args.objects {
+		params[i] = obj
+	}
+	results := make([]interface{}, len(out.objects))
+	for i, obj := range out.objects {
+		results[i] = obj
+	}
+	// Execute the call to the contract and wrap any results
+	if err := c.contract.Call(&opts.opts, &results, method, params...); err != nil {
+		return err
+	}
+	for i, res := range results {
+		out.objects[i] = res
+	}
+	return nil
+}
+
+// Transact invokes the (paid) contract method with params as input values.
+func (c *BoundContract) Transact(opts *TransactOpts, method string, args *Interfaces) (*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)
+	if err != nil {
+		return nil, err
+	}
+	return &Transaction{tx}, 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)
+	if err != nil {
+		return nil, err
+	}
+	return &Transaction{tx}, nil
+}