1 files changed, 174 insertions, 0 deletions
diff --git a/plugin/evm/client.go b/plugin/evm/client.go
new file mode 100644
index 0000000..0817545
--- /dev/null
+++ b/plugin/evm/client.go
@@ -0,0 +1,174 @@
+// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package evm
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/ava-labs/avalanchego/api"
+	"github.com/ava-labs/avalanchego/ids"
+	"github.com/ava-labs/avalanchego/utils/formatting"
+	cjson "github.com/ava-labs/avalanchego/utils/json"
+	"github.com/ava-labs/avalanchego/utils/rpc"
+)
+
+// Client ...
+type Client struct {
+	requester rpc.EndpointRequester
+}
+
+// NewClient returns a Client for interacting with EVM [chain]
+func NewClient(uri, chain string, requestTimeout time.Duration) *Client {
+	return &Client{
+		requester: rpc.NewEndpointRequester(uri, fmt.Sprintf("/ext/bc/%s/avax", chain), "avax", requestTimeout),
+	}
+}
+
+// NewCChainClient returns a Client for interacting with the C Chain
+func NewCChainClient(uri string, requestTimeout time.Duration) *Client {
+	return NewClient(uri, "C", requestTimeout)
+}
+
+// IssueTx issues a transaction to a node and returns the TxID
+func (c *Client) IssueTx(txBytes []byte) (ids.ID, error) {
+	res := &api.JSONTxID{}
+	txStr, err := formatting.Encode(formatting.Hex, txBytes)
+	if err != nil {
+		return res.TxID, fmt.Errorf("problem hex encoding bytes: %w", err)
+	}
+	err = c.requester.SendRequest("issueTx", &api.FormattedTx{
+		Tx:       txStr,
+		Encoding: formatting.Hex,
+	}, res)
+	return res.TxID, err
+}
+
+// GetTxStatus returns the status of [txID]
+// func (c *Client) GetTxStatus(txID ids.ID) (choices.Status, error) {
+// 	res := &GetTxStatusReply{}
+// 	err := c.requester.SendRequest("getTxStatus", &api.JSONTxID{
+// 		TxID: txID,
+// 	}, res)
+// 	return res.Status, err
+// }
+
+// GetTx returns the byte representation of [txID]
+func (c *Client) GetTx(txID ids.ID) ([]byte, error) {
+	res := &api.FormattedTx{}
+	err := c.requester.SendRequest("getTx", &api.GetTxArgs{
+		TxID:     txID,
+		Encoding: formatting.Hex,
+	}, res)
+	if err != nil {
+		return nil, err
+	}
+
+	return formatting.Decode(formatting.Hex, res.Tx)
+}
+
+// GetUTXOs returns the byte representation of the UTXOs controlled by [addrs]
+func (c *Client) GetUTXOs(addrs []string, limit uint32, startAddress, startUTXOID string) ([][]byte, api.Index, error) {
+	res := &api.GetUTXOsReply{}
+	err := c.requester.SendRequest("getUTXOs", &api.GetUTXOsArgs{
+		Addresses: addrs,
+		Limit:     cjson.Uint32(limit),
+		StartIndex: api.Index{
+			Address: startAddress,
+			UTXO:    startUTXOID,
+		},
+		Encoding: formatting.Hex,
+	}, res)
+	if err != nil {
+		return nil, api.Index{}, err
+	}
+
+	utxos := make([][]byte, len(res.UTXOs))
+	for i, utxo := range res.UTXOs {
+		b, err := formatting.Decode(formatting.Hex, utxo)
+		if err != nil {
+			return nil, api.Index{}, err
+		}
+		utxos[i] = b
+	}
+	return utxos, res.EndIndex, nil
+}
+
+// CreateAddress creates a new address controlled by [user]
+func (c *Client) CreateAddress(user api.UserPass) (string, error) {
+	res := &api.JSONAddress{}
+	err := c.requester.SendRequest("createAddress", &user, res)
+	return res.Address, err
+}
+
+// ListAddresses returns all addresses on this chain controlled by [user]
+func (c *Client) ListAddresses(user api.UserPass) ([]string, error) {
+	res := &api.JSONAddresses{}
+	err := c.requester.SendRequest("listAddresses", &user, res)
+	return res.Addresses, err
+}
+
+// ExportKey returns the private key corresponding to [addr] controlled by [user]
+// in both Avalanche standard format and hex format
+func (c *Client) ExportKey(user api.UserPass, addr string) (string, string, error) {
+	res := &ExportKeyReply{}
+	err := c.requester.SendRequest("exportKey", &ExportKeyArgs{
+		UserPass: user,
+		Address:  addr,
+	}, res)
+	return res.PrivateKey, res.PrivateKeyHex, err
+}
+
+// ImportKey imports [privateKey] to [user]
+func (c *Client) ImportKey(user api.UserPass, privateKey string) (string, error) {
+	res := &api.JSONAddress{}
+	err := c.requester.SendRequest("importKey", &ImportKeyArgs{
+		UserPass:   user,
+		PrivateKey: privateKey,
+	}, res)
+	return res.Address, err
+}
+
+// Import sends an import transaction to import funds from [sourceChain] and
+// returns the ID of the newly created transaction
+func (c *Client) Import(user api.UserPass, to, sourceChain string) (ids.ID, error) {
+	res := &api.JSONTxID{}
+	err := c.requester.SendRequest("import", &ImportArgs{
+		UserPass:    user,
+		To:          to,
+		SourceChain: sourceChain,
+	}, res)
+	return res.TxID, err
+}
+
+// ExportAVAX sends AVAX from this chain to the address specified by [to].
+// Returns the ID of the newly created atomic transaction
+func (c *Client) ExportAVAX(
+	user api.UserPass,
+	amount uint64,
+	to string,
+) (ids.ID, error) {
+	return c.Export(user, amount, to, "AVAX")
+}
+
+// Export sends an asset from this chain to the P/C-Chain.
+// After this tx is accepted, the AVAX must be imported to the P/C-chain with an importTx.
+// Returns the ID of the newly created atomic transaction
+func (c *Client) Export(
+	user api.UserPass,
+	amount uint64,
+	to string,
+	assetID string,
+) (ids.ID, error) {
+	res := &api.JSONTxID{}
+	err := c.requester.SendRequest("export", &ExportArgs{
+		ExportAVAXArgs: ExportAVAXArgs{
+			UserPass: user,
+			Amount:   cjson.Uint64(amount),
+			To:       to,
+		},
+		AssetID: assetID,
+	}, res)
+	return res.TxID, err
+}