add geth proxy

Author: lizekun

client.go

@@ -68,7 +68,7 @@ func (c *Client) call(module, action string, param map[string]interface{}, outco
 			err = fmt.Errorf("[ouch! panic recovered] please report this with what you did and what you expected, panic detail: %v", r)
 		}
 	}()
-
+	fmt.Println(c.craftURL(module, action, param))
 	req, err := http.NewRequest(http.MethodGet, c.craftURL(module, action, param), http.NoBody)
 	if err != nil {
 		err = wrapErr(err, "http.NewRequest")
@@ -129,8 +129,8 @@ func (c *Client) call(module, action string, param map[string]interface{}, outco
 		err = wrapErr(err, "json unmarshal envelope")
 		return
 	}
-	if envelope.Status != 1 {
-		err = fmt.Errorf("etherscan server: %s", envelope.Message)
+	if envelope.Error.Code != 0 {
+		err = fmt.Errorf("etherscan server: %s", envelope.Error.Message)
 		return
 	}
 

geth.go

@@ -0,0 +1,15 @@
+package etherscan
+
+import (
+	"strconv"
+)
+
+func (c *Client) GetBlockByNumber(blockNum int64) (block Block, err error) {
+	param := M{
+		"boolean": "true",
+		"tag":     strconv.FormatInt(blockNum, 16),
+	}
+
+	err = c.call("proxy", "eth_getBlockByNumber", param, &block)
+	return
+}

response.go

@@ -7,16 +7,57 @@
 
 package etherscan
 
-import "encoding/json"
+import (
+	"encoding/json"
+)
 
 // Envelope is the carrier of nearly every response
 type Envelope struct {
-	// 1 for good, 0 for error
-	Status int `json:"status,string"`
-	// OK for good, other words when Status equals 0
-	Message string `json:"message"`
-	// where response lies
 	Result json.RawMessage `json:"result"`
+	Error  struct {
+		Code    int    `json:"code"`
+		Message string `json:"message"`
+	}
+}
+
+type Transaction struct {
+	BlockHash        string `json:"blockHash"`
+	BlockNumber      string `json:"blockNumber"`
+	From             string `json:"from"`
+	Gas              string `json:"gas"`
+	GasPrice         string `json:"gasPrice"`
+	Hash             string `json:"hash"`
+	Input            string `json:"input"`
+	Nonce            string `json:"nonce"`
+	To               string `json:"to"`
+	TransactionIndex string `json:"transactionIndex"`
+	Value            string `json:"value"`
+	V                string `json:"v"`
+	R                string `json:"r"`
+	S                string `json:"s"`
+}
+
+type Block struct {
+	Difficulty       string        `json:"difficulty"`
+	ExtraData        string        `json:"extraData"`
+	GasLimit         string        `json:"gasLimit"`
+	GasUsed          string        `json:"gasUsed"`
+	Hash             string        `json:"hash"`
+	LogsBloom        string        `json:"logsBloom"`
+	Miner            string        `json:"miner"`
+	MixHash          string        `json:"mixHash"`
+	Nonce            string        `json:"nonce"`
+	Number           string        `json:"number"`
+	ParentHash       string        `json:"parentHash"`
+	ReceiptsRoot     string        `json:"receiptsRoot"`
+	Sha3Uncles       string        `json:"sha3Uncles"`
+	Size             string        `json:"size"`
+	StateRoot        string        `json:"stateRoot"`
+	Timestamp        string        `json:"timestamp"`
+	TotalDifficulty  string        `json:"totalDifficulty"`
+	Transactions     []Transaction `json:"transactions"`
+	TransactionsRoot string        `json:"transactionsRoot"`
+	Uncles           []interface{} `json:"uncles"`
 }
 
 // AccountBalance account and its balance in pair