feat: add loadwallet, unloadwallet and walletpassphrase (#13)

Signed-off-by: Julian Strobl <[email protected]>

README.md

@@ -70,6 +70,44 @@ Output:
 62eefd1ab286bd4c344f8806fc507d5effd26176e91add5afb7f4f6531cf543e
 ```
 
+### Wallet management
+```
+package main
+
+import (
+        "fmt"
+        "log"
+
+        elements "github.com/rddl-network/elements-rpc"
+)
+
+func main() {
+        url := "http://user:[email protected]:18891/wallet/foowallet"
+        loadWalletResult, err := elements.LoadWallet(url, []string{"foowallet", "true"})
+        if err != nil {
+                log.Fatal(err)
+        }
+        fmt.Printf("%+v\n", loadWalletResult)
+
+        // wallet was created with passphrase "foobar"
+        err = elements.Walletpassphrase(url, []string{"foobar", "60"})
+        if err != nil {
+                log.Fatal(err)
+        }
+
+        unloadWalletResult, err := elements.UnloadWallet(url, []string{"foowallet", "true"})
+        if err != nil {
+                log.Fatal(err)
+        }
+        fmt.Printf("%+v\n", unloadWalletResult)
+}
+```
+Output:
+```
+{Name:foowallet Warning:}
+{Warning:}
+```
+
 ### Complex Example
 
 ```

types/const.go

@@ -15,11 +15,14 @@ var (
 	MethodGetNewAddress                = "getnewaddress"
 	MethodGetRawTransaction            = "getrawtransaction"
 	MethodGetTransaction               = "gettransaction"
+	MethodLoadWallet                   = "loadwallet"
 	MethodRawIssueAsset                = "rawissueasset"
 	MethodReissueAsset                 = "reissueasset"
 	MethodSendRawTransaction           = "sendrawtransaction"
 	MethodSendToAddress                = "sendtoaddress"
 	MethodSignRawTransactionWithWallet = "signrawtransactionwithwallet"
 	MethodTestMempoolAccept            = "testmempoolaccept"
 	MethodDeriveAddresses              = "deriveaddresses"
+	MethodUnloadWallet                 = "unloadwallet"
+	MethodWalletpassphrase             = "walletpassphrase"
 )

types/wallet.go

@@ -53,6 +53,12 @@ type GetTransactionResult struct {
 	Hex             string                        `json:"hex"`
 }
 
+// LoadWalletResult models the result of the loadwallet command.
+type LoadWalletResult struct {
+	Name    string `json:"name"`
+	Warning string `json:"warning"`
+}
+
 // ReissueAssetResult models the result of a "reissueasset" transaction.
 type ReissueAssetResult struct {
 	TxID string `json:"txid"`
@@ -65,3 +71,8 @@ type SignRawTransactionWithWalletResult struct {
 	Hex      string `json:"hex"`
 	Complete bool   `json:"complete"`
 }
+
+// UnloadWalletResult models the result of the unloadwallet command.
+type UnloadWalletResult struct {
+	Warning string `json:"warning"`
+}

wallet.go

@@ -54,6 +54,19 @@ func GetTransaction(url string, params []string) (transactionResult types.GetTra
 	return
 }
 
+// LoadWallet loads a wallet from a wallet file or directory.
+func LoadWallet(url string, params []string) (loadWalletResult types.LoadWalletResult, err error) {
+	result, err := SendRequest(url, types.MethodLoadWallet, params)
+	if err != nil {
+		return
+	}
+	err = json.Unmarshal(result, &loadWalletResult)
+	if err != nil {
+		return
+	}
+	return
+}
+
 // ReissueAsset creates more of an already issued asset. Must have reissuance
 // token in wallet to do so.
 func ReissueAsset(url string, params []string) (transactionResult types.ReissueAssetResult, err error) {
@@ -95,3 +108,27 @@ func SignRawTransactionWithWallet(url string, params []string) (transactionResul
 	}
 	return
 }
+
+// UnloadWallet unloads the wallet referenced by the request endpoint otherwise
+// unloads the wallet specified in the argument.
+func UnloadWallet(url string, params []string) (unloadWalletResult types.UnloadWalletResult, err error) {
+	result, err := SendRequest(url, types.MethodUnloadWallet, params)
+	if err != nil {
+		return
+	}
+	err = json.Unmarshal(result, &unloadWalletResult)
+	if err != nil {
+		return
+	}
+	return
+}
+
+// Walletpassphrase stores the wallet decryption key in memory for 'timeout'
+// seconds.
+func Walletpassphrase(url string, params []string) (err error) {
+	_, err = SendRequest(url, types.MethodWalletpassphrase, params)
+	if err != nil {
+		return
+	}
+	return
+}