From ed0a3e4af5fa2b60e0b57cd0f4c2c01768a786e6 Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Thu, 28 May 2020 22:30:48 +0300
Subject: [PATCH] rpc/client: drop neoscan support

It was used as getunspents substitute and it's not longer relevant for NEO 3.
---
 pkg/rpc/client/client.go  |  32 ++++++++++
 pkg/rpc/client/neoscan.go | 125 --------------------------------------
 2 files changed, 32 insertions(+), 125 deletions(-)
 delete mode 100644 pkg/rpc/client/neoscan.go

diff --git a/pkg/rpc/client/client.go b/pkg/rpc/client/client.go
index d5ad26e7b..b22e5f07d 100644
--- a/pkg/rpc/client/client.go
+++ b/pkg/rpc/client/client.go
@@ -8,6 +8,7 @@ import (
 	"net"
 	"net/http"
 	"net/url"
+	"sort"
 	"sync"
 	"time"
 
@@ -227,3 +228,34 @@ func (c *Client) Ping() error {
 	_ = conn.Close()
 	return nil
 }
+
+// unspentsToInputs uses UnspentBalances to create a slice of inputs for a new
+// transcation containing the required amount of asset.
+func unspentsToInputs(utxos state.UnspentBalances, required util.Fixed8) ([]transaction.Input, util.Fixed8, error) {
+	var (
+		num, i   uint16
+		selected = util.Fixed8(0)
+	)
+	sort.Sort(utxos)
+
+	for _, us := range utxos {
+		if selected >= required {
+			break
+		}
+		selected += us.Value
+		num++
+	}
+	if selected < required {
+		return nil, util.Fixed8(0), errors.New("cannot compose inputs for transaction; check sender balance")
+	}
+
+	inputs := make([]transaction.Input, 0, num)
+	for i = 0; i < num; i++ {
+		inputs = append(inputs, transaction.Input{
+			PrevHash:  utxos[i].Tx,
+			PrevIndex: utxos[i].Index,
+		})
+	}
+
+	return inputs, selected, nil
+}
diff --git a/pkg/rpc/client/neoscan.go b/pkg/rpc/client/neoscan.go
deleted file mode 100644
index 011eb9c67..000000000
--- a/pkg/rpc/client/neoscan.go
+++ /dev/null
@@ -1,125 +0,0 @@
-package client
-
-import (
-	"encoding/json"
-	"errors"
-	"net/http"
-	"sort"
-
-	"github.com/nspcc-dev/neo-go/pkg/core/state"
-	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
-	"github.com/nspcc-dev/neo-go/pkg/rpc/response/result"
-	"github.com/nspcc-dev/neo-go/pkg/util"
-	errs "github.com/pkg/errors"
-)
-
-/*
-	Definition of types, helper functions and variables
-	required for calculation of transaction inputs using
-	NeoScan API.
-*/
-
-type (
-	// NeoScanServer stores NEOSCAN URL and API path.
-	NeoScanServer struct {
-		URL  string // "protocol://host:port/"
-		Path string // path to API endpoint without wallet address
-	}
-
-	// Unspent stores Unspents per asset
-	Unspent struct {
-		Unspent state.UnspentBalances
-		Asset   string      // "NEO" / "GAS"
-		Amount  util.Fixed8 // total unspent of this asset
-	}
-
-	// NeoScanBalance is a struct of NeoScan response to 'get_balance' request
-	NeoScanBalance struct {
-		Balance []*Unspent
-		Address string
-	}
-)
-
-// GetBalance performs a request to get balance for the address specified.
-func (s NeoScanServer) GetBalance(address string) ([]*Unspent, error) {
-	var (
-		err        error
-		req        *http.Request
-		res        *http.Response
-		balance    NeoScanBalance
-		client     = http.Client{}
-		balanceURL = s.URL + s.Path
-	)
-
-	if req, err = http.NewRequest(http.MethodGet, balanceURL+address, nil); err != nil {
-		return nil, errs.Wrap(err, "Failed to compose HTTP request")
-	}
-
-	if res, err = client.Do(req); err != nil {
-		return nil, errs.Wrap(err, "Failed to perform HTTP request")
-	}
-
-	defer res.Body.Close()
-
-	if err = json.NewDecoder(res.Body).Decode(&balance); err != nil {
-		return nil, errs.Wrap(err, "Failed to decode HTTP response")
-	}
-	return balance.Balance, nil
-}
-
-func filterSpecificAsset(asset string, balance []*Unspent, assetBalance *Unspent) {
-	for _, us := range balance {
-		if us.Asset == asset {
-			assetBalance.Unspent = us.Unspent
-			assetBalance.Asset = us.Asset
-			assetBalance.Amount = us.Amount
-			return
-		}
-	}
-}
-
-// CalculateInputs creates input transactions for the specified amount of given asset belonging to specified address.
-func (s NeoScanServer) CalculateInputs(address string, assetIDUint util.Uint256, cost util.Fixed8) ([]transaction.Input, util.Fixed8, error) {
-	var (
-		err          error
-		us           []*Unspent
-		assetUnspent Unspent
-		assetID      = result.GlobalAssets[assetIDUint.StringLE()]
-	)
-	if us, err = s.GetBalance(address); err != nil {
-		return nil, util.Fixed8(0), errs.Wrapf(err, "Cannot get balance for address %v", address)
-	}
-	filterSpecificAsset(assetID, us, &assetUnspent)
-	return unspentsToInputs(assetUnspent.Unspent, cost)
-}
-
-// unspentsToInputs uses UnspentBalances to create a slice of inputs for a new
-// transcation containing the required amount of asset.
-func unspentsToInputs(utxos state.UnspentBalances, required util.Fixed8) ([]transaction.Input, util.Fixed8, error) {
-	var (
-		num, i   uint16
-		selected = util.Fixed8(0)
-	)
-	sort.Sort(utxos)
-
-	for _, us := range utxos {
-		if selected >= required {
-			break
-		}
-		selected += us.Value
-		num++
-	}
-	if selected < required {
-		return nil, util.Fixed8(0), errors.New("cannot compose inputs for transaction; check sender balance")
-	}
-
-	inputs := make([]transaction.Input, 0, num)
-	for i = 0; i < num; i++ {
-		inputs = append(inputs, transaction.Input{
-			PrevHash:  utxos[i].Tx,
-			PrevIndex: utxos[i].Index,
-		})
-	}
-
-	return inputs, selected, nil
-}