update: (cic_net) add new methods and tests (#1)

* update: (cic_net) add new methods and tests

* add: write tx methods and tests

- add ci for testing
- coveralls for coverage

* ci: add test environment

* ci: expose secrets to env

* docs: add badges

.github/depandabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/go.yml

@@ -0,0 +1,27 @@
+name: Go
+
+on:
+  - push
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    environment: test
+    steps:
+      - uses: actions/setup-go@v3
+        with:
+          go-version: 1.18
+      - uses: actions/checkout@v2
+      - name: go test
+        env:
+          TOKEN_INDEX: ${{ secrets.TOKEN_INDEX }}
+          RPC_PROVIDER: ${{ secrets.RPC_PROVIDER }}
+          PRIVATE_KEY: ${{ secrets.PRIVATE_KEY }}
+        run: go test -v -covermode atomic -coverprofile=covprofile ./...
+      - name: install goveralls
+        run: go install github.com/mattn/goveralls@latest
+      - name: send coverage
+        env:
+          COVERALLS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: goveralls -coverprofile=covprofile -service=github

.gitignore

@@ -0,0 +1 @@
+covprofile

README.md

@@ -1,2 +1,11 @@
+[![Go Reference](https://pkg.go.dev/badge/github.com/grassrootseconomics/cic_go.svg)](https://pkg.go.dev/github.com/grassrootseconomics/cic_go)
+[![Go](https://github.com/grassrootseconomics/cic_go/actions/workflows/go.yml/badge.svg)](https://github.com/grassrootseconomics/cic_go/actions/workflows/go.yml)
+[![Coverage Status](https://coveralls.io/repos/github/grassrootseconomics/cic_go/badge.svg?branch=sohail/cic_net_updates)](https://coveralls.io/github/grassrootseconomics/cic_go?branch=sohail/cic_net_updates)
+
 # cic_go
 Go modules to access various parts of the cic stack
+
+## Implemented
+
+- cic_net
+- cic_meta

cic_net/cic_net.go

@@ -0,0 +1,48 @@
+package cic_net
+
+import (
+	"crypto/ecdsa"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/lmittmann/w3"
+	"math/big"
+)
+
+const (
+	kitabuMainnetChainId = 6060
+)
+
+type CicNet struct {
+	ethClient    *w3.Client
+	tokenIndex   common.Address
+	kitabuSigner types.Signer
+}
+
+type WriteTx struct {
+	from       common.Address
+	to         common.Address
+	gasLimit   uint64
+	privateKey ecdsa.PrivateKey
+}
+
+func NewCicNet(rpcEndpoint string, tokenIndex common.Address) (*CicNet, error) {
+	ethClient, err := w3.Dial(rpcEndpoint)
+	if err != nil {
+		return nil, err
+	}
+
+	return &CicNet{
+		ethClient:    ethClient,
+		tokenIndex:   tokenIndex,
+		kitabuSigner: types.NewEIP155Signer(big.NewInt(kitabuMainnetChainId)),
+	}, nil
+}
+
+func (c *CicNet) Close() error {
+	err := c.ethClient.Close()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

cic_net/cic_net_test.go

@@ -0,0 +1,32 @@
+package cic_net
+
+import (
+	"github.com/lmittmann/w3"
+	"os"
+	"testing"
+)
+
+type tConfig struct {
+	rpcProvider string
+	tokenIndex  string
+	privateKey  string
+}
+
+var conf = &tConfig{
+	rpcProvider: os.Getenv("RPC_PROVIDER"),
+	tokenIndex:  os.Getenv("TOKEN_INDEX"),
+	privateKey:  os.Getenv("PRIVATE_KEY"),
+}
+
+func TestCicNet_Connect(t *testing.T) {
+	name := "Test RPC connection"
+	wantErr := false
+
+	t.Run(name, func(t *testing.T) {
+		cicnet, _ := NewCicNet(conf.rpcProvider, w3.A(conf.tokenIndex))
+
+		if err := cicnet.Close(); (err != nil) != wantErr {
+			t.Errorf("EntryCount() error = %v, wantErr %v", err, wantErr)
+		}
+	})
+}

cic_net/cicnet.go

@@ -1,32 +0,0 @@
-package cic_net
-
-import (
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/lmittmann/w3"
-)
-
-type CicNet struct {
-	ethClient  *w3.Client
-	tokenIndex common.Address
-}
-
-func NewCicNet(rpcEndpoint string, tokenIndex common.Address) (*CicNet, error) {
-	ethClient, err := w3.Dial(rpcEndpoint)
-	if err != nil {
-		return nil, err
-	}
-
-	return &CicNet{
-		ethClient:  ethClient,
-		tokenIndex: tokenIndex,
-	}, nil
-}
-
-func (c *CicNet) Close() error {
-	err := c.ethClient.Close()
-	if err != nil {
-		return err
-	}
-
-	return nil
-}

cic_net/erc20_demurrage_token.go

@@ -8,32 +8,102 @@ import (
 	"math/big"
 )
 
-type DemurrageToken struct {
-	Name     string
-	Symbol   string
-	Decimals big.Int
+type DemurrageTokenInfo struct {
+	DemurrageAmount         big.Int
+	DemurrageTimestamp      big.Int
+	MinimumParticipantSpend big.Int
+	ResolutionFactor        big.Int
+	PeriodStart             big.Int
+	PeriodDuration          big.Int
+	TaxLevel                big.Int
+	ActualPeriod            big.Int
+	RedistributionCount     big.Int
+	IsDemurrageToken        bool
 }
 
-func (c *CicNet) TokenInfo(ctx context.Context, tokenAddress common.Address) (DemurrageToken, error) {
+func (c *CicNet) DemurrageTokenInfo(ctx context.Context, tokenAddress common.Address) (DemurrageTokenInfo, error) {
 	var (
-		tokenName     string
-		tokenSymbol   string
-		tokenDecimals big.Int
+		demurrageAmount         big.Int
+		demurrageTimestamp      big.Int
+		minimumParticipantSpend big.Int
+		resolutionFactor        big.Int
+		periodStart             big.Int
+		periodDuration          big.Int
+		taxLevel                big.Int
+		actualPeriod            big.Int
+		redistributionCount     big.Int
 	)
 
 	err := c.ethClient.CallCtx(
 		ctx,
-		eth.CallFunc(w3.MustNewFunc("name()", "string"), tokenAddress).Returns(&tokenName),
-		eth.CallFunc(w3.MustNewFunc("symbol()", "string"), tokenAddress).Returns(&tokenSymbol),
-		eth.CallFunc(w3.MustNewFunc("decimals()", "uint256"), tokenAddress).Returns(&tokenDecimals),
+		eth.CallFunc(w3.MustNewFunc("demurrageAmount()", "uint128"), tokenAddress).Returns(&demurrageAmount),
+		eth.CallFunc(w3.MustNewFunc("demurrageTimestamp()", "uint256"), tokenAddress).Returns(&demurrageTimestamp),
+		eth.CallFunc(w3.MustNewFunc("minimumParticipantSpend()", "uint256"), tokenAddress).Returns(&minimumParticipantSpend),
+		eth.CallFunc(w3.MustNewFunc("resolutionFactor()", "uint256"), tokenAddress).Returns(&resolutionFactor),
+		eth.CallFunc(w3.MustNewFunc("periodStart()", "uint256"), tokenAddress).Returns(&periodStart),
+		eth.CallFunc(w3.MustNewFunc("periodDuration()", "uint256"), tokenAddress).Returns(&periodDuration),
+		eth.CallFunc(w3.MustNewFunc("taxLevel()", "uint256"), tokenAddress).Returns(&taxLevel),
+		eth.CallFunc(w3.MustNewFunc("actualPeriod()", "uint256"), tokenAddress).Returns(&actualPeriod),
+		eth.CallFunc(w3.MustNewFunc("redistributionCount()", "uint256"), tokenAddress).Returns(&redistributionCount),
 	)
+
 	if err != nil {
-		return DemurrageToken{}, err
+		return DemurrageTokenInfo{}, err
 	}
 
-	return DemurrageToken{
-		Name:     tokenName,
-		Symbol:   tokenSymbol,
-		Decimals: tokenDecimals,
+	return DemurrageTokenInfo{
+		DemurrageAmount:         demurrageAmount,
+		DemurrageTimestamp:      demurrageTimestamp,
+		MinimumParticipantSpend: minimumParticipantSpend,
+		ResolutionFactor:        resolutionFactor,
+		PeriodStart:             periodStart,
+		PeriodDuration:          periodDuration,
+		TaxLevel:                taxLevel,
+		ActualPeriod:            actualPeriod,
+		RedistributionCount:     redistributionCount,
 	}, nil
 }
+
+func (c *CicNet) BaseBalanceOf(ctx context.Context, tokenAddress common.Address, accountAddress common.Address) (big.Int, error) {
+	var balance big.Int
+
+	err := c.ethClient.CallCtx(
+		ctx,
+		eth.CallFunc(w3.MustNewFunc("baseBalanceOf(address _account)", "uint256"), tokenAddress, accountAddress).Returns(&balance),
+	)
+	if err != nil {
+		return big.Int{}, err
+	}
+
+	return balance, nil
+}
+
+func (c *CicNet) ChangePeriod(ctx context.Context, txData WriteTx) (common.Hash, error) {
+	sig := w3.MustNewFunc("changePeriod()", "bool")
+	input, err := sig.EncodeArgs()
+	if err != nil {
+		return [32]byte{}, err
+	}
+
+	txHash, err := c.signAndCall(ctx, input, txData)
+	if err != nil {
+		return [32]byte{}, err
+	}
+
+	return txHash, nil
+}
+
+func (c *CicNet) ApplyDemurrageLimited(ctx context.Context, rounds int64, txData WriteTx) (common.Hash, error) {
+	sig := w3.MustNewFunc("applyDemurrageLimited(uint256 _rounds)", "bool")
+	input, err := sig.EncodeArgs(big.NewInt(rounds))
+	if err != nil {
+		return [32]byte{}, err
+	}
+
+	txHash, err := c.signAndCall(ctx, input, txData)
+	if err != nil {
+		return [32]byte{}, err
+	}
+
+	return txHash, nil
+}

cic_net/erc20_demurrage_token_test.go

@@ -0,0 +1,251 @@
+package cic_net
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/lmittmann/w3"
+	"math/big"
+	"testing"
+)
+
+func TestCicNet_DemurrageToken_DemurrageTokeInfo(t *testing.T) {
+	type args struct {
+		contractAddress common.Address
+	}
+
+	tests := []struct {
+		name        string
+		args        args
+		wantErr     bool
+		isDemurrage bool
+	}{
+		{
+			name: "Demurrage token at kitabu sarafu",
+			args: args{
+				contractAddress: w3.A("0xaB89822F31c2092861F713F6F34bd6877a8C1878"),
+			},
+			wantErr: false,
+		},
+		{
+			name: "Giftable token at Muthaa",
+			args: args{
+				contractAddress: w3.A("0x3dad47e5EF13661bbD15aa74132E91a9aBCFDe44"),
+			},
+			wantErr: true,
+		},
+		{
+			name: "Dead address",
+			args: args{
+				contractAddress: w3.A("0x000000000000000000000000000000000000dEaD"),
+			},
+			wantErr: true,
+		},
+	}
+
+	for _, testcase := range tests {
+		tt := testcase
+
+		t.Run(tt.name, func(t *testing.T) {
+			cicnet, err := NewCicNet(conf.rpcProvider, w3.A(conf.tokenIndex))
+
+			if err != nil {
+				t.Fatalf("NewCicNet error = %v", err)
+			}
+
+			got, err := cicnet.DemurrageTokenInfo(context.Background(), tt.args.contractAddress)
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("DemurrageTokenInfo() error = %v, wantErr %v", err, tt.wantErr)
+			}
+
+			if !tt.wantErr {
+				if got.DemurrageAmount.Cmp(big.NewInt(0)) < 1 {
+					t.Fatalf("DemurrageAmount = %v, want %d atleast", got, 1)
+				}
+			}
+		})
+	}
+}
+
+func TestCicNet_DemurrageToken_BaseBalanceOf(t *testing.T) {
+	type args struct {
+		contractAddress common.Address
+		accountAddress  common.Address
+	}
+
+	tests := []struct {
+		name       string
+		args       args
+		wantErr    bool
+		balanceGte big.Int
+	}{
+		{
+			name: "Sarafu sink balance",
+			args: args{
+				contractAddress: w3.A("0xaB89822F31c2092861F713F6F34bd6877a8C1878"),
+				accountAddress:  w3.A("0xBBb4a93c8dCd82465B73A143f00FeD4AF7492a27"),
+			},
+			wantErr:    false,
+			balanceGte: *big.NewInt(1),
+		},
+		{
+			name: "Dead address balance",
+			args: args{
+				contractAddress: w3.A("0xaB89822F31c2092861F713F6F34bd6877a8C1878"),
+				accountAddress:  w3.A("0x000000000000000000000000000000000000dEaD"),
+			},
+			wantErr:    false,
+			balanceGte: *big.NewInt(0),
+		},
+		{
+			name: "Giftable token at Muthaa",
+			args: args{
+				contractAddress: w3.A("0x3dad47e5EF13661bbD15aa74132E91a9aBCFDe44"),
+				accountAddress:  w3.A("0xBBb4a93c8dCd82465B73A143f00FeD4AF7492a27"),
+			},
+			wantErr: true,
+		},
+	}
+
+	for _, testcase := range tests {
+		tt := testcase
+
+		t.Run(tt.name, func(t *testing.T) {
+			cicnet, err := NewCicNet(conf.rpcProvider, w3.A(conf.tokenIndex))
+
+			if err != nil {
+				t.Fatalf("NewCicNet error = %v", err)
+			}
+
+			got, err := cicnet.BaseBalanceOf(context.Background(), tt.args.contractAddress, tt.args.accountAddress)
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("BaseBalanceOf() error = %v, wantErr %v", err, tt.wantErr)
+			}
+
+			if !tt.wantErr {
+				if got.Cmp(&tt.balanceGte) < 0 {
+					t.Fatalf("Token = %v, want %d", got, tt.balanceGte.Int64())
+				}
+			}
+		})
+	}
+}
+
+func TestCicNet_DemurrageToken_ChangePeriod(t *testing.T) {
+	type args struct {
+		writeTx WriteTx
+	}
+
+	// Bootstrap signer
+	privateKey, err := crypto.HexToECDSA(conf.privateKey)
+	if err != nil {
+		t.Fatalf("ECDSA error = %v", err)
+	}
+	publicKey := privateKey.Public()
+	publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
+	if !ok {
+		t.Fatalf("ECDSA error = %v", err)
+	}
+	fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)
+
+	tests := []struct {
+		name       string
+		args       args
+		wantErr    bool
+		balanceGte big.Int
+	}{
+		{
+			name: "ChangePeriod for Sarafu",
+			args: args{
+				writeTx: WriteTx{
+					from:       fromAddress,
+					to:         w3.A("0xaB89822F31c2092861F713F6F34bd6877a8C1878"),
+					gasLimit:   12000000,
+					privateKey: *privateKey,
+				},
+			},
+			wantErr: false,
+		},
+	}
+
+	for _, testcase := range tests {
+		tt := testcase
+
+		t.Run(tt.name, func(t *testing.T) {
+			cicnet, err := NewCicNet(conf.rpcProvider, w3.A(conf.tokenIndex))
+
+			if err != nil {
+				t.Fatalf("NewCicNet error = %v", err)
+			}
+
+			tx, err := cicnet.ChangePeriod(context.Background(), tt.args.writeTx)
+			t.Logf("ChangePeriod tx_hash %s", tx.String())
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ChangePeriod() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}
+
+func TestCicNet_DemurrageToken_ApplyDemurrageLimited(t *testing.T) {
+	type args struct {
+		rounds  int64
+		writeTx WriteTx
+	}
+
+	// Bootstrap signer
+	privateKey, err := crypto.HexToECDSA(conf.privateKey)
+	if err != nil {
+		t.Fatalf("ECDSA error = %v", err)
+	}
+	publicKey := privateKey.Public()
+	publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
+	if !ok {
+		t.Fatalf("ECDSA error = %v", err)
+	}
+	fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)
+
+	tests := []struct {
+		name       string
+		args       args
+		wantErr    bool
+		balanceGte big.Int
+	}{
+		{
+			name: "ChangePeriod for Sarafu",
+			args: args{
+				rounds: 1000,
+				writeTx: WriteTx{
+					from:       fromAddress,
+					to:         w3.A("0xaB89822F31c2092861F713F6F34bd6877a8C1878"),
+					gasLimit:   12000000,
+					privateKey: *privateKey,
+				},
+			},
+			wantErr: false,
+		},
+	}
+
+	for _, testcase := range tests {
+		tt := testcase
+
+		t.Run(tt.name, func(t *testing.T) {
+			cicnet, err := NewCicNet(conf.rpcProvider, w3.A(conf.tokenIndex))
+
+			if err != nil {
+				t.Fatalf("NewCicNet error = %v", err)
+			}
+
+			tx, err := cicnet.ApplyDemurrageLimited(context.Background(), tt.args.rounds, tt.args.writeTx)
+			t.Logf("ApplyDemurrageLimited tx_hash %s", tx.String())
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ApplyDemurrageLimited() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}

cic_net/erc20_token.go

@@ -0,0 +1,52 @@
+package cic_net
+
+import (
+	"context"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/lmittmann/w3"
+	"github.com/lmittmann/w3/module/eth"
+	"math/big"
+)
+
+type ERC20Token struct {
+	Name     string
+	Symbol   string
+	Decimals big.Int
+}
+
+func (c *CicNet) ERC20TokenInfo(ctx context.Context, tokenAddress common.Address) (ERC20Token, error) {
+	var (
+		tokenName     string
+		tokenSymbol   string
+		tokenDecimals big.Int
+	)
+
+	err := c.ethClient.CallCtx(
+		ctx,
+		eth.CallFunc(w3.MustNewFunc("name()", "string"), tokenAddress).Returns(&tokenName),
+		eth.CallFunc(w3.MustNewFunc("symbol()", "string"), tokenAddress).Returns(&tokenSymbol),
+		eth.CallFunc(w3.MustNewFunc("decimals()", "uint256"), tokenAddress).Returns(&tokenDecimals),
+	)
+	if err != nil {
+		return ERC20Token{}, err
+	}
+
+	return ERC20Token{
+		Name:     tokenName,
+		Symbol:   tokenSymbol,
+		Decimals: tokenDecimals,
+	}, nil
+}
+func (c *CicNet) BalanceOf(ctx context.Context, tokenAddress common.Address, accountAddress common.Address) (big.Int, error) {
+	var balance big.Int
+
+	err := c.ethClient.CallCtx(
+		ctx,
+		eth.CallFunc(w3.MustNewFunc("balanceOf(address _account)", "uint256"), tokenAddress, accountAddress).Returns(&balance),
+	)
+	if err != nil {
+		return big.Int{}, err
+	}
+
+	return balance, nil
+}

cic_net/erc20_token_test.go

@@ -0,0 +1,116 @@
+package cic_net
+
+import (
+	"context"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/lmittmann/w3"
+	"math/big"
+	"testing"
+)
+
+func TestCicNet_ERC20Token_ERC20TokenInfo(t *testing.T) {
+	type args struct {
+		contractAddress common.Address
+	}
+
+	tests := []struct {
+		name    string
+		args    args
+		wantErr bool
+		symbol  string
+	}{
+		{
+			name: "Token at kitabu sarafu",
+			args: args{
+				contractAddress: w3.A("0xaB89822F31c2092861F713F6F34bd6877a8C1878"),
+			},
+			wantErr: false,
+			symbol:  "SRF",
+		},
+		{
+			name: "Token at zero address",
+			args: args{
+				contractAddress: w3.A("0x0000000000000000000000000000000000000000"),
+			},
+			wantErr: true,
+			symbol:  "",
+		},
+	}
+
+	for _, testcase := range tests {
+		tt := testcase
+
+		t.Run(tt.name, func(t *testing.T) {
+			cicnet, err := NewCicNet(conf.rpcProvider, w3.A(conf.tokenIndex))
+
+			if err != nil {
+				t.Fatalf("NewCicNet error = %v", err)
+			}
+
+			got, err := cicnet.ERC20TokenInfo(context.Background(), tt.args.contractAddress)
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ERC20TokenInfo() error = %v, wantErr %v", err, tt.wantErr)
+			}
+
+			if got.Symbol != tt.symbol {
+				t.Fatalf("Token = %v, want %v", got, tt.symbol)
+			}
+		})
+	}
+}
+
+func TestCicNet_ERC20Token_BalanceOf(t *testing.T) {
+	type args struct {
+		contractAddress common.Address
+		accountAddress  common.Address
+	}
+
+	tests := []struct {
+		name       string
+		args       args
+		wantErr    bool
+		balanceGte big.Int
+	}{
+		{
+			name: "Sarafu sink balance",
+			args: args{
+				contractAddress: w3.A("0xaB89822F31c2092861F713F6F34bd6877a8C1878"),
+				accountAddress:  w3.A("0xBBb4a93c8dCd82465B73A143f00FeD4AF7492a27"),
+			},
+			wantErr:    false,
+			balanceGte: *big.NewInt(1),
+		},
+		{
+			name: "Dead address balance",
+			args: args{
+				contractAddress: w3.A("0xaB89822F31c2092861F713F6F34bd6877a8C1878"),
+				accountAddress:  w3.A("0x000000000000000000000000000000000000dEaD"),
+			},
+			wantErr:    false,
+			balanceGte: *big.NewInt(0),
+		},
+	}
+
+	for _, testcase := range tests {
+		tt := testcase
+
+		t.Run(tt.name, func(t *testing.T) {
+			cicnet, err := NewCicNet(conf.rpcProvider, w3.A(conf.tokenIndex))
+
+			if err != nil {
+				t.Fatalf("NewCicNet error = %v", err)
+			}
+
+			got, err := cicnet.BalanceOf(context.Background(), tt.args.contractAddress, tt.args.accountAddress)
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("BalanceOf() error = %v, wantErr %v", err, tt.wantErr)
+			}
+
+			if got.Cmp(&tt.balanceGte) < 0 {
+				t.Fatalf("Token = %v, want %d", got, tt.balanceGte.Int64())
+			}
+		})
+	}
+}

cic_net/token_index_test.go

@@ -0,0 +1,83 @@
+package cic_net
+
+import (
+	"context"
+	"github.com/lmittmann/w3"
+	"math/big"
+	"testing"
+)
+
+func TestCicNet_TokenIndex_EntryCount(t *testing.T) {
+	name := "Entry count"
+	wantErr := false
+
+	t.Run(name, func(t *testing.T) {
+		tokenIndex, err := NewCicNet(conf.rpcProvider, w3.A(conf.tokenIndex))
+
+		if err != nil {
+			t.Fatalf("NewCicNet error = %v", err)
+		}
+
+		got, err := tokenIndex.EntryCount(context.Background())
+
+		if (err != nil) != wantErr {
+			t.Errorf("EntryCount() error = %v, wantErr %v", err, wantErr)
+		}
+
+		if got.Cmp(big.NewInt(0)) < 1 {
+			t.Fatalf("EntryCount() = %v, want %v", got, 1)
+		}
+	})
+}
+
+func TestCicNet_TokenIndex_AddressAtIndex(t *testing.T) {
+	type args struct {
+		index *big.Int
+	}
+
+	tests := []struct {
+		name    string
+		args    args
+		wantErr bool
+		address string
+	}{
+		{
+			name: "Address at index 0",
+			args: args{
+				index: big.NewInt(0),
+			},
+			wantErr: false,
+			address: "0xaB89822F31c2092861F713F6F34bd6877a8C1878",
+		},
+		{
+			name: "Address at index 999",
+			args: args{
+				index: big.NewInt(999),
+			},
+			wantErr: true,
+			address: "",
+		},
+	}
+
+	for _, testcase := range tests {
+		tt := testcase
+
+		t.Run(tt.name, func(t *testing.T) {
+			tokenIndex, err := NewCicNet(conf.rpcProvider, w3.A(conf.tokenIndex))
+
+			if err != nil {
+				t.Fatalf("NewCicNet error = %v", err)
+			}
+
+			got, err := tokenIndex.AddressAtIndex(context.Background(), tt.args.index)
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("AddressAtIndex() error = %v, wantErr %v", err, tt.wantErr)
+			}
+
+			if got != tt.address {
+				t.Fatalf("AddressAtIndex = %v, want %v", got, tt.address)
+			}
+		})
+	}
+}

cic_net/util.go

@@ -0,0 +1,50 @@
+package cic_net
+
+import (
+	"context"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/lmittmann/w3/module/eth"
+	"math/big"
+)
+
+func (c *CicNet) latestNonce(ctx context.Context, address common.Address) (uint64, error) {
+	var nonce uint64
+
+	err := c.ethClient.CallCtx(
+		ctx,
+		eth.Nonce(address, nil).Returns(&nonce),
+	)
+	if err != nil {
+		return 0, err
+	}
+
+	return nonce, nil
+}
+
+func (c *CicNet) signAndCall(ctx context.Context, input []byte, txData WriteTx) (common.Hash, error) {
+	var txHash common.Hash
+
+	nonce, err := c.latestNonce(ctx, txData.from)
+	if err != nil {
+		return [32]byte{}, err
+	}
+
+	tx, err := types.SignNewTx(&txData.privateKey, c.kitabuSigner, &types.LegacyTx{
+		To:       &txData.to,
+		Nonce:    nonce,
+		Data:     input,
+		Gas:      txData.gasLimit,
+		GasPrice: big.NewInt(1),
+	})
+
+	err = c.ethClient.CallCtx(
+		ctx,
+		eth.SendTransaction(tx).Returns(&txHash),
+	)
+	if err != nil {
+		return [32]byte{}, err
+	}
+
+	return txHash, nil
+}