accounts/abi/bind: support generating bindings for various arrays

accounts/abi/bind/bind.go

@@ -23,6 +23,7 @@ package bind
 import (
 	"bytes"
 	"fmt"
+	"regexp"
 	"strings"
 	"text/template"
 	"unicode"
@@ -122,31 +123,37 @@ func bindType(kind abi.Type) string {
 	stringKind := kind.String()
 
 	switch {
-	case stringKind == "address":
-		return "common.Address"
-
-	case stringKind == "address[]":
-		return "[]common.Address"
+	case strings.HasPrefix(stringKind, "address"):
+		parts := regexp.MustCompile("address(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
+		if len(parts) != 2 {
+			return stringKind
+		}
+		return fmt.Sprintf("%scommon.Address", parts[1])
 
 	case strings.HasPrefix(stringKind, "bytes"):
-		if stringKind == "bytes" {
-			return "[]byte"
+		parts := regexp.MustCompile("bytes([0-9]*)(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
+		if len(parts) != 3 {
+			return stringKind
 		}
-		return fmt.Sprintf("[%s]byte", stringKind[5:])
+		return fmt.Sprintf("%s[%s]byte", parts[2], parts[1])
 
-	case strings.HasPrefix(stringKind, "int"):
-		switch stringKind[:3] {
-		case "8", "16", "32", "64":
+	case strings.HasPrefix(stringKind, "int") || strings.HasPrefix(stringKind, "uint"):
+		parts := regexp.MustCompile("(u)?int([0-9]*)(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
+		if len(parts) != 4 {
 			return stringKind
 		}
-		return "*big.Int"
-
-	case strings.HasPrefix(stringKind, "uint"):
-		switch stringKind[:4] {
+		switch parts[2] {
 		case "8", "16", "32", "64":
+			return fmt.Sprintf("%s%sint%s", parts[3], parts[1], parts[2])
+		}
+		return fmt.Sprintf("%s*big.Int", parts[3])
+
+	case strings.HasPrefix(stringKind, "bool") || strings.HasPrefix(stringKind, "string"):
+		parts := regexp.MustCompile("([a-z]+)(\\[[0-9]*\\])?").FindStringSubmatch(stringKind)
+		if len(parts) != 3 {
 			return stringKind
 		}
-		return "*big.Int"
+		return fmt.Sprintf("%s%s", parts[2], parts[1])
 
 	default:
 		return stringKind

accounts/abi/bind/bind_test.go

@@ -228,6 +228,50 @@ var bindTests = []struct {
 			}
 		`,
 	},
+	// Tests that arrays/slices can be properly returned and deserialized.
+	// Only addresses are tested, remainder just compiled to keep the test small.
+	{
+		`Slicer`,
+		`
+			contract Slicer {
+				function echoAddresses(address[] input) constant returns (address[] output) {
+					return input;
+				}
+				function echoInts(int[] input) constant returns (int[] output) {
+					return input;
+				}
+				function echoFancyInts(uint24[23] input) constant returns (uint24[23] output) {
+					return input;
+				}
+				function echoBools(bool[] input) constant returns (bool[] output) {
+					return input;
+				}
+			}
+		`,
+		`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`,
+		`[{"constant":true,"inputs":[{"name":"input","type":"address[]"}],"name":"echoAddresses","outputs":[{"name":"output","type":"address[]"}],"type":"function"},{"constant":true,"inputs":[{"name":"input","type":"uint24[23]"}],"name":"echoFancyInts","outputs":[{"name":"output","type":"uint24[23]"}],"type":"function"},{"constant":true,"inputs":[{"name":"input","type":"int256[]"}],"name":"echoInts","outputs":[{"name":"output","type":"int256[]"}],"type":"function"},{"constant":true,"inputs":[{"name":"input","type":"bool[]"}],"name":"echoBools","outputs":[{"name":"output","type":"bool[]"}],"type":"function"}]`,
+		`
+			// Generate a new random account and a funded simulator
+			key := crypto.NewKey(rand.Reader)
+			sim := backends.NewSimulatedBackend(core.GenesisAccount{Address: key.Address, Balance: big.NewInt(10000000000)})
+
+			// Convert the tester key to an authorized transactor for ease of use
+			auth := bind.NewKeyedTransactor(key)
+
+			// Deploy a slice tester contract and execute a n array call on it
+			_, _, slicer, err := DeploySlicer(auth, sim)
+			if err != nil {
+					t.Fatalf("Failed to deploy slicer contract: %v", err)
+			}
+			sim.Commit()
+
+			if out, err := slicer.EchoAddresses(nil, []common.Address{key.Address, common.Address{}}); err != nil {
+					t.Fatalf("Failed to call slice echoer: %v", err)
+			} else if !reflect.DeepEqual(out, []common.Address{key.Address, common.Address{}}) {
+					t.Fatalf("Slice return mismatch: have %v, want %v", out, []common.Address{key.Address, common.Address{}})
+			}
+		`,
+	},
 	// Tests that anonymous default methods can be correctly invoked
 	{
 		`Defaulter`,