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extrinsic_test.go
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package main | |
import ( | |
"bytes" | |
"fmt" | |
"math/big" | |
"testing" | |
"github.com/centrifuge/go-substrate-rpc-client/v3/scale" | |
"github.com/centrifuge/go-substrate-rpc-client/v3/types" | |
"github.com/stretchr/testify/assert" | |
) | |
func TestEncodeDecodeExtrinsic(t *testing.T) { | |
c, err := NewDefaultConnection() | |
if err != nil { | |
fmt.Println("No connection to node") | |
assert.Fail(t, err.Error()) | |
} | |
AlicePubkey := "0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d" // 15oF4uVJwmo4TdGW7VfQxNLavjCXviqxT9S1MgbjMNHr6Sp5 | |
BobPubkey := "0x8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a48" // 14E5nqKAp3oAJcmzgZhUD2RcptBeUBScxKHgJKU4HPNcKVf3 | |
var amount uint64 = 4200000000 | |
extrinsic, err := c.NewExtrinsic(AlicePubkey, BobPubkey, amount) | |
assert.NoError(t, err) | |
extrinsicString, err := types.EncodeToHexString(extrinsic) | |
if err != nil { | |
assert.NoError(t, err) | |
} | |
fmt.Println("Signed extrinsic: ", extrinsicString) | |
_ = DecodeExtrinsic(t, c, extrinsicString) | |
} | |
func DecodeExtrinsic(t *testing.T, c *Connection, extrinsicString string) error { | |
var decodedExtrinsic types.Extrinsic | |
if err := types.DecodeFromHexString(extrinsicString, &decodedExtrinsic); err != nil { | |
assert.Fail(t, err.Error()) | |
} | |
fmt.Printf("%+v\n", decodedExtrinsic.Method.Args) | |
decoder := scale.NewDecoder(bytes.NewReader(decodedExtrinsic.Method.Args)) | |
// Determine number of calls | |
// NOTE IT IS NECESSARY TO REMOVE BYTE FROM STREAM - otherwise subsequent decoding won't work properly. | |
n, err := decoder.DecodeUintCompact() | |
if err != nil { | |
assert.Fail(t, err.Error()) | |
} | |
fmt.Println("CALLS # ", n) | |
// TODO Maybe loop over n | |
// Probably should get the metadata for the specific block that contains this extrinsic? | |
metadata, _ := c.getLatestMetadata() | |
callFunction := findModule(metadata, decodedExtrinsic.Method.CallIndex) | |
for _, callArg := range callFunction.Args { | |
if callArg.Type == "<T::Lookup as StaticLookup>::Source" { | |
var argValue = types.AccountID{} | |
decoder.Decode(&argValue) | |
fmt.Println(callArg.Name, " = ", argValue) | |
fmt.Printf("%#x\n", argValue) | |
} | |
if callArg.Type == "Compact<T::Balance>" { | |
amount, _ := decoder.DecodeUintCompact() | |
fmt.Println(callArg.Name, " = ", amount) | |
} | |
if callArg.Type == "Vec<u8>" { | |
var argValue = callArg.Name | |
_ = decoder.Decode(&argValue) | |
fmt.Println(callArg.Name, " = ", argValue) | |
} | |
} | |
return nil | |
} | |
func findModule(metadata *types.Metadata, index types.CallIndex) types.FunctionMetadataV4 { | |
for _, mod := range metadata.AsMetadataV13.Modules { | |
if mod.Index == index.SectionIndex { | |
return mod.Calls[index.MethodIndex] | |
} | |
} | |
panic("Unknown call") | |
} |
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