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Merge pull request #69 from coinbase/patrick/scenario-parsing
Scenario Processing
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// Copyright 2020 Coinbase, Inc. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package scenario | ||
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import ( | ||
"context" | ||
"encoding/json" | ||
"fmt" | ||
"math/big" | ||
"strings" | ||
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"github.com/coinbase/rosetta-sdk-go/types" | ||
) | ||
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const ( | ||
// Scenarios can contain one of many of the following reserved | ||
// keywords that are automatically populated. | ||
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// Sender is the sender and signer of a transaction. | ||
Sender = "{{ SENDER }}" | ||
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// SenderValue is the amount the sender is paying. | ||
SenderValue = "{{ SENDER_VALUE }}" | ||
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// Recipient is the recipient of the transaction. | ||
Recipient = "{{ RECIPIENT }}" | ||
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// RecipientValue is the amount the recipient is | ||
// receiving from the sender. Note, this is distinct | ||
// from the SenderValue so that UTXO transfers | ||
// can be supported. | ||
RecipientValue = "{{ RECIPIENT_VALUE }}" | ||
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// UTXOIdentifier is the globally unique identifier | ||
// of a UTXO. This should be in the Operation.metadata | ||
// of any UTXO-based blockchain ("utxo_created" when | ||
// a new UTXO is created and "utxo_spent" when a | ||
// UTXO is spent). | ||
UTXOIdentifier = "{{ UTXO_IDENTIFIER }}" | ||
) | ||
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// Context is all information passed to PopulateScenario. | ||
// As more exotic scenario testing is supported, this will | ||
// likely be expanded. | ||
type Context struct { | ||
Sender string | ||
SenderValue *big.Int | ||
Recipient string | ||
RecipientValue *big.Int | ||
UTXOIdentifier string | ||
Currency *types.Currency | ||
} | ||
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// PopulateScenario populates a provided scenario (slice of | ||
// []*types.Operation) with the information in Context. | ||
func PopulateScenario( | ||
ctx context.Context, | ||
scenarioContext *Context, | ||
scenario []*types.Operation, | ||
) ([]*types.Operation, error) { | ||
// Convert operations to a string | ||
bytes, err := json.Marshal(scenario) | ||
if err != nil { | ||
return nil, fmt.Errorf("%w: unable to marshal scenario", err) | ||
} | ||
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// Replace all keywords with information in Context | ||
stringBytes := string(bytes) | ||
stringBytes = strings.ReplaceAll(stringBytes, Sender, scenarioContext.Sender) | ||
stringBytes = strings.ReplaceAll( | ||
stringBytes, | ||
SenderValue, | ||
new(big.Int).Neg(scenarioContext.SenderValue).String(), | ||
) | ||
stringBytes = strings.ReplaceAll(stringBytes, Recipient, scenarioContext.Recipient) | ||
stringBytes = strings.ReplaceAll( | ||
stringBytes, | ||
RecipientValue, | ||
new(big.Int).Abs(scenarioContext.RecipientValue).String(), | ||
) | ||
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if len(scenarioContext.UTXOIdentifier) > 0 { | ||
stringBytes = strings.ReplaceAll( | ||
stringBytes, | ||
UTXOIdentifier, | ||
scenarioContext.UTXOIdentifier, | ||
) | ||
} | ||
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// Convert back to ops | ||
var ops []*types.Operation | ||
if err := json.Unmarshal([]byte(stringBytes), &ops); err != nil { | ||
return nil, fmt.Errorf("%w: unable to unmarshal ops", err) | ||
} | ||
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// Post-process operations | ||
for _, op := range ops { | ||
if op.Amount != nil { | ||
op.Amount.Currency = scenarioContext.Currency | ||
} | ||
} | ||
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return ops, nil | ||
} |
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// Copyright 2020 Coinbase, Inc. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package scenario | ||
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import ( | ||
"context" | ||
"math/big" | ||
"testing" | ||
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"github.com/coinbase/rosetta-sdk-go/types" | ||
"github.com/stretchr/testify/assert" | ||
) | ||
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var ( | ||
sender = "addr1" | ||
senderValue = big.NewInt(100) | ||
recipient = "addr2" | ||
recipientValue = big.NewInt(90) | ||
utxoIdentifier = "utxo1" | ||
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bitcoinCurrency = &types.Currency{ | ||
Symbol: "BTC", | ||
Decimals: 8, | ||
} | ||
ethereumCurrency = &types.Currency{ | ||
Symbol: "ETH", | ||
Decimals: 18, | ||
} | ||
) | ||
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func TestPopulateScenario(t *testing.T) { | ||
var tests = map[string]struct { | ||
context *Context | ||
scenario []*types.Operation | ||
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expected []*types.Operation | ||
}{ | ||
"bitcoin": { | ||
context: &Context{ | ||
Sender: sender, | ||
SenderValue: senderValue, | ||
Recipient: recipient, | ||
RecipientValue: recipientValue, | ||
UTXOIdentifier: utxoIdentifier, | ||
Currency: bitcoinCurrency, | ||
}, | ||
scenario: []*types.Operation{ | ||
{ | ||
Type: "Vin", | ||
OperationIdentifier: &types.OperationIdentifier{ | ||
Index: 0, | ||
}, | ||
Account: &types.AccountIdentifier{ | ||
Address: "{{ SENDER }}", | ||
}, | ||
Amount: &types.Amount{ | ||
Value: "{{ SENDER_VALUE }}", | ||
}, | ||
Metadata: map[string]interface{}{ | ||
"utxo_spent": "{{ UTXO_IDENTIFIER }}", | ||
}, | ||
}, | ||
{ | ||
Type: "Vout", | ||
OperationIdentifier: &types.OperationIdentifier{ | ||
Index: 1, | ||
}, | ||
Account: &types.AccountIdentifier{ | ||
Address: "{{ RECIPIENT }}", | ||
}, | ||
Amount: &types.Amount{ | ||
Value: "{{ RECIPIENT_VALUE }}", | ||
}, | ||
}, | ||
}, | ||
expected: []*types.Operation{ | ||
{ | ||
Type: "Vin", | ||
OperationIdentifier: &types.OperationIdentifier{ | ||
Index: 0, | ||
}, | ||
Account: &types.AccountIdentifier{ | ||
Address: sender, | ||
}, | ||
Amount: &types.Amount{ | ||
Value: new(big.Int).Neg(senderValue).String(), | ||
Currency: bitcoinCurrency, | ||
}, | ||
Metadata: map[string]interface{}{ | ||
"utxo_spent": utxoIdentifier, | ||
}, | ||
}, | ||
{ | ||
Type: "Vout", | ||
OperationIdentifier: &types.OperationIdentifier{ | ||
Index: 1, | ||
}, | ||
Account: &types.AccountIdentifier{ | ||
Address: recipient, | ||
}, | ||
Amount: &types.Amount{ | ||
Value: new(big.Int).Abs(recipientValue).String(), | ||
Currency: bitcoinCurrency, | ||
}, | ||
}, | ||
}, | ||
}, | ||
"ethereum": { | ||
context: &Context{ | ||
Sender: sender, | ||
SenderValue: senderValue, | ||
Recipient: recipient, | ||
RecipientValue: recipientValue, | ||
Currency: ethereumCurrency, | ||
}, | ||
scenario: []*types.Operation{ | ||
{ | ||
Type: "transfer", | ||
OperationIdentifier: &types.OperationIdentifier{ | ||
Index: 0, | ||
}, | ||
Account: &types.AccountIdentifier{ | ||
Address: "{{ SENDER }}", | ||
}, | ||
Amount: &types.Amount{ | ||
Value: "{{ SENDER_VALUE }}", | ||
}, | ||
}, | ||
{ | ||
Type: "transfer", | ||
OperationIdentifier: &types.OperationIdentifier{ | ||
Index: 1, | ||
}, | ||
RelatedOperations: []*types.OperationIdentifier{ | ||
{ | ||
Index: 0, | ||
}, | ||
}, | ||
Account: &types.AccountIdentifier{ | ||
Address: "{{ RECIPIENT }}", | ||
}, | ||
Amount: &types.Amount{ | ||
Value: "{{ RECIPIENT_VALUE }}", | ||
}, | ||
}, | ||
}, | ||
expected: []*types.Operation{ | ||
{ | ||
Type: "transfer", | ||
OperationIdentifier: &types.OperationIdentifier{ | ||
Index: 0, | ||
}, | ||
Account: &types.AccountIdentifier{ | ||
Address: sender, | ||
}, | ||
Amount: &types.Amount{ | ||
Value: new(big.Int).Neg(senderValue).String(), | ||
Currency: ethereumCurrency, | ||
}, | ||
}, | ||
{ | ||
Type: "transfer", | ||
OperationIdentifier: &types.OperationIdentifier{ | ||
Index: 1, | ||
}, | ||
RelatedOperations: []*types.OperationIdentifier{ | ||
{ | ||
Index: 0, | ||
}, | ||
}, | ||
Account: &types.AccountIdentifier{ | ||
Address: recipient, | ||
}, | ||
Amount: &types.Amount{ | ||
Value: new(big.Int).Abs(recipientValue).String(), | ||
Currency: ethereumCurrency, | ||
}, | ||
}, | ||
}, | ||
}, | ||
} | ||
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for name, test := range tests { | ||
t.Run(name, func(t *testing.T) { | ||
ctx := context.Background() | ||
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ops, err := PopulateScenario( | ||
ctx, | ||
test.context, | ||
test.scenario, | ||
) | ||
assert.NoError(t, err) | ||
assert.ElementsMatch(t, test.expected, ops) | ||
}) | ||
} | ||
} |