Feat: added task lifecyle events to Linguo

contracts/standard/arbitration/Linguo.sol

@@ -1,6 +1,6 @@
 /**
  *  @authors: [@unknownunknown1]
- *  @reviewers: [@ferittuncer*, @clesaege*, @satello*]
+ *  @reviewers: [@ferittuncer*, @clesaege*, @satello*, @hbarcelos]
  *  @auditors: []
  *  @bounties: []
  *  @deployments: []
@@ -76,15 +76,39 @@ contract Linguo is Arbitrable {
     /** @dev To be emitted when the new task is created.
      *  @param _taskID The ID of the newly created task.
      *  @param _requester The address that created the task.
+     *  @param _timestamp When the task was created.
      */
-    event TaskCreated(uint indexed _taskID, address indexed _requester);
+    event TaskCreated(uint indexed _taskID, address indexed _requester, uint _timestamp);
+
+    /** @dev To be emitted when a translator assigns the task to himself.
+     *  @param _taskID The ID of the newly created task.
+     *  @param _translator The address that assigned to the task.
+     *  @param _price The task price at the moment it was assigned.
+     *  @param _timestamp When the task was assigned.
+     */
+    event TaskAssigned(uint indexed _taskID, address indexed _translator, uint _price, uint _timestamp);
 
     /** @dev To be emitted when a translation is submitted.
      *  @param _taskID The ID of the respective task.
      *  @param _translator The address that performed the translation.
      *  @param _translatedText A URI to the translated text.
+     *  @param _timestamp When the translation was submitted.
      */
-    event TranslationSubmitted(uint indexed _taskID, address indexed _translator, string _translatedText);
+    event TranslationSubmitted(uint indexed _taskID, address indexed _translator, string _translatedText, uint _timestamp);
+
+    /** @dev To be emitted when a translation is challenged.
+     *  @param _taskID The ID of the respective task.
+     *  @param _challenger The address of the challenger.
+     *  @param _timestamp When the task was challenged.
+     */
+    event TranslationChallenged(uint indexed _taskID, address indexed _challenger, uint _timestamp);
+
+    /** @dev To be emitted when a task is resolved, either by the translation being accepted, the requester being reimbursed or a dispute being settled.
+     *  @param _taskID The ID of the respective task.
+     *  @param _reason Short description of what caused the task to be solved. One of: 'translation-accepted' | 'requester-reimbursed' | 'dispute-settled'
+     *  @param _timestamp When the task was resolved.
+     */
+    event TaskResolved(uint indexed _taskID, string _reason, uint _timestamp);
 
     /** @dev To be emitted when one of the parties successfully paid its appeal fees.
      *  @param _taskID The ID of the respective task.
@@ -191,7 +215,7 @@ contract Linguo is Arbitrable {
         uint _deadline,
         uint _minPrice,
         string _metaEvidence
-    ) external payable returns (uint taskID){
+    ) external payable returns (uint taskID) {
         require(msg.value >= _minPrice, "Deposited value should be greater than or equal to the min price.");
         require(_deadline > now, "The deadline should be in the future.");
 
@@ -205,7 +229,7 @@ contract Linguo is Arbitrable {
         task.requesterDeposit = msg.value;
 
         emit MetaEvidence(taskID, _metaEvidence);
-        emit TaskCreated(taskID, msg.sender);
+        emit TaskCreated(taskID, msg.sender, now);
     }
 
     /** @dev Assigns a specific task to the sender. Requires a translator's deposit.
@@ -234,6 +258,8 @@ contract Linguo is Arbitrable {
 
         remainder = msg.value - deposit;
         msg.sender.send(remainder);
+
+        emit TaskAssigned(_taskID, msg.sender, price, now);
     }
 
     /** @dev Submits translated text for a specific task.
@@ -248,7 +274,7 @@ contract Linguo is Arbitrable {
         task.status = Status.AwaitingReview;
         task.lastInteraction = now;
 
-        emit TranslationSubmitted(_taskID, msg.sender, _translation);
+        emit TranslationSubmitted(_taskID, msg.sender, _translation, now);
     }
 
     /** @dev Reimburses the requester if no one picked the task or the translator failed to submit the translation before deadline.
@@ -265,6 +291,8 @@ contract Linguo is Arbitrable {
 
         task.requesterDeposit = 0;
         task.sumDeposit = 0;
+
+        emit TaskResolved(_taskID, "requester-reimbursed", now);
     }
 
     /** @dev Pays the translator for completed task if no one challenged the translation during review period.
@@ -281,6 +309,8 @@ contract Linguo is Arbitrable {
 
         task.requesterDeposit = 0;
         task.sumDeposit = 0;
+
+        emit TaskResolved(_taskID, "translation-accepted", now);
     }
 
     /** @dev Challenges the translation of a specific task. Requires challenger's deposit.
@@ -308,6 +338,7 @@ contract Linguo is Arbitrable {
         msg.sender.send(remainder);
 
         emit Dispute(arbitrator, task.disputeID, _taskID, _taskID);
+        emit TranslationChallenged(_taskID, msg.sender, now);
     }
 
     /** @dev Takes up to the total amount required to fund a side of an appeal. Reimburses the rest. Creates an appeal if all sides are fully funded.
@@ -482,6 +513,8 @@ contract Linguo is Arbitrable {
 
         task.requesterDeposit = 0;
         task.sumDeposit = 0;
+
+        emit TaskResolved(taskID, "dispute-settled", now);
     }
 
     /** @dev Submit a reference to evidence. EVENT.

test/linguo.js

@@ -223,6 +223,20 @@ contract('Linguo', function(accounts) {
     )
   })
 
+  it('Should emit TaskAssigned event after assigning to the task', async () => {
+    const requiredDeposit = (await linguo.getDepositValue(0)).toNumber()
+    const assignTx = await linguo.assignTask(0, {
+      from: translator,
+      value: requiredDeposit + 1e17
+    })
+
+    assert.equal(
+      assignTx.logs[0].event,
+      'TaskAssigned',
+      'The TaskAssigned event was not emitted'
+    )
+  })
+
   it('Should reimburse requester leftover price after assigning the task and set correct values', async () => {
     const oldBalance = await web3.eth.getBalance(requester)
 
@@ -316,8 +330,14 @@ contract('Linguo', function(accounts) {
   it('Should reimburse requester if no one picked the task before submission timeout ended', async () => {
     await increaseTime(submissionTimeout + 1)
     const oldBalance = await web3.eth.getBalance(requester)
-    await linguo.reimburseRequester(0)
+    const reimburseTx = await linguo.reimburseRequester(0)
     const newBalance = await web3.eth.getBalance(requester)
+
+    assert.equal(
+      reimburseTx.logs[0].event,
+      'TaskResolved',
+      'TaskResolved event was not emitted'
+    )
     assert.equal(
       newBalance.toString(),
       oldBalance.plus(taskMaxPrice).toString(),
@@ -363,8 +383,15 @@ contract('Linguo', function(accounts) {
     const task = await linguo.tasks(0)
 
     const oldBalance = await web3.eth.getBalance(translator)
-    await linguo.acceptTranslation(0)
+    const acceptTx = await linguo.acceptTranslation(0)
     const newBalance = await web3.eth.getBalance(translator)
+
+    assert.equal(
+      acceptTx.logs[0].event,
+      'TaskResolved',
+      'TaskResolved event was not emitted'
+    )
+
     assert.equal(
       newBalance.toString(),
       oldBalance
@@ -398,7 +425,7 @@ contract('Linguo', function(accounts) {
     await expectThrow(linguo.acceptTranslation(0))
   })
 
-  it('Should set correct values in contract and in despute after task has been challenged', async () => {
+  it('Should set correct values in contract and in dispute and emit TranslationChallenged event after task has been challenged', async () => {
     let task
     const requiredDeposit = (await linguo.getDepositValue(0)).toNumber()
 
@@ -413,10 +440,17 @@ contract('Linguo', function(accounts) {
     // add a small amount because javascript can have small deviations up to several hundreds when operating with large numbers
     const challengerDeposit =
       arbitrationFee + (challengeMultiplier * price) / MULTIPLIER_DIVISOR + 1000
-    await linguo.challengeTranslation(0, {
+    const challengeTx = await linguo.challengeTranslation(0, {
       from: challenger,
       value: challengerDeposit
     })
+
+    assert.equal(
+      challengeTx.logs[1].event,
+      'TranslationChallenged',
+      'TranslationChallenged event was not emitted'
+    )
+
     // get task info again because of updated values
     task = await linguo.tasks(0)
     const taskInfo = await linguo.getTaskParties(0)