From d3aa4f2bc7f2341a98c4aa6018c0d2ede221a3ed Mon Sep 17 00:00:00 2001
From: Brandon Millman <brandon.millman@gmail.com>
Date: Wed, 24 Jan 2018 17:11:14 -0800
Subject: Respond to GH comments and add /info endpoint

---
 packages/testnet-faucets/README.md         | 35 +++++++++++++++++++++++++++++-
 packages/testnet-faucets/src/ts/handler.ts | 33 ++++++++++++++++++++++++----
 packages/testnet-faucets/src/ts/server.ts  |  1 +
 3 files changed, 64 insertions(+), 5 deletions(-)

diff --git a/packages/testnet-faucets/README.md b/packages/testnet-faucets/README.md
index cd98b4a64..00352cc2a 100644
--- a/packages/testnet-faucets/README.md
+++ b/packages/testnet-faucets/README.md
@@ -53,6 +53,39 @@ yarn dev
 
 ### Endpoints
 
+`GET /ping`
+
+Returns `pong`
+
+`GET /info`
+
+Returns a JSON payload describing the state of the queues for each network. For example:
+
+```json
+{
+    "3":{
+        "ether":{
+            "full":false,
+            "size":4
+        },
+        "zrx":{
+            "full":false,
+            "size":6
+        }
+    },
+    "42":{
+        "ether":{
+            "full":false,
+            "size":8
+        },
+        "zrx":{
+            "full":false,
+            "size":20
+        }
+    }
+}
+```
+
 `GET /ether/:recipient`
 
 Where recipient is a hex encoded Ethereum address prefixed with `0x`.
@@ -63,7 +96,7 @@ Where recipient is a hex encoded Ethereum address prefixed with `0x`.
 
 #### Parameters
 
-Both endpoints take a query parameter named `networkId` to specify the desired network where you would like to receive the ETH or ZRX. For example:
+The endpoints `/ether` and `/zrx` take a query parameter named `networkId` to specify the desired network where you would like to receive the ETH or ZRX. For example:
 
 ```bash
 curl -i http://localhost:3000/ether/0x14e2F1F157E7DD4057D02817436D628A37120FD1\?networkId=3
diff --git a/packages/testnet-faucets/src/ts/handler.ts b/packages/testnet-faucets/src/ts/handler.ts
index 8c859be2e..bf5b3e81e 100644
--- a/packages/testnet-faucets/src/ts/handler.ts
+++ b/packages/testnet-faucets/src/ts/handler.ts
@@ -23,6 +23,11 @@ interface RequestQueueByNetworkId {
     [networkId: string]: RequestQueue;
 }
 
+enum QueueType {
+    ETH = 'ETH',
+    ZRX = 'ZRX',
+}
+
 const DEFAULT_NETWORK_ID = 42; // kovan
 
 export class Handler {
@@ -36,17 +41,37 @@ export class Handler {
             this._zrxRequestQueueByNetworkId[networkId] = new ZRXRequestQueue(web3, +networkId);
         });
     }
+    public getQueueInfo(req: express.Request, res: express.Response) {
+        res.setHeader('Content-Type', 'application/json');
+        const queueInfo = _.mapValues(rpcUrls, (rpcUrl: string, networkId: string) => {
+            utils.consoleLog(networkId);
+            const etherRequestQueue = this._etherRequestQueueByNetworkId[networkId];
+            const zrxRequestQueue = this._zrxRequestQueueByNetworkId[networkId];
+            return {
+                ether: {
+                    full: etherRequestQueue.isFull(),
+                    size: etherRequestQueue.size(),
+                },
+                zrx: {
+                    full: zrxRequestQueue.isFull(),
+                    size: zrxRequestQueue.size(),
+                },
+            };
+        });
+        const payload = JSON.stringify(queueInfo);
+        res.status(200).send(payload);
+    }
     public dispenseEther(req: express.Request, res: express.Response) {
-        this._dispense(req, res, this._etherRequestQueueByNetworkId, 'ETH');
+        this._dispense(req, res, this._etherRequestQueueByNetworkId, QueueType.ETH);
     }
     public dispenseZRX(req: express.Request, res: express.Response) {
-        this._dispense(req, res, this._zrxRequestQueueByNetworkId, 'ZRX');
+        this._dispense(req, res, this._zrxRequestQueueByNetworkId, QueueType.ZRX);
     }
     private _dispense(
         req: express.Request,
         res: express.Response,
         requestQueueByNetworkId: RequestQueueByNetworkId,
-        assetSymbol: string,
+        queueType: QueueType,
     ) {
         const recipientAddress = req.params.recipient;
         if (_.isUndefined(recipientAddress) || !this._isValidEthereumAddress(recipientAddress)) {
@@ -65,7 +90,7 @@ export class Handler {
             res.status(503).send('QUEUE_IS_FULL');
             return;
         }
-        utils.consoleLog(`Added ${lowerCaseRecipientAddress} to queue: ${assetSymbol} networkId: ${networkId}`);
+        utils.consoleLog(`Added ${lowerCaseRecipientAddress} to queue: ${queueType} networkId: ${networkId}`);
         res.status(200).end();
     }
     // tslint:disable-next-line:prefer-function-over-method
diff --git a/packages/testnet-faucets/src/ts/server.ts b/packages/testnet-faucets/src/ts/server.ts
index 23642787d..26edfff5a 100644
--- a/packages/testnet-faucets/src/ts/server.ts
+++ b/packages/testnet-faucets/src/ts/server.ts
@@ -19,6 +19,7 @@ const handler = new Handler();
 app.get('/ping', (req: express.Request, res: express.Response) => {
     res.status(200).send('pong');
 });
+app.get('/info', handler.getQueueInfo.bind(handler));
 app.get('/ether/:recipient', handler.dispenseEther.bind(handler));
 app.get('/zrx/:recipient', handler.dispenseZRX.bind(handler));
 
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