Merge bitcoin/bitcoin#26207: rest: add verbose and mempool_sequence query params for mempool/contents

1ff5d61dfd doc: add mempool/contents rest verbose and mempool_sequence args (Andrew Toth)
52a31dccc9 tests: mempool/contents verbose and mempool_sequence query params tests (Andrew Toth)
a518fff0f2 rest: add verbose and mempool_sequence query params for mempool/contents (Andrew Toth)

Pull request description:

  The verbose mempool json response can get very large. This adds an option to return the non-verbose response of just the txids. It is identical to the rpc response so the diff here is minimal. This also adds the mempool_sequence parameter for rpc consistency. Verbose defaults to true to remain backwards compatible.

  It uses query parameters to be compatible with the efforts in https://github.com/bitcoin/bitcoin/issues/25752.

ACKs for top commit:
  achow101:
    ACK 1ff5d61dfd
  stickies-v:
    re-ACK [1ff5d61](1ff5d61dfd)
  pablomartin4btc:
    tested ACK 1ff5d61dfd.

Tree-SHA512: 1bf08a7ffde2e7db14dc746e421feedf17d84c4b3f1141e79e36feb6014811dfde80e1d8dbc476c15ff705de2d3c967b3081dcd80536d76b7edf888f1a92e9d1

doc/REST-interface.md

@@ -134,11 +134,15 @@ Returns various information about the transaction mempool.
 Only supports JSON as output format.
 Refer to the `getmempoolinfo` RPC help for details.
 
-`GET /rest/mempool/contents.json`
+`GET /rest/mempool/contents.json?verbose=<true|false>&mempool_sequence=<false|true>`
 
 Returns the transactions in the mempool.
 Only supports JSON as output format.
-Refer to the `getrawmempool` RPC help for details.
+Refer to the `getrawmempool` RPC help for details. Defaults to setting
+`verbose=true` and `mempool_sequence=false`.
+
+*Query parameters for `verbose` and `mempool_sequence` available in 25.0 and up.*
+
 
 Risks
 -------------

src/rest.cpp

@@ -652,7 +652,20 @@ static bool rest_mempool(const std::any& context, HTTPRequest* req, const std::s
     case RESTResponseFormat::JSON: {
         std::string str_json;
         if (param == "contents") {
-            str_json = MempoolToJSON(*mempool, true).write() + "\n";
+            const std::string raw_verbose{req->GetQueryParameter("verbose").value_or("true")};
+            if (raw_verbose != "true" && raw_verbose != "false") {
+                return RESTERR(req, HTTP_BAD_REQUEST, "The \"verbose\" query parameter must be either \"true\" or \"false\".");
+            }
+            const std::string raw_mempool_sequence{req->GetQueryParameter("mempool_sequence").value_or("false")};
+            if (raw_mempool_sequence != "true" && raw_mempool_sequence != "false") {
+                return RESTERR(req, HTTP_BAD_REQUEST, "The \"mempool_sequence\" query parameter must be either \"true\" or \"false\".");
+            }
+            const bool verbose{raw_verbose == "true"};
+            const bool mempool_sequence{raw_mempool_sequence == "true"};
+            if (verbose && mempool_sequence) {
+                return RESTERR(req, HTTP_BAD_REQUEST, "Verbose results cannot contain mempool sequence values. (hint: set \"verbose=false\")");
+            }
+            str_json = MempoolToJSON(*mempool, verbose, mempool_sequence).write() + "\n";
         } else {
             str_json = MempoolInfoToJSON(*mempool).write() + "\n";
         }

test/functional/interface_rest.py

@@ -347,6 +347,34 @@ class RESTTest (BitcoinTestFramework):
             assert_equal(json_obj[tx]['spentby'], txs[i + 1:i + 2])
             assert_equal(json_obj[tx]['depends'], txs[i - 1:i])
 
+        # Check the mempool response for explicit parameters
+        json_obj = self.test_rest_request("/mempool/contents", query_params={"verbose": "true", "mempool_sequence": "false"})
+        assert_equal(json_obj, raw_mempool_verbose)
+
+        # Check the mempool response for not verbose
+        json_obj = self.test_rest_request("/mempool/contents", query_params={"verbose": "false"})
+        raw_mempool = self.nodes[0].getrawmempool(verbose=False)
+
+        assert_equal(json_obj, raw_mempool)
+
+        # Check the mempool response for sequence
+        json_obj = self.test_rest_request("/mempool/contents", query_params={"verbose": "false", "mempool_sequence": "true"})
+        raw_mempool = self.nodes[0].getrawmempool(verbose=False, mempool_sequence=True)
+
+        assert_equal(json_obj, raw_mempool)
+
+        # Check for error response if verbose=true and mempool_sequence=true
+        resp = self.test_rest_request("/mempool/contents", ret_type=RetType.OBJ, status=400, query_params={"verbose": "true", "mempool_sequence": "true"})
+        assert_equal(resp.read().decode('utf-8').strip(), 'Verbose results cannot contain mempool sequence values. (hint: set "verbose=false")')
+
+        # Check for error response if verbose is not "true" or "false"
+        resp = self.test_rest_request("/mempool/contents", ret_type=RetType.OBJ, status=400, query_params={"verbose": "TRUE"})
+        assert_equal(resp.read().decode('utf-8').strip(), 'The "verbose" query parameter must be either "true" or "false".')
+
+        # Check for error response if mempool_sequence is not "true" or "false"
+        resp = self.test_rest_request("/mempool/contents", ret_type=RetType.OBJ, status=400, query_params={"verbose": "false", "mempool_sequence": "TRUE"})
+        assert_equal(resp.read().decode('utf-8').strip(), 'The "mempool_sequence" query parameter must be either "true" or "false".')
+
         # Now mine the transactions
         newblockhash = self.generate(self.nodes[1], 1)