apps refactor

src/apps/dbutils/cmd_scan.cpp

@@ -0,0 +1,47 @@
+#include <iostream>
+
+#include <docopt.h>
+#include "golpe.h"
+
+#include "DBQuery.h"
+#include "events.h"
+
+
+static const char USAGE[] =
+R"(
+    Usage:
+      scan [--pause=<pause>] [--metrics] [--count] <filter>
+)";
+
+
+void cmd_scan(const std::vector<std::string> &subArgs) {
+    std::map<std::string, docopt::value> args = docopt::docopt(USAGE, subArgs, true, "");
+
+    uint64_t pause = 0;
+    if (args["--pause"]) pause = args["--pause"].asLong();
+
+    bool metrics = args["--metrics"].asBool();
+    bool count = args["--count"].asBool();
+
+    std::string filterStr = args["<filter>"].asString();
+
+
+    DBQuery query(tao::json::from_string(filterStr));
+
+    Decompressor decomp;
+
+    auto txn = env.txn_ro();
+
+    uint64_t numEvents = 0;
+
+    while (1) {
+        bool complete = query.process(txn, [&](const auto &sub, uint64_t levId, std::string_view eventPayload){
+            if (count) numEvents++;
+            else std::cout << getEventJson(txn, decomp, levId, eventPayload) << "\n";
+        }, pause ? pause : MAX_U64, metrics);
+
+        if (complete) break;
+    }
+
+    if (count) std::cout << numEvents << std::endl;
+}