apps refactor

src/apps/dbutils/cmd_export.cpp

@@ -0,0 +1,48 @@
+#include <iostream>
+
+#include <docopt.h>
+#include "golpe.h"
+
+#include "events.h"
+
+
+static const char USAGE[] =
+R"(
+    Usage:
+      export [--since=<since>] [--until=<until>] [--reverse]
+)";
+
+
+void cmd_export(const std::vector<std::string> &subArgs) {
+    std::map<std::string, docopt::value> args = docopt::docopt(USAGE, subArgs, true, "");
+
+    uint64_t since = 0, until = MAX_U64;
+    if (args["--since"]) since = args["--since"].asLong();
+    if (args["--until"]) until = args["--until"].asLong();
+    bool reverse = args["--reverse"].asBool();
+
+    Decompressor decomp;
+
+    auto txn = env.txn_ro();
+
+    auto dbVersion = getDBVersion(txn);
+
+    if (dbVersion == 0) throw herr("migration from DB version 0 not supported by this version of strfry");
+
+    uint64_t start = reverse ? until : since;
+    uint64_t startDup = reverse ? MAX_U64 : 0;
+
+    env.generic_foreachFull(txn, env.dbi_Event__created_at, lmdb::to_sv<uint64_t>(start), lmdb::to_sv<uint64_t>(startDup), [&](auto k, auto v) {
+        if (reverse) {
+            if (lmdb::from_sv<uint64_t>(k) < since) return false;
+        } else {
+            if (lmdb::from_sv<uint64_t>(k) > until) return false;
+        }
+
+        auto view = lookupEventByLevId(txn, lmdb::from_sv<uint64_t>(v));
+
+        std::cout << getEventJson(txn, decomp, view.primaryKeyId) << "\n";
+
+        return true;
+    }, reverse);
+}