Revert "embed xexpr-path" restore datastore-leveldb and other stuff

This reverts commit f6675ccdd7a5997def3c4656f0e2c5dbbbed1fc8.

1 files changed, 74 insertions, 0 deletions

diff --git a/datastore-leveldb/src/db.cpp b/datastore-leveldb/src/db.cpp
new file mode 100644
index 0000000..991a82e
--- /dev/null
+++ b/datastore-leveldb/src/db.cpp
@@ -0,0 +1,74 @@
+#include "db.h"
+
+#include <iomanip>
+#include <iostream>
+#include <mutex>
+#include <unordered_map>
+#include <sstream>
+
+static std::unordered_map<std::string,leveldb::DB*> dbs;
+static std::mutex getDBmutex;
+
+static bool sensor_name_is_sane(std::string& name) {
+    for (auto it = name.begin(); it != name.end(); ++it) {
+        if (not ((*it >= '0' and *it <= '9') or
+                 (*it >= 'A' and *it <= 'Z') or
+                 (*it >= 'a' and *it <= 'z') or
+                 (*it == '.'))) {
+            return false;
+        }
+    }
+    return true;
+}
+
+std::string db_make_key(const uint64_t timestamp) {
+    std::stringstream key;
+    key << "ts-";
+    key << std::setfill('0') << std::setw(20) << timestamp;
+    return key.str();
+}
+
+leveldb::DB *db_get(std::string& name) {
+    getDBmutex.lock();
+    if (dbs.find(name) == dbs.end()) {
+        if (not sensor_name_is_sane(name)) {
+            getDBmutex.unlock();
+            return nullptr;
+        }
+        leveldb::DB *db;
+        leveldb::Options options;
+        options.create_if_missing = true;
+        leveldb::Status status = leveldb::DB::Open(options, "data/"+name, &db);
+        if (not status.ok()) {
+            std::cout << status.ToString() << std::endl;
+            getDBmutex.unlock();
+            return nullptr;
+        }
+        dbs[name] = db;
+        getDBmutex.unlock();
+        return db;
+    } else {
+        getDBmutex.unlock();
+        return dbs.at(name);
+    }
+}
+
+
+bool db_insert(std::string& name, const uint64_t timestamp, std::string& value) {
+    leveldb::DB *db = db_get(name);
+    if (db == nullptr) return false;
+
+    auto status = db->Put(leveldb::WriteOptions(), db_make_key(timestamp), value);
+    return status.ok();
+}
+
+void db_close() {
+    auto it = dbs.begin();
+    while (it != dbs.end()) {
+	std::cout << "Close Database: " << (*it).first << std::endl;
+        delete (*it).second;
+        dbs.erase(it++); //post increment!
+    }
+    std::cout << std::endl;
+}
+