1 files changed, 95 insertions, 0 deletions
diff --git a/datastore-leveldb/src/web.cpp b/datastore-leveldb/src/web.cpp
new file mode 100644
index 0000000..4898451
--- /dev/null
+++ b/datastore-leveldb/src/web.cpp
@@ -0,0 +1,95 @@
+#include "web.h"
+#include "db.h"
+#include <leveldb/comparator.h>
+#include <iomanip>
+
+static inline std::string make_key(uint64_t timestamp) {
+    std::stringstream key;
+    key << "ts-";
+    key << std::setfill('0') << std::setw(20) << timestamp;
+    return key.str();
+}
+
+void web_handle_api_value(const boost::cmatch &match, struct mg_connection *conn) {
+//    const struct mg_request_info *request_info = mg_get_request_info(conn);
+
+    std::string sensor(match[1].str());
+    uint64_t timestamp = std::stoul(match[2].str());
+    char buf[1024];
+    int count = mg_read(conn, buf, 1024);
+    std::string value(buf, count);
+
+    leveldb::DB *db = getDB(sensor);
+    if (db == nullptr) {
+        std::cout << "failed to get db for " << sensor << std::endl;
+        mg_printf(conn, "HTTP/1.1 500 Internal Error\r\n\r\n");
+        return;
+    }
+
+    std::cout << "sensor=" << sensor << " key=" << make_key(timestamp) << std::endl;
+    db->Put(leveldb::WriteOptions(), make_key(timestamp), value);
+    mg_printf(conn, "HTTP/1.1 200 Value received\r\n\r\n");
+}
+
+void web_handle_api_range(const boost::cmatch &match, struct mg_connection *conn) {
+    static const leveldb::Comparator *cmp = leveldb::BytewiseComparator();
+
+    std::string sensor(match[1].str());
+    uint64_t start = std::stoul(match[2].str());
+    uint64_t end = std::stoul(match[3].str());
+    std::string key_start(std::move(make_key(start)));
+    std::string key_end(std::move(make_key(end)));
+
+    leveldb::DB *db = getDB(sensor);
+    if (db == nullptr) {
+        mg_printf(conn, "HTTP/1.1 500 Internal Error\r\n\r\n");
+        return;
+    }
+
+    mg_printf(conn,
+            "HTTP/1.1 200 Value received\r\n"
+            "Content-Type: application/json; encoding=UTF-8\r\n"
+            "\r\n");
+
+    std::cout << "sensor=" << sensor << " start=" << start << " end=" << end << std::endl;
+
+    std::ostringstream out;
+    out << "{'sensor':'" << sensor << "', 'error':null, 'data':[";
+    mg_write(conn, out.str().c_str(), out.str().size());
+
+    leveldb::Iterator* it = db->NewIterator(leveldb::ReadOptions());
+    bool first = true;
+    std::ostringstream outbuf;
+    for (it->Seek(key_start); 
+            it->Valid() && cmp->Compare(it->key(), key_end) < 0;
+            it->Next()) {
+        const char *key = it->key().data();
+        size_t key_size =  it->key().size();
+        if (key_size != 20+3) {
+            std::cerr << "invalid key" << std::endl;
+            return;
+        }
+
+        unsigned int offset = 3; // "ts-"
+        // skip zeros in timestamp
+        while (offset < key_size-1 and *(key+offset) == '0')
+            offset++;
+
+        if (first)
+            first = false;
+        else
+            outbuf << ',';
+
+        outbuf << '[';
+        outbuf.write(key+offset, key_size-offset);
+        outbuf << ',';
+        outbuf.write(it->value().data(), it->value().size());
+        outbuf << ']';
+
+        mg_write(conn, outbuf.str().c_str(), outbuf.tellp());
+        outbuf.seekp(0);
+    }
+    mg_printf(conn, "]}\r\n");
+    delete it;
+}
+