remove precision, add hostname conversion

Author: TheYonkk

influxdb.hpp

@@ -13,6 +13,7 @@
 #include <sstream>
 #include <cstring>
 #include <cstdio>
+#include <cstdlib>
 
 #ifdef _WIN32
     #define NOMINMAX
@@ -30,6 +31,7 @@
     #include <sys/socket.h>
     #include <sys/uio.h>
     #include <netinet/in.h>
+    #include <netdb.h>
     #include <arpa/inet.h>
     #define closesocket close
 #endif
@@ -41,9 +43,26 @@ namespace influxdb_cpp {
         std::string db_;
         std::string usr_;
         std::string pwd_;
-        std::string precision_;
-        server_info(const std::string& host, int port, const std::string& db = "", const std::string& usr = "", const std::string& pwd = "", const std::string& precision="ms")
-            : host_(host), port_(port), db_(db), usr_(usr), pwd_(pwd), precision_(precision) {}
+        server_info(const std::string& host, int port, const std::string& db = "", const std::string& usr = "", const std::string& pwd = "") {
+            port_ = port;
+            db_   = db;
+            usr_  = usr;
+            pwd_  = pwd;  
+
+            //convert hostname to ip-address
+            hostent * record = gethostbyname(host.c_str());
+            if(record == NULL)
+            {
+                printf("Cannot resolve IP address from hostname: %s is unavailable. Try to ping the host.\n", host.c_str());
+                std::exit(-1);
+            }
+            in_addr * address = (in_addr * )record->h_addr;
+            std::string ip_address = inet_ntoa(* address);
+
+            printf("Resolved IP address from hostname: %s.\n", ip_address.c_str());
+
+            host_ = ip_address;
+        }
     };
     namespace detail {
         struct meas_caller;
@@ -105,7 +124,6 @@ namespace influxdb_cpp {
             lines_ << delim;
             _escape(k, ",= ");
             lines_.precision(prec);
-            lines_.setf(std::ios::fixed);
             lines_ << '=' << v;
             return (detail::field_caller&)*this;
         }
@@ -206,6 +224,7 @@ namespace influxdb_cpp {
 
             addr.sin_family = AF_INET;
             addr.sin_port = htons(si.port_);
+
             if((addr.sin_addr.s_addr = inet_addr(si.host_.c_str())) == INADDR_NONE) return -1;
 
             if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) return -2;
@@ -219,8 +238,8 @@ namespace influxdb_cpp {
 
             for(;;) {
                 iv[0].iov_len = snprintf(&header[0], len,
-                    "%s /%s?db=%s&u=%s&p=%s&epoch=%s%s HTTP/1.1\r\nHost: %s\r\nContent-Length: %d\r\n\r\n",
-                    method, uri, si.db_.c_str(), si.usr_.c_str(), si.pwd_.c_str(), si.precision_.c_str(),
+                    "%s /%s?db=%s&u=%s&p=%s%s HTTP/1.1\r\nHost: %s\r\nContent-Length: %d\r\n\r\n",
+                    method, uri, si.db_.c_str(), si.usr_.c_str(), si.pwd_.c_str(),
                     querystring.c_str(), si.host_.c_str(), (int)body.length());
                 if((int)iv[0].iov_len >= len)
                     header.resize(len *= 2);