built snowflake into the session manager

infra/session_manager/test/session_id_decoder.cpp

@@ -0,0 +1,37 @@
+#include <time.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv)
+{
+    if (argc != 2)
+    {
+        printf("Usage: %s <id>\n", argv[0]);
+        return -1;
+    }
+
+    uint64_t id = atoll(argv[1]);
+
+    uint64_t sequence = id & 0x7FFF;
+    uint64_t time_relative = (id >> 15) & 0xFFFFFFF;
+    uint64_t seed = (id >> 43) & 0xFFFFF;
+
+    uint64_t thread_id = seed & 0xFF;
+    uint64_t instance_id = (seed >> 8) & 0xFFF;
+
+    printf("id: %lu, seed: %lu, instance_id: %lu, thread_id: %lu, time_relative: %lu, sequence: %lu\n", id, seed, instance_id, thread_id, time_relative, sequence);
+
+#define MAX_ID_BASE_TIME (268435456L)
+
+    for (int i = 6; i < 10; i++)
+    {
+        char buff[64];
+        time_t tt = MAX_ID_BASE_TIME * i + time_relative;
+        struct tm *tm = localtime(&tt);
+        strftime(buff, sizeof(buff), "%Y-%m-%d %H:%M:%S", tm);
+        printf("\ttime_period * %d + time_relative => %s\n", i, buff);
+    }
+
+    return 0;
+}