Add statistics class

rocksdb/options.pxd

@@ -11,6 +11,7 @@ from .slice_ cimport Slice
 from .snapshot cimport Snapshot
 from .slice_transform cimport SliceTransform
 from .table_factory cimport TableFactory
+from .statistics cimport Statistics
 from .memtablerep cimport MemTableRepFactory
 from .universal_compaction cimport CompactionOptionsUniversal
 from .cache cimport Cache

rocksdb/statistics.pxd

@@ -1,5 +1,9 @@
-from libc.stdint cimport uint32_t, uint8_t
-from .std_memory cimport shared_ptr
+from libc.stdint cimport uint32_t, uint8_t, uint64_t
+from libcpp.memory cimport shared_ptr
+from libcpp.string cimport string
+from libcpp cimport bool as cpp_bool
+from libcpp.map cimport map
+from .status cimport Status
 
 cdef extern from "rocksdb/statistics.h" namespace "rocksdb":
     ctypedef enum StatsLevel:
@@ -9,5 +13,32 @@ cdef extern from "rocksdb/statistics.h" namespace "rocksdb":
         kExceptTimeForMutex
         kAll
 
+    cdef cppclass HistogramData:
+        double median
+        double percentile95
+        double percentile99
+        double average
+        double standard_deviation
+        double max
+        uint64_t count
+        uint64_t sum
+        double min
+
     cdef cppclass Statistics:
+        const char* Type() nogil except+
+        uint64_t getTickerCount(uint32_t) nogil except+
+        void histogramData(uint32_t type,
+                           HistogramData* const) nogil except+
+        string getHistogramString(uint32_t) nogil except+
+        void recordTick(uint32_t, uint64_t) nogil except+
+        void setTickerCount(uint32_t tickerType, uint64_t count) nogil except+
+        uint64_t getAndResetTickerCount(uint32_t) nogil except+
+        void reportTimeToHistogram(uint32_t, uint64_t) nogil except+
+        void measureTime(uint32_t, uint64_t) nogil except+
+        void recordInHistogram(uint32_t, uint64_t) nogil except+
+        Status Reset() nogil except+
+        string ToString() nogil except+
+        cpp_bool getTickerMap(map[string, uint64_t]*) nogil except+
+        cpp_bool HistEnabledForType(uint32_t type) nogil except+
         void set_stats_level(StatsLevel) nogil except+
+        StatsLevel get_stats_level() nogil except+