1 files changed, 32 insertions, 0 deletions
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/python/templates/TimestampHelper.py b/third_party/rust/uniffi_bindgen/src/bindings/python/templates/TimestampHelper.py
new file mode 100644
index 0000000000..8402f6095d
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/python/templates/TimestampHelper.py
@@ -0,0 +1,32 @@
+# The Timestamp type.
+Timestamp = datetime.datetime
+
+# There is a loss of precision when converting from Rust timestamps,
+# which are accurate to the nanosecond,
+# to Python datetimes, which have a variable precision due to the use of float as representation.
+class _UniffiConverterTimestamp(_UniffiConverterRustBuffer):
+    @staticmethod
+    def read(buf):
+        seconds = buf.read_i64()
+        microseconds = buf.read_u32() / 1000
+        # Use fromtimestamp(0) then add the seconds using a timedelta.  This
+        # ensures that we get OverflowError rather than ValueError when
+        # seconds is too large.
+        if seconds >= 0:
+            return datetime.datetime.fromtimestamp(0, tz=datetime.timezone.utc) + datetime.timedelta(seconds=seconds, microseconds=microseconds)
+        else:
+            return datetime.datetime.fromtimestamp(0, tz=datetime.timezone.utc) - datetime.timedelta(seconds=-seconds, microseconds=microseconds)
+
+    @staticmethod
+    def write(value, buf):
+        if value >= datetime.datetime.fromtimestamp(0, datetime.timezone.utc):
+            sign = 1
+            delta = value - datetime.datetime.fromtimestamp(0, datetime.timezone.utc)
+        else:
+            sign = -1
+            delta = datetime.datetime.fromtimestamp(0, datetime.timezone.utc) - value
+
+        seconds = delta.seconds + delta.days * 24 * 3600
+        nanoseconds = delta.microseconds * 1000
+        buf.write_i64(sign * seconds)
+        buf.write_u32(nanoseconds)