SERVER-26927 Rename maxStalenessMS to maxStalenessSeconds and support doubles

2 files changed, 27 insertions, 0 deletions

diff --git a/src/mongo/bson/util/bson_extract.cpp b/src/mongo/bson/util/bson_extract.cpp
index b3ff37ca1b2..84c9cc92de6 100644
--- a/src/mongo/bson/util/bson_extract.cpp
+++ b/src/mongo/bson/util/bson_extract.cpp
@@ -170,6 +170,21 @@ Status bsonExtractIntegerField(const BSONObj& object, StringData fieldName, long
     return Status::OK();
 }
 
+Status bsonExtractDoubleField(const BSONObj& object, StringData fieldName, double* out) {
+    BSONElement value;
+    Status status = bsonExtractField(object, fieldName, &value);
+    if (!status.isOK())
+        return status;
+    if (!value.isNumber()) {
+        return Status(ErrorCodes::TypeMismatch,
+                      mongoutils::str::stream() << "Expected field \"" << fieldName
+                                                << "\" to have numeric type, but found "
+                                                << typeName(value.type()));
+    }
+    *out = value.numberDouble();
+    return Status::OK();
+}
+
 Status bsonExtractIntegerFieldWithDefault(const BSONObj& object,
                                           StringData fieldName,
                                           long long defaultValue,
diff --git a/src/mongo/bson/util/bson_extract.h b/src/mongo/bson/util/bson_extract.h
index a2189a4d57b..cedc84cd01f 100644
--- a/src/mongo/bson/util/bson_extract.h
+++ b/src/mongo/bson/util/bson_extract.h
@@ -86,6 +86,18 @@ Status bsonExtractBooleanField(const BSONObj& object, StringData fieldName, bool
 Status bsonExtractIntegerField(const BSONObj& object, StringData fieldName, long long* out);
 
 /**
+ * Finds an element named "fieldName" in "object" that represents a double-precision floating point
+ * value.
+ *
+ * Returns Status::OK() and sets *out to the element's double floating point value representation on
+ * success. Returns ErrorCodes::NoSuchKey if there are no matches for "fieldName". Returns
+ * ErrorCodes::TypeMismatch if the value of the matching element is not of a numeric type. Returns
+ * ErrorCodes::BadValue if the value does not have an exact floating point number representation.
+ * For return values other than Status::OK(), the resulting value of "*out" is undefined.
+ */
+Status bsonExtractDoubleField(const BSONObj& object, StringData fieldName, double* out);
+
+/**
  * Finds a string-typed element named "fieldName" in "object" and stores its value in "out".
  *
  * Returns Status::OK() and sets *out to the found element's std::string value on success.  Returns