Add a method to get from an SPL

apps/cli/utilities/core_sampler/core_sampler/core_sampler.py

@@ -119,6 +119,21 @@ class CoreSampler:
         self.writer = writer
         self.visited = set()
 
+    def sample_science_product(self, product_locator: str) -> RowWriter:
+        """
+        Get metadata from the archive database for a certain science product locator
+
+        :param product_locator: SPL of interest
+        :return:
+        """
+
+        # the first time through, we select from the projects table and get that row
+        projects = self.table("science_products")
+        requested = projects.fetch({"science_product_locator": science_product_locator})
+        self.save(requested)
+        self.writer.close()
+        return self.writer
+
     def sample_project(self, project_code: str) -> RowWriter:
         """
         Get project metadata from the archive database.