Add an endpoint to query a dataset's git history from it's id.

* gn3/api/metadata.py: Import get_history.
(view_history): New endpoint.
* gn3/db/datasets.py (get_history): New function.

Signed-off-by: Munyoki Kilyungi <me@bonfacemunyoki.com>

1 files changed, 22 insertions, 1 deletions

diff --git a/gn3/api/metadata.py b/gn3/api/metadata.py
index fe7e903..a6a88fc 100644
--- a/gn3/api/metadata.py
+++ b/gn3/api/metadata.py
@@ -7,7 +7,8 @@ from flask import request
 from flask import current_app
 
 from gn3.db.datasets import (retrieve_metadata,
-                             save_dataset_metadata)
+                             save_metadata,
+                             get_history)
 from gn3.db.rdf import RDF_PREFIXES
 from gn3.db.rdf import (query_frame_and_compact,
                         query_and_compact,
@@ -263,6 +264,26 @@ CONSTRUCT {
     )
 
 
+@metadata.route("/datasets/<id_>/history")
+def view_history(id_):
+    history = get_history(
+        git_dir=Path(current_app.config.get("DATA_DIR"),
+                     "gn-docs"),
+        name=id_,
+    ).either(
+        lambda error: {
+            "error": "Unable to fetch history",
+            "error_description": error,
+        },
+        lambda history: {
+            "id": id_,
+            "history": history,
+        })
+    if history.get("error"):
+        raise Exception(history.get("error_description"))
+    return history
+
+
 @metadata.route("/datasets/search/<term>", methods=["GET"])
 def search_datasets(term):
     """Search datasets"""