Export the calendar days map.

design/api.md

@@ -66,12 +66,48 @@ Example response:
 ### `/cameras/<uuid>`
 
 A GET returns information for the camera with the given URL. The information
-returned is a superset of that returned by the camera list.
+returned is a superset of that returned by the camera list. It also includes a
+list of calendar days (in the server's time zone) with data in the server's
+time zone. The `days` entry is a object mapping `YYYY-mm-dd` to a day object
+with the following attributes:
 
-TODO(slamb): this should likely return a list of calendar days with data in the
+*   `total_duration_90k` is the total duration recorded during that day.
-server's time zone, along with the associated `start\_time\_90k` and
+    If a recording spans a day boundary, some portion of it is accounted to
-`end\_time\_90k`. The server will calculate this on startup and maintain it
+    each day.
-as recordings are updated.
+*   `start_time_90k` is the start of that calendar day in the server's time
+    zone.
+*   `end_time_90k` is the end of that calendar day in the server's time zone.
+    It is usually 24 hours after the start time. It might be 23 hours or 25
+    hours during spring forward or fall back, respectively.
+
+A calendar day will be present in the `days` object iff there is a non-zero
+total duration of recordings for that day.
+
+Example response:
+
+```json
+{
+  "days": {
+    "2016-05-01": {
+      "end_time_usec": 131595516000000,
+      "start_time_usec": 131587740000000,
+      "total_duration_90k": 52617609
+    },
+    "2016-05-02": {
+      "end_time_usec": 131603292000000,
+      "start_time_usec": 131595516000000,
+      "total_duration_90k": 20946022
+    }
+  },
+  "description":"",
+  "max_end_time_90k": 131598273666690,
+  "min_start_time_90k": 131590386129355,
+  "retain_bytes": 104857600,
+  "short_name": "driveway",
+  "total_duration_90k": 73563631,
+  "total_sample_file_bytes": 98901406,
+}
+```
 
 ### `/camera/<uuid>/recordings`
 

src/web.cc

@@ -285,16 +285,34 @@ void WebInterface::HandleJsonCameraDetail(evhttp_request *req,
       static_cast<Json::Int64>(camera_row.total_duration_90k);
   camera["total_sample_file_bytes"] =
       static_cast<Json::Int64>(camera_row.total_sample_file_bytes);
-  if (camera_row.min_start_time_90k != -1) {
+  if (camera_row.min_start_time_90k != std::numeric_limits<int64_t>::max()) {
     camera["min_start_time_90k"] =
         static_cast<Json::Int64>(camera_row.min_start_time_90k);
   }
-  if (camera_row.max_end_time_90k != -1) {
+  if (camera_row.max_end_time_90k != std::numeric_limits<int64_t>::min()) {
     camera["max_end_time_90k"] =
         static_cast<Json::Int64>(camera_row.max_end_time_90k);
   }
 
-  // TODO(slamb): include list of calendar days with data.
+  Json::Value days(Json::objectValue);
+  std::string error_message;
+  for (const auto &day : camera_row.days) {
+    int64_t start_time_usec;
+    int64_t end_time_usec;
+    if (!GetDayBounds(day.first, &start_time_usec, &end_time_usec,
+                      &error_message)) {
+      return evhttp_send_error(
+          req, HTTP_INTERNAL,
+          StrCat("internal error: ", EscapeHtml(error_message)).c_str());
+    }
+
+    Json::Value day_val(Json::objectValue);
+    day_val["start_time_usec"] = static_cast<Json::Int64>(start_time_usec);
+    day_val["end_time_usec"] = static_cast<Json::Int64>(end_time_usec);
+    day_val["total_duration_90k"] = static_cast<Json::Int64>(day.second);
+    days[day.first] = day_val;
+  }
+  camera["days"] = days;
   ReplyWithJson(req, camera);
 }