From d8253db13c38e844c0d9d5580445675651879a2c Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@robocracy.org>
Date: Tue, 19 Jun 2018 19:19:57 -0700
Subject: implement more of stats endpoint

---
 rust/src/api_server.rs | 60 ++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 53 insertions(+), 7 deletions(-)

diff --git a/rust/src/api_server.rs b/rust/src/api_server.rs
index 7c84ad81..97ee93d6 100644
--- a/rust/src/api_server.rs
+++ b/rust/src/api_server.rs
@@ -119,7 +119,7 @@ macro_rules! count_entity {
         let count: i64 = $table::table
             .filter($table::is_live.eq(true))
             .filter($table::redirect_id.is_null())
-            .select(diesel::dsl::count($table::id))
+            .count()
             .first($conn)?;
         count
     }};
@@ -890,11 +890,57 @@ impl Server {
         Ok(entries)
     }
 
+    /// "more" parameter isn't used, but could be to indicate that "expensive" database queries
+    /// should be run
     fn get_stats_handler(&self, _more: Option<String>) -> Result<StatsResponse> {
         let conn = self.db_pool.get().expect("db_pool error");
 
         let merged_editgroups: i64 = changelog::table
-            .select(diesel::dsl::count(changelog::id))
+            .select(diesel::dsl::count_star())
+            .first(&conn)?;
+        let releases_with_dois: i64 = release_rev::table
+            .inner_join(release_ident::table)
+            .filter(release_rev::doi.is_not_null())
+            .filter(release_ident::is_live.eq(true))
+            .filter(release_ident::redirect_id.is_null())
+            .select(diesel::dsl::count_star())
+            .first(&conn)?;
+        let creators_with_orcids: i64 = creator_rev::table
+            .inner_join(creator_ident::table)
+            .filter(creator_rev::orcid.is_not_null())
+            .filter(creator_ident::is_live.eq(true))
+            .filter(creator_ident::redirect_id.is_null())
+            .select(diesel::dsl::count_star())
+            .first(&conn)?;
+        let containers_with_issnls: i64 = container_rev::table
+            .inner_join(container_ident::table)
+            .filter(container_rev::issnl.is_not_null())
+            .filter(container_ident::is_live.eq(true))
+            .filter(container_ident::redirect_id.is_null())
+            .count()
+            .first(&conn)?;
+
+        // these are probably expensive?
+        // this query is slightly inaccurate and over-counts: it includes files that have release
+        // links only to inactive releases
+        let files_with_releases: i64 = file_rev::table
+            .inner_join(file_ident::table)
+            .inner_join(file_release::table)
+            .filter(file_ident::is_live.eq(true))
+            .filter(file_ident::redirect_id.is_null())
+            .select(file_ident::id)
+            .distinct()
+            .count()
+            .first(&conn)?;
+        // this slightly overcounts also: it will include releases which are only linked to from
+        // inactive files
+        let releases_with_files: i64 = release_ident::table
+            .inner_join(file_release::table)
+            .filter(release_ident::is_live.eq(true))
+            .filter(release_ident::redirect_id.is_null())
+            .select(file_release::target_release_ident_id)
+            .distinct()
+            .count()
             .first(&conn)?;
 
         let val = json!({
@@ -906,11 +952,11 @@ impl Server {
                 "work": count_entity!(work_ident, &conn),
             },
             "merged_editgroups": merged_editgroups,
-            // TODO: "release_with_file": ,
-            // TODO: "release_with_doi": ,
-            // TODO: "creator_with_orcid": ,
-            // TODO: "files_with_release": ,
-            // TODO: "container_with_issnl": ,
+            "releases_with_dois": releases_with_dois,
+            "creators_with_orcids": creators_with_orcids,
+            "containers_with_issnls": containers_with_issnls,
+            "files_with_releases": files_with_releases,
+            "releases_with_files": releases_with_files,
         });
         Ok(StatsResponse { extra: Some(val) })
     }
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