Link back to builds when comparing

lib/builder_web.ml

@@ -263,22 +263,27 @@ let routes t =
       Response.of_plain_text "Bad request" ~status:`Bad_request
       |> Lwt.return
     | Some build_left, Some build_right ->
-      let+ switch_left =
+      let+ r =
         Caqti_lwt.Pool.use (Model.build_artifact build_left (Fpath.v "opam-switch"))
-          t.pool
-      and+ switch_right =
+          t.pool >>= fun switch_left ->
         Caqti_lwt.Pool.use (Model.build_artifact build_right (Fpath.v "opam-switch"))
-          t.pool
+          t.pool >>= fun switch_right ->
+        Caqti_lwt.Pool.use (Model.build build_left) t.pool >>= fun (_id, build_left) ->
+        Caqti_lwt.Pool.use (Model.build build_right) t.pool >>= fun (_id, build_right) ->
+        Caqti_lwt.Pool.use (Model.job_name build_left.job_id) t.pool >>= fun job_left ->
+        Caqti_lwt.Pool.use (Model.job_name build_right.job_id) t.pool >>= fun job_right ->
+        Lwt_result.return (job_left, job_right, build_left, build_right, switch_left, switch_right)
       in
-      match switch_left, switch_right with
-      | Error e, _ | _, Error e ->
-         Log.warn (fun m -> m "Database error: %a" pp_error e);
-         Response.of_plain_text "Internal server error\n" ~status:`Internal_server_error
-      | Ok (switch_left, _sha256_left), Ok (switch_right, _sha256_right) ->
+      match r with
+      | Error e ->
+        Log.warn (fun m -> m "Database error: %a" pp_error e);
+        Response.of_plain_text "Internal server error\n" ~status:`Internal_server_error
+      | Ok (job_left, job_right, build_left, build_right,
+            (switch_left, _sha256_left), (switch_right, _sha256_right)) ->
         let switch_left = OpamFile.SwitchExport.read_from_string switch_left
         and switch_right = OpamFile.SwitchExport.read_from_string switch_right in
         Opamdiff.compare switch_left switch_right
-        |> Views.compare_opam build_left build_right
+        |> Views.compare_opam job_left job_right build_left build_right
         |> Response.of_html
   in
 

lib/model.ml

@@ -72,6 +72,9 @@ let job job (module Db : CONN) =
 let jobs (module Db : CONN) =
   Db.collect_list Builder_db.Job.get_all ()
 
+let job_name id (module Db : CONN) =
+  Db.find Builder_db.Job.get id
+
 let user username (module Db : CONN) =
   Db.find_opt Builder_db.User.get_user username >|=
   Option.map snd

lib/model.mli

@@ -34,6 +34,9 @@ val job : string -> Caqti_lwt.connection ->
 val jobs : Caqti_lwt.connection ->
   ((Builder_db.id * string) list, [> error ]) result Lwt.t
 
+val job_name : Builder_db.id -> Caqti_lwt.connection ->
+  (string, [> error ]) result Lwt.t
+
 val user : string -> Caqti_lwt.connection ->
   (Builder_web_auth.scrypt Builder_web_auth.user_info option, [> error ]) result Lwt.t
 

lib/views.ml

@@ -226,14 +226,26 @@ let package_diffs diffs =
       ])
     diffs
 
-let compare_opam build_left build_right (same, opam_diff, version_diff, left, right) =
+let compare_opam job_left job_right
+    (build_left : Builder_db.Build.t) (build_right : Builder_db.Build.t)
+    (same, opam_diff, version_diff, left, right) =
   layout ~title:(Fmt.strf "Comparing opam switches between builds %a and %a"
-                   Uuidm.pp build_left Uuidm.pp build_right)
+                   Uuidm.pp build_left.uuid Uuidm.pp build_right.uuid)
     [
       h1 [txt "Comparing opam switches"];
       h2 [
-        txtf "Builds %a and %a"
-          Uuidm.pp build_left Uuidm.pp build_right
+        txt "Builds ";
+        a ~a:[a_href
+               (Fmt.strf "/job/%s/build/%a/"
+                  job_left
+                  Uuidm.pp build_left.uuid)]
+          [txtf "%a" Uuidm.pp build_left.uuid];
+        txt " and ";
+        a ~a:[a_href
+               (Fmt.strf "/job/%s/build/%a/"
+                  job_right
+                  Uuidm.pp build_right.uuid)]
+          [txtf "%a" Uuidm.pp build_right.uuid];
       ];
       ul [
         li [