[couchdb] 09/16: Implement async API for `fabric2_fdb:get_info/1`

[da...@apache.org]

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davisp pushed a commit to branch prototype/fdb-layer-get-dbs-info
in repository https://gitbox.apache.org/repos/asf/couchdb.git

commit bde305dead63bc920618b7929832a01548c4a922
Author: Paul J. Davis <pa...@gmail.com>
AuthorDate: Tue Dec 3 12:44:34 2019 -0600

    Implement async API for `fabric2_fdb:get_info/1`
---
 src/fabric/src/fabric2_fdb.erl | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/fabric/src/fabric2_fdb.erl b/src/fabric/src/fabric2_fdb.erl
index 8bfbb74..0e7cba8 100644
--- a/src/fabric/src/fabric2_fdb.erl
+++ b/src/fabric/src/fabric2_fdb.erl
@@ -29,6 +29,8 @@
     list_dbs/4,
 
     get_info/1,
+    get_info_future/2,
+    get_info_wait/1,
     set_config/3,
 
     get_stat/2,
@@ -333,7 +335,10 @@ get_info(#{} = Db) ->
         tx := Tx,
         db_prefix := DbPrefix
     } = ensure_current(Db),
+    get_info_wait(get_info_future(Tx, DbPrefix)).
 
+
+get_info_future(Tx, DbPrefix) ->
     {CStart, CEnd} = erlfdb_tuple:range({?DB_CHANGES}, DbPrefix),
     ChangesFuture = erlfdb:get_range(Tx, CStart, CEnd, [
         {streaming_mode, exact},
@@ -344,6 +349,10 @@ get_info(#{} = Db) ->
     StatsPrefix = erlfdb_tuple:pack({?DB_STATS}, DbPrefix),
     MetaFuture = erlfdb:get_range_startswith(Tx, StatsPrefix),
 
+    {DbPrefix, ChangesFuture, MetaFuture}.
+
+
+get_info_wait({DbPrefix, ChangesFuture, MetaFuture}) ->
     RawSeq = case erlfdb:wait(ChangesFuture) of
         [] ->
             vs_to_seq(fabric2_util:seq_zero_vs());