From 07841bd2ec86cb667aea633de5dcb068751e64d3 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Mon, 15 Oct 2018 17:29:05 +0200
Subject: Friends list (beginning)

---
 shard/lib/app/directory.ex | 45 ++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 42 insertions(+), 3 deletions(-)

(limited to 'shard')

diff --git a/shard/lib/app/directory.ex b/shard/lib/app/directory.ex
index f7d871a..55413c4 100644
--- a/shard/lib/app/directory.ex
+++ b/shard/lib/app/directory.ex
@@ -42,10 +42,12 @@ defmodule SApp.Directory do
     end
     SNet.Group.init_lookup(netgroup, self())
 
+    revfiles = for {n, m} <- SData.SignRev.get(files), into: %{}, do: {m, n}
+
     {:ok, %{
       owner: owner, public: public, name: name,
       manifest: manifest, id: id, netgroup: netgroup,
-      files: files}}
+      files: files, revfiles: revfiles}}
   end
 
   def handle_call(:manifest, _from, state) do
@@ -66,7 +68,10 @@ defmodule SApp.Directory do
         GenServer.cast(Shard.Manager, {:dep_list, state.id, Map.values(dict)})
         {:ok, st2} = SData.SignRev.set(state.files, dict, state.owner)
         Shard.Manager.save_state(state.id, st2)
-        state = put_in(state.files, st2)
+        state = %{state |
+          files: st2,
+          revfiles: Map.put(state.revfiles, manifest, name)
+        }
         bcast_state(state)
         {:reply, :ok, state}
       end
@@ -81,6 +86,7 @@ defmodule SApp.Directory do
       if dict[name] == nil do
         {:reply, :not_found, state}
       else
+        state = put_in(state.revfiles, Map.delete(state.revfiles, dict[name]))
         dict = Map.delete(dict, name)
         GenServer.cast(Shard.Manager, {:dep_list, state.id, Map.values(dict)})
         {:ok, st2} = SData.SignRev.set(state.files, dict, state.owner)
@@ -94,6 +100,15 @@ defmodule SApp.Directory do
     end
   end
 
+  def handle_call({:read, name}, _from, state) do
+    dict = SData.SignRev.get(state.files)
+    {:reply, dict[name], state}
+  end
+
+  def handle_call({:find, manifest}, _from, state) do
+    {:reply, state.revfiles[manifest], state}
+  end
+
   def handle_cast(:send_deps, state) do
     dict = SData.SignRev.get(state.files)
     GenServer.cast(Shard.Manager, {:dep_list, state.id, Map.values(dict)})
@@ -144,12 +159,28 @@ defmodule SApp.Directory do
   @doc"""
   Return list of files stored in this directory.
 
-  Returns a list of {name, manifests}.
+  Returns a dictionnary of %{name => manifest}.
   """
   def get_files(pid) do
     GenServer.call(pid, :get_files)
   end
 
+  @doc"""
+  Return the manifest of file with a given name in directory, or nil if not found.
+  
+  Equivalent to get_files(pid)[name] but better.
+  """
+  def read(pid, name) do
+    GenServer.call(pid, {:read, name})
+  end
+
+  @doc"""
+  Find a file in the directory by its manifest. Returns name if found or nil if not found.
+  """
+  def find(pid, manifest) do
+    GenServer.call(pid, {:find, manifest})
+  end
+
   @doc"""
   Add a file to this directory. A file is a name for a shard manifest.
   A file added to a directory becomes a dependency of the directory, i.e.
@@ -165,4 +196,12 @@ defmodule SApp.Directory do
   def rm_file(pid, name) do
     GenServer.call(pid, {:rm_file, name})
   end
+
+  @doc"""
+  Returns the friends directory of a user
+  """
+  def friends_dir(pk) do
+    manifest = %Manifest{name: "friends", owner: pk, public: false}
+    Shard.Manager.find_or_start manifest
+  end
 end
-- 
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