1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
defmodule SApp.Directory do
@moduledoc"""
Shard application for a directory of other shards.
TODO: use MST for file list instead of plain list
"""
use GenServer
require Logger
defmodule Manifest do
@moduledoc"""
Manifest for a directory. This directory is owned by a user,
has a name, and can be either public or private.
"""
defstruct [:owner, :public, :name]
defimpl Shard.Manifest do
def module(_m), do: SApp.Directory
end
end
def start_link(manifest) do
GenServer.start_link(__MODULE__, manifest)
end
def init(manifest) do
%Manifest{owner: owner, public: public, name: name} = manifest
id = SData.term_hash manifest
Shard.Manager.dispatch_to(id, nil, self())
files = case Shard.Manager.load_state(id) do
nil ->
SData.SignRev.new %{}
st -> st
end
netgroup = case public do
true -> %SNet.PubShardGroup{id: id}
false -> %SNet.PrivGroup{pk_list: [owner]}
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, revfiles: revfiles}}
end
def handle_call(:manifest, _from, state) do
{:reply, state.manifest, state}
end
def handle_call(:get_files, _from, state) do
{:reply, SData.SignRev.get(state.files), state}
end
def handle_call({:add_file, name, manifest}, _from, state) do
if Shard.Keys.have_sk?(state.owner) do
dict = SData.SignRev.get(state.files)
if dict[name] != nil and dict[name] != manifest do
{:reply, :exists_already, state}
else
dict = Map.put(dict, name, manifest)
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 = %{state |
files: st2,
revfiles: Map.put(state.revfiles, manifest, name)
}
bcast_state(state)
{:reply, :ok, state}
end
else
{:reply, :impossible, state}
end
end
def handle_call({:rm_file, name}, _from, state) do
if Shard.Keys.have_sk?(state.owner) do
dict = SData.SignRev.get(state.files)
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)
Shard.Manager.save_state(state.id, st2)
state = put_in(state.files, st2)
bcast_state(state)
{:reply, :ok, state}
end
else
{:reply, :impossible, state}
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)})
{:noreply, state}
end
def handle_cast({:interested, peer_pid, auth}, state) do
if SNet.Group.in_group?(state.netgroup, peer_pid, auth) do
SNet.Manager.send_pid(peer_pid, {state.id, nil, {:update, SData.SignRev.signed(state.files), true}})
end
{:noreply, state}
end
def handle_cast({:msg, conn_pid, auth, _shard_id, nil, msg}, state) do
if not SNet.Group.in_group?(state.netgroup, conn_pid, auth) do
{:noreply, state}
else
state = case msg do
{:update, signed, ask_reply} when signed != nil ->
state = case SData.SignRev.merge(state.files, signed, state.pk) do
{true, newfiles} ->
Shard.Manager.save_state(state.id, newfiles)
state = put_in(state.files, newfiles)
bcast_state(state, [conn_pid])
state
{false, _} ->
state
end
if ask_reply do
SNet.Manager.send_pid(conn_pid, {state.id, nil, {:update, SData.SignRev.signed(state.files), false}})
end
state
_ -> state
end
{:noreply, state}
end
end
defp bcast_state(state, exclude \\ []) do
msg = {state.id, nil, {:update, SData.SignRev.signed(state.files), false}}
SNet.Group.broadcast(state.netgroup, msg, exclude_pid: exclude)
end
# ================
# PUBLIC INTERFACE
# ================
@doc"""
Return list of files stored in this directory.
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.
if the directory is pinned then all files inside are pinned as well.
"""
def add_file(pid, name, manifest) do
GenServer.call(pid, {:add_file, name, manifest})
end
@doc"""
Remove a named file from this directory.
"""
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
|
