Source file store_watch.ml
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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
open! Import
open Common
module type Sleep = sig
val sleep : float -> unit Lwt.t
end
module Make (Log : Logs.LOG) (Zzz : Sleep) (S : Generic_key) = struct
include Common.Make_helpers (S)
let sleep ?(sleep_t = 0.01) () =
let sleep_t = min sleep_t 1. in
Lwt.pause () >>= fun () -> Zzz.sleep sleep_t
let now_s () = Mtime.span_to_s (Mtime_clock.elapsed ())
let retry ?(timeout = 15.) ?(sleep_t = 0.) ~while_ fn =
let sleep_t = max sleep_t 0.001 in
let t = now_s () in
let str i = Fmt.str "%d, %.3fs" i (now_s () -. t) in
let rec aux i =
if now_s () -. t > timeout || not (while_ ()) then fn (str i);
try
fn (str i);
Lwt.return_unit
with ex ->
[%log.debug "retry ex: %s" (Printexc.to_string ex)];
let sleep_t = sleep_t *. (1. +. (float i ** 2.)) in
sleep ~sleep_t () >>= fun () ->
[%log.debug "Test.retry %s" (str i)];
aux (i + 1)
in
aux 0
let test_watch_exn x () =
let test repo =
let* t = S.main repo in
let* h = S.Head.find t in
let key = [ "a" ] in
let v1 = "bar" in
let v2 = "foo" in
let r = ref 0 in
let eq = Irmin.Type.(unstage (equal (Irmin.Diff.t (S.commit_t repo)))) in
let old_head = ref h in
let check x =
let+ h2 = S.Head.get t in
match !old_head with
| None -> if eq (`Added h2) x then incr r
| Some h -> if eq (`Updated (h, h2)) x then incr r
in
let* u =
S.watch ?init:h t (fun v -> check v >|= fun () -> failwith "test")
in
let* v =
S.watch ?init:h t (fun v -> check v >>= fun () -> Lwt.fail_with "test")
in
let* w = S.watch ?init:h t (fun v -> check v) in
S.set_exn t ~info:(infof "update") key v1 >>= fun () ->
let* () =
retry
~while_:(fun () -> !r < 3)
(fun n -> Alcotest.(check int) ("watch 1 " ^ n) 3 !r)
in
let* h = S.Head.find t in
old_head := h;
S.set_exn t ~info:(infof "update") key v2 >>= fun () ->
let* () =
retry
~while_:(fun () -> !r < 6)
(fun n -> Alcotest.(check int) ("watch 2 " ^ n) 6 !r)
in
S.unwatch u >>= fun () ->
S.unwatch v >>= fun () ->
S.unwatch w >>= fun () ->
let* h = S.Head.get t in
old_head := Some h;
let* u =
S.watch_key ~init:h t key (fun _ ->
incr r;
failwith "test")
in
let* v =
S.watch_key ~init:h t key (fun _ ->
incr r;
Lwt.fail_with "test")
in
let* w =
S.watch_key ~init:h t key (fun _ ->
incr r;
Lwt.return_unit)
in
S.set_exn t ~info:(infof "update") key v1 >>= fun () ->
let* () =
retry
~while_:(fun () -> !r < 9)
(fun n -> Alcotest.(check int) ("watch 3 " ^ n) 9 !r)
in
S.set_exn t ~info:(infof "update") key v2 >>= fun () ->
let* () =
retry
~while_:(fun () -> !r < 12)
(fun n -> Alcotest.(check int) ("watch 4 " ^ n) 12 !r)
in
S.unwatch u >>= fun () ->
S.unwatch v >>= fun () ->
S.unwatch w >>= fun () ->
Alcotest.(check unit) "ok!" () ();
B.Repo.close repo
in
run x test
let test_watches x () =
let pp_w ppf (p, w) = Fmt.pf ppf "%d/%d" p w in
let pp_s ppf = function
| None -> Fmt.string ppf "*"
| Some w -> pp_w ppf (w ())
in
let check_workers msg p w =
match x.stats with
| None -> Lwt.return_unit
| Some stats ->
retry
~while_:(fun _ -> true)
(fun s ->
let got = stats () in
let exp = (p, w) in
let msg = Fmt.str "workers: %s %a (%s)" msg pp_w got s in
if got = exp then line msg
else (
[%log.debug
"check-worker: expected %a, got %a" pp_w exp pp_w got];
Alcotest.failf "%s: %a / %a" msg pp_w got pp_w exp))
in
let module State = struct
type t = {
mutable adds : int;
mutable updates : int;
mutable removes : int;
}
let pp ppf { adds; updates; removes } =
Fmt.pf ppf "{ adds=%d; updates=%d; removes=%d }" adds updates removes
let empty () = { adds = 0; updates = 0; removes = 0 }
let add t =
[%log.debug "add %a" pp t];
t.adds <- t.adds + 1
let update t =
[%log.debug "update %a" pp t];
t.updates <- t.updates + 1
let remove t =
[%log.debug "remove %a" pp t];
t.removes <- t.removes + 1
let pretty ppf t = Fmt.pf ppf "%d/%d/%d" t.adds t.updates t.removes
let xpp ppf (a, u, r) = Fmt.pf ppf "%d/%d/%d" a u r
let xadd (a, u, r) = (a + 1, u, r)
let xupdate (a, u, r) = (a, u + 1, r)
let xremove (a, u, r) = (a, u, r + 1)
let less_than a b =
a.adds <= b.adds
&& a.updates <= b.updates
&& a.removes <= b.removes
&& not (a = b)
let check ?sleep_t msg (p, w) (a_adds, a_updates, a_removes) b =
let a = { adds = a_adds; updates = a_updates; removes = a_removes } in
check_workers msg p w >>= fun () ->
retry ?sleep_t
~while_:(fun () -> less_than b a )
(fun s ->
let msg = Fmt.str "state: %s (%s)" msg s in
if a = b then line msg
else Alcotest.failf "%s: %a / %a" msg pp a pp b)
let process ?sleep_t t head =
let* () =
match sleep_t with None -> Lwt.return_unit | Some s -> Zzz.sleep s
in
let () =
match head with
| `Added _ -> add t
| `Updated _ -> update t
| `Removed _ -> remove t
in
Lwt.return_unit
let apply msg state kind fn ?(first = false) on s n =
let msg mode n w s =
let kind =
match kind with
| `Add -> "add"
| `Update -> "update"
| `Remove -> "remove"
in
let mode =
match mode with `Pre -> "[pre-condition]" | `Post -> ""
in
Fmt.str "%s %s %s %d on=%b expected=%a:%a current=%a:%a" mode msg kind
n on xpp s pp_w w pretty state pp_s x.stats
in
let check mode n w s = check (msg mode n w s) w s state in
let incr =
match kind with
| `Add -> xadd
| `Update -> xupdate
| `Remove -> xremove
in
let rec aux pre = function
| 0 -> Lwt.return_unit
| i ->
let pre_w =
if on then (1, if i = n && first then 0 else 1) else (0, 0)
in
let post_w = if on then (1, 1) else (0, 0) in
let post = if on then incr pre else pre in
check `Pre (n - i) pre_w pre >>= fun () ->
[%log.debug "[waiting for] %s" (msg `Post (n - i) post_w post)];
fn (n - i) >>= fun () ->
check `Post (n - i) post_w post >>= fun () -> aux post (i - 1)
in
aux s n
end in
let test repo1 =
let* t1 = S.main repo1 in
let* repo = S.Repo.v x.config in
let* t2 = S.main repo in
[%log.debug "WATCH"];
let state = State.empty () in
let sleep_t = 0.02 in
let process = State.process ~sleep_t state in
let stops_0 = ref [] in
let stops_1 = ref [] in
let rec watch = function
| 0 -> Lwt.return_unit
| n ->
let t = if n mod 2 = 0 then t1 else t2 in
let* s = S.watch t process in
if n mod 2 = 0 then stops_0 := s :: !stops_0
else stops_1 := s :: !stops_1;
watch (n - 1)
in
let v1 = "X1" in
let v2 = "X2" in
S.set_exn t1 ~info:(infof "update") [ "a"; "b" ] v1 >>= fun () ->
S.Branch.remove repo1 S.Branch.main >>= fun () ->
State.check "init" (0, 0) (0, 0, 0) state >>= fun () ->
watch 100 >>= fun () ->
State.check "watches on" (1, 0) (0, 0, 0) state >>= fun () ->
S.set_exn t1 ~info:(infof "update") [ "a"; "b" ] v1 >>= fun () ->
State.check "watches adds" (1, 1) (100, 0, 0) state >>= fun () ->
S.set_exn t2 ~info:(infof "update") [ "a"; "c" ] v1 >>= fun () ->
State.check "watches updates" (1, 1) (100, 100, 0) state >>= fun () ->
S.Branch.remove repo S.Branch.main >>= fun () ->
State.check "watches removes" (1, 1) (100, 100, 100) state >>= fun () ->
Lwt_list.iter_s (fun f -> S.unwatch f) !stops_0 >>= fun () ->
S.set_exn t2 ~info:(infof "update") [ "a" ] v1 >>= fun () ->
State.check "watches half off" (1, 1) (150, 100, 100) state >>= fun () ->
Lwt_list.iter_s (fun f -> S.unwatch f) !stops_1 >>= fun () ->
S.set_exn t1 ~info:(infof "update") [ "a" ] v2 >>= fun () ->
State.check "watches off" (0, 0) (150, 100, 100) state >>= fun () ->
[%log.debug "WATCH-ALL"];
let state = State.empty () in
let* head = r1 ~repo in
let add =
State.apply "branch-watch-all" state `Add (fun n ->
let tag = Fmt.str "t%d" n in
S.Branch.set repo tag head)
in
let remove =
State.apply "branch-watch-all" state `Remove (fun n ->
let tag = Fmt.str "t%d" n in
S.Branch.remove repo tag)
in
let* main = S.Branch.get repo "main" in
let* u =
S.Branch.watch_all
~init:[ ("main", main) ]
repo
(fun _ -> State.process state)
in
add true (0, 0, 0) 10 ~first:true >>= fun () ->
remove true (10, 0, 0) 5 >>= fun () ->
S.unwatch u >>= fun () ->
add false (10, 0, 5) 4 >>= fun () ->
remove false (10, 0, 5) 4 >>= fun () ->
[%log.debug "WATCH-KEY"];
let state = State.empty () in
let path1 = [ "a"; "b"; "c" ] in
let path2 = [ "a"; "d" ] in
let path3 = [ "a"; "b"; "d" ] in
let add =
State.apply "branch-key" state `Add (fun _ ->
let v = "" in
S.set_exn t1 ~info:(infof "set1") path1 v >>= fun () ->
S.set_exn t1 ~info:(infof "set2") path2 v >>= fun () ->
S.set_exn t1 ~info:(infof "set3") path3 v >>= fun () ->
Lwt.return_unit)
in
let update =
State.apply "branch-key" state `Update (fun n ->
let v = string_of_int n in
S.set_exn t2 ~info:(infof "update1") path1 v >>= fun () ->
S.set_exn t2 ~info:(infof "update2") path2 v >>= fun () ->
S.set_exn t2 ~info:(infof "update3") path3 v >>= fun () ->
Lwt.return_unit)
in
let remove =
State.apply "branch-key" state `Remove (fun _ ->
S.remove_exn t1 ~info:(infof "remove1") path1 >>= fun () ->
S.remove_exn t1 ~info:(infof "remove2") path2 >>= fun () ->
S.remove_exn t1 ~info:(infof "remove3") path3 >>= fun () ->
Lwt.return_unit)
in
S.remove_exn t1 ~info:(infof "clean") [] >>= fun () ->
let* init = S.Head.get t1 in
let* u = S.watch_key t1 ~init path1 (State.process state) in
add true (0, 0, 0) 1 ~first:true >>= fun () ->
update true (1, 0, 0) 10 >>= fun () ->
remove true (1, 10, 0) 1 >>= fun () ->
S.unwatch u >>= fun () ->
add false (1, 10, 1) 3 >>= fun () ->
update false (1, 10, 1) 5 >>= fun () ->
remove false (1, 10, 1) 4 >>= fun () ->
[%log.debug "WATCH-MORE"];
let state = State.empty () in
let update =
State.apply "watch-more" state `Update (fun n ->
let v = string_of_int n in
let path1 = [ "a"; "b"; "c"; string_of_int n; "1" ] in
let path2 = [ "a"; "x"; "c"; string_of_int n; "1" ] in
let path3 = [ "a"; "y"; "c"; string_of_int n; "1" ] in
S.set_exn t2 ~info:(infof "update1") path1 v >>= fun () ->
S.set_exn t2 ~info:(infof "update2") path2 v >>= fun () ->
S.set_exn t2 ~info:(infof "update3") path3 v >>= fun () ->
Lwt.return_unit)
in
S.remove_exn t1 ~info:(infof "remove") [ "a" ] >>= fun () ->
S.set_exn t1 ~info:(infof "prepare") [ "a"; "b"; "c" ] "" >>= fun () ->
let* h = S.Head.get t1 in
let* u = S.watch_key t2 ~init:h [ "a"; "b" ] (State.process state) in
update true (0, 0, 0) 10 ~first:true >>= fun () ->
S.unwatch u >>= fun () ->
update false (0, 10, 0) 10 >>= fun () ->
B.Repo.close repo >>= fun () -> B.Repo.close repo1
in
run x test
let tests =
let _ = ("Basic operations", test_watches) in
[ ("Callbacks and exceptions", test_watch_exn) ]
end