-
Notifications
You must be signed in to change notification settings - Fork 5
/
server.go
462 lines (440 loc) · 12.1 KB
/
server.go
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
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
package basic
import "C"
import (
"context"
"fmt"
"net/http"
"runtime"
"sync"
"github.com/mohae/deepcopy"
"github.com/pkg/errors"
"github.com/rs/zerolog"
"k3l.io/go-eigentrust/pkg/sparse"
)
type StrictServerImpl struct {
logger zerolog.Logger
storedLocalTrust map[LocalTrustId]*sparse.Matrix
storedLocalTrustMtx sync.Mutex
}
func NewStrictServerImpl(logger zerolog.Logger) *StrictServerImpl {
return &StrictServerImpl{
logger: logger,
storedLocalTrust: make(map[LocalTrustId]*sparse.Matrix),
}
}
type HTTPError struct {
Code int
Inner error
}
func (e HTTPError) Error() string {
statusText := http.StatusText(e.Code)
if statusText != "" {
statusText = " " + statusText
}
return fmt.Sprintf("HTTP %d%s: %s", e.Code, statusText, e.Inner.Error())
}
func (server *StrictServerImpl) compute(
ctx context.Context, localTrustRef *LocalTrustRef,
initialTrust *TrustVectorRef, preTrust *TrustVectorRef,
alpha *float64, epsilon *float64,
flatTail *int, numLeaders *int,
maxIterations *int,
) (tv TrustVectorRef, flatTailStats FlatTailStats, err error) {
logger := server.logger.With().
Str("func", "(*StrictServerImpl).Compute").
Logger()
var (
c *sparse.Matrix
p *sparse.Vector
t0 *sparse.Vector
)
opts := []ComputeOpt{WithFlatTailStats(&flatTailStats)}
if c, err = server.loadLocalTrust(localTrustRef); err != nil {
err = HTTPError{400, errors.Wrap(err, "cannot load local trust")}
return
}
cDim, err := c.Dim()
if err != nil {
return
}
logger.Trace().
Int("dim", cDim).
Int("nnz", c.NNZ()).
Msg("local trust loaded")
if preTrust == nil {
// Default to zero pre-trust (canonicalized into uniform later).
p = sparse.NewVector(cDim, nil)
} else if p, err = loadTrustVector(preTrust); err != nil {
err = HTTPError{400, errors.Wrap(err, "cannot load pre-trust")}
return
} else {
// align dimensions
switch {
case p.Dim < cDim:
p.SetDim(cDim)
case cDim < p.Dim:
cDim = p.Dim
c.SetDim(p.Dim, p.Dim)
}
}
logger.Trace().
Int("dim", p.Dim).
Int("nnz", p.NNZ()).
Msg("pre-trust loaded")
if initialTrust == nil {
t0 = nil
} else if t0, err = loadTrustVector(initialTrust); err != nil {
err = HTTPError{400, errors.Wrap(err, "cannot load initial trust")}
return
} else {
// align dimensions
switch {
case t0.Dim < cDim:
t0.SetDim(cDim)
case cDim < t0.Dim:
cDim = t0.Dim
c.SetDim(t0.Dim, t0.Dim)
p.SetDim(t0.Dim)
}
logger.Trace().
Int("dim", t0.Dim).
Int("nnz", t0.NNZ()).
Msg("initial trust loaded")
opts = append(opts, WithInitialTrust(t0))
}
if alpha == nil {
a := 0.5
alpha = &a
} else if *alpha < 0 || *alpha > 1 {
err = HTTPError{
400, errors.Errorf("alpha=%f out of range [0..1]", *alpha),
}
return
}
if epsilon == nil {
e := 1e-6 / float64(cDim)
epsilon = &e
} else if *epsilon <= 0 || *epsilon > 1 {
err = HTTPError{
400, errors.Errorf("epsilon=%f out of range (0..1]", *epsilon),
}
return
}
if flatTail != nil {
opts = append(opts, WithFlatTail(*flatTail))
}
if numLeaders != nil {
opts = append(opts, WithFlatTailNumLeaders(*numLeaders))
}
if maxIterations != nil {
opts = append(opts, WithMaxIterations(*maxIterations))
}
CanonicalizeTrustVector(p)
if t0 != nil {
CanonicalizeTrustVector(t0)
}
err = CanonicalizeLocalTrust(c, p)
if err != nil {
err = HTTPError{
400, errors.Wrapf(err, "cannot canonicalize local trust"),
}
return
}
t, err := Compute(ctx, c, p, *alpha, *epsilon, opts...)
c = nil
p = nil
runtime.GC()
if err != nil {
err = errors.Wrapf(err, "cannot compute EigenTrust")
return
}
var itv InlineTrustVector
itv.Scheme = "inline" // FIXME(ek): can we not hard-code this?
itv.Size = t.Dim
for _, e := range t.Entries {
itv.Entries = append(itv.Entries,
InlineTrustVectorEntry{I: e.Index, V: e.Value})
}
if err = tv.FromInlineTrustVector(itv); err != nil {
err = errors.Wrapf(err, "cannot create response")
return
}
return tv, flatTailStats, nil
}
func (server *StrictServerImpl) Compute(
ctx context.Context, request ComputeRequestObject,
) (ComputeResponseObject, error) {
ctx = server.logger.WithContext(ctx)
tv, _, err := server.compute(ctx,
&request.Body.LocalTrust,
request.Body.InitialTrust, request.Body.PreTrust,
request.Body.Alpha, request.Body.Epsilon,
request.Body.FlatTail, request.Body.NumLeaders,
request.Body.MaxIterations)
if err != nil {
if httpError, ok := err.(HTTPError); ok {
switch httpError.Code {
case 400:
var resp Compute400JSONResponse
resp.Message = httpError.Inner.Error()
return resp, nil
}
}
return nil, err
}
return Compute200JSONResponse(tv), nil
}
func (server *StrictServerImpl) ComputeWithStats(
ctx context.Context, request ComputeWithStatsRequestObject,
) (ComputeWithStatsResponseObject, error) {
ctx = server.logger.WithContext(ctx)
tv, flatTailStats, err := server.compute(ctx,
&request.Body.LocalTrust,
request.Body.InitialTrust, request.Body.PreTrust,
request.Body.Alpha, request.Body.Epsilon,
request.Body.FlatTail, request.Body.NumLeaders,
request.Body.MaxIterations)
if err != nil {
if httpError, ok := err.(HTTPError); ok {
switch httpError.Code {
case 400:
var resp ComputeWithStats400JSONResponse
resp.Message = httpError.Inner.Error()
return resp, nil
}
}
return nil, err
}
var resp ComputeWithStats200JSONResponse
resp.EigenTrust = tv
resp.FlatTailStats.Length = flatTailStats.Length
resp.FlatTailStats.Threshold = flatTailStats.Threshold
resp.FlatTailStats.DeltaNorm = flatTailStats.DeltaNorm
resp.FlatTailStats.Ranking = flatTailStats.Ranking
return resp, nil
}
func (server *StrictServerImpl) GetLocalTrust(
ctx context.Context, request GetLocalTrustRequestObject,
) (GetLocalTrustResponseObject, error) {
inline, err := server.getLocalTrust(ctx, request.Id)
if err != nil {
if httpError, ok := err.(HTTPError); ok {
switch httpError.Code {
case 404:
return GetLocalTrust404Response{}, nil
}
}
return nil, err
}
return GetLocalTrust200JSONResponse(*inline), nil
}
func (server *StrictServerImpl) getLocalTrust(
_ context.Context, id LocalTrustId,
) (*InlineLocalTrust, error) {
server.storedLocalTrustMtx.Lock()
defer server.storedLocalTrustMtx.Unlock()
c := server.storedLocalTrust[id]
if c == nil {
return nil, HTTPError{Code: 404}
}
cDim, err := c.Dim()
if err != nil {
return nil, errors.Wrapf(err, "cannot get dimension")
}
entries := make([]InlineLocalTrustEntry, 0, c.NNZ())
for i, row := range c.Entries {
for _, entry := range row {
entries = append(entries, InlineLocalTrustEntry{
I: i,
J: entry.Index,
V: entry.Value,
})
}
}
return &InlineLocalTrust{
Entries: entries,
Size: cDim,
}, nil
}
func (server *StrictServerImpl) HeadLocalTrust(
ctx context.Context, request HeadLocalTrustRequestObject,
) (HeadLocalTrustResponseObject, error) {
server.storedLocalTrustMtx.Lock()
defer server.storedLocalTrustMtx.Unlock()
if server.storedLocalTrust[request.Id] == nil {
return HeadLocalTrust404Response{}, nil
} else {
return HeadLocalTrust204Response{}, nil
}
}
func (server *StrictServerImpl) UpdateLocalTrust(
ctx context.Context, request UpdateLocalTrustRequestObject,
) (UpdateLocalTrustResponseObject, error) {
logger := server.logger.With().
Str("func", "(*StrictServerImpl).UpdateLocalTrust").
Str("localTrustId", request.Id).
Logger()
c, err := server.loadLocalTrust(request.Body)
if err != nil {
return nil, HTTPError{400, errors.Wrap(err, "cannot load local trust")}
}
cDim, err := c.Dim()
if err != nil {
return nil, errors.Wrap(err, "cannot get dimension")
}
logger.Trace().
Int("dim", cDim).
Int("nnz", c.NNZ()).
Msg("local trust loaded")
var created bool
if request.Params.Merge != nil && *request.Params.Merge {
c, created = server.mergeStoredLocalTrust(request.Id, c)
} else {
created = server.setStoredLocalTrust(request.Id, c)
}
err = c.Mmap(ctx)
if err != nil {
logger.Err(err).Msg("cannot swap out local trust")
}
if created {
return UpdateLocalTrust201Response{}, nil
} else {
return UpdateLocalTrust200Response{}, nil
}
}
func (server *StrictServerImpl) DeleteLocalTrust(
ctx context.Context, request DeleteLocalTrustRequestObject,
) (DeleteLocalTrustResponseObject, error) {
if !server.deleteStoredLocalTrust(request.Id) {
return DeleteLocalTrust404Response{}, nil
}
return DeleteLocalTrust204Response{}, nil
}
func (server *StrictServerImpl) loadLocalTrust(
ref *LocalTrustRef,
) (*sparse.Matrix, error) {
switch ref.Scheme {
case "inline":
inline, err := ref.AsInlineLocalTrust()
if err != nil {
return nil, errors.Wrapf(err,
"cannot parse inline local trust reference")
}
return server.loadInlineLocalTrust(&inline)
case "stored":
stored, err := ref.AsStoredLocalTrust()
if err != nil {
return nil, errors.Wrapf(err,
"cannot parse stored local trust reference")
}
return server.loadStoredLocalTrust(&stored)
default:
return nil, errors.Errorf("unknown local trust ref type %#v", ref.Scheme)
}
}
func (server *StrictServerImpl) loadInlineLocalTrust(
inline *InlineLocalTrust,
) (*sparse.Matrix, error) {
if inline.Size <= 0 {
return nil, errors.Errorf("invalid size=%#v", inline.Size)
}
var entries []sparse.CooEntry
for idx, entry := range inline.Entries {
if entry.I < 0 || entry.I >= inline.Size {
return nil, errors.Errorf("entry %d: i=%d is out of range [0..%d)",
idx, entry.I, inline.Size)
}
if entry.J < 0 || entry.J >= inline.Size {
return nil, errors.Errorf("entry %d: j=%d is out of range [0..%d)",
idx, entry.J, inline.Size)
}
if entry.V <= 0 {
return nil, errors.Errorf("entry %d: v=%f is out of range (0, inf)",
idx, entry.V)
}
entries = append(entries, sparse.CooEntry{
Row: entry.I,
Column: entry.J,
Value: entry.V,
})
}
// reset after move
size := inline.Size
inline.Size = 0
inline.Entries = nil
return sparse.NewCSRMatrix(size, size, entries), nil
}
func (server *StrictServerImpl) loadStoredLocalTrust(
stored *StoredLocalTrust,
) (*sparse.Matrix, error) {
server.storedLocalTrustMtx.Lock()
defer server.storedLocalTrustMtx.Unlock()
c, ok := server.storedLocalTrust[stored.Id]
if !ok {
return nil, HTTPError{400, errors.New("local trust not found")}
}
// Returned c is modified in-place (canonicalized, size-matched)
// so return a disposable copy, preserving the original.
// This is slow: It takes ~3s to copy 16M nonzero entries.
// TODO(ek): Implement on-demand canonicalization and remove this.
c = deepcopy.Copy(c).(*sparse.Matrix)
return c, nil
}
func loadTrustVector(ref *TrustVectorRef) (*sparse.Vector, error) {
if inline, err := ref.AsInlineTrustVector(); err == nil {
return loadInlineTrustVector(&inline)
}
return nil, errors.New("unknown trust vector type")
}
func loadInlineTrustVector(inline *InlineTrustVector) (*sparse.Vector, error) {
var entries []sparse.Entry
for idx, entry := range inline.Entries {
if entry.I < 0 || entry.I >= inline.Size {
return nil, errors.Errorf("entry %d: i=%d is out of range [0..%d)",
idx, entry.I, inline.Size)
}
if entry.V <= 0 {
return nil, errors.Errorf("entry %d: v=%f is out of range (0, inf)",
idx, entry.V)
}
entries = append(entries, sparse.Entry{Index: entry.I, Value: entry.V})
}
// reset after move
size := inline.Size
inline.Size = 0
inline.Entries = nil
return sparse.NewVector(size, entries), nil
}
func (server *StrictServerImpl) setStoredLocalTrust(
id LocalTrustId, c *sparse.Matrix,
) (created bool) {
server.storedLocalTrustMtx.Lock()
defer server.storedLocalTrustMtx.Unlock()
_, ok := server.storedLocalTrust[id]
server.storedLocalTrust[id] = c
return !ok
}
func (server *StrictServerImpl) mergeStoredLocalTrust(
id LocalTrustId, c *sparse.Matrix,
) (c2 *sparse.Matrix, created bool) {
server.storedLocalTrustMtx.Lock()
defer server.storedLocalTrustMtx.Unlock()
c2, ok := server.storedLocalTrust[id]
if ok {
c2.Merge(&c.CSMatrix)
} else {
server.storedLocalTrust[id] = c
}
return c2, !ok
}
func (server *StrictServerImpl) deleteStoredLocalTrust(
id LocalTrustId,
) (deleted bool) {
server.storedLocalTrustMtx.Lock()
defer server.storedLocalTrustMtx.Unlock()
if _, ok := server.storedLocalTrust[id]; ok {
delete(server.storedLocalTrust, id)
deleted = true
}
return
}