forked from go-graphite/carbonapi
-
Notifications
You must be signed in to change notification settings - Fork 1
/
auto_group.go
241 lines (203 loc) · 7.25 KB
/
auto_group.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
package auto
import (
"context"
"net/http"
"net/url"
"time"
"github.com/ansel1/merry"
protov3 "github.com/go-graphite/protocol/carbonapi_v3_pb"
"go.uber.org/zap"
"github.com/grafana/carbonapi/internal/dns"
"github.com/grafana/carbonapi/limiter"
"github.com/grafana/carbonapi/zipper/broadcast"
"github.com/grafana/carbonapi/zipper/helper"
"github.com/grafana/carbonapi/zipper/httpHeaders"
"github.com/grafana/carbonapi/zipper/metadata"
"github.com/grafana/carbonapi/zipper/types"
)
func init() {
aliases := []string{"auto"}
metadata.Metadata.Lock()
for _, name := range aliases {
metadata.Metadata.SupportedProtocols[name] = struct{}{}
metadata.Metadata.ProtocolInits[name] = New
metadata.Metadata.ProtocolInitsWithLimiter[name] = NewWithLimiter
}
defer metadata.Metadata.Unlock()
}
type capabilityResponse struct {
server string
protocol string
}
//_internal/capabilities/
func doQuery(ctx context.Context, logger *zap.Logger, groupName string, httpClient *http.Client, limiter limiter.ServerLimiter, server string, request types.Request, resChan chan<- capabilityResponse) {
httpQuery := helper.NewHttpQuery(groupName, []string{server}, 1, limiter, httpClient, httpHeaders.ContentTypeCarbonAPIv3PB)
rewrite, _ := url.Parse("http://127.0.0.1/_internal/capabilities/")
res, e := httpQuery.DoQuery(ctx, logger, rewrite.RequestURI(), request)
if e != nil || res == nil || res.Response == nil || len(res.Response) == 0 {
logger.Info("will assume old protocol")
resChan <- capabilityResponse{
server: server,
protocol: "protobuf",
}
return
}
response := protov3.CapabilityResponse{}
logger.Debug("response",
zap.String("server", res.Server),
zap.String("response", string(res.Response)),
)
err := response.Unmarshal(res.Response)
if err != nil {
resChan <- capabilityResponse{
server: server,
protocol: "protobuf",
}
return
}
resChan <- capabilityResponse{
server: server,
protocol: response.SupportedProtocols[0],
}
}
type CapabilityResponse struct {
ProtoToServers map[string][]string
}
func getBestSupportedProtocol(logger *zap.Logger, servers []string) *CapabilityResponse {
response := &CapabilityResponse{
ProtoToServers: make(map[string][]string),
}
groupName := "capability query"
l := limiter.NoopLimiter{}
httpClient := &http.Client{
Transport: &http.Transport{
DialContext: dns.GetDialContextWithTimeout(200*time.Millisecond, 30*time.Second),
},
}
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
request := types.CapabilityRequestV3{}
resCh := make(chan capabilityResponse, len(servers))
for _, srv := range servers {
go doQuery(ctx, logger, groupName, httpClient, l, srv, request, resCh)
}
answeredServers := make(map[string]struct{})
responseCounts := 0
GATHER:
for {
if responseCounts == len(servers) && len(resCh) == 0 {
break GATHER
}
select {
case res := <-resCh:
responseCounts++
answeredServers[res.server] = struct{}{}
if res.protocol == "" {
return nil
}
p := response.ProtoToServers[res.protocol]
response.ProtoToServers[res.protocol] = append(p, res.server)
case <-ctx.Done():
noAnswer := make([]string, 0)
for _, s := range servers {
if _, ok := answeredServers[s]; !ok {
noAnswer = append(noAnswer, s)
}
}
logger.Warn("timeout waiting for more responses",
zap.Strings("no_answers_from", noAnswer),
)
break GATHER
}
}
return response
}
type AutoGroup struct {
groupName string
}
func NewWithLimiter(logger *zap.Logger, config types.BackendV2, tldCacheDisabled bool, limiter limiter.ServerLimiter) (types.BackendServer, merry.Error) {
return nil, merry.New("auto group doesn't support anything useful except for New")
}
func New(logger *zap.Logger, config types.BackendV2, tldCacheDisabled bool) (types.BackendServer, merry.Error) {
logger = logger.With(zap.String("type", "autoGroup"), zap.String("name", config.GroupName))
if config.ConcurrencyLimit == nil {
logger.Error("this behavior changes in 0.14.0, before that there was an implied concurrencyLimit of 100 for the backend. Currently it's required to specify this limit for auto backend as well.")
return nil, types.ErrConcurrencyLimitNotSet
}
res := getBestSupportedProtocol(logger, config.Servers)
if res == nil {
return nil, merry.New("can't query all backend")
}
var backends []types.BackendServer
for proto, servers := range res.ProtoToServers {
metadata.Metadata.RLock()
backendInit, ok := metadata.Metadata.ProtocolInits[proto]
metadata.Metadata.RUnlock()
if !ok {
var protocols []string
metadata.Metadata.RLock()
for p := range metadata.Metadata.SupportedProtocols {
protocols = append(protocols, p)
}
metadata.Metadata.RUnlock()
logger.Error("unknown backend protocol",
zap.Any("backend", config),
zap.String("requested_protocol", proto),
zap.Strings("supported_backends", protocols),
)
return nil, merry.New("unknown backend protocol").WithValue("protocol", proto)
}
cfg := config
cfg.GroupName = config.GroupName + "_" + proto
cfg.Servers = servers
c, ePtr := backendInit(logger, cfg, tldCacheDisabled)
if ePtr != nil {
return nil, ePtr
}
backends = append(backends, c)
}
return broadcast.New(
broadcast.WithLogger(logger),
broadcast.WithGroupName(config.GroupName+"_broadcast"),
broadcast.WithSplitMultipleRequests(config.DoMultipleRequestsIfSplit),
broadcast.WithBackends(backends),
broadcast.WithPathCache(600),
broadcast.WithLimiter(*config.ConcurrencyLimit),
broadcast.WithMaxMetricsPerRequest(*config.MaxBatchSize),
broadcast.WithTimeouts(*config.Timeouts),
broadcast.WithTLDCache(!tldCacheDisabled),
)
}
func (c AutoGroup) MaxMetricsPerRequest() int {
return -1
}
func (c AutoGroup) Name() string {
return c.groupName
}
func (c AutoGroup) Backends() []string {
return nil
}
func (c *AutoGroup) Fetch(ctx context.Context, request *protov3.MultiFetchRequest) (*protov3.MultiFetchResponse, *types.Stats, merry.Error) {
return nil, nil, merry.New("auto group doesn't support fetch")
}
func (c *AutoGroup) Find(ctx context.Context, request *protov3.MultiGlobRequest) (*protov3.MultiGlobResponse, *types.Stats, merry.Error) {
return nil, nil, merry.New("auto group doesn't support find")
}
func (c *AutoGroup) Info(ctx context.Context, request *protov3.MultiMetricsInfoRequest) (*protov3.ZipperInfoResponse, *types.Stats, merry.Error) {
return nil, nil, merry.New("auto group doesn't support info")
}
func (c *AutoGroup) List(ctx context.Context) (*protov3.ListMetricsResponse, *types.Stats, merry.Error) {
return nil, nil, merry.New("auto group doesn't support list")
}
func (c *AutoGroup) Stats(ctx context.Context) (*protov3.MetricDetailsResponse, *types.Stats, merry.Error) {
return nil, nil, merry.New("auto group doesn't support stats")
}
func (bg *AutoGroup) TagNames(ctx context.Context, prefix string, exprs []string, limit int64) ([]string, merry.Error) {
return nil, merry.New("auto group doesn't support tag names")
}
func (bg *AutoGroup) TagValues(ctx context.Context, tagName, prefix string, exprs []string, limit int64) ([]string, merry.Error) {
return nil, merry.New("auto group doesn't support tag values")
}
func (c *AutoGroup) ProbeTLDs(ctx context.Context) ([]string, merry.Error) {
return nil, merry.New("auto group doesn't support probing")
}