forked from prometheus/prometheus
-
Notifications
You must be signed in to change notification settings - Fork 1
/
instance.go
215 lines (198 loc) · 6.4 KB
/
instance.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
// Copyright 2017 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package openstack
import (
"context"
"fmt"
"net"
"time"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/gophercloud/gophercloud"
"github.com/gophercloud/gophercloud/openstack"
"github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/floatingips"
"github.com/gophercloud/gophercloud/openstack/compute/v2/servers"
"github.com/gophercloud/gophercloud/pagination"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/discovery/targetgroup"
"github.com/prometheus/prometheus/util/strutil"
)
const (
openstackLabelPrefix = model.MetaLabelPrefix + "openstack_"
openstackLabelInstanceID = openstackLabelPrefix + "instance_id"
openstackLabelInstanceName = openstackLabelPrefix + "instance_name"
openstackLabelInstanceStatus = openstackLabelPrefix + "instance_status"
openstackLabelInstanceFlavor = openstackLabelPrefix + "instance_flavor"
openstackLabelPublicIP = openstackLabelPrefix + "public_ip"
openstackLabelPrivateIP = openstackLabelPrefix + "private_ip"
openstackLabelTagPrefix = openstackLabelPrefix + "tag_"
)
// InstanceDiscovery discovers OpenStack instances.
type InstanceDiscovery struct {
authOpts *gophercloud.AuthOptions
region string
interval time.Duration
logger log.Logger
port int
}
// NewInstanceDiscovery returns a new instance discovery.
func NewInstanceDiscovery(opts *gophercloud.AuthOptions,
interval time.Duration, port int, region string, l log.Logger) *InstanceDiscovery {
if l == nil {
l = log.NewNopLogger()
}
return &InstanceDiscovery{authOpts: opts,
region: region, interval: interval, port: port, logger: l}
}
// Run implements the Discoverer interface.
func (i *InstanceDiscovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
// Get an initial set right away.
tg, err := i.refresh()
if err != nil {
level.Error(i.logger).Log("msg", "Unable to refresh target groups", "err", err.Error())
} else {
select {
case ch <- []*targetgroup.Group{tg}:
case <-ctx.Done():
return
}
}
ticker := time.NewTicker(i.interval)
defer ticker.Stop()
for {
select {
case <-ticker.C:
tg, err := i.refresh()
if err != nil {
level.Error(i.logger).Log("msg", "Unable to refresh target groups", "err", err.Error())
continue
}
select {
case ch <- []*targetgroup.Group{tg}:
case <-ctx.Done():
return
}
case <-ctx.Done():
return
}
}
}
func (i *InstanceDiscovery) refresh() (*targetgroup.Group, error) {
var err error
t0 := time.Now()
defer func() {
refreshDuration.Observe(time.Since(t0).Seconds())
if err != nil {
refreshFailuresCount.Inc()
}
}()
provider, err := openstack.AuthenticatedClient(*i.authOpts)
if err != nil {
return nil, fmt.Errorf("could not create OpenStack session: %s", err)
}
client, err := openstack.NewComputeV2(provider, gophercloud.EndpointOpts{
Region: i.region,
})
if err != nil {
return nil, fmt.Errorf("could not create OpenStack compute session: %s", err)
}
// OpenStack API reference
// https://developer.openstack.org/api-ref/compute/#list-floating-ips
pagerFIP := floatingips.List(client)
floatingIPList := make(map[string][]string)
err = pagerFIP.EachPage(func(page pagination.Page) (bool, error) {
result, err := floatingips.ExtractFloatingIPs(page)
if err != nil {
return false, fmt.Errorf("could not extract floatingips: %s", err)
}
for _, ip := range result {
// Skip not associated ips
if ip.InstanceID != "" {
floatingIPList[ip.InstanceID] = append(floatingIPList[ip.InstanceID], ip.IP)
}
}
return true, nil
})
if err != nil {
return nil, err
}
// OpenStack API reference
// https://developer.openstack.org/api-ref/compute/#list-servers
opts := servers.ListOpts{}
pager := servers.List(client, opts)
tg := &targetgroup.Group{
Source: fmt.Sprintf("OS_" + i.region),
}
err = pager.EachPage(func(page pagination.Page) (bool, error) {
instanceList, err := servers.ExtractServers(page)
if err != nil {
return false, fmt.Errorf("could not extract instances: %s", err)
}
for _, s := range instanceList {
labels := model.LabelSet{
openstackLabelInstanceID: model.LabelValue(s.ID),
}
if len(s.Addresses) == 0 {
level.Info(i.logger).Log("msg", "Got no IP address", "instance", s.ID)
continue
}
for _, address := range s.Addresses {
md, ok := address.([]interface{})
if !ok {
level.Warn(i.logger).Log("msg", "Invalid type for address, expected array")
continue
}
if len(md) == 0 {
level.Debug(i.logger).Log("msg", "Got no IP address", "instance", s.ID)
continue
}
md1, ok := md[0].(map[string]interface{})
if !ok {
level.Warn(i.logger).Log("msg", "Invalid type for address, expected dict")
continue
}
addr, ok := md1["addr"].(string)
if !ok {
level.Warn(i.logger).Log("msg", "Invalid type for address, expected string")
continue
}
labels[openstackLabelPrivateIP] = model.LabelValue(addr)
addr = net.JoinHostPort(addr, fmt.Sprintf("%d", i.port))
labels[model.AddressLabel] = model.LabelValue(addr)
// Only use first private IP
break
}
if val, ok := floatingIPList[s.ID]; ok && len(val) > 0 {
labels[openstackLabelPublicIP] = model.LabelValue(val[0])
}
labels[openstackLabelInstanceStatus] = model.LabelValue(s.Status)
labels[openstackLabelInstanceName] = model.LabelValue(s.Name)
id, ok := s.Flavor["id"].(string)
if !ok {
level.Warn(i.logger).Log("msg", "Invalid type for instance id, excepted string")
continue
}
labels[openstackLabelInstanceFlavor] = model.LabelValue(id)
for k, v := range s.Metadata {
name := strutil.SanitizeLabelName(k)
labels[openstackLabelTagPrefix+model.LabelName(name)] = model.LabelValue(v)
}
tg.Targets = append(tg.Targets, labels)
}
return true, nil
})
if err != nil {
return nil, err
}
return tg, nil
}