mirror of
https://github.com/prometheus/prometheus.git
synced 2024-09-23 17:27:36 -07:00
8fdfa8abea
i) Uses the more idiomatic Wrap and Wrapf methods for creating nested errors. ii) Fixes some incorrect usages of fmt.Errorf where the error messages don't have any formatting directives. iii) Does away with the use of fmt package for errors in favour of pkg/errors Signed-off-by: tariqibrahim <tariq181290@gmail.com>
197 lines
6.3 KiB
Go
197 lines
6.3 KiB
Go
// Copyright 2017 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package openstack
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import (
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"context"
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"fmt"
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"net"
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"github.com/go-kit/kit/log"
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"github.com/go-kit/kit/log/level"
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"github.com/gophercloud/gophercloud"
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"github.com/gophercloud/gophercloud/openstack"
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"github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/floatingips"
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"github.com/gophercloud/gophercloud/openstack/compute/v2/servers"
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"github.com/gophercloud/gophercloud/pagination"
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"github.com/pkg/errors"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/discovery/targetgroup"
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"github.com/prometheus/prometheus/util/strutil"
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)
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const (
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openstackLabelPrefix = model.MetaLabelPrefix + "openstack_"
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openstackLabelAddressPool = openstackLabelPrefix + "address_pool"
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openstackLabelInstanceID = openstackLabelPrefix + "instance_id"
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openstackLabelInstanceName = openstackLabelPrefix + "instance_name"
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openstackLabelInstanceStatus = openstackLabelPrefix + "instance_status"
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openstackLabelInstanceFlavor = openstackLabelPrefix + "instance_flavor"
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openstackLabelPublicIP = openstackLabelPrefix + "public_ip"
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openstackLabelPrivateIP = openstackLabelPrefix + "private_ip"
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openstackLabelTagPrefix = openstackLabelPrefix + "tag_"
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)
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// InstanceDiscovery discovers OpenStack instances.
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type InstanceDiscovery struct {
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provider *gophercloud.ProviderClient
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authOpts *gophercloud.AuthOptions
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region string
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logger log.Logger
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port int
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allTenants bool
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}
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// NewInstanceDiscovery returns a new instance discovery.
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func newInstanceDiscovery(provider *gophercloud.ProviderClient, opts *gophercloud.AuthOptions,
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port int, region string, allTenants bool, l log.Logger) *InstanceDiscovery {
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if l == nil {
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l = log.NewNopLogger()
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}
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return &InstanceDiscovery{provider: provider, authOpts: opts,
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region: region, port: port, allTenants: allTenants, logger: l}
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}
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type floatingIPKey struct {
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id string
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fixed string
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}
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func (i *InstanceDiscovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
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i.provider.Context = ctx
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err := openstack.Authenticate(i.provider, *i.authOpts)
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if err != nil {
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return nil, errors.Wrap(err, "could not authenticate to OpenStack")
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}
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client, err := openstack.NewComputeV2(i.provider, gophercloud.EndpointOpts{
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Region: i.region,
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})
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if err != nil {
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return nil, errors.Wrap(err, "could not create OpenStack compute session")
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}
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// OpenStack API reference
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// https://developer.openstack.org/api-ref/compute/#list-floating-ips
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pagerFIP := floatingips.List(client)
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floatingIPList := make(map[floatingIPKey]string)
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floatingIPPresent := make(map[string]struct{})
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err = pagerFIP.EachPage(func(page pagination.Page) (bool, error) {
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result, err := floatingips.ExtractFloatingIPs(page)
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if err != nil {
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return false, errors.Wrap(err, "could not extract floatingips")
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}
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for _, ip := range result {
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// Skip not associated ips
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if ip.InstanceID == "" || ip.FixedIP == "" {
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continue
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}
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floatingIPList[floatingIPKey{id: ip.InstanceID, fixed: ip.FixedIP}] = ip.IP
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floatingIPPresent[ip.IP] = struct{}{}
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}
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return true, nil
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})
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if err != nil {
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return nil, err
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}
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// OpenStack API reference
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// https://developer.openstack.org/api-ref/compute/#list-servers
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opts := servers.ListOpts{
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AllTenants: i.allTenants,
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}
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pager := servers.List(client, opts)
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tg := &targetgroup.Group{
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Source: fmt.Sprintf("OS_" + i.region),
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}
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err = pager.EachPage(func(page pagination.Page) (bool, error) {
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if ctx.Err() != nil {
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return false, errors.Wrap(ctx.Err(), "could not extract instances")
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}
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instanceList, err := servers.ExtractServers(page)
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if err != nil {
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return false, errors.Wrap(err, "could not extract instances")
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}
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for _, s := range instanceList {
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if len(s.Addresses) == 0 {
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level.Info(i.logger).Log("msg", "Got no IP address", "instance", s.ID)
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continue
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}
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labels := model.LabelSet{
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openstackLabelInstanceID: model.LabelValue(s.ID),
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openstackLabelInstanceStatus: model.LabelValue(s.Status),
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openstackLabelInstanceName: model.LabelValue(s.Name),
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}
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id, ok := s.Flavor["id"].(string)
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if !ok {
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level.Warn(i.logger).Log("msg", "Invalid type for flavor id, expected string")
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continue
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}
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labels[openstackLabelInstanceFlavor] = model.LabelValue(id)
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for k, v := range s.Metadata {
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name := strutil.SanitizeLabelName(k)
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labels[openstackLabelTagPrefix+model.LabelName(name)] = model.LabelValue(v)
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}
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for pool, address := range s.Addresses {
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md, ok := address.([]interface{})
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if !ok {
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level.Warn(i.logger).Log("msg", "Invalid type for address, expected array")
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continue
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}
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if len(md) == 0 {
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level.Debug(i.logger).Log("msg", "Got no IP address", "instance", s.ID)
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continue
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}
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for _, address := range md {
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md1, ok := address.(map[string]interface{})
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if !ok {
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level.Warn(i.logger).Log("msg", "Invalid type for address, expected dict")
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continue
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}
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addr, ok := md1["addr"].(string)
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if !ok {
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level.Warn(i.logger).Log("msg", "Invalid type for address, expected string")
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continue
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}
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if _, ok := floatingIPPresent[addr]; ok {
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continue
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}
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lbls := make(model.LabelSet, len(labels))
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for k, v := range labels {
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lbls[k] = v
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}
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lbls[openstackLabelAddressPool] = model.LabelValue(pool)
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lbls[openstackLabelPrivateIP] = model.LabelValue(addr)
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if val, ok := floatingIPList[floatingIPKey{id: s.ID, fixed: addr}]; ok {
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lbls[openstackLabelPublicIP] = model.LabelValue(val)
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}
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addr = net.JoinHostPort(addr, fmt.Sprintf("%d", i.port))
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lbls[model.AddressLabel] = model.LabelValue(addr)
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tg.Targets = append(tg.Targets, lbls)
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}
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}
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}
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return true, nil
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})
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if err != nil {
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return nil, err
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}
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return []*targetgroup.Group{tg}, nil
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}
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