alertmanager/client/client.go
beorn7 87ced08129 Update prometheus/client_golang to v1.0.0
Signed-off-by: beorn7 <beorn@grafana.com>
2019-06-17 18:12:21 +02:00

350 lines
9.3 KiB
Go

// Copyright 2018 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 client
import (
"bytes"
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
"time"
"github.com/prometheus/client_golang/api"
"github.com/prometheus/alertmanager/config"
"github.com/prometheus/alertmanager/types"
)
const (
apiPrefix = "/api/v1"
epStatus = apiPrefix + "/status"
epSilence = apiPrefix + "/silence/:id"
epSilences = apiPrefix + "/silences"
epAlerts = apiPrefix + "/alerts"
statusSuccess = "success"
statusError = "error"
)
// ServerStatus represents the status of the AlertManager endpoint.
type ServerStatus struct {
ConfigYAML string `json:"configYAML"`
ConfigJSON *config.Config `json:"configJSON"`
VersionInfo map[string]string `json:"versionInfo"`
Uptime time.Time `json:"uptime"`
ClusterStatus *ClusterStatus `json:"clusterStatus"`
}
// PeerStatus represents the status of a peer in the cluster.
type PeerStatus struct {
Name string `json:"name"`
Address string `json:"address"`
}
// ClusterStatus represents the status of the cluster.
type ClusterStatus struct {
Name string `json:"name"`
Status string `json:"status"`
Peers []PeerStatus `json:"peers"`
}
// apiClient wraps a regular client and processes successful API responses.
// Successful also includes responses that errored at the API level.
type apiClient struct {
api.Client
}
type apiResponse struct {
Status string `json:"status"`
Data json.RawMessage `json:"data,omitempty"`
ErrorType string `json:"errorType,omitempty"`
Error string `json:"error,omitempty"`
}
type clientError struct {
code int
msg string
}
func (e *clientError) Error() string {
return fmt.Sprintf("%s (code: %d)", e.msg, e.code)
}
func (c apiClient) Do(ctx context.Context, req *http.Request) (*http.Response, []byte, api.Warnings, error) {
resp, body, warnings, err := c.Client.Do(ctx, req)
if err != nil {
return resp, body, warnings, err
}
code := resp.StatusCode
var result apiResponse
if err = json.Unmarshal(body, &result); err != nil {
// Pass the returned body rather than the JSON error because some API
// endpoints return plain text instead of JSON payload.
return resp, body, warnings, &clientError{
code: code,
msg: string(body),
}
}
if (code/100 == 2) && (result.Status != statusSuccess) {
return resp, body, warnings, &clientError{
code: code,
msg: "inconsistent body for response code",
}
}
if result.Status == statusError {
err = &clientError{
code: code,
msg: result.Error,
}
}
return resp, []byte(result.Data), warnings, err
}
// StatusAPI provides bindings for the Alertmanager's status API.
type StatusAPI interface {
// Get returns the server's configuration, version, uptime and cluster information.
Get(ctx context.Context) (*ServerStatus, error)
}
// NewStatusAPI returns a status API client.
func NewStatusAPI(c api.Client) StatusAPI {
return &httpStatusAPI{client: apiClient{c}}
}
type httpStatusAPI struct {
client api.Client
}
func (h *httpStatusAPI) Get(ctx context.Context) (*ServerStatus, error) {
u := h.client.URL(epStatus, nil)
req, err := http.NewRequest(http.MethodGet, u.String(), nil)
if err != nil {
return nil, fmt.Errorf("error creating request: %v", err)
}
_, body, _, err := h.client.Do(ctx, req) // Ignoring warnings.
if err != nil {
return nil, err
}
var ss *ServerStatus
err = json.Unmarshal(body, &ss)
return ss, err
}
// AlertAPI provides bindings for the Alertmanager's alert API.
type AlertAPI interface {
// List returns all the active alerts.
List(ctx context.Context, filter, receiver string, silenced, inhibited, active, unprocessed bool) ([]*ExtendedAlert, error)
// Push sends a list of alerts to the Alertmanager.
Push(ctx context.Context, alerts ...Alert) error
}
// Alert represents an alert as expected by the AlertManager's push alert API.
type Alert struct {
Labels LabelSet `json:"labels"`
Annotations LabelSet `json:"annotations"`
StartsAt time.Time `json:"startsAt,omitempty"`
EndsAt time.Time `json:"endsAt,omitempty"`
GeneratorURL string `json:"generatorURL"`
}
// ExtendedAlert represents an alert as returned by the AlertManager's list alert API.
type ExtendedAlert struct {
Alert
Status types.AlertStatus `json:"status"`
Receivers []string `json:"receivers"`
Fingerprint string `json:"fingerprint"`
}
// LabelSet represents a collection of label names and values as a map.
type LabelSet map[LabelName]LabelValue
// LabelName represents the name of a label.
type LabelName string
// LabelValue represents the value of a label.
type LabelValue string
// NewAlertAPI returns a new AlertAPI for the client.
func NewAlertAPI(c api.Client) AlertAPI {
return &httpAlertAPI{client: apiClient{c}}
}
type httpAlertAPI struct {
client api.Client
}
func (h *httpAlertAPI) List(ctx context.Context, filter, receiver string, silenced, inhibited, active, unprocessed bool) ([]*ExtendedAlert, error) {
u := h.client.URL(epAlerts, nil)
params := url.Values{}
if filter != "" {
params.Add("filter", filter)
}
params.Add("silenced", fmt.Sprintf("%t", silenced))
params.Add("inhibited", fmt.Sprintf("%t", inhibited))
params.Add("active", fmt.Sprintf("%t", active))
params.Add("unprocessed", fmt.Sprintf("%t", unprocessed))
params.Add("receiver", receiver)
u.RawQuery = params.Encode()
req, err := http.NewRequest(http.MethodGet, u.String(), nil)
if err != nil {
return nil, fmt.Errorf("error creating request: %v", err)
}
_, body, _, err := h.client.Do(ctx, req) // ignoring warnings.
if err != nil {
return nil, err
}
var alts []*ExtendedAlert
err = json.Unmarshal(body, &alts)
return alts, err
}
func (h *httpAlertAPI) Push(ctx context.Context, alerts ...Alert) error {
u := h.client.URL(epAlerts, nil)
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(&alerts); err != nil {
return err
}
req, err := http.NewRequest(http.MethodPost, u.String(), &buf)
if err != nil {
return fmt.Errorf("error creating request: %v", err)
}
_, _, _, err = h.client.Do(ctx, req) // Ignoring warnings.
return err
}
// SilenceAPI provides bindings for the Alertmanager's silence API.
type SilenceAPI interface {
// Get returns the silence associated with the given ID.
Get(ctx context.Context, id string) (*types.Silence, error)
// Set updates or creates the given silence and returns its ID.
Set(ctx context.Context, sil types.Silence) (string, error)
// Expire expires the silence with the given ID.
Expire(ctx context.Context, id string) error
// List returns silences matching the given filter.
List(ctx context.Context, filter string) ([]*types.Silence, error)
}
// NewSilenceAPI returns a new SilenceAPI for the client.
func NewSilenceAPI(c api.Client) SilenceAPI {
return &httpSilenceAPI{client: apiClient{c}}
}
type httpSilenceAPI struct {
client api.Client
}
func (h *httpSilenceAPI) Get(ctx context.Context, id string) (*types.Silence, error) {
u := h.client.URL(epSilence, map[string]string{
"id": id,
})
req, err := http.NewRequest(http.MethodGet, u.String(), nil)
if err != nil {
return nil, fmt.Errorf("error creating request: %v", err)
}
_, body, _, err := h.client.Do(ctx, req) // Ignoring warnings.
if err != nil {
return nil, err
}
var sil types.Silence
err = json.Unmarshal(body, &sil)
return &sil, err
}
func (h *httpSilenceAPI) Expire(ctx context.Context, id string) error {
u := h.client.URL(epSilence, map[string]string{
"id": id,
})
req, err := http.NewRequest(http.MethodDelete, u.String(), nil)
if err != nil {
return fmt.Errorf("error creating request: %v", err)
}
_, _, _, err = h.client.Do(ctx, req) // Ignoring warnings.
return err
}
func (h *httpSilenceAPI) Set(ctx context.Context, sil types.Silence) (string, error) {
u := h.client.URL(epSilences, nil)
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(&sil); err != nil {
return "", err
}
req, err := http.NewRequest(http.MethodPost, u.String(), &buf)
if err != nil {
return "", fmt.Errorf("error creating request: %v", err)
}
_, body, _, err := h.client.Do(ctx, req) // Ignoring warnings.
if err != nil {
return "", err
}
var res struct {
SilenceID string `json:"silenceId"`
}
err = json.Unmarshal(body, &res)
return res.SilenceID, err
}
func (h *httpSilenceAPI) List(ctx context.Context, filter string) ([]*types.Silence, error) {
u := h.client.URL(epSilences, nil)
params := url.Values{}
if filter != "" {
params.Add("filter", filter)
}
u.RawQuery = params.Encode()
req, err := http.NewRequest(http.MethodGet, u.String(), nil)
if err != nil {
return nil, fmt.Errorf("error creating request: %v", err)
}
_, body, _, err := h.client.Do(ctx, req) // Ignoring warnings.
if err != nil {
return nil, err
}
var sils []*types.Silence
err = json.Unmarshal(body, &sils)
return sils, err
}