Merge pull request #165 from prometheus/api
Add initial HTTP API v1 package
This commit is contained in:
Fabian Reinartz
commit
223315ae31
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@ -0,0 +1,362 @@
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// Copyright 2015 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 prometheus provides bindings to the Prometheus HTTP API:
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// http://prometheus.io/docs/querying/api/
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package prometheus
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"net/url"
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"path"
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"strconv"
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"strings"
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"time"
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"github.com/prometheus/common/model"
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"golang.org/x/net/context"
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)
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const (
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statusAPIError = 422
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apiPrefix = "/api/v1"
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epQuery = "/query"
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epQueryRange = "/query_range"
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epLabelValues = "/label/:name/values"
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epSeries = "/series"
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)
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type ErrorType string
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const (
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// The different API error types.
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ErrBadData ErrorType = "bad_data"
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ErrTimeout = "timeout"
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ErrCanceled = "canceled"
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ErrExec = "execution"
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ErrBadResponse = "bad_response"
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)
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// Error is an error returned by the API.
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type Error struct {
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Type ErrorType
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Msg string
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}
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func (e *Error) Error() string {
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return fmt.Sprintf("%s: %s", e.Type, e.Msg)
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}
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// CancelableTransport is like net.Transport but provides
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// per-request cancelation functionality.
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type CancelableTransport interface {
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http.RoundTripper
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CancelRequest(req *http.Request)
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}
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var DefaultTransport CancelableTransport = &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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Dial: (&net.Dialer{
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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}).Dial,
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TLSHandshakeTimeout: 10 * time.Second,
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}
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// Config defines configuration parameters for a new client.
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type Config struct {
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// The address of the Prometheus to connect to.
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Address string
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// Transport is used by the Client to drive HTTP requests. If not
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// provided, DefaultTransport will be used.
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Transport CancelableTransport
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}
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func (cfg *Config) transport() CancelableTransport {
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if cfg.Transport == nil {
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return DefaultTransport
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}
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return cfg.Transport
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}
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type Client interface {
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url(ep string, args map[string]string) *url.URL
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do(context.Context, *http.Request) (*http.Response, []byte, error)
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}
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// New returns a new Client.
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func New(cfg Config) (Client, error) {
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u, err := url.Parse(cfg.Address)
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if err != nil {
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return nil, err
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}
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u.Path = apiPrefix
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return &httpClient{
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endpoint: u,
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transport: cfg.transport(),
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}, nil
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}
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type httpClient struct {
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endpoint *url.URL
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transport CancelableTransport
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}
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func (c *httpClient) url(ep string, args map[string]string) *url.URL {
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p := path.Join(c.endpoint.Path, ep)
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for arg, val := range args {
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arg = ":" + arg
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p = strings.Replace(p, arg, val, -1)
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}
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u := *c.endpoint
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u.Path = p
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return &u
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}
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func (c *httpClient) do(ctx context.Context, req *http.Request) (*http.Response, []byte, error) {
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type roundTripResponse struct {
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resp *http.Response
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err error
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}
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rtchan := make(chan roundTripResponse, 1)
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go func() {
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resp, err := c.transport.RoundTrip(req)
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rtchan <- roundTripResponse{resp: resp, err: err}
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close(rtchan)
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}()
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var resp *http.Response
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var err error
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select {
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case rtresp := <-rtchan:
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resp, err = rtresp.resp, rtresp.err
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case <-ctx.Done():
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// Cancel request and wait until it terminated.
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c.transport.CancelRequest(req)
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resp, err = (<-rtchan).resp, ctx.Err()
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}
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defer func() {
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if resp != nil {
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resp.Body.Close()
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}
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}()
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if err != nil {
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return nil, nil, err
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}
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var body []byte
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done := make(chan struct{})
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go func() {
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body, err = ioutil.ReadAll(resp.Body)
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close(done)
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}()
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select {
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case <-ctx.Done():
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err = resp.Body.Close()
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<-done
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if err == nil {
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err = ctx.Err()
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}
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case <-done:
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}
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return resp, body, err
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}
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// apiClient wraps a regular client and processes successful API responses.
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// Successful also includes responses that errored at the API level.
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type apiClient struct {
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Client
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}
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type apiResponse struct {
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Status string `json:"status"`
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Data json.RawMessage `json:"data"`
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ErrorType ErrorType `json:"errorType"`
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Error string `json:"error"`
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}
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func (c apiClient) do(ctx context.Context, req *http.Request) (*http.Response, []byte, error) {
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resp, body, err := c.Client.do(ctx, req)
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if err != nil {
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return resp, body, err
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}
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code := resp.StatusCode
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if code/100 != 2 && code != statusAPIError {
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return resp, body, &Error{
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Type: ErrBadResponse,
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Msg: fmt.Sprintf("bad response code %d", resp.StatusCode),
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}
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}
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var result apiResponse
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if err = json.Unmarshal(body, &result); err != nil {
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return resp, body, &Error{
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Type: ErrBadResponse,
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Msg: err.Error(),
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}
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}
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if (code == statusAPIError) != (result.Status == "error") {
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err = &Error{
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Type: ErrBadResponse,
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Msg: "inconsistent body for response code",
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}
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}
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if code == statusAPIError && result.Status == "error" {
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err = &Error{
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Type: result.ErrorType,
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Msg: result.Error,
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}
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}
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return resp, []byte(result.Data), err
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}
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// Range represents a sliced time range.
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type Range struct {
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// The boundaries of the time range.
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Start, End time.Time
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// The maximum time between two slices within the boundaries.
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Step time.Duration
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}
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// queryResult contains result data for a query.
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type queryResult struct {
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Type model.ValueType `json:"resultType"`
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Result interface{} `json:"result"`
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// The decoded value.
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v model.Value
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}
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func (qr *queryResult) UnmarshalJSON(b []byte) error {
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v := struct {
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Type model.ValueType `json:"resultType"`
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Result json.RawMessage `json:"result"`
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}{}
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err := json.Unmarshal(b, &v)
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if err != nil {
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return err
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}
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switch v.Type {
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case model.ValScalar:
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var sv model.Scalar
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err = json.Unmarshal(v.Result, &sv)
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qr.v = &sv
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case model.ValVector:
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var vv model.Vector
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err = json.Unmarshal(v.Result, &vv)
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qr.v = vv
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case model.ValMatrix:
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var mv model.Matrix
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err = json.Unmarshal(v.Result, &mv)
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qr.v = mv
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default:
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err = fmt.Errorf("unexpected value type %q", v.Type)
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}
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return err
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}
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// QueryAPI provides bindings the Prometheus's query API.
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type QueryAPI interface {
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// Query performs a query for the given time.
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Query(ctx context.Context, query string, ts time.Time) (model.Value, error)
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// Query performs a query for the given range.
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QueryRange(ctx context.Context, query string, r Range) (model.Value, error)
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}
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// NewQueryAPI returns a new QueryAPI for the client.
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func NewQueryAPI(c Client) QueryAPI {
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return &httpQueryAPI{client: apiClient{c}}
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}
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type httpQueryAPI struct {
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client Client
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}
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func (h *httpQueryAPI) Query(ctx context.Context, query string, ts time.Time) (model.Value, error) {
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u := h.client.url(epQuery, nil)
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q := u.Query()
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q.Set("query", query)
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q.Set("time", ts.Format(time.RFC3339Nano))
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u.RawQuery = q.Encode()
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req, _ := http.NewRequest("GET", u.String(), nil)
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_, body, err := h.client.do(ctx, req)
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if err != nil {
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return nil, err
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}
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var qres queryResult
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err = json.Unmarshal(body, &qres)
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return model.Value(qres.v), err
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}
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func (h *httpQueryAPI) QueryRange(ctx context.Context, query string, r Range) (model.Value, error) {
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u := h.client.url(epQueryRange, nil)
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q := u.Query()
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var (
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start = r.Start.Format(time.RFC3339Nano)
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end = r.End.Format(time.RFC3339Nano)
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step = strconv.FormatFloat(r.Step.Seconds(), 'f', 3, 64)
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)
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q.Set("query", query)
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q.Set("start", start)
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q.Set("end", end)
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q.Set("step", step)
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u.RawQuery = q.Encode()
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req, _ := http.NewRequest("GET", u.String(), nil)
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_, body, err := h.client.do(ctx, req)
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if err != nil {
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return nil, err
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}
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var qres queryResult
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err = json.Unmarshal(body, &qres)
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return model.Value(qres.v), err
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}
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@ -0,0 +1,453 @@
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// Copyright 2015 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
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
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//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// 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.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
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|
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package prometheus
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"net/url"
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"reflect"
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"testing"
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"time"
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"github.com/prometheus/common/model"
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"golang.org/x/net/context"
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)
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func TestConfig(t *testing.T) {
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c := Config{}
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if c.transport() != DefaultTransport {
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t.Fatalf("expected default transport for nil Transport field")
|
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}
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}
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func TestClientURL(t *testing.T) {
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tests := []struct {
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address string
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endpoint string
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args map[string]string
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expected string
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}{
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{
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address: "http://localhost:9090",
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endpoint: "/test",
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expected: "http://localhost:9090/test",
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},
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{
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address: "http://localhost",
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endpoint: "/test",
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expected: "http://localhost/test",
|
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},
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{
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address: "http://localhost:9090",
|
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endpoint: "test",
|
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expected: "http://localhost:9090/test",
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},
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{
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address: "http://localhost:9090/prefix",
|
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endpoint: "/test",
|
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expected: "http://localhost:9090/prefix/test",
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},
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{
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address: "https://localhost:9090/",
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endpoint: "/test/",
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expected: "https://localhost:9090/test",
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},
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{
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address: "http://localhost:9090",
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endpoint: "/test/:param",
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args: map[string]string{
|
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"param": "content",
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},
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expected: "http://localhost:9090/test/content",
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},
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{
|
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address: "http://localhost:9090",
|
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endpoint: "/test/:param/more/:param",
|
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args: map[string]string{
|
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"param": "content",
|
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},
|
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expected: "http://localhost:9090/test/content/more/content",
|
||||
},
|
||||
{
|
||||
address: "http://localhost:9090",
|
||||
endpoint: "/test/:param/more/:foo",
|
||||
args: map[string]string{
|
||||
"param": "content",
|
||||
"foo": "bar",
|
||||
},
|
||||
expected: "http://localhost:9090/test/content/more/bar",
|
||||
},
|
||||
{
|
||||
address: "http://localhost:9090",
|
||||
endpoint: "/test/:param",
|
||||
args: map[string]string{
|
||||
"nonexistant": "content",
|
||||
},
|
||||
expected: "http://localhost:9090/test/:param",
|
||||
},
|
||||
}
|
||||
|
||||
for _, test := range tests {
|
||||
ep, err := url.Parse(test.address)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
hclient := &httpClient{
|
||||
endpoint: ep,
|
||||
transport: DefaultTransport,
|
||||
}
|
||||
|
||||
u := hclient.url(test.endpoint, test.args)
|
||||
if u.String() != test.expected {
|
||||
t.Errorf("unexpected result: got %s, want %s", u, test.expected)
|
||||
continue
|
||||
}
|
||||
|
||||
// The apiClient must return exactly the same result as the httpClient.
|
||||
aclient := &apiClient{hclient}
|
||||
|
||||
u = aclient.url(test.endpoint, test.args)
|
||||
if u.String() != test.expected {
|
||||
t.Errorf("unexpected result: got %s, want %s", u, test.expected)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
type testClient struct {
|
||||
*testing.T
|
||||
|
||||
ch chan apiClientTest
|
||||
req *http.Request
|
||||
}
|
||||
|
||||
type apiClientTest struct {
|
||||
code int
|
||||
response interface{}
|
||||
expected string
|
||||
err *Error
|
||||
}
|
||||
|
||||
func (c *testClient) url(ep string, args map[string]string) *url.URL {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (c *testClient) do(ctx context.Context, req *http.Request) (*http.Response, []byte, error) {
|
||||
if ctx == nil {
|
||||
c.Fatalf("context was not passed down")
|
||||
}
|
||||
if req != c.req {
|
||||
c.Fatalf("request was not passed down")
|
||||
}
|
||||
|
||||
test := <-c.ch
|
||||
|
||||
var b []byte
|
||||
var err error
|
||||
|
||||
switch v := test.response.(type) {
|
||||
case string:
|
||||
b = []byte(v)
|
||||
default:
|
||||
b, err = json.Marshal(v)
|
||||
if err != nil {
|
||||
c.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
resp := &http.Response{
|
||||
StatusCode: test.code,
|
||||
}
|
||||
|
||||
return resp, b, nil
|
||||
}
|
||||
|
||||
func TestAPIClientDo(t *testing.T) {
|
||||
tests := []apiClientTest{
|
||||
{
|
||||
response: &apiResponse{
|
||||
Status: "error",
|
||||
Data: json.RawMessage(`null`),
|
||||
ErrorType: ErrBadData,
|
||||
Error: "failed",
|
||||
},
|
||||
err: &Error{
|
||||
Type: ErrBadData,
|
||||
Msg: "failed",
|
||||
},
|
||||
code: statusAPIError,
|
||||
expected: `null`,
|
||||
},
|
||||
{
|
||||
response: &apiResponse{
|
||||
Status: "error",
|
||||
Data: json.RawMessage(`"test"`),
|
||||
ErrorType: ErrTimeout,
|
||||
Error: "timed out",
|
||||
},
|
||||
err: &Error{
|
||||
Type: ErrTimeout,
|
||||
Msg: "timed out",
|
||||
},
|
||||
code: statusAPIError,
|
||||
expected: `test`,
|
||||
},
|
||||
{
|
||||
response: "bad json",
|
||||
err: &Error{
|
||||
Type: ErrBadResponse,
|
||||
Msg: "bad response code 400",
|
||||
},
|
||||
code: http.StatusBadRequest,
|
||||
},
|
||||
{
|
||||
response: "bad json",
|
||||
err: &Error{
|
||||
Type: ErrBadResponse,
|
||||
Msg: "invalid character 'b' looking for beginning of value",
|
||||
},
|
||||
code: statusAPIError,
|
||||
},
|
||||
{
|
||||
response: &apiResponse{
|
||||
Status: "success",
|
||||
Data: json.RawMessage(`"test"`),
|
||||
},
|
||||
err: &Error{
|
||||
Type: ErrBadResponse,
|
||||
Msg: "inconsistent body for response code",
|
||||
},
|
||||
code: statusAPIError,
|
||||
},
|
||||
{
|
||||
response: &apiResponse{
|
||||
Status: "success",
|
||||
Data: json.RawMessage(`"test"`),
|
||||
ErrorType: ErrTimeout,
|
||||
Error: "timed out",
|
||||
},
|
||||
err: &Error{
|
||||
Type: ErrBadResponse,
|
||||
Msg: "inconsistent body for response code",
|
||||
},
|
||||
code: statusAPIError,
|
||||
},
|
||||
{
|
||||
response: &apiResponse{
|
||||
Status: "error",
|
||||
Data: json.RawMessage(`"test"`),
|
||||
ErrorType: ErrTimeout,
|
||||
Error: "timed out",
|
||||
},
|
||||
err: &Error{
|
||||
Type: ErrBadResponse,
|
||||
Msg: "inconsistent body for response code",
|
||||
},
|
||||
code: http.StatusOK,
|
||||
},
|
||||
}
|
||||
|
||||
tc := &testClient{
|
||||
T: t,
|
||||
ch: make(chan apiClientTest, 1),
|
||||
req: &http.Request{},
|
||||
}
|
||||
client := &apiClient{tc}
|
||||
|
||||
for _, test := range tests {
|
||||
|
||||
tc.ch <- test
|
||||
|
||||
_, body, err := client.do(context.Background(), tc.req)
|
||||
|
||||
if test.err != nil {
|
||||
if err == nil {
|
||||
t.Errorf("expected error %q but got none", test.err)
|
||||
continue
|
||||
}
|
||||
if test.err.Error() != err.Error() {
|
||||
t.Errorf("unexpected error: want %q, got %q", test.err, err)
|
||||
}
|
||||
continue
|
||||
}
|
||||
if err != nil {
|
||||
t.Errorf("unexpeceted error %s", err)
|
||||
continue
|
||||
}
|
||||
|
||||
want, got := test.expected, string(body)
|
||||
if want != got {
|
||||
t.Errorf("unexpected body: want %q, got %q", want, got)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
type apiTestClient struct {
|
||||
*testing.T
|
||||
curTest apiTest
|
||||
}
|
||||
|
||||
type apiTest struct {
|
||||
do func() (interface{}, error)
|
||||
inErr error
|
||||
inRes interface{}
|
||||
|
||||
reqPath string
|
||||
reqParam url.Values
|
||||
reqMethod string
|
||||
res interface{}
|
||||
err error
|
||||
}
|
||||
|
||||
func (c *apiTestClient) url(ep string, args map[string]string) *url.URL {
|
||||
u := &url.URL{
|
||||
Host: "test:9090",
|
||||
Path: apiPrefix + ep,
|
||||
}
|
||||
return u
|
||||
}
|
||||
|
||||
func (c *apiTestClient) do(ctx context.Context, req *http.Request) (*http.Response, []byte, error) {
|
||||
|
||||
test := c.curTest
|
||||
|
||||
if req.URL.Path != test.reqPath {
|
||||
c.Errorf("unexpected request path: want %s, got %s", test.reqPath, req.URL.Path)
|
||||
}
|
||||
if req.Method != test.reqMethod {
|
||||
c.Errorf("unexpected request method: want %s, got %s", test.reqMethod, req.Method)
|
||||
}
|
||||
|
||||
b, err := json.Marshal(test.inRes)
|
||||
if err != nil {
|
||||
c.Fatal(err)
|
||||
}
|
||||
|
||||
resp := &http.Response{}
|
||||
if test.inErr != nil {
|
||||
resp.StatusCode = statusAPIError
|
||||
} else {
|
||||
resp.StatusCode = http.StatusOK
|
||||
}
|
||||
|
||||
return resp, b, test.inErr
|
||||
}
|
||||
|
||||
func TestAPIs(t *testing.T) {
|
||||
|
||||
testTime := time.Now()
|
||||
|
||||
client := &apiTestClient{T: t}
|
||||
|
||||
queryApi := &httpQueryAPI{
|
||||
client: client,
|
||||
}
|
||||
|
||||
doQuery := func(q string, ts time.Time) func() (interface{}, error) {
|
||||
return func() (interface{}, error) {
|
||||
return queryApi.Query(context.Background(), q, ts)
|
||||
}
|
||||
}
|
||||
|
||||
doQueryRange := func(q string, rng Range) func() (interface{}, error) {
|
||||
return func() (interface{}, error) {
|
||||
return queryApi.QueryRange(context.Background(), q, rng)
|
||||
}
|
||||
}
|
||||
|
||||
queryTests := []apiTest{
|
||||
{
|
||||
do: doQuery("2", testTime),
|
||||
inRes: &queryResult{
|
||||
Type: model.ValScalar,
|
||||
Result: &model.Scalar{
|
||||
Value: 2,
|
||||
Timestamp: model.TimeFromUnix(testTime.Unix()),
|
||||
},
|
||||
},
|
||||
|
||||
reqMethod: "GET",
|
||||
reqPath: "/api/v1/query",
|
||||
reqParam: url.Values{
|
||||
"query": []string{"2"},
|
||||
"time": []string{testTime.Format(time.RFC3339Nano)},
|
||||
},
|
||||
res: &model.Scalar{
|
||||
Value: 2,
|
||||
Timestamp: model.TimeFromUnix(testTime.Unix()),
|
||||
},
|
||||
},
|
||||
{
|
||||
do: doQuery("2", testTime),
|
||||
inErr: fmt.Errorf("some error"),
|
||||
|
||||
reqMethod: "GET",
|
||||
reqPath: "/api/v1/query",
|
||||
reqParam: url.Values{
|
||||
"query": []string{"2"},
|
||||
"time": []string{testTime.Format(time.RFC3339Nano)},
|
||||
},
|
||||
err: fmt.Errorf("some error"),
|
||||
},
|
||||
|
||||
{
|
||||
do: doQueryRange("2", Range{
|
||||
Start: testTime.Add(-time.Minute),
|
||||
End: testTime,
|
||||
Step: time.Minute,
|
||||
}),
|
||||
inErr: fmt.Errorf("some error"),
|
||||
|
||||
reqMethod: "GET",
|
||||
reqPath: "/api/v1/query_range",
|
||||
reqParam: url.Values{
|
||||
"query": []string{"2"},
|
||||
"start": []string{testTime.Add(-time.Minute).Format(time.RFC3339Nano)},
|
||||
"end": []string{testTime.Format(time.RFC3339Nano)},
|
||||
"step": []string{time.Minute.String()},
|
||||
},
|
||||
err: fmt.Errorf("some error"),
|
||||
},
|
||||
}
|
||||
|
||||
var tests []apiTest
|
||||
tests = append(tests, queryTests...)
|
||||
|
||||
for _, test := range tests {
|
||||
client.curTest = test
|
||||
|
||||
res, err := test.do()
|
||||
|
||||
if test.err != nil {
|
||||
if err == nil {
|
||||
t.Errorf("expected error %q but got none", test.err)
|
||||
continue
|
||||
}
|
||||
if err.Error() != test.err.Error() {
|
||||
t.Errorf("unexpected error: want %s, got %s", test.err, err)
|
||||
}
|
||||
continue
|
||||
}
|
||||
if err != nil {
|
||||
t.Errorf("unexpected error: %s", err)
|
||||
continue
|
||||
}
|
||||
|
||||
if !reflect.DeepEqual(res, test.res) {
|
||||
t.Errorf("unexpected result: want %v, got %v", test.res, res)
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue