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// Copyright 2019 Prometheus Team // 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 api import ( "errors" "fmt" "net/http" "runtime" "time" "github.com/go-kit/log" "github.com/prometheus/client_golang/prometheus" "github.com/prometheus/common/model" "github.com/prometheus/common/route" apiv2 "github.com/prometheus/alertmanager/api/v2" "github.com/prometheus/alertmanager/cluster" "github.com/prometheus/alertmanager/config" "github.com/prometheus/alertmanager/dispatch" "github.com/prometheus/alertmanager/provider" "github.com/prometheus/alertmanager/silence" "github.com/prometheus/alertmanager/types" ) // API represents all APIs of Alertmanager. type API struct { v2 *apiv2.API deprecationRouter *V1DeprecationRouter requestsInFlight prometheus.Gauge concurrencyLimitExceeded prometheus.Counter timeout time.Duration inFlightSem chan struct{} } // Options for the creation of an API object. Alerts, Silences, and StatusFunc // are mandatory to set. The zero value for everything else is a safe default. type Options struct { // Alerts to be used by the API. Mandatory. Alerts provider.Alerts // Silences to be used by the API. Mandatory. Silences *silence.Silences // StatusFunc is used be the API to retrieve the AlertStatus of an // alert. Mandatory. StatusFunc func(model.Fingerprint) types.AlertStatus // Peer from the gossip cluster. If nil, no clustering will be used. Peer cluster.ClusterPeer // Timeout for all HTTP connections. The zero value (and negative // values) result in no timeout. Timeout time.Duration // Concurrency limit for GET requests. The zero value (and negative // values) result in a limit of GOMAXPROCS or 8, whichever is // larger. Status code 503 is served for GET requests that would exceed // the concurrency limit. Concurrency int // Logger is used for logging, if nil, no logging will happen. Logger log.Logger // Registry is used to register Prometheus metrics. If nil, no metrics // registration will happen. Registry prometheus.Registerer // GroupFunc returns a list of alert groups. The alerts are grouped // according to the current active configuration. Alerts returned are // filtered by the arguments provided to the function. GroupFunc func(func(*dispatch.Route) bool, func(*types.Alert, time.Time) bool) (dispatch.AlertGroups, map[model.Fingerprint][]string) } func (o Options) validate() error { if o.Alerts == nil { return errors.New("mandatory field Alerts not set") } if o.Silences == nil { return errors.New("mandatory field Silences not set") } if o.StatusFunc == nil { return errors.New("mandatory field StatusFunc not set") } if o.GroupFunc == nil { return errors.New("mandatory field GroupFunc not set") } return nil } // New creates a new API object combining all API versions. Note that an Update // call is also needed to get the APIs into an operational state. func New(opts Options) (*API, error) { if err := opts.validate(); err != nil { return nil, fmt.Errorf("invalid API options: %w", err) } l := opts.Logger if l == nil { l = log.NewNopLogger() } concurrency := opts.Concurrency if concurrency < 1 { concurrency = runtime.GOMAXPROCS(0) if concurrency < 8 { concurrency = 8 } } v2, err := apiv2.NewAPI( opts.Alerts, opts.GroupFunc, opts.StatusFunc, opts.Silences, opts.Peer, log.With(l, "version", "v2"), opts.Registry, ) if err != nil { return nil, err } // TODO(beorn7): For now, this hardcodes the method="get" label. Other // methods should get the same instrumentation. requestsInFlight := prometheus.NewGauge(prometheus.GaugeOpts{ Name: "alertmanager_http_requests_in_flight", Help: "Current number of HTTP requests being processed.", ConstLabels: prometheus.Labels{"method": "get"}, }) concurrencyLimitExceeded := prometheus.NewCounter(prometheus.CounterOpts{ Name: "alertmanager_http_concurrency_limit_exceeded_total", Help: "Total number of times an HTTP request failed because the concurrency limit was reached.", ConstLabels: prometheus.Labels{"method": "get"}, }) if opts.Registry != nil { if err := opts.Registry.Register(requestsInFlight); err != nil { return nil, err } if err := opts.Registry.Register(concurrencyLimitExceeded); err != nil { return nil, err } } return &API{ deprecationRouter: NewV1DeprecationRouter(log.With(l, "version", "v1")), v2: v2, requestsInFlight: requestsInFlight, concurrencyLimitExceeded: concurrencyLimitExceeded, timeout: opts.Timeout, inFlightSem: make(chan struct{}, concurrency), }, nil } // Register API. As APIv2 works on the http.Handler level, this method also creates a new // http.ServeMux and then uses it to register both the provided router (to // handle "/") and APIv2 (to handle "/api/v2"). The method returns // the newly created http.ServeMux. If a timeout has been set on construction of // API, it is enforced for all HTTP request going through this mux. The same is // true for the concurrency limit, with the exception that it is only applied to // GET requests. func (api *API) Register(r *route.Router, routePrefix string) *http.ServeMux { // TODO(gotjosh) API V1 was removed as of version 0.28, when we reach 1.0.0 we should removed these deprecation warnings. api.deprecationRouter.Register(r.WithPrefix("/api/v1")) mux := http.NewServeMux() mux.Handle("/", api.limitHandler(r)) apiPrefix := "" if routePrefix != "/" { apiPrefix = routePrefix } // TODO(beorn7): HTTP instrumentation is only in place for Router. Since // /api/v2 works on the Handler level, it is currently not instrumented // at all (with the exception of requestsInFlight, which is handled in // limitHandler below). mux.Handle( apiPrefix+"/api/v2/", api.limitHandler(http.StripPrefix(apiPrefix, api.v2.Handler)), ) return mux } // Update config and resolve timeout of each API. APIv2 also needs // setAlertStatus to be updated. func (api *API) Update(cfg *config.Config, setAlertStatus func(model.LabelSet)) { api.v2.Update(cfg, setAlertStatus) } func (api *API) limitHandler(h http.Handler) http.Handler { concLimiter := http.HandlerFunc(func(rsp http.ResponseWriter, req *http.Request) { if req.Method == http.MethodGet { // Only limit concurrency of GETs. select { case api.inFlightSem <- struct{}{}: // All good, carry on. api.requestsInFlight.Inc() defer func() { <-api.inFlightSem api.requestsInFlight.Dec() }() default: api.concurrencyLimitExceeded.Inc() http.Error(rsp, fmt.Sprintf( "Limit of concurrent GET requests reached (%d), try again later.\n", cap(api.inFlightSem), ), http.StatusServiceUnavailable) return } } h.ServeHTTP(rsp, req) }) if api.timeout <= 0 { return concLimiter } return http.TimeoutHandler(concLimiter, api.timeout, fmt.Sprintf( "Exceeded configured timeout of %v.\n", api.timeout, )) }