commit 7984223fb186e7188da95483107c200dd2b129a5 Author: Benoit Perroud Date: Tue Feb 2 21:21:12 2021 +0100 🎉 diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..355772e --- /dev/null +++ b/Dockerfile @@ -0,0 +1,11 @@ +FROM alpine + +RUN apk add --no-cache ca-certificates + +COPY prometheus-docker-labels-discovery /prometheus-docker-labels-discovery + +# Because of access to docker.sock, it's easier to run it as root... +#USER nobody + +ENTRYPOINT ["/prometheus-docker-labels-discovery"] +EXPOSE 8080 diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..90896a6 --- /dev/null +++ b/Makefile @@ -0,0 +1,47 @@ + +VERSION=v1.0.0 +GOOS=linux +GOCMD=go +GOBUILD=$(GOCMD) build +GOCLEAN=$(GOCMD) clean +GOTEST=$(GOCMD) test +GOLINT=golangci-lint run +VERSION_MAJOR=$(shell echo $(VERSION) | cut -f1 -d.) +VERSION_MINOR=$(shell echo $(VERSION) | cut -f2 -d.) +BINARY_NAME=prometheus-docker-labels-discovery +GO_PACKAGE=sqooba/prometheus-docker-labels-discovery +DOCKER_REGISTRY= +GIT_COMMIT=$(shell git rev-parse HEAD) +GIT_DIRTY=$(shell test -n "`git status --porcelain`" && echo "+CHANGES" || true) +BUILD_DATE=$(shell date '+%Y-%m-%d-%H:%M:%S') + +ensure: + GOOS=${GOOS} $(GOCMD) mod vendor + +clean: + $(GOCLEAN) + +lint: + $(GOLINT) ... + +build: + GOOS=${GOOS} $(GOBUILD) \ + -ldflags "-X version.GitCommit=${GIT_COMMIT}${GIT_DIRTY} \ + -X version.BuildDate=${BUILD_DATE} \ + -X version.Version=${VERSION}" \ + -o ${BINARY_NAME} . + +package: + docker build -f Dockerfile \ + -t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION) \ + -t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR).$(VERSION_MINOR) \ + -t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR) \ + . + +test: + go test ./... + +release: + docker push ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION) + docker push ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR).$(VERSION_MINOR) + docker push ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR) diff --git a/README.md b/README.md new file mode 100644 index 0000000..12fb253 --- /dev/null +++ b/README.md @@ -0,0 +1,77 @@ +Discover docker containers to scrape based on labels +==== + +This tool aims at discovering containers running +with `prometheus.io/scrape=true` annotations +from a given docker engine, and auto-configure prometheus for scraping. + +This tool is standalone and write the discovered containers (services) in a file, +which is in turn passed to Prometheus file service discovery to start the scraping jobs. + +![overall diagram](overall-diagram.png) + +# Example via a docker-compose + +The following part is giving a complete example of configuring the docker-labels discovery mechanism. +It is based in three parts, namely: +- Configure prometheus-docker-labels-discovery +- Configure Prometheus file_sd_configs +- Configure your services + +## Configure prometheus-docker-labels-discovery + +``` + prometheus-docker-labels-discovery: + image: sqooba/prometheus-docker-labels-discovery:v1 + restart: unless-stopped + networks: + - monitoring_default # make sure this network exists and is connected to prometheus +# ports: +# - "8080" + security_opt: + - no-new-privileges:true + volumes: # Mount the JSON file that will be exchanged with prometheus + - ./from-docker-labels.json:/tmp/from-docker-labels.json + environment: + - PROMETHEUS_CONFIG_FILE_PATH=/tmp/from-docker-labels.json + - DOCKER_NETWORK_NAME=bridge + - PROMETHEUS_COMMON_LABELS=commonlabel1=commonvalue1 +``` + +## Configure Prometheus + +Prometheus needs to be configured using [file_sd_configs](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#file_sd_config) +scrape config. + +``` +scrape_configs: +- job_name: 'docker-labels-sd' + file_sd_configs: + - files: + - 'from_docker_labels.json' +``` + +## Configure your services + +Any service can now be configured using [docker labels](https://docs.docker.com/config/labels-custom-metadata/). +The following example shows in docker-compose style how this looks like: + +``` +services: + test-metrics: + image: dummy-metrics:v1 + labels: + - "prometheus.io/scrape=true" + - "prometheus.io/path=/metrics" + - "prometheus.io/extra-labels=k1:v1,k2:v2" +``` + +The exhaustive list of labels to configure properly your service is provided below: + +| Annotation | Definition | Example | +| ---------- | ---------- | ------- | +| `prometheus.io/scrape` | Main label to ensure this container will be scraped by Prometheus. Required value is `true`. Any other value will not be considered. | `prometheus.io/scrape=true`| +| `prometheus.io/port` | Specify which port to use for the scraping. In case of a single port exposed, this configuration can be omitted. | `prometheus.io/port=8080` | +| `prometheus.io/path` | Alternative path for scraping the metrics. Default from Prometheus is `/`. | `prometheus.io/path=/metrics` | +| `prometheus.io/scheme` | Alternative scheme for scraping thee metrics. Default from Prometheus is `http`. | `prometheus.io/scheme=https` | +| `prometheus.io/extra-labels` | Any extra labels to add to the metrics scraped for this container. Comma separated key:value pairs. | `prometheus.io/extra-labels=label1:value1,label2:value2,...` | diff --git a/docker_handler.go b/docker_handler.go new file mode 100644 index 0000000..4b8badd --- /dev/null +++ b/docker_handler.go @@ -0,0 +1,323 @@ +package main + +import ( + "context" + "fmt" + "github.com/docker/docker/api/types" + "github.com/docker/docker/api/types/filters" + "github.com/docker/docker/client" + "github.com/prometheus/common/model" + "sync" + "time" +) + +type dockerHandler struct { + config envConfig + client *client.Client + writer *promHandler + managedContainers map[string]containerScrapeConfig + lock sync.Locker + startContainerChan chan []string + stopContainerChan chan []string +} + +const ( + dockerEventActionStart = "start" + dockerEventActionDie = "die" + dockerEventTypeContainer = "container" + + prometheusEnableScrapeAnnotation = "prometheus.io/scrape" + prometheusEnableScrapeAnnotationValue = "true" + prometheusPortAnnotation = "prometheus.io/port" + prometheusIpAnnotation = "prometheus.io/ip" + prometheusPathAnnotation = "prometheus.io/path" + prometheusSchemeAnnotation = "prometheus.io/scheme" + prometheusExtraLabelsAnnotation = "prometheus.io/extra-labels" // comma separated extra labels for this pod +) + +type containerScrapeConfig struct { + Targets []string `json:"targets"` + Labels map[string]string `json:"labels"` +} + +func newDockerHandler(config envConfig, writer *promHandler) (*dockerHandler, error) { + + dockerClient, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation()) + if err != nil { + return nil, err + } + + _, err = dockerClient.Ping(context.Background()) + if err != nil { + log.Debugf("Got an error while pinging the docker engine %v, err = %v", dockerClient.DaemonHost(), err) + return nil, err + } + + networks, err := dockerClient.NetworkList(context.Background(), types.NetworkListOptions{}) + if err != nil { + log.Debugf("Got an error while listing the networks, err = %v", err) + return nil, err + } + foundNetwork := false + for _, n := range networks { + if n.Name == config.DockerNetworkName { + foundNetwork = true + } + } + if !foundNetwork { + log.Debugf("No network found with the name %s...", config.DockerNetworkName) + return nil, fmt.Errorf("no network named %s found. Please docker network create %s", config.DockerNetworkName, config.DockerNetworkName) + } + + handler := &dockerHandler{ + config: config, + client: dockerClient, + writer: writer, + managedContainers: make(map[string]containerScrapeConfig), + lock: &sync.Mutex{}, + startContainerChan: make(chan []string), + stopContainerChan: make(chan []string), + } + + return handler, nil +} + +func (h *dockerHandler) handle() error { + + ctx, cancel := context.WithCancel(context.Background()) + defer cancel() + + go h.listenToDockerEvents(ctx) + go h.listDockerContainers(ctx) + + for { + select { + case <-ctx.Done(): + return nil + case containersToAdd := <-h.startContainerChan: + h.addContainersToScrapeConfig(containersToAdd) + case containerToRemove := <-h.stopContainerChan: + h.removeContainersFromScrapeConfig(containerToRemove) + } + } +} + +func (h *dockerHandler) pollDockerContainers(ctx context.Context) { + h.listDockerContainers(ctx) + if h.config.DockerPollFrequency > 0 { + for range time.Tick(h.config.DockerPollFrequency) { + h.listDockerContainers(ctx) + } + } +} + +func (h *dockerHandler) listDockerContainers(ctx context.Context) { + + f := filters.NewArgs(filters.KeyValuePair{Key: "status", Value: "running"}, + filters.KeyValuePair{Key: "label", Value: prometheusEnableScrapeAnnotation + "=" + prometheusEnableScrapeAnnotationValue}) + containers, err := h.client.ContainerList(context.Background(), types.ContainerListOptions{ + Filters: f, + }) + if err != nil { + log.Warnf("Got an error while listing the containers, err = %v", err) + return + } + containerIds := make([]string, 0, 0) + for _, c := range containers { + if containerIsManaged(c.Labels) { + log.Debugf("Container %s is managed", c.ID) + containerIds = append(containerIds, c.ID) + } + } + + if len(containerIds) > 0 { + h.startContainerChan <- containerIds + } +} + +func (h *dockerHandler) listenToDockerEvents(ctx context.Context) { + + ctx, cancel := context.WithCancel(context.Background()) + eventsChan, errsChan := h.client.Events(ctx, types.EventsOptions{}) + + defer func() { + cancel() + }() + + for { + select { + case <-ctx.Done(): + return + case event := <-eventsChan: + log.Tracef("Got an event %v", event) + if event.Type == dockerEventTypeContainer && event.Action == dockerEventActionStart { + log.Infof("Got a start of container %s", event.ID) + h.startContainerChan <- []string{event.ID} + } else if event.Type == dockerEventTypeContainer && event.Action == dockerEventActionDie { + log.Infof("Got a stop of container %s", event.ID) + h.stopContainerChan <- []string{event.ID} + } + case err := <-errsChan: + log.Fatalf("Got an error while listening to events, err = %v", err) + return + } + } +} + +func (h *dockerHandler) addContainersToScrapeConfig(containerIds []string) { + + log.Debugf("addContainersToScrapeConfig for %v", containerIds) + + h.lock.Lock() + defer h.lock.Unlock() + + hasContainersAdded := false + + for _, containerId := range containerIds { + + managed, containerScrapeConfig, err := h.findHostPortAndPathForContainer(containerId) + if err != nil { + log.Warnf("Got an error while getting container %s configuration details, err = %v", containerId, err) + } else if managed { + _, exists := h.managedContainers[containerId] + if !exists { + h.managedContainers[containerId] = containerScrapeConfig + hasContainersAdded = true + } + } else { + log.Debugf("Container %s is not managed by us, ignoring", containerId) + } + } + + if hasContainersAdded { + err := h.writer.write(h.managedContainers) + if err != nil { + log.Warnf("Got an error while trying to write the config to the prometheus file, err = %v", err) + } + } +} + +func (h *dockerHandler) removeContainersFromScrapeConfig(containerIds []string) { + + log.Debugf("removeContainersFromScrapeConfig for %v", containerIds) + + h.lock.Lock() + defer h.lock.Unlock() + + hasContainersRemoved := false + + for _, containerId := range containerIds { + _, exists := h.managedContainers[containerId] + if exists { + delete(h.managedContainers, containerId) + hasContainersRemoved = true + } + } + + if hasContainersRemoved { + err := h.writer.write(h.managedContainers) + if err != nil { + log.Warnf("Got an error while trying to write the config to the prometheus file, err = %v", err) + } + } +} + +func (h *dockerHandler) findHostPortAndPathForContainer(containerId string) (bool, containerScrapeConfig, error) { + + containerScrapeConfig := containerScrapeConfig{ + Labels: make(map[string]string), + } + + c, err := h.client.ContainerInspect(context.Background(), containerId) + if err != nil { + log.Warnf("Got an error while inspecting container %s: err = %v", containerId, err) + return false, containerScrapeConfig, err + } + + if containerIsManaged(c.Config.Labels) { + + // Find port + port := getFromMapOrDefault(prometheusPortAnnotation, c.Config.Labels, "") + if port == "" { + containerPorts := getContainerPortsNetworkConfig(c.NetworkSettings.Ports) + if len(containerPorts) != 1 { + log.Warnf("Too many port mapped, can't decide which one to pick without more hint... Please set %s annotation to configure the scraping properly.", prometheusPortAnnotation) + return false, containerScrapeConfig, nil + } + if containerPorts[0].Proto() != "tcp" { + log.Warnf("The only mapped port is UDP and is not supported by the scraping. Please set %s annotation to configure the scraping properly.", prometheusPortAnnotation) + return false, containerScrapeConfig, nil + } + port = containerPorts[0].Port() + } + + // Find ip + var ip string + network, ok := c.NetworkSettings.Networks[h.config.DockerNetworkName] + if ok { + ip = network.IPAddress + } else { + ip = getFromMapOrDefault(prometheusIpAnnotation, c.Config.Labels, "") + if ip == "" { + if h.config.DockerNetworkStrict { + log.Warnf("This container is not attached to %s network. Strict networking is requested, so it can't be scraped.", h.config.DockerNetworkName) + return false, containerScrapeConfig, nil + } + + log.Infof("This container is not attached to %s network. No guarantee it can be reached by prometheus, but trying the first listed network...", h.config.DockerNetworkName) + networks := getNetworkNamesFromNetworks(c.NetworkSettings.Networks) + if len(networks) <= 0 { + log.Warnf("[BOGUS] No network found at all for this container ?? This container can't be scraped...") + return false, containerScrapeConfig, nil + } + network, ok = c.NetworkSettings.Networks[networks[0]] + if !ok { + log.Warnf("[BOGUS] Network %s not found for this container ?? This container can't be scraped...", networks[0]) + return false, containerScrapeConfig, nil + } + log.Warnf("Network %s got chosen instead of %s... Hope it is reachable from Prometheus", networks[0], h.config.DockerNetworkName) + ip = network.IPAddress + } + } + containerScrapeConfig.Targets = append(containerScrapeConfig.Targets, fmt.Sprintf("%s:%s", ip, port)) + + // Handle labels + // Add common labels. Note they can be overwritten by specific labels from the container itself. + for k, v := range h.config.PrometheusCommonLabels { + containerScrapeConfig.Labels[k] = v + } + + extraLabels := parseCSLabels(getFromMapOrDefault(prometheusExtraLabelsAnnotation, c.Config.Labels, "")) + for k, v := range extraLabels { + containerScrapeConfig.Labels[k] = v + } + + if h.config.PrometheusAddContainerMetadata { + containerScrapeConfig.Labels[model.MetaLabelPrefix+"container_id"] = c.ID + containerScrapeConfig.Labels[model.MetaLabelPrefix+"container_name"] = c.Name + } + + // Find path + path := getFromMapOrDefault(prometheusPathAnnotation, c.Config.Labels, "") + if path != "" { + containerScrapeConfig.Labels[model.MetricsPathLabel] = path + } + + // Find scheme + scheme := getFromMapOrDefault(prometheusSchemeAnnotation, c.Config.Labels, "") + if scheme != "" { + containerScrapeConfig.Labels[model.SchemeLabel] = scheme + } + + return true, containerScrapeConfig, nil + } else { + // container is not managed. + return false, containerScrapeConfig, nil + } +} + +func containerIsManaged(labels map[string]string) bool { + enabled, ok := labels[prometheusEnableScrapeAnnotation] + return ok && + enabled == prometheusEnableScrapeAnnotationValue +} diff --git a/docker_handler_test.go b/docker_handler_test.go new file mode 100644 index 0000000..c850aff --- /dev/null +++ b/docker_handler_test.go @@ -0,0 +1,27 @@ +package main + +import ( + "github.com/sqooba/go-common/logging" + "github.com/stretchr/testify/assert" + "testing" +) + +func TestDockerEventsListener(t *testing.T) { + + config := envConfig{ + PrometheusConfigFilePath: "test-data/from-docker-labels.json", + DockerNetworkName: "bridge", + LogLevel: "debug", + PrometheusCommonLabels: map[string]string{"c1": "v1"}, + } + err := logging.SetLogLevel(log, config.LogLevel) + + writer, err := newPromFileHandler(config) + assert.Nil(t, err) + + dockerHandler, err := newDockerHandler(config, writer) + assert.Nil(t, err) + + err = dockerHandler.handle() + assert.Nil(t, err) +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..47940fa --- /dev/null +++ b/go.mod @@ -0,0 +1,20 @@ +module github.com/touilleio/prometheus-docker-labels-discovery + +go 1.15 + +require ( + github.com/Microsoft/go-winio v0.4.16 // indirect + github.com/containerd/containerd v1.4.3 // indirect + github.com/docker/distribution v2.7.1+incompatible // indirect + github.com/docker/docker v20.10.1+incompatible + github.com/docker/go-connections v0.4.0 + github.com/docker/go-units v0.4.0 // indirect + github.com/kelseyhightower/envconfig v1.4.0 + github.com/opencontainers/go-digest v1.0.0 // indirect + github.com/opencontainers/image-spec v1.0.1 // indirect + github.com/prometheus/client_golang v1.9.0 + github.com/prometheus/common v0.15.0 + github.com/stretchr/testify v1.6.1 + golang.org/x/sys v0.0.0-20201223074533-0d417f636930 // indirect + github.com/sqooba/go-common v0.0.0-20210308210041-34f0d28a008b +) diff --git a/go.sum 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level. Possible values are trace,debug,info,warn,error,fatal,panic") + log = logging.NewLogger() +) + +type envConfig struct { + Port string `envconfig:"PORT" default:"8080"` + LogLevel string `envconfig:"LOG_LEVEL" default:"info"` + MetricsNamespace string `envconfig:"METRICS_NAMESPACE" default:"dockerlabelsdiscovery"` + MetricsSubsystem string `envconfig:"METRICS_SUBSYSTEM" default:""` + MetricsPath string `envconfig:"METRICS_PATH" default:"/metrics"` + + PrometheusConfigFilePath string `envconfig:"PROMETHEUS_CONFIG_FILE_PATH"` + PrometheusAddContainerMetadata bool `envconfig:"PROMETHEUS_ADD_CONTAINER_METADATA"` // adds container_id and container name to the target labels. + DockerNetworkName string `envconfig:"DOCKER_NETWORK_NAME" default:"monitoring_default"` // docker network to search ip from. + DockerNetworkStrict bool `envconfig:"DOCKER_NETWORK_STRICT"` // Restrict to the DockerNetworkName, or use it as preferred network but try to best effort to find a ip on another network. + DockerPollFrequency time.Duration `envconfig:"DOCKER_POLL_FREQUENCY" defaults:"5m"` + PrometheusCommonLabels map[string]string `envconfig:"PROMETHEUS_COMMON_LABELS"` // Comma separated key:value to add to all targets. +} + +func main() { + log.Println("prometheus-docker-labels-discovery application is starting...") + log.Printf("Version : %s", version.Version) + log.Printf("Commit : %s", version.GitCommit) + log.Printf("Build date : %s", version.BuildDate) + log.Printf("OSarch : %s", version.OsArch) + + var env envConfig + if err := envconfig.Process("", &env); err != nil { + log.Printf("[ERROR] Failed to process env var: %s\n", err) + return + } + + flag.Parse() + err := logging.SetLogLevel(log, env.LogLevel) + if err != nil { + log.Fatalf("Logging level %s do not seem to be right. Err = %v", env.LogLevel, err) + } + + if *setLogLevel != "" { + logging.SetRemoteLogLevelAndExit(log, env.Port, *setLogLevel) + } + + // Special endpoint to change the verbosity at runtime, i.e. curl -X PUT --data debug ... + logging.InitVerbosityHandler(log, http.DefaultServeMux) + initPrometheus(env, http.DefaultServeMux) + signalChan := make(chan os.Signal, 1) + signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM) + var wg sync.WaitGroup + + promFileHandler, err := newPromFileHandler(env) + if err != nil { + log.Fatalf("Got an exception while initialising prometheus file handler. Err = %v", err) + } + + dockerHandler, err := newDockerHandler(env, promFileHandler) + if err != nil { + log.Fatalf("Got an exception while initialising docker handler. Err = %v", err) + } + go dockerHandler.handle() + + s := http.Server{Addr: fmt.Sprint(":", env.Port)} + go func() { + log.Fatal(s.ListenAndServe()) + }() + + <-signalChan + log.Printf("Shutdown signal received, exiting...") + + err = s.Shutdown(context.Background()) + if err != nil { + log.Fatalf("Got an error while shutting down: %v\n", err) + } + + // Wait for processing to complete properly + wg.Wait() +} diff --git a/metrics.go b/metrics.go new file mode 100644 index 0000000..13421ef --- /dev/null +++ b/metrics.go @@ -0,0 +1,51 @@ +package main + +import ( + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promhttp" + "net/http" +) + +var ( + counterContainerCheck prometheus.Counter + counterContainerCheckFailure prometheus.Counter + counterContainerRestart prometheus.Counter + counterContainerRestartFailure prometheus.Counter +) + +func initPrometheus(env envConfig, mux *http.ServeMux) { + + counterContainerCheck = prometheus.NewCounter(prometheus.CounterOpts{ + Name: "check_count", + Help: "Count how many container checks has been run", + Namespace: env.MetricsNamespace, + Subsystem: env.MetricsSubsystem, + }) + prometheus.MustRegister(counterContainerCheck) + + counterContainerCheckFailure = prometheus.NewCounter(prometheus.CounterOpts{ + Name: "check_failure_count", + Help: "Count how many container check failures happened", + Namespace: env.MetricsNamespace, + Subsystem: env.MetricsSubsystem, + }) + prometheus.MustRegister(counterContainerCheckFailure) + + counterContainerRestart = prometheus.NewCounter(prometheus.CounterOpts{ + Name: "restart_count", + Help: "Count how many container restarts has been run", + Namespace: env.MetricsNamespace, + Subsystem: env.MetricsSubsystem, + }) + prometheus.MustRegister(counterContainerRestart) + + counterContainerRestartFailure = prometheus.NewCounter(prometheus.CounterOpts{ + Name: "restart_failure_count", + Help: "Count how many container restart failures happened", + Namespace: env.MetricsNamespace, + Subsystem: env.MetricsSubsystem, + }) + prometheus.MustRegister(counterContainerRestartFailure) + + mux.Handle(env.MetricsPath, promhttp.Handler()) +} diff --git a/overall-diagram.png b/overall-diagram.png new file mode 100644 index 0000000..99330c3 Binary files /dev/null and b/overall-diagram.png differ diff --git a/prom_file_handler.go b/prom_file_handler.go new file mode 100644 index 0000000..8f85f4f --- /dev/null +++ b/prom_file_handler.go @@ -0,0 +1,50 @@ +package main + +import ( + "encoding/json" + "fmt" + "io/ioutil" + "strings" + "syscall" +) + +type promHandler struct { + config envConfig +} + +func newPromFileHandler(config envConfig) (*promHandler, error) { + + if !strings.HasSuffix(config.PrometheusConfigFilePath, ".json") { + return nil, fmt.Errorf("file dose not have .json extension") + } + + err := syscall.Access(config.PrometheusConfigFilePath, syscall.O_RDWR) + if err != nil { + return nil, err + } + + handler := &promHandler{ + config: config, + } + + return handler, nil +} + +func (h *promHandler) write(containersScrapeConfig map[string]containerScrapeConfig) error { + + targetGroups := make([]containerScrapeConfig, 0, len(containersScrapeConfig)) + for _, v := range containersScrapeConfig { + targetGroups = append(targetGroups, v) + } + data, err := json.Marshal(targetGroups) + if err != nil { + return err + } + log.Debugf("Write %s to %s", string(data), h.config.PrometheusConfigFilePath) + err = ioutil.WriteFile(h.config.PrometheusConfigFilePath, data, 0644) + if err != nil { + return err + } + + return err +} diff --git a/utils.go b/utils.go new file mode 100644 index 0000000..17b9d3f --- /dev/null +++ b/utils.go @@ -0,0 +1,54 @@ +package main + +import ( + "github.com/docker/docker/api/types/network" + "github.com/docker/go-connections/nat" + "strings" +) + +func getFromMapOrDefault(key string, m map[string]string, defaultValue string) string { + v, ok := m[key] + if ok { + return v + } else { + return defaultValue + } +} + +func getContainerPortsNetworkConfig(ports nat.PortMap) []nat.Port { + keys := make([]nat.Port, len(ports)) + i := 0 + for p := range ports { + keys[i] = p + i++ + } + return keys +} + +func getNetworkNamesFromNetworks(m map[string]*network.EndpointSettings) []string { + keys := make([]string, len(m)) + i := 0 + for k := range m { + keys[i] = k + i++ + } + return keys +} + +// parseCSLabels parses a string of the format k1:v1,k2:k2,... +func parseCSLabels(labels string) map[string]string { + m := make(map[string]string) + if labels == "" { + return m + } + ss := strings.Split(labels, ",") + for _, pair := range ss { + z := strings.Split(pair, ":") + if len(z) < 2 { + m[z[0]] = "" + } else { + m[z[0]] = strings.Join(z[1:], ":") + } + } + return m +}