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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright {yyyy} {name of copyright owner} + + 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. diff --git a/README.md b/README.md index 80abee3..f766427 100644 --- a/README.md +++ b/README.md @@ -1 +1,87 @@ # DroveDNS + +## Name + +*drovedns* - DNS answers for apps runing on drove + +## Description + +The plugins can be used to implement service discovery through dns for apps running on drove. Plugin answers with SRV record for container discovery, optionally forward plugin can be used to add A record of drove-gateway + +## Compilation + +This package will always be compiled as part of CoreDNS and not in a standalone way. It will require you to use `go get` or as a dependency on [plugin.cfg](https://github.com/coredns/coredns/blob/master/plugin.cfg). + +The [manual](https://coredns.io/manual/toc/#what-is-coredns) will have more information about how to configure and extend the server with external plugins. + +A simple way to consume this plugin, is by adding the following on [plugin.cfg](https://github.com/coredns/coredns/blob/master/plugin.cfg), and recompile it as [detailed on coredns.io](https://coredns.io/2017/07/25/compile-time-enabling-or-disabling-plugins/#build-with-compile-time-configuration-file). + +~~~ +drove:github.com/PhonePe/coredns-drove +~~~ + +Put this early in the plugin list, so that *drovedns* is executed before any of the other plugins. + +After this you can compile coredns by: + +``` sh +go generate +go build +``` + +Or you can instead use make: + +``` sh +make +``` + +## Syntax + +~~~ txt +drovedns { + endpoint [URL] + accesstoken [TOKEN] + user [USERNAME] + pass [PASSWORD] + skip_ssl_check +} +~~~ +* `URL` - Comma seperated list of drove controllers +* `TOKEN` - In case drove controllers are using bearer auth Complete Authorization header "Bearer ..." +* `user` `pass` - In case drove is using basic auth +* `skip_ssl_check` - To skip client side ssl certificate validation + +## Ready + +This plugin reports readiness to the ready plugin. It will be immediately ready. + +## Metrics + +If monitoring is enabled (via the *prometheus* plugin) then the following metrics are exported: + +* `coredns_drove_controller_health{host}` - Exports the health of controller at any given point +The following are client level metrics to monitor apiserver request latency & status codes. `verb` identifies the apiserver [request type](https://kubernetes.io/docs/reference/using-api/api-concepts/#single-resource-api) and `host` denotes the apiserver endpoint. +* `coredns_drove_sync_total` - captures total app syncs from drove. +* `coredns_drove_sync_failure` - captures failed app syncs from drove. +* `coredns_drove_api_total{status_code, method, host}` - captures drove request grouped by `status_code`, `method` & `host`. + + + +## Examples + +In this configuration, we resolve queries through the plugin and enrich the answers with A record from servers listed in local resolv.conf + +~~~ corefile +example.drove.gateway.com { + drovedns { + endpoint "http://drove-control001.example.com:8080,http://drove-control002.example.com:8080" + accesstoken "Bearer foo" + } + forward . /etc/resolv.conf +} +~~~ + + +## Also See + +See the [manual](https://coredns.io/manual). diff --git a/api.go b/api.go new file mode 100644 index 0000000..4fe06e8 --- /dev/null +++ b/api.go @@ -0,0 +1,108 @@ +package drovedns + +import ( + "fmt" + "sync" +) + +// Host struct +type Host struct { + Host string + Port int32 + PortType string +} + +type HostGroup struct { + Hosts []Host + Tags map[string]string +} + +// App struct +type App struct { + ID string + Vhost string + Hosts []Host + Tags map[string]string + Groups map[string]HostGroup +} + +type DroveServiceHost struct { + Host string `json:"host"` + Port int32 `json:"port"` + PortType string `json:"portType"` +} + +// DroveAppsResponse struct for our apps nested with tasks. +type DroveAppsResponse struct { + Status string `json:"status"` + Apps []DroveApp `json:"data"` + Message string `json:"message"` +} + +type DroveApp struct { + ID string `json:"appId"` + Vhost string `json:"vhost"` + Tags map[string]string `json:"tags"` + Hosts []DroveServiceHost `json:"hosts"` +} + +type DroveEventSummary struct { + EventsCount map[string]interface{} `json:"eventsCount"` + LastSyncTime int64 `json:"lastSyncTime"` +} + +type DroveEventsApiResponse struct { + Status string `json:"status"` + EventSummary DroveEventSummary `json:"data"` + Message string `json:"message"` +} + +type LeaderController struct { + Endpoint string + Host string + Port int32 +} + +type EndpointStatus struct { + Endpoint string + Healthy bool + Message string +} + +type CurrSyncPoint struct { + sync.RWMutex + LastSyncTime int64 +} + +type DroveAuthConfig struct { + User string + Pass string + AccessToken string +} + +func (dc DroveAuthConfig) Validate() error { + if dc.User == "" && dc.Pass == "" && dc.AccessToken == "" { + return fmt.Errorf("User-pass or AccessToken should be set") + } + if (dc.Pass != "" || dc.User != "") && dc.AccessToken != "" { + return fmt.Errorf("Both user-pass and access token should not be set") + } + return nil +} + +type DroveConfig struct { + Endpoint string + AuthConfig DroveAuthConfig + SkipSSL bool +} + +func (dc DroveConfig) Validate() error { + if dc.Endpoint == "" { + return fmt.Errorf("Endpoint Cant be empty") + } + return dc.AuthConfig.Validate() +} + +func NewDroveConfig() DroveConfig { + return DroveConfig{SkipSSL: false, AuthConfig: DroveAuthConfig{}} +} diff --git a/cmd/coredns/example/Corefile b/cmd/coredns/example/Corefile new file mode 100644 index 0000000..57cd416 --- /dev/null +++ b/cmd/coredns/example/Corefile @@ -0,0 +1,12 @@ +.:1053 { + log + whoami + cache 30 + ready + forward . /etc/resolv.conf + metrics + drove { + endpoint "https://drovecontrol001.exmaple.com:8080,https://drovecontrol002.exmaple.com:8080,https://drovecontrol003.exmaple.com:8080:8080" + access_token "Bearer " + } +} \ No newline at end of file diff --git a/cmd/coredns/main.go b/cmd/coredns/main.go new file mode 100644 index 0000000..1c401a0 --- /dev/null +++ b/cmd/coredns/main.go @@ -0,0 +1,29 @@ +package main + +//go:generate go run directives_generate.go +//go:generate go run owners_generate.go + +import ( + "github.com/coredns/coredns/core/dnsserver" + _ "github.com/coredns/coredns/core/plugin" // Plug in CoreDNS. + "github.com/coredns/coredns/coremain" + _ "phonepe.com/drovedns" +) + +var directives = []string{ + "log", + "drove", + "forward", + "ready", + "whoami", + "cache", + "startup", + "shutdown", +} + +func init() { + dnsserver.Directives = directives +} +func main() { + coremain.Run() +} diff --git a/drove.go b/drove.go new file mode 100644 index 0000000..29a98ae --- /dev/null +++ b/drove.go @@ -0,0 +1,255 @@ +package drovedns + +import ( + "context" + "crypto/tls" + "encoding/json" + "errors" + "fmt" + "net" + "net/http" + "net/url" + "strconv" + "strings" + "sync" + "time" +) + +const ( + FETCH_APP_TIMEOUT time.Duration = time.Duration(5) * time.Second + FETCH_EVENTS_TIMEOUT time.Duration = time.Duration(5) * time.Second + PING_TIMEOUT time.Duration = time.Duration(5) * time.Second +) + +type IDroveClient interface { + FetchApps() (*DroveAppsResponse, error) + FetchRecentEvents(syncPoint *CurrSyncPoint) (*DroveEventSummary, error) + PollEvents(callback func(event *DroveEventSummary)) +} +type DroveClient struct { + EndpointMutex sync.RWMutex + Endpoint []EndpointStatus + Leader *LeaderController + AuthConfig *DroveAuthConfig + client *http.Client +} + +func NewDroveClient(config DroveConfig) DroveClient { + controllerEndpoints := strings.Split(config.Endpoint, ",") + endpoints := make([]EndpointStatus, len(controllerEndpoints)) + for i, e := range controllerEndpoints { + endpoints[i] = EndpointStatus{e, true, ""} + } + tr := &http.Transport{MaxIdleConnsPerHost: 10, TLSClientConfig: &tls.Config{InsecureSkipVerify: config.SkipSSL}} + httpClient := &http.Client{ + Timeout: 0 * time.Second, + Transport: tr, + CheckRedirect: func(req *http.Request, via []*http.Request) error { + return http.ErrUseLastResponse + }, + } + return DroveClient{Endpoint: endpoints, AuthConfig: &config.AuthConfig, client: httpClient} +} + +func (c *DroveClient) Init() error { + c.updateHealth() + c.endpointHealth() + _, err := c.endpoint() + return err +} +func (c *DroveClient) getRequest(path string, timeout time.Duration, obj any) error { + host, err := c.endpoint() + if err != nil { + return err + } + endpoint := host + path + ctx, cancel := context.WithTimeout(context.Background(), timeout) + defer cancel() + req, err := http.NewRequestWithContext(ctx, "GET", endpoint, nil) + if err != nil { + return err + } + + setHeaders(*c.AuthConfig, req) + resp, err := c.client.Do(req) + if err != nil { + DroveApiRequests.WithLabelValues("err", "GET", host).Inc() + return err + } + DroveApiRequests.WithLabelValues(strconv.Itoa(resp.StatusCode), "GET", host).Inc() + defer resp.Body.Close() + decoder := json.NewDecoder(resp.Body) + + err = decoder.Decode(obj) + if err != nil { + return err + } + return nil +} + +func (c *DroveClient) FetchApps() (*DroveAppsResponse, error) { + + jsonapps := &DroveAppsResponse{} + err := c.getRequest("/apis/v1/endpoints", FETCH_APP_TIMEOUT, jsonapps) + return jsonapps, err + +} + +func (c *DroveClient) FetchRecentEvents(syncPoint *CurrSyncPoint) (*DroveEventSummary, error) { + + var newEventsApiResponse = DroveEventsApiResponse{} + err := c.getRequest("/apis/v1/cluster/events/summary?lastSyncTime="+fmt.Sprint(syncPoint.LastSyncTime), FETCH_EVENTS_TIMEOUT, &newEventsApiResponse) + if err != nil { + return nil, err + } + + log.Debugf("events response %+v", newEventsApiResponse) + if newEventsApiResponse.Status != "SUCCESS" { + return nil, errors.New("Events api call failed. Message: " + newEventsApiResponse.Message) + } + + syncPoint.LastSyncTime = newEventsApiResponse.EventSummary.LastSyncTime + return &(newEventsApiResponse.EventSummary), nil +} + +func (c *DroveClient) PollEvents(callback func(event *DroveEventSummary)) { + go func() { + + syncData := CurrSyncPoint{} + refreshInterval := 2 + + ticker := time.NewTicker(time.Duration(refreshInterval) * time.Second) + for range ticker.C { + func() { + log.Debugf("Syncing... at %d", time.Now().UnixMilli()) + syncData.Lock() + defer syncData.Unlock() + eventSummary, err := c.FetchRecentEvents(&syncData) + if err != nil { + log.Errorf("unable to sync events from drove %s", err.Error()) + } else { + callback(eventSummary) + } + }() + } + }() +} + +func setHeaders(config DroveAuthConfig, req *http.Request) { + req.Header.Set("Accept", "application/json") + if config.User != "" { + req.SetBasicAuth(config.User, config.Pass) + } + if config.AccessToken != "" { + req.Header.Add("Authorization", config.AccessToken) + } +} + +func leaderController(endpoint string) (*LeaderController, error) { + if endpoint == "" { + return nil, fmt.Errorf("Empty leader endpoint") + } + + parsedUrl, err := url.Parse(endpoint) + if err != nil { + return nil, err + } + + host, port, splitErr := net.SplitHostPort(parsedUrl.Host) + if splitErr != nil { + return nil, splitErr + } + + iPort, _ := strconv.Atoi(port) + return &LeaderController{ + Endpoint: endpoint, + Host: host, + Port: int32(iPort), + }, nil +} + +func (c *DroveClient) endpoint() (string, error) { + c.EndpointMutex.RLock() + defer c.EndpointMutex.RUnlock() + var err error = nil + if c.Leader == nil || c.Leader.Endpoint == "" { + return "", errors.New("all endpoints are down") + } + return c.Leader.Endpoint, err +} + +func (c *DroveClient) refreshLeaderData() { + var endpoint string + for _, es := range c.Endpoint { + DroveControllerHealth.WithLabelValues(es.Endpoint).Set(boolToDouble(es.Healthy)) + if es.Healthy { + endpoint = es.Endpoint + } + } + + if c.Leader == nil || endpoint != c.Leader.Endpoint { + log.Infof("Looks like master shifted. Will resync app new [%s] old[%+v]", endpoint, c.Leader) + newLeader, err := leaderController(endpoint) + if err != nil { + log.Errorf("Leader struct generation failed %+v", err) + return + } + c.EndpointMutex.Lock() + defer c.EndpointMutex.Unlock() + c.Leader = newLeader + log.Infof("New leader being set leader %+v", c.Leader) + } +} + +func (c *DroveClient) endpointHealth() { + go func() { + ticker := time.NewTicker(2 * time.Second) + for { + select { + case <-ticker.C: + shouldReturn := c.updateHealth() + if shouldReturn { + return + } + } + } + }() +} + +func (c *DroveClient) updateHealth() bool { + log.Debugf("Updating health %+v", c.Endpoint) + for i, es := range c.Endpoint { + ctx, cancel := context.WithTimeout(context.Background(), PING_TIMEOUT) + defer cancel() + req, err := http.NewRequestWithContext(ctx, "GET", es.Endpoint+"/apis/v1/ping", nil) + if err != nil { + log.Errorf("an error occurred creating endpoint health request %s %s", es.Endpoint, err.Error()) + c.Endpoint[i].Healthy = false + c.Endpoint[i].Message = err.Error() + continue + } + setHeaders(*c.AuthConfig, req) + resp, err := c.client.Do(req) + if err != nil { + log.Errorf("endpoint is down %s %s", es.Endpoint, err) + c.Endpoint[i].Healthy = false + c.Endpoint[i].Message = err.Error() + continue + } + resp.Body.Close() + + if resp.StatusCode != 200 { + if resp.StatusCode != 400 { + log.Errorf("Unknown responsecode from drove %d %+v", resp.StatusCode, resp) + } + c.Endpoint[i].Healthy = false + c.Endpoint[i].Message = resp.Status + continue + } + c.Endpoint[i].Healthy = true + c.Endpoint[i].Message = "OK" + log.Debugf("Endpoint is healthy host %s", es.Endpoint) + } + c.refreshLeaderData() + return false +} diff --git a/drove_test.go b/drove_test.go new file mode 100644 index 0000000..6ccb693 --- /dev/null +++ b/drove_test.go @@ -0,0 +1,120 @@ +package drovedns + +import ( + "fmt" + "net/http" + "net/http/httptest" + "sync/atomic" + "testing" + "time" + + "github.com/stretchr/testify/assert" +) + +func TestAppFetch(t *testing.T) { + mux := http.NewServeMux() + server := httptest.NewServer(mux) + mux.HandleFunc("/apis/v1/ping", func(rw http.ResponseWriter, req *http.Request) { + // Test request parameters + // Send response to be tested + // rw.Write([]byte(`OK`)) + rw.WriteHeader(http.StatusOK) + }) + + mux.HandleFunc("/apis/v1/endpoints", func(rw http.ResponseWriter, req *http.Request) { + // Test request parameters + // Send response to be tested + // rw.Write([]byte(`OK`)) + rw.Header().Set("Content-Type", "application/json") + rw.WriteHeader(http.StatusOK) + + fmt.Fprint(rw, `{"status": "ok", "message": "ok", "data":[{"appId": "PS", "vhost": "ps.blah", "tags": {}, "hosts":[{"host": "host", "port": 1234, "portType": "http"}]}]}`) + }) + // Close the server when test finishes + defer server.Close() + + // Use Client & URL from our local test server + client := NewDroveClient(DroveConfig{Endpoint: server.URL, AuthConfig: DroveAuthConfig{AccessToken: ""}}) + client.Init() + assert.NotNil(t, client.Leader) + + apps, err := client.FetchApps() + assert.Nil(t, err) + assert.Equal(t, len(apps.Apps), 1) + assert.Equal(t, len(apps.Apps[0].Hosts), 1) +} + +func TestLeaderElection(t *testing.T) { + mux := http.NewServeMux() + server := httptest.NewServer(mux) + mux.HandleFunc("/apis/v1/ping", func(rw http.ResponseWriter, req *http.Request) { + // Test request parameters + // Send response to be tested + // rw.Write([]byte(`OK`)) + rw.WriteHeader(http.StatusForbidden) + }) + + mux2 := http.NewServeMux() + server2 := httptest.NewServer(mux2) + mux2.HandleFunc("/apis/v1/ping", func(rw http.ResponseWriter, req *http.Request) { + // Test request parameters + // Send response to be tested + // rw.Write([]byte(`OK`)) + rw.WriteHeader(http.StatusOK) + }) + + // Use Client & URL from our local test server + client := NewDroveClient(DroveConfig{Endpoint: server.URL, AuthConfig: DroveAuthConfig{AccessToken: ""}}) + client.Init() + assert.Nil(t, client.Leader) + + client1 := NewDroveClient(DroveConfig{Endpoint: "http://random.blah.endpoint.non-existent", AuthConfig: DroveAuthConfig{AccessToken: ""}}) + client1.Init() + assert.Nil(t, client1.Leader) + + client2 := NewDroveClient(DroveConfig{Endpoint: fmt.Sprintf("%s,%s", server.URL, server2.URL), AuthConfig: DroveAuthConfig{AccessToken: ""}}) + client2.Init() + assert.NotNil(t, client2.Leader) + assert.Equal(t, server2.URL, client2.Leader.Endpoint) + time.Sleep(2 * time.Second) + assert.NotNil(t, client2.Leader) + assert.Equal(t, server2.URL, client2.Leader.Endpoint) + +} + +func TestLeaderFailover(t *testing.T) { + mux := http.NewServeMux() + server := httptest.NewServer(mux) + var status1, status2 atomic.Int64 + status1.Store(200) + status2.Store(400) + + mux.HandleFunc("/apis/v1/ping", func(rw http.ResponseWriter, req *http.Request) { + // Test request parameters + // Send response to be tested + // rw.Write([]byte(`OK`)) + rw.WriteHeader(int(status1.Load())) + }) + + mux2 := http.NewServeMux() + server2 := httptest.NewServer(mux2) + mux2.HandleFunc("/apis/v1/ping", func(rw http.ResponseWriter, req *http.Request) { + // Test request parameters + // Send response to be tested + // rw.Write([]byte(`OK`)) + rw.WriteHeader(int(status2.Load())) + }) + + client := NewDroveClient(DroveConfig{Endpoint: fmt.Sprintf("%s,%s", server.URL, server2.URL), AuthConfig: DroveAuthConfig{AccessToken: ""}}) + client.Init() + assert.NotNil(t, client.Leader) + endpoint, err := client.endpoint() + assert.Equal(t, server.URL, endpoint) + status1.Store(400) + status2.Store(200) + time.Sleep(4 * time.Second) + endpoint, err = client.endpoint() + assert.Nil(t, err) + + assert.Equal(t, server2.URL, endpoint) +} diff --git a/endpoints.go b/endpoints.go new file mode 100644 index 0000000..0722780 --- /dev/null +++ b/endpoints.go @@ -0,0 +1,95 @@ +package drovedns + +import ( + "sync" + "time" +) + +type DroveEndpoints struct { + appsMutex *sync.RWMutex + AppsDB *DroveAppsResponse + DroveClient IDroveClient + AppsByVhost map[string]DroveApp +} + +func (dr *DroveEndpoints) setApps(appDB *DroveAppsResponse) { + var appsByVhost map[string]DroveApp = make(map[string]DroveApp) + if appDB != nil { + for _, app := range appDB.Apps { + appsByVhost[app.Vhost+"."] = app + } + } + dr.appsMutex.Lock() + dr.AppsDB = appDB + dr.AppsByVhost = appsByVhost + dr.appsMutex.Unlock() +} + +func (dr *DroveEndpoints) getApps() *DroveAppsResponse { + dr.appsMutex.RLock() + defer dr.appsMutex.RUnlock() + if dr.AppsDB == nil { + return nil + } + return dr.AppsDB +} + +func (dr *DroveEndpoints) searchApps(questionName string) *DroveApp { + dr.appsMutex.RLock() + defer dr.appsMutex.RUnlock() + if dr.AppsByVhost == nil { + return nil + } + if app, ok := dr.AppsByVhost[questionName]; ok { + return &app + } + return nil +} + +func newDroveEndpoints(client IDroveClient) *DroveEndpoints { + endpoints := DroveEndpoints{DroveClient: client, appsMutex: &sync.RWMutex{}} + ticker := time.NewTicker(10 * time.Second) + done := make(chan bool) + reload := make(chan bool) + endpoints.DroveClient.PollEvents(func(eventSummary *DroveEventSummary) { + if len(eventSummary.EventsCount) > 0 { + if _, ok := eventSummary.EventsCount["APP_STATE_CHANGE"]; ok { + log.Debugf("App State Change %+v", eventSummary.EventsCount["APP_STATE_CHANGE"]) + reload <- true + return + } + if _, ok := eventSummary.EventsCount["INSTANCE_STATE_CHANGE"]; ok { + log.Debugf("Instance State Change %+v", eventSummary.EventsCount["INSTANCE_STATE_CHANGE"]) + reload <- true + return + } + } + }) + go func() { + var syncApp = func() { + DroveQueryTotal.Inc() + apps, err := endpoints.DroveClient.FetchApps() + if err != nil { + DroveQueryFailure.Inc() + log.Errorf("Error refreshing nodes data") + return + } + + endpoints.setApps(apps) + } + syncApp() + for { + select { + case <-done: + return + case <-reload: + log.Debug("Refreshing Apps due to event change from drove") + syncApp() + case _ = <-ticker.C: + log.Debug("Refreshing Apps data from drove") + syncApp() + } + } + }() + return &endpoints +} diff --git a/endpoints_test.go b/endpoints_test.go new file mode 100644 index 0000000..2c445ad --- /dev/null +++ b/endpoints_test.go @@ -0,0 +1,71 @@ +package drovedns + +import ( + "fmt" + "net/http" + "net/http/httptest" + "testing" + "time" +) + +func TestRaceCondidtion(t *testing.T) { + + mux := http.NewServeMux() + server := httptest.NewServer(mux) + mux.HandleFunc("/apis/v1/ping", func(rw http.ResponseWriter, req *http.Request) { + // Test request parameters + // Send response to be tested + // rw.Write([]byte(`OK`)) + rw.WriteHeader(http.StatusOK) + }) + + mux.HandleFunc("/apis/v1/endpoints", func(rw http.ResponseWriter, req *http.Request) { + // Test request parameters + // Send response to be tested + // rw.Write([]byte(`OK`)) + rw.Header().Set("Content-Type", "application/json") + rw.WriteHeader(http.StatusOK) + + fmt.Fprint(rw, `{"status": "ok", "message": "ok", "data":[{"appId": "PS", "vhost": "ps.blah", "tags": {}, "hosts":[{"host": "host", "port": 1234, "portType": "http"}]}]}`) + }) + + mux.HandleFunc("/apis/v1/cluster/events/summary", func(rw http.ResponseWriter, req *http.Request) { + // Test request parameters + // Send response to be tested + // rw.Write([]byte(`OK`)) + rw.Header().Set("Content-Type", "application/json") + rw.WriteHeader(http.StatusOK) + + fmt.Fprint(rw, `{"status": "SUCCESS", "message": "ok", "data":{"eventsCount":{"APP_STATE_CHANGE": 1}, "lastSyncTime": 1}}`) + }) + // Close the server when test finishes + defer server.Close() + + // Use Client & URL from our local test server + client := NewDroveClient(DroveConfig{Endpoint: server.URL, AuthConfig: DroveAuthConfig{AccessToken: ""}}) + client.Init() + underTest := newDroveEndpoints(&client) + go func() { + for i := 0; i < 100; i++ { + go func() { + apps := underTest.getApps() + if apps == nil { + return + } + for i, _ := range apps.Apps { + t.Logf("%+v", apps.Apps[i].Hosts) + } + }() + } + }() + + go func() { + for i := 0; i < 100; i++ { + go func() { + underTest.setApps(&DroveAppsResponse{}) + + }() + } + }() + time.Sleep(1) +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..230e3d4 --- /dev/null +++ b/go.mod @@ -0,0 +1,141 @@ +module phonepe.com/drovedns + +go 1.20 + +require ( + github.com/coredns/caddy v1.1.1 + github.com/coredns/coredns v1.11.1 + github.com/miekg/dns v1.1.58 + github.com/prometheus/client_golang v1.18.0 + github.com/stretchr/testify v1.8.4 +) + +require ( + cloud.google.com/go/compute v1.23.0 // indirect + cloud.google.com/go/compute/metadata v0.2.3 // indirect + github.com/Azure/azure-sdk-for-go v68.0.0+incompatible // indirect + github.com/Azure/go-autorest v14.2.0+incompatible // indirect + github.com/Azure/go-autorest/autorest v0.11.29 // indirect + github.com/Azure/go-autorest/autorest/adal v0.9.22 // indirect + github.com/Azure/go-autorest/autorest/azure/auth v0.5.12 // indirect + github.com/Azure/go-autorest/autorest/azure/cli v0.4.5 // indirect + github.com/Azure/go-autorest/autorest/date v0.3.0 // indirect + github.com/Azure/go-autorest/autorest/to v0.2.0 // indirect + github.com/Azure/go-autorest/logger v0.2.1 // indirect + github.com/Azure/go-autorest/tracing v0.6.0 // indirect + github.com/DataDog/appsec-internal-go v1.0.0 // indirect + github.com/DataDog/datadog-agent/pkg/obfuscate v0.45.0-rc.1 // indirect + github.com/DataDog/datadog-agent/pkg/remoteconfig/state v0.48.0-devel.0.20230725154044-2549ba9058df // indirect + github.com/DataDog/datadog-go/v5 v5.1.1 // indirect + github.com/DataDog/go-libddwaf v1.4.2 // indirect + github.com/DataDog/go-tuf v1.0.1-0.5.2 // indirect + github.com/DataDog/sketches-go v1.2.1 // indirect + github.com/Microsoft/go-winio v0.5.2 // indirect + github.com/antonmedv/expr v1.13.0 // indirect + github.com/apparentlymart/go-cidr v1.1.0 // indirect + github.com/aws/aws-sdk-go v1.44.322 // indirect + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/coreos/go-semver v0.3.0 // indirect + github.com/coreos/go-systemd/v22 v22.3.2 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/dimchansky/utfbom v1.1.1 // indirect + github.com/dnstap/golang-dnstap v0.4.0 // indirect + github.com/dustin/go-humanize v1.0.1 // indirect + github.com/ebitengine/purego v0.5.0-alpha // indirect + github.com/emicklei/go-restful/v3 v3.10.2 // indirect + github.com/farsightsec/golang-framestream v0.3.0 // indirect + github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568 // indirect + github.com/go-logr/logr v1.2.4 // indirect + github.com/go-openapi/jsonpointer v0.19.6 // indirect + github.com/go-openapi/jsonreference v0.20.1 // indirect + github.com/go-openapi/swag v0.22.3 // indirect + github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang-jwt/jwt/v4 v4.5.0 // indirect + github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect + github.com/golang/mock v1.6.0 // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/google/gnostic v0.5.7-v3refs // indirect + github.com/google/go-cmp v0.5.9 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/google/pprof v0.0.0-20230509042627-b1315fad0c5a // indirect + github.com/google/s2a-go v0.1.4 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/googleapis/enterprise-certificate-proxy v0.2.5 // indirect + github.com/googleapis/gax-go/v2 v2.12.0 // indirect + github.com/grpc-ecosystem/grpc-opentracing v0.0.0-20180507213350-8e809c8a8645 // indirect + github.com/imdario/mergo v0.3.12 // indirect + github.com/infobloxopen/go-trees v0.0.0-20200715205103-96a057b8dfb9 // indirect + github.com/jmespath/go-jmespath v0.4.0 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/kr/text v0.2.0 // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect + github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect + github.com/mitchellh/go-homedir v1.1.0 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/onsi/ginkgo/v2 v2.11.0 // indirect + github.com/opentracing-contrib/go-observer v0.0.0-20170622124052-a52f23424492 // indirect + github.com/opentracing/opentracing-go v1.2.0 // indirect + github.com/openzipkin-contrib/zipkin-go-opentracing v0.5.0 // indirect + github.com/openzipkin/zipkin-go v0.4.2 // indirect + github.com/oschwald/geoip2-golang v1.9.0 // indirect + github.com/oschwald/maxminddb-golang v1.11.0 // indirect + github.com/outcaste-io/ristretto v0.2.1 // indirect + github.com/philhofer/fwd v1.1.2 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + github.com/prometheus/client_model v0.5.0 // indirect + github.com/prometheus/common v0.45.0 // indirect + github.com/prometheus/procfs v0.12.0 // indirect + github.com/quic-go/qtls-go1-20 v0.3.1 // indirect + github.com/quic-go/quic-go v0.37.4 // indirect + github.com/secure-systems-lab/go-securesystemslib v0.7.0 // indirect + github.com/spf13/pflag v1.0.5 // indirect + github.com/tinylib/msgp v1.1.8 // indirect + go.etcd.io/etcd/api/v3 v3.5.9 // indirect + go.etcd.io/etcd/client/pkg/v3 v3.5.9 // indirect + go.etcd.io/etcd/client/v3 v3.5.9 // indirect + go.opencensus.io v0.24.0 // indirect + go.uber.org/atomic v1.11.0 // indirect + go.uber.org/multierr v1.6.0 // indirect + go.uber.org/zap v1.17.0 // indirect + go4.org/intern v0.0.0-20211027215823-ae77deb06f29 // indirect + go4.org/unsafe/assume-no-moving-gc v0.0.0-20220617031537-928513b29760 // indirect + golang.org/x/crypto v0.18.0 // indirect + golang.org/x/exp v0.0.0-20221205204356-47842c84f3db // indirect + golang.org/x/mod v0.14.0 // indirect + golang.org/x/net v0.20.0 // indirect + golang.org/x/oauth2 v0.12.0 // indirect + golang.org/x/sys v0.16.0 // indirect + golang.org/x/term v0.16.0 // indirect + golang.org/x/text v0.14.0 // indirect + golang.org/x/time v0.3.0 // indirect + golang.org/x/tools v0.17.0 // indirect + golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect + google.golang.org/api v0.136.0 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/genproto v0.0.0-20230803162519-f966b187b2e5 // indirect + google.golang.org/genproto/googleapis/api v0.0.0-20230803162519-f966b187b2e5 // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20230807174057-1744710a1577 // indirect + google.golang.org/grpc v1.57.0 // indirect + google.golang.org/protobuf v1.31.0 // indirect + gopkg.in/DataDog/dd-trace-go.v1 v1.54.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + inet.af/netaddr v0.0.0-20220811202034-502d2d690317 // indirect + k8s.io/api v0.27.4 // indirect + k8s.io/apimachinery v0.27.4 // indirect + k8s.io/client-go v0.27.4 // indirect + k8s.io/klog/v2 v2.100.1 // indirect + k8s.io/kube-openapi v0.0.0-20230501164219-8b0f38b5fd1f // indirect + k8s.io/utils v0.0.0-20230209194617-a36077c30491 // indirect + sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect + sigs.k8s.io/yaml v1.3.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..ec00cae --- /dev/null +++ b/go.sum @@ -0,0 +1,508 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go/compute v1.23.0 h1:tP41Zoavr8ptEqaW6j+LQOnyBBhO7OkOMAGrgLopTwY= +cloud.google.com/go/compute v1.23.0/go.mod h1:4tCnrn48xsqlwSAiLf1HXMQk8CONslYbdiEZc9FEIbM= +cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY= +cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA= +github.com/Azure/azure-sdk-for-go v68.0.0+incompatible h1:fcYLmCpyNYRnvJbPerq7U0hS+6+I79yEDJBqVNcqUzU= +github.com/Azure/azure-sdk-for-go v68.0.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc= +github.com/Azure/go-autorest v14.2.0+incompatible h1:V5VMDjClD3GiElqLWO7mz2MxNAK/vTfRHdAubSIPRgs= +github.com/Azure/go-autorest v14.2.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24= +github.com/Azure/go-autorest/autorest v0.11.24/go.mod h1:G6kyRlFnTuSbEYkQGawPfsCswgme4iYf6rfSKUDzbCc= +github.com/Azure/go-autorest/autorest v0.11.29 h1:I4+HL/JDvErx2LjyzaVxllw2lRDB5/BT2Bm4g20iqYw= +github.com/Azure/go-autorest/autorest v0.11.29/go.mod h1:ZtEzC4Jy2JDrZLxvWs8LrBWEBycl1hbT1eknI8MtfAs= +github.com/Azure/go-autorest/autorest/adal v0.9.18/go.mod h1:XVVeme+LZwABT8K5Lc3hA4nAe8LDBVle26gTrguhhPQ= +github.com/Azure/go-autorest/autorest/adal v0.9.22 h1:/GblQdIudfEM3AWWZ0mrYJQSd7JS4S/Mbzh6F0ov0Xc= +github.com/Azure/go-autorest/autorest/adal v0.9.22/go.mod h1:XuAbAEUv2Tta//+voMI038TrJBqjKam0me7qR+L8Cmk= +github.com/Azure/go-autorest/autorest/azure/auth v0.5.12 h1:wkAZRgT/pn8HhFyzfe9UnqOjJYqlembgCTi72Bm/xKk= +github.com/Azure/go-autorest/autorest/azure/auth v0.5.12/go.mod h1:84w/uV8E37feW2NCJ08uT9VBfjfUHpgLVnG2InYD6cg= +github.com/Azure/go-autorest/autorest/azure/cli v0.4.5 h1:0W/yGmFdTIT77fvdlGZ0LMISoLHFJ7Tx4U0yeB+uFs4= +github.com/Azure/go-autorest/autorest/azure/cli v0.4.5/go.mod h1:ADQAXrkgm7acgWVUNamOgh8YNrv4p27l3Wc55oVfpzg= +github.com/Azure/go-autorest/autorest/date v0.3.0 h1:7gUk1U5M/CQbp9WoqinNzJar+8KY+LPI6wiWrP/myHw= 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+ "github.com/coredns/coredns/plugin" + "github.com/coredns/coredns/request" + "github.com/miekg/dns" +) + +// Example is an example plugin to show how to write a plugin. +type DroveHandler struct { + DroveEndpoints *DroveEndpoints + Next plugin.Handler +} + +func NewDroveHandler(droveClient IDroveClient) *DroveHandler { + return &DroveHandler{DroveEndpoints: newDroveEndpoints(droveClient)} + +} +func (e *DroveHandler) Name() string { return "drove" } + +func (e *DroveHandler) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) { + + a := new(dns.Msg) + if e.DroveEndpoints.getApps() == nil { + return dns.RcodeServerFailure, fmt.Errorf("Drove DNS not ready") + } + app := e.DroveEndpoints.searchApps(r.Question[0].Name) + if app != nil { + ips := iplist(app.Hosts) + + a.SetReply(r) + a.Authoritative = true + + state := request.Request{W: w, Req: r} + + log.Debugf("IPS %+v", ips[0]) + srv := make([]dns.RR, len(app.Hosts)) + + for i, h := range app.Hosts { + srv[i] = &dns.SRV{Hdr: dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeSRV, Class: state.QClass(), Ttl: 30}, + Port: uint16(h.Port), + Target: h.Host + ".", + Weight: 1, + Priority: 1, + } + } + + if state.QType() == dns.TypeSRV { + a.Answer = srv + } else { + a.Extra = srv + } + } + + if len(a.Answer) > 0 || len(a.Extra) > 0 { + if e.Next != nil { + return plugin.NextOrFailure(e.Name(), e.Next, ctx, &CombiningResponseWriter{w, a}, r) + } + w.WriteMsg(a) + return dns.RcodeSuccess, nil + + } + + // Call next plugin (if any). + return plugin.NextOrFailure(e.Name(), e.Next, ctx, w, r) +} + +func iplist(res []DroveServiceHost) []string { + ips := make([]string, len(res)) + for i, inst := range res { + ips[i] = inst.Host + } + return ips +} + +// Name implements the Handler interface. +type CombiningResponseWriter struct { + dns.ResponseWriter + answer *dns.Msg +} + +func (w *CombiningResponseWriter) WriteMsg(res *dns.Msg) error { + + res.Answer = append(res.Answer, w.answer.Answer...) + res.Extra = append(res.Extra, w.answer.Extra...) + return w.ResponseWriter.WriteMsg(res) + +} diff --git a/handler_test.go b/handler_test.go new file mode 100644 index 0000000..042e9f6 --- /dev/null +++ b/handler_test.go @@ -0,0 +1,149 @@ +package drovedns + +import ( + "context" + "encoding/json" + "net" + "testing" + "time" + + "github.com/miekg/dns" + "github.com/stretchr/testify/assert" +) + +type MockDroveClient struct{} + +func (*MockDroveClient) FetchApps() (*DroveAppsResponse, error) { + apps := &DroveAppsResponse{} + json.Unmarshal([]byte(`{"status": "ok", "message": "ok", "data":[{"appId": "PS", "vhost": "example.com", "tags": {}, "hosts":[{"host": "host", "port": 1234, "portType": "http"}]}]}`), apps) + return apps, nil +} + +func (*MockDroveClient) FetchRecentEvents(sync *CurrSyncPoint) (*DroveEventSummary, error) { + eventCount := make(map[string]interface{}) + eventCount["APP_STATE_CHANGE"] = 1 + return &DroveEventSummary{eventCount, 1}, nil +} + +func (*MockDroveClient) PollEvents(callback func(event *DroveEventSummary)) { + +} + +type MockResponseWriter struct { + dns.ResponseWriter + validator func(ms *dns.Msg) + callCounter int +} + +func (w *MockResponseWriter) WriteMsg(res *dns.Msg) error { + w.callCounter += 1 + w.validator(res) + return nil + +} + +func TestServeDNSNotReady(t *testing.T) { + + handler := DroveHandler{DroveEndpoints: newDroveEndpoints(&MockDroveClient{})} + writer := &MockResponseWriter{ + validator: func(res *dns.Msg) { + assert.Equal(t, 1, len(res.Answer), "One Answer should be returned") + assert.Equal(t, 0, len(res.Extra), "Additional should be empty") + assert.Equal(t, "host.", res.Answer[0].(*dns.SRV).Target, "'host' should be the target") + assert.Equal(t, uint16(1234), res.Answer[0].(*dns.SRV).Port, "1234 should be the port") + }} + code, err := handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example.com.", Qtype: dns.TypeSRV, Qclass: dns.ClassINET}}}) + assert.NotNil(t, err, "Error should be returned") + assert.Equal(t, dns.RcodeServerFailure, code, "Failure error code should be returned") + assert.Equal(t, 0, writer.callCounter, "Message would not be written") + +} +func TestServeDNSAnswer(t *testing.T) { + handler := NewDroveHandler(&MockDroveClient{}) + for !handler.Ready() { + time.Sleep(1) + } + writer := &MockResponseWriter{ + validator: func(res *dns.Msg) { + assert.Equal(t, 1, len(res.Answer), "One Answer should be returned") + assert.Equal(t, 0, len(res.Extra), "Additional should be empty") + assert.Equal(t, "host.", res.Answer[0].(*dns.SRV).Target, "'host' should be the target") + assert.Equal(t, uint16(1234), res.Answer[0].(*dns.SRV).Port, "1234 should be the port") + }} + code, err := handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example.com.", Qtype: dns.TypeSRV, Qclass: dns.ClassINET}}}) + assert.Nil(t, err, "Error should be nil") + assert.Equal(t, dns.RcodeSuccess, code, "SuccessCode should be returned") + assert.Less(t, 0, writer.callCounter, "Message should be written") + +} + +func TestServeDNSAdditional(t *testing.T) { + handler := NewDroveHandler(&MockDroveClient{}) + for !handler.Ready() { + time.Sleep(1) + } + writer := &MockResponseWriter{ + validator: func(res *dns.Msg) { + assert.Equal(t, 0, len(res.Answer)) + assert.Equal(t, 1, len(res.Extra)) + assert.Equal(t, "host.", res.Extra[0].(*dns.SRV).Target) + assert.Equal(t, uint16(1234), res.Extra[0].(*dns.SRV).Port) + }} + code, err := handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}}}) + assert.Nil(t, err, "Error should be nil") + assert.Equal(t, dns.RcodeSuccess, code, "SuccessCode should be returned") + assert.Less(t, 0, writer.callCounter, "Message should be written") + +} + +func TestServeDNSNoMatchingApp(t *testing.T) { + handler := NewDroveHandler(&MockDroveClient{}) + for !handler.Ready() { + time.Sleep(1) + } + writer := &MockResponseWriter{ + validator: func(res *dns.Msg) { + assert.Equal(t, 0, len(res.Answer)) + assert.Equal(t, 1, len(res.Extra)) + assert.Equal(t, "host.", res.Extra[0].(*dns.SRV).Target) + assert.Equal(t, uint16(1234), res.Extra[0].(*dns.SRV).Port) + }} + code, err := handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example2.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}}}) + assert.NotNil(t, err, "Error should be returned") + assert.Equal(t, dns.RcodeServerFailure, code, "Failure error code should be returned") + assert.Equal(t, 0, writer.callCounter, "Message should not be Written") + +} + +type MockHandler struct { + callCounter int +} + +func (h *MockHandler) ServeDNS(c context.Context, rw dns.ResponseWriter, r *dns.Msg) (int, error) { + h.callCounter += 1 + r.Answer = append(r.Answer, &dns.A{ + A: net.IPv4(1, 1, 1, 1), + }) + return 0, nil +} +func (h *MockHandler) Name() string { + return "MOCK" +} +func TestServeDNSForwarding(t *testing.T) { + handler := NewDroveHandler(&MockDroveClient{}) + mockNextHandler := MockHandler{} + handler.Next = &mockNextHandler + for !handler.Ready() { + time.Sleep(1) + } + writer := &MockResponseWriter{ + validator: func(res *dns.Msg) { + assert.Equal(t, 0, len(res.Answer)) + assert.Equal(t, 1, len(res.Extra)) + assert.Equal(t, "host.", res.Extra[0].(*dns.SRV).Target) + assert.Equal(t, uint16(1234), res.Extra[0].(*dns.SRV).Port) + }} + handler.ServeDNS(context.Background(), writer, &dns.Msg{Question: []dns.Question{dns.Question{Name: "example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}}}) + + assert.Equal(t, 1, mockNextHandler.callCounter, "Next handler should be called") +} diff --git a/metrics.go b/metrics.go new file mode 100644 index 0000000..6a5e4bc --- /dev/null +++ b/metrics.go @@ -0,0 +1,38 @@ +package drovedns + +import ( + "github.com/coredns/coredns/plugin" + + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promauto" +) + +var ( + DroveQueryTotal = promauto.NewCounter(prometheus.CounterOpts{ + Namespace: plugin.Namespace, + Subsystem: pluginName, + Name: "sync_total", + Help: "Counter of Drove sync successful", + }) + + DroveQueryFailure = promauto.NewCounter(prometheus.CounterOpts{ + Namespace: plugin.Namespace, + Subsystem: pluginName, + Name: "sync_failure", + Help: "Counter of Drove syncs failed", + }) + + DroveApiRequests = promauto.NewCounterVec(prometheus.CounterOpts{ + Namespace: plugin.Namespace, + Subsystem: pluginName, + Name: "api_total", + Help: "Drove api requests total", + }, []string{"code", "method", "host"}) + + DroveControllerHealth = promauto.NewGaugeVec(prometheus.GaugeOpts{ + Namespace: plugin.Namespace, + Subsystem: pluginName, + Name: "controller_health", + Help: "Drove controller health", + }, []string{"host"}) +) diff --git a/ready.go b/ready.go new file mode 100644 index 0000000..43c368c --- /dev/null +++ b/ready.go @@ -0,0 +1,6 @@ +package drovedns + +// Checks if apps data could be synced from drove cluster +func (e *DroveHandler) Ready() bool { + return e.DroveEndpoints.getApps() != nil +} diff --git a/setup.go b/setup.go new file mode 100644 index 0000000..2756d27 --- /dev/null +++ b/setup.go @@ -0,0 +1,75 @@ +package drovedns + +import ( + "fmt" + + "github.com/coredns/caddy" + "github.com/coredns/coredns/core/dnsserver" + "github.com/coredns/coredns/plugin" + clog "github.com/coredns/coredns/plugin/pkg/log" +) + +var pluginName = "drove" + +var log = clog.NewWithPlugin(pluginName) + +// init registers this plugin. +func init() { plugin.Register(pluginName, setup) } + +// setup is the function that gets called when the config parser see the token "example". Setup is responsible +// for parsing any extra options the example plugin may have. The first token this function sees is "example". +func setup(c *caddy.Controller) error { + + handler, err := parseAndCreate(c) + if err != nil { + return err + } + // Add the Plugin to CoreDNS, so Servers can use it in their plugin chain. + dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler { + handler.Next = next + return handler + + }) + + return nil +} + +func parseAndCreate(c *caddy.Controller) (*DroveHandler, error) { + c.Next() // Ignore "example" and give us the next token. + config := NewDroveConfig() + for c.NextBlock() { + switch c.Val() { + case "endpoint": + args := c.RemainingArgs() + if len(args) != 1 { + return nil, c.ArgErr() + } + config.Endpoint = args[0] + case "access_token": + args := c.RemainingArgs() + if len(args) != 1 { + return nil, c.ArgErr() + } + config.AuthConfig.AccessToken = args[0] + + case "user_pass": + args := c.RemainingArgs() + if len(args) != 2 { + return nil, c.ArgErr() + } + config.AuthConfig.User, config.AuthConfig.Pass = args[0], args[1] + case "skip_ssl_check": + config.SkipSSL = true + default: + return nil, fmt.Errorf("Drove: Unknown argument %s found", c.Val()) + } + } + + if err := config.Validate(); err != nil { + return nil, err + } + + drove_client := NewDroveClient(config) + drove_client.Init() + return NewDroveHandler(&drove_client), nil +} diff --git a/setup_test.go b/setup_test.go new file mode 100644 index 0000000..5ff51fc --- /dev/null +++ b/setup_test.go @@ -0,0 +1,108 @@ +package drovedns + +import ( + "testing" + + "github.com/coredns/caddy" + "github.com/stretchr/testify/assert" +) + +// TestSetup tests the various things that should be parsed by setup. +// Make sure you also test for parse errors. +func TestSetup(t *testing.T) { + tests := []struct { + config string + error bool + message string + }{ + { + `drove { + endpoint http://url.random + access_token "O-Bearer token" + }`, + false, + "Valid config", + }, + + { + `drove { + endpoint http://url.random + user_pass user pass + }`, + false, + "Valid config", + }, + { + `drove { + endpoint http://url.random 8080 + access_token token + }`, + true, + "Invalid endpoint", + }, + { + `drove { + endpoint http://url.random + access_token O-Bearer token + }`, + true, + "Invalid Access token", + }, + { + `drove { + endpoint http://url.random + user_pass user:blah + }`, + true, + "User pass should be space delimited", + }, + { + `drove { + access_token token + }`, + true, + "Missing endpoint", + }, + + { + `drove { + endpoint http://url.random + access_token token + user_pass user blah + }`, + true, + "Access TOken and user_pass cant be added", + }, + { + `drove { + endpoint http://url.random + access_token token + blaharg + }`, + true, + "Random arg cannot be added", + }, + + { + `drove { + endpoint http://url.random + access_token token + blaharg + }`, + true, + "Empty Stanza is invalid", + }, + } + + for _, tt := range tests { + c := caddy.NewTestController("drovedns", tt.config) + _, err := parseAndCreate(c) + if tt.error { + assert.Error(t, err, tt.message) + } else { + assert.NoError(t, err, tt.message) + } + + } + +} diff --git a/utils.go b/utils.go new file mode 100644 index 0000000..2cb35da --- /dev/null +++ b/utils.go @@ -0,0 +1,8 @@ +package drovedns + +func boolToDouble(varr bool) float64 { + if varr { + return 1.0 + } + return 0.0 +}