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Merge pull request #18 from bisohns/feature/add-websocket-server
Feature/add websocket server
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,214 @@ | ||
| /* | ||
| Copyright © 2021 Bisohns | ||
| 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 cmd | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "net/http" | ||
| "os" | ||
| "strconv" | ||
| "strings" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/bisohns/saido/config" | ||
| "github.com/bisohns/saido/driver" | ||
| "github.com/bisohns/saido/inspector" | ||
| "github.com/gorilla/handlers" | ||
| "github.com/gorilla/websocket" | ||
| log "github.com/sirupsen/logrus" | ||
| "github.com/spf13/cobra" | ||
| ) | ||
|
|
||
| const ( | ||
| socketBufferSize = 1042 | ||
| messageBufferSize = 256 | ||
| ) | ||
|
|
||
| var ( | ||
| port string | ||
| server = http.NewServeMux() | ||
| upgrader = &websocket.Upgrader{ | ||
| ReadBufferSize: socketBufferSize, | ||
| WriteBufferSize: socketBufferSize, | ||
| CheckOrigin: func(r *http.Request) bool { | ||
| return true | ||
| }} | ||
| ) | ||
|
|
||
| type FullMessage struct { | ||
| Error bool | ||
| Message interface{} | ||
| } | ||
|
|
||
| type Message struct { | ||
| Host string | ||
| Name string | ||
| Data interface{} | ||
| } | ||
|
|
||
| type Client struct { | ||
| Socket *websocket.Conn | ||
| Send chan *FullMessage | ||
| } | ||
|
|
||
| // Write to websocket | ||
| func (client *Client) Write() { | ||
| defer client.Socket.Close() | ||
| var err error | ||
| for msg := range client.Send { | ||
| err = client.Socket.WriteJSON(msg) | ||
| if err != nil { | ||
| log.Error("Error inside client write ", err) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| type Hosts struct { | ||
| Config *config.Config | ||
| // Connections : hostname mapped to connection instances to reuse | ||
| // across metrics | ||
| mu sync.Mutex | ||
| Drivers map[string]*driver.Driver | ||
| Client chan *Client | ||
| Start chan bool | ||
| } | ||
|
|
||
| func (hosts *Hosts) getDriver(address string) *driver.Driver { | ||
| hosts.mu.Lock() | ||
| defer hosts.mu.Unlock() | ||
| return hosts.Drivers[address] | ||
| } | ||
|
|
||
| func (hosts *Hosts) resetDriver(host config.Host) { | ||
| hosts.mu.Lock() | ||
| defer hosts.mu.Unlock() | ||
| hostDriver := host.Connection.ToDriver() | ||
| hosts.Drivers[host.Address] = &hostDriver | ||
| } | ||
|
|
||
| func (hosts *Hosts) sendMetric(host config.Host, client *Client) { | ||
| if hosts.getDriver(host.Address) == nil { | ||
| hosts.resetDriver(host) | ||
| } | ||
| for _, metric := range config.GetDashboardInfoConfig(hosts.Config).Metrics { | ||
| initializedMetric, err := inspector.Init(metric, hosts.getDriver(host.Address)) | ||
| data, err := initializedMetric.Execute() | ||
| if err == nil { | ||
| var unmarsh interface{} | ||
| json.Unmarshal(data, &unmarsh) | ||
| message := &FullMessage{ | ||
| Message: Message{ | ||
| Host: host.Address, | ||
| Name: metric, | ||
| Data: unmarsh, | ||
| }, | ||
| Error: false, | ||
| } | ||
| client.Send <- message | ||
| } else { | ||
| // check for error 127 which means command was not found | ||
| var errorContent string | ||
| if !strings.Contains(fmt.Sprintf("%s", err), "127") { | ||
| errorContent = fmt.Sprintf("Could not retrieve metric %s from driver %s with error %s, resetting connection...", metric, host.Address, err) | ||
| } else { | ||
| errorContent = fmt.Sprintf("Command %s not found on driver %s", metric, host.Address) | ||
| } | ||
| log.Error(errorContent) | ||
| hosts.resetDriver(host) | ||
| message := &FullMessage{ | ||
| Message: errorContent, | ||
| Error: true, | ||
| } | ||
| client.Send <- message | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (hosts *Hosts) Run() { | ||
| dashboardInfo := config.GetDashboardInfoConfig(hosts.Config) | ||
| log.Debug("In Running") | ||
| for { | ||
| select { | ||
| case client := <-hosts.Client: | ||
| for { | ||
| for _, host := range dashboardInfo.Hosts { | ||
| go hosts.sendMetric(host, client) | ||
| } | ||
| log.Infof("Delaying for %d seconds", dashboardInfo.PollInterval) | ||
| time.Sleep(time.Duration(dashboardInfo.PollInterval) * time.Second) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| } | ||
|
|
||
| func (hosts *Hosts) ServeHTTP(w http.ResponseWriter, req *http.Request) { | ||
| socket, err := upgrader.Upgrade(w, req, nil) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| return | ||
| } | ||
| client := &Client{ | ||
| Socket: socket, | ||
| Send: make(chan *FullMessage, messageBufferSize), | ||
| } | ||
| hosts.Client <- client | ||
| client.Write() | ||
| } | ||
|
|
||
| func newHosts(cfg *config.Config) *Hosts { | ||
| hosts := &Hosts{ | ||
| Config: cfg, | ||
| Drivers: make(map[string]*driver.Driver), | ||
| Client: make(chan *Client), | ||
| } | ||
| return hosts | ||
| } | ||
|
|
||
| func setHostHandler(w http.ResponseWriter, r *http.Request) { | ||
| b, _ := json.Marshal("Hello World") | ||
| w.Write(b) | ||
| } | ||
|
|
||
| var apiCmd = &cobra.Command{ | ||
| Use: "api", | ||
| Short: "host saido as an API on a PORT env variable, fallback to set argument", | ||
| Long: ``, | ||
| Run: func(cmd *cobra.Command, args []string) { | ||
| // server.HandleFunc("/set-hosts", SetHostHandler) | ||
| // FIXME: set up cfg using set-hosts endpoint | ||
| hosts := newHosts(cfg) | ||
| server.HandleFunc("/set-hosts", setHostHandler) | ||
| server.Handle("/metrics", hosts) | ||
| log.Info("listening on :", port) | ||
| _, err := strconv.Atoi(port) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| go hosts.Run() | ||
| loggedRouters := handlers.LoggingHandler(os.Stdout, server) | ||
| if err := http.ListenAndServe(":"+port, loggedRouters); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| }, | ||
| } | ||
|
|
||
| func init() { | ||
| apiCmd.Flags().StringVarP(&port, "port", "p", "3000", "Port to run application server on") | ||
| rootCmd.AddCommand(apiCmd) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -29,4 +29,5 @@ hosts: | |
|
|
||
| metrics: | ||
| - memory | ||
| - cpu | ||
| - tcp | ||
| poll-interval: 30 | ||
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