First working? version with persistent state
This commit is contained in:
parent
4eb1f18bf5
commit
8a1cf0456a
18
main.go
18
main.go
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@ -3,6 +3,9 @@ package main
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import (
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"log"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"gitlab.hamburg.ccc.de/ccchh/spaceapid/handlers"
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"gitlab.hamburg.ccc.de/ccchh/spaceapid/util"
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@ -15,10 +18,23 @@ func main() {
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log.Println("Reading initial SpaceAPI response from", config.TemplatePath)
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spaceApiResponse := util.ParseTemplate(config.TemplatePath)
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// Merge old state if present
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util.MergeOldState(&spaceApiResponse)
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// Register HTTP handlers
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http.HandleFunc("/", handlers.Root(&spaceApiResponse))
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http.HandleFunc("/state/open", handlers.StateOpen(config.BAUsername, config.BAPassword, &spaceApiResponse))
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// Start webserver
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log.Println("Starting HTTP server...")
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log.Fatalln(http.ListenAndServe(":8080", nil))
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go log.Fatalln(http.ListenAndServe(":8080", nil))
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// Wait for exit signal
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sc := make(chan os.Signal, 1)
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signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM)
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<-sc
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// Save state for next run
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log.Println("Saving state and shutting down...")
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util.SaveCurrentState(spaceApiResponse)
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}
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@ -38,3 +38,10 @@ type SpaceAPIResponseV14 struct {
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URL string `json:"url"`
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} `json:"links"`
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}
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type PersistentStateV14 struct {
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State struct {
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Open bool `json:"open"`
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LastChange int64 `json:"lastchange"`
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} `json:"state"`
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}
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78
util/util.go
78
util/util.go
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@ -3,13 +3,17 @@ package util
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import (
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"bytes"
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"encoding/json"
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"errors"
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"log"
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"os"
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"path"
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"slices"
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"gitlab.hamburg.ccc.de/ccchh/spaceapid/types"
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)
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const savedStateJSONPath = "/var/lib/spaceapid/spaceapid-state.json"
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// ParseTemplate parses the given file and
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func ParseTemplate(file string) (resp types.SpaceAPIResponseV14) {
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@ -34,3 +38,77 @@ func ParseTemplate(file string) (resp types.SpaceAPIResponseV14) {
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return
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}
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// MergeOldState merges a given SpaceAPIResponse with the state saved at the time of last program exit and then deletes
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// the file containing the old state.
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func MergeOldState(response *types.SpaceAPIResponseV14) {
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var (
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err error
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oldState []byte
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)
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// Create state directory if not present
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err = os.MkdirAll(path.Dir(savedStateJSONPath), 0750)
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if err != nil {
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log.Fatalln("Failed creating", savedStateJSONPath, ", aborting... error:", err)
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}
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// Check if state.json is present
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_, err = os.Stat(savedStateJSONPath)
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if err != nil {
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log.Println("Old state json not accessible at", savedStateJSONPath, ", skipping merge... error:", err)
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if errors.Is(err, os.ErrNotExist) {
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return
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}
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goto removeOld
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}
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// Read file and merge
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oldState, err = os.ReadFile(savedStateJSONPath)
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if err != nil {
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log.Println("Error reading old state from", savedStateJSONPath, ", skipping merge... error:", err)
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goto removeOld
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}
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err = json.Unmarshal(oldState, response)
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if err != nil {
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log.Println(savedStateJSONPath, "doesn't seem to contain valid data... error:", err)
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goto removeOld
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}
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// Delete old state json
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removeOld:
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err = os.RemoveAll(savedStateJSONPath)
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if err != nil {
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log.Println("Failed to remove", savedStateJSONPath, ", continuing... error:", err)
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}
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}
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func SaveCurrentState(response types.SpaceAPIResponseV14) {
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file, err := os.OpenFile(savedStateJSONPath, os.O_RDWR|os.O_CREATE, 0644)
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if err != nil {
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log.Fatalln("Failed opening", savedStateJSONPath, "while trying to save current state... error:", err)
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}
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defer func(file *os.File) {
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_ = file.Close()
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}(file)
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// Create persistent state
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persistentStateV14 := types.PersistentStateV14{
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State: struct {
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Open bool `json:"open"`
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LastChange int64 `json:"lastchange"`
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}{Open: response.State.Open, LastChange: response.State.LastChange},
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}
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// Serialize persistent state
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marshal, err := json.MarshalIndent(persistentStateV14, "", "\t")
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if err != nil {
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log.Fatalln("Failed serializing persistent state... error:", err)
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}
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// Write to file
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_, err = file.Write(marshal)
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if err != nil {
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log.Fatalln("Failed writing persistent state to file", file.Name(), "... error:", err)
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}
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}
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