cityuni-webserver/pageHandler/go-info-page.go

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package pageHandler
import (
"golang.captainalm.com/cityuni-webserver/conf"
"golang.captainalm.com/cityuni-webserver/utils/info"
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"golang.captainalm.com/cityuni-webserver/utils/io"
"html/template"
"net/url"
"os"
"path"
"runtime"
"sync"
"time"
)
const templateName = "goinfo.go.html"
func newGoInfoPage(handlerIn *PageHandler, dataStore string, cacheTemplates bool) *goInfoPage {
var ptm *sync.Mutex
if cacheTemplates {
ptm = &sync.Mutex{}
}
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pageToReturn := &goInfoPage{
Handler: handlerIn,
DataStore: dataStore,
PageTemplateMutex: ptm,
}
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return pageToReturn
}
type goInfoPage struct {
Handler *PageHandler
DataStore string
PageTemplateMutex *sync.Mutex
PageTemplate *template.Template
}
func (gipg *goInfoPage) GetCacheIDExtension(urlParameters url.Values) string {
if urlParameters.Has("full") {
return "full"
} else {
return ""
}
}
type goInfoTemplateMarshal struct {
FullOutput bool
RegisteredPages []string
CachedPages []string
ProcessID int
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ParentProcessID int
ProductLocation string
ProductName string
ProductDescription string
BuildVersion string
BuildDate string
WorkingDirectory string
Hostname string
PageSize int
GoVersion string
GoRoutineNum int
GoCGoCallNum int64
NumCPU int
GoRoot string
GoMaxProcs int
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Compiler string
GoArch string
GoOS string
ListenSettings conf.ListenYaml
ServeSettings conf.ServeYaml
Environment []string
}
func (gipg *goInfoPage) GetPath() string {
return "/goinfo.go"
}
func (gipg *goInfoPage) GetLastModified() time.Time {
return time.Now()
}
func (gipg *goInfoPage) GetContents(urlParameters url.Values) (contentType string, contents []byte, canCache bool) {
theTemplate, err := gipg.getPageTemplate()
if err != nil {
return "text/plain", []byte("Cannot Get Info.\r\n" + err.Error()), false
}
var regPages []string
var cacPages []string
env := make([]string, 0)
if urlParameters.Has("full") {
regPages = gipg.Handler.GetRegisteredPages()
cacPages = gipg.Handler.GetCachedPages()
env = os.Environ()
} else {
regPages = make([]string, len(gipg.Handler.PageProviders))
cacPages = make([]string, gipg.Handler.GetNumberOfCachedPages())
}
theBuffer := &io.BufferedWriter{}
err = theTemplate.ExecuteTemplate(theBuffer, templateName, &goInfoTemplateMarshal{
FullOutput: urlParameters.Has("full"),
RegisteredPages: regPages,
CachedPages: cacPages,
ProcessID: os.Getpid(),
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ParentProcessID: os.Getppid(),
ProductLocation: getStringOrError(os.Executable),
ProductName: info.BuildName,
ProductDescription: info.BuildDescription,
BuildVersion: info.BuildVersion,
BuildDate: info.BuildDate,
WorkingDirectory: getStringOrError(os.Getwd),
Hostname: getStringOrError(os.Hostname),
PageSize: os.Getpagesize(),
GoVersion: runtime.Version(),
GoRoutineNum: runtime.NumGoroutine(),
GoCGoCallNum: runtime.NumCgoCall(),
NumCPU: runtime.NumCPU(),
GoRoot: runtime.GOROOT(),
GoMaxProcs: runtime.GOMAXPROCS(0),
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Compiler: runtime.Compiler,
GoArch: runtime.GOARCH,
GoOS: runtime.GOOS,
ListenSettings: info.ListenSettings,
ServeSettings: info.ServeSettings,
Environment: env,
})
if err != nil {
return "text/plain", []byte("Cannot Get Info.\r\n" + err.Error()), false
}
return "text/html", theBuffer.Data, false
}
func (gipg *goInfoPage) PurgeTemplate() {
if gipg.PageTemplateMutex != nil {
gipg.PageTemplateMutex.Lock()
gipg.PageTemplate = nil
gipg.PageTemplateMutex.Unlock()
}
}
func (gipg *goInfoPage) getPageTemplate() (*template.Template, error) {
if gipg.PageTemplateMutex != nil {
gipg.PageTemplateMutex.Lock()
defer gipg.PageTemplateMutex.Unlock()
}
if gipg.PageTemplate == nil {
thePath := templateName
if gipg.DataStore != "" {
thePath = path.Join(gipg.DataStore, thePath)
}
loadedData, err := os.ReadFile(thePath)
if err != nil {
return nil, err
}
tmpl, err := template.New(templateName).Parse(string(loadedData))
if err != nil {
return nil, err
}
if gipg.PageTemplateMutex != nil {
gipg.PageTemplate = tmpl
}
return tmpl, nil
} else {
return gipg.PageTemplate, nil
}
}
func getStringOrError(funcIn func() (string, error)) string {
toReturn, err := funcIn()
if err == nil {
return toReturn
} else {
return "Error: " + err.Error()
}
}