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handlers.go
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handlers.go
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package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"strings"
"github.com/gorilla/mux"
dockerimagesave "github.com/jadolg/DockerImageSave"
)
// PullImageHandler handles pulling a docker image
func PullImageHandler(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
user := dockerimagesave.Sanitize(params["user"])
imageID := dockerimagesave.Sanitize(params["id"])
if user != "" {
imageID = user + "/" + imageID
}
imageExists, err := dockerimagesave.ImageExists(imageID)
if err != nil {
log.Printf("Error checking if image '%s' exists locally", imageID)
errorsTotalMetric.Inc()
_ = json.NewEncoder(w).Encode(dockerimagesave.PullResponse{ID: imageID, Error: err.Error(), Status: "Error"})
return
}
log.Printf("Requested pulling image '%s'", imageID)
if !imageExists {
log.Printf("Image '%s' does not exist locally", imageID)
existsInRegistry, err := dockerimagesave.ImageExistsInRegistry(imageID)
if err == nil && existsInRegistry {
log.Printf("Image '%s' exists in registry. Pulling image.", imageID)
go func() {
// TODO: This strategy is just plain stupid. Rework into a queue.
err2 := dockerimagesave.PullImage(imageID)
if err2 != nil {
errorsTotalMetric.Inc()
log.Printf("Error pulling image %s: %v", imageID, err2)
return
}
pullsCountMetric.Inc()
}()
log.Printf("Responding image '%s' is still being downloaded.", imageID)
_ = json.NewEncoder(w).Encode(dockerimagesave.PullResponse{ID: imageID, Status: "Downloading"})
return
}
log.Printf("Image '%s' does not exist in registry.", imageID)
_ = json.NewEncoder(w).Encode(dockerimagesave.PullResponse{ID: imageID, Error: "Can't find image in DockerHub", Status: "Error"})
return
}
log.Printf("Image '%s' was already pulled.", imageID)
_ = json.NewEncoder(w).Encode(dockerimagesave.PullResponse{ID: imageID, Status: "Downloaded"})
}
// SaveImageHandler handles saving a docker image
func SaveImageHandler(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
user := dockerimagesave.Sanitize(params["user"])
user = dockerimagesave.RemoveDoubleDots(user)
imageID := dockerimagesave.Sanitize(params["id"])
cleanImageID := strings.Replace(imageID, ":", "_", 1)
imageName := dockerimagesave.RemoveDoubleDots(cleanImageID)
if user != "" {
imageID = user + "/" + imageID
imageName = user + "_" + imageName
}
imageExists, err := dockerimagesave.ImageExists(imageID)
if err != nil {
errorsTotalMetric.Inc()
_ = json.NewEncoder(w).Encode(dockerimagesave.PullResponse{ID: imageID, Error: err.Error()})
return
}
log.Printf("Requested saving image '%s'.", imageID)
if imageExists {
log.Printf("Image '%s' has already being pulled.", imageID)
if !dockerimagesave.FileExists(downloadsFolder+"/"+imageName+".tar") && dockerimagesave.FileExists(downloadsFolder+"/"+imageName+".tar.zip") {
log.Printf("Image '%s' is ready to be downloaded.", imageID)
_ = json.NewEncoder(w).Encode(dockerimagesave.SaveResponse{ID: imageID,
URL: "download/" + imageName + ".tar.zip",
Size: dockerimagesave.GetFileSize(downloadsFolder + "/" + imageName + ".tar.zip"),
Status: "Ready",
})
return
}
if !dockerimagesave.FileExists(downloadsFolder + "/" + imageName + ".tar") {
log.Printf("Saving image '%s' into file %s", imageID, downloadsFolder+"/"+imageName+".tar.zip")
go func() {
err := dockerimagesave.SaveImage(imageID, downloadsFolder)
if err != nil {
errorsTotalMetric.Inc()
log.Println(err)
}
err = dockerimagesave.ZipFiles(downloadsFolder+"/"+imageName+".tar.zip", []string{downloadsFolder + "/" + imageName + ".tar"})
if err != nil {
errorsTotalMetric.Inc()
log.Println(err)
}
err = os.Remove(downloadsFolder + "/" + imageName + ".tar")
if err != nil {
log.Print(err)
}
log.Printf("Removed uncompressed image file '%s'", downloadsFolder+"/"+imageName+".tar")
}()
}
log.Printf("Responding image '%s' is still being saved.", imageID)
_ = json.NewEncoder(w).Encode(dockerimagesave.SaveResponse{ID: imageID,
URL: "download/" + imageName + ".tar.zip",
Status: "Saving"})
} else {
log.Printf("Image '%s' has to be pulled before it's saved", imageID)
errorsTotalMetric.Inc()
_ = json.NewEncoder(w).Encode(dockerimagesave.SaveResponse{ID: imageID, Error: "Image has to be pulled first", Status: "Error"})
}
}
// HealthCheckHandler responds with data about the host
func HealthCheckHandler(w http.ResponseWriter, _ *http.Request) {
_, err := fmt.Fprintf(w, "OK")
if err != nil {
log.Print(err)
}
}
// SearchHandler handles searching images
func SearchHandler(w http.ResponseWriter, r *http.Request) {
term := r.FormValue("term")
term = dockerimagesave.Sanitize(term)
term = strings.ReplaceAll(term, " ", "%20")
search, err := dockerimagesave.Search(term)
if err != nil {
log.Printf("error searching for %s", term)
errorsTotalMetric.Inc()
_ = json.NewEncoder(w).Encode(dockerimagesave.SearchResponse{Term: term, Error: fmt.Sprintf("Error searching for: '%s'", term), Status: "Error"})
return
}
_ = json.NewEncoder(w).Encode(dockerimagesave.SearchResponse{
Term: term,
Status: "OK",
SearchResult: search,
})
}