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api.go
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api.go
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package api
import (
"encoding/json"
"io"
"io/ioutil"
"net/http"
"github.com/ajvb/kala/api/middleware"
"github.com/ajvb/kala/job"
"github.com/ajvb/kala/utils/logging"
"github.com/codegangsta/negroni"
"github.com/gorilla/mux"
)
const (
// Base API v1 Path
ApiUrlPrefix = "/api/v1/"
JobPath = "job/"
ApiJobPath = ApiUrlPrefix + JobPath
contentType = "Content-Type"
jsonContentType = "application/json;charset=UTF-8"
)
var (
log = logging.GetLogger("kala.api")
)
type KalaStatsResponse struct {
Stats *job.KalaStats
}
// HandleKalaStatsRequest is the hanlder for getting system-level metrics
// /api/v1/stats
func HandleKalaStatsRequest(cache job.JobCache) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
resp := &KalaStatsResponse{
Stats: job.NewKalaStats(cache),
}
w.Header().Set(contentType, jsonContentType)
w.WriteHeader(http.StatusOK)
if err := json.NewEncoder(w).Encode(resp); err != nil {
log.Error("Error occured when marshalling response: %s", err)
return
}
}
}
type ListJobStatsResponse struct {
JobStats []*job.JobStat `json:"job_stats"`
}
// HandleListJobStatsRequest is the handler for getting job-specific stats
// /api/v1/job/stats/{id}
func HandleListJobStatsRequest(cache job.JobCache) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
j, err := cache.Get(id)
if err != nil {
log.Error("Error occured when trying to get the job you requested.")
w.WriteHeader(http.StatusNotFound)
return
}
if j == nil {
w.WriteHeader(http.StatusNotFound)
return
}
resp := &ListJobStatsResponse{
JobStats: j.Stats,
}
w.Header().Set(contentType, jsonContentType)
w.WriteHeader(http.StatusOK)
if err := json.NewEncoder(w).Encode(resp); err != nil {
log.Error("Error occured when marshalling response: %s", err)
return
}
}
}
type ListJobsResponse struct {
Jobs map[string]*job.Job `json:"jobs"`
}
// HandleListJobs responds with an array of all Jobs within the server,
// active or disabled.
func HandleListJobsRequest(cache job.JobCache) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
resp := &ListJobsResponse{
Jobs: cache.GetAll(),
}
w.Header().Set(contentType, jsonContentType)
w.WriteHeader(http.StatusOK)
if err := json.NewEncoder(w).Encode(resp); err != nil {
log.Error("Error occured when marshalling response: %s", err)
return
}
}
}
type AddJobResponse struct {
Id string `json:"id"`
}
func unmarshalNewJob(r *http.Request) (*job.Job, error) {
newJob := &job.Job{}
body, err := ioutil.ReadAll(io.LimitReader(r.Body, 1048576))
if err != nil {
log.Error("Error occured when reading r.Body: %s", err)
return nil, err
}
defer r.Body.Close()
if err := json.Unmarshal(body, newJob); err != nil {
log.Error("Error occured when unmarshalling data: %s", err)
return nil, err
}
return newJob, nil
}
// HandleAddJob takes a job object and unmarshals it to a Job type,
// and then throws the job in the schedulers.
func HandleAddJob(cache job.JobCache) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
newJob, err := unmarshalNewJob(r)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
err = newJob.Init(cache)
if err != nil {
errStr := "Error occured when initializing the job"
log.Error(errStr+": %s", err)
http.Error(w, errStr, http.StatusBadRequest)
return
}
resp := &AddJobResponse{
Id: newJob.Id,
}
w.Header().Set(contentType, jsonContentType)
w.WriteHeader(http.StatusCreated)
if err := json.NewEncoder(w).Encode(resp); err != nil {
log.Error("Error occured when marshalling response: %s", err)
return
}
}
}
// HandleJobRequest routes requests to /api/v1/job/{id} to either
// handleDeleteJob if its a DELETE or handleGetJob if its a GET request.
func HandleJobRequest(cache job.JobCache, db job.JobDB) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
j, err := cache.Get(id)
if err != nil {
log.Error("Error occured when trying to get the job you requested.")
w.WriteHeader(http.StatusNotFound)
return
}
if j == nil {
w.WriteHeader(http.StatusNotFound)
return
}
if r.Method == "DELETE" {
j.Delete(cache, db)
w.WriteHeader(http.StatusNoContent)
} else if r.Method == "GET" {
handleGetJob(w, r, j)
}
}
}
type JobResponse struct {
Job *job.Job `json:"job"`
}
func handleGetJob(w http.ResponseWriter, r *http.Request, j *job.Job) {
resp := &JobResponse{
Job: j,
}
w.Header().Set(contentType, jsonContentType)
w.WriteHeader(http.StatusOK)
if err := json.NewEncoder(w).Encode(resp); err != nil {
log.Error("Error occured when marshalling response: %s", err)
return
}
}
// HandleStartJobRequest is the handler for manually starting jobs
// /api/v1/job/start/{id}
func HandleStartJobRequest(cache job.JobCache) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
j, err := cache.Get(id)
if err != nil {
log.Error("Error occured when trying to get the job you requested.")
w.WriteHeader(http.StatusNotFound)
return
}
if j == nil {
w.WriteHeader(http.StatusNotFound)
return
}
j.Run(cache)
w.WriteHeader(http.StatusNoContent)
}
}
// SetupApiRoutes is used within main to initialize all of the routes
func SetupApiRoutes(r *mux.Router, cache job.JobCache, db job.JobDB) {
// Route for creating a job
r.HandleFunc(ApiJobPath, HandleAddJob(cache)).Methods("POST")
r.HandleFunc(ApiUrlPrefix+"job", HandleAddJob(cache)).Methods("POST")
// Route for deleting and getting a job
r.HandleFunc(ApiJobPath+"{id}", HandleJobRequest(cache, db)).Methods("DELETE", "GET")
r.HandleFunc(ApiJobPath+"{id}/", HandleJobRequest(cache, db)).Methods("DELETE", "GET")
// Route for getting job stats
r.HandleFunc(ApiJobPath+"stats/{id}", HandleListJobStatsRequest(cache)).Methods("GET")
r.HandleFunc(ApiJobPath+"stats/{id}/", HandleListJobStatsRequest(cache)).Methods("GET")
// Route for listing all jops
r.HandleFunc(ApiJobPath, HandleListJobsRequest(cache)).Methods("GET")
r.HandleFunc(ApiUrlPrefix+"job", HandleListJobsRequest(cache)).Methods("GET")
// Route for manually start a job
r.HandleFunc(ApiJobPath+"start/{id}", HandleStartJobRequest(cache)).Methods("POST")
r.HandleFunc(ApiJobPath+"start/{id}/", HandleStartJobRequest(cache)).Methods("POST")
// Route for getting app-level metrics
r.HandleFunc(ApiUrlPrefix+"stats", HandleKalaStatsRequest(cache)).Methods("GET")
r.HandleFunc(ApiUrlPrefix+"stats/", HandleKalaStatsRequest(cache)).Methods("GET")
}
func StartServer(listenAddr string, cache job.JobCache, db job.JobDB) error {
r := mux.NewRouter()
SetupApiRoutes(r, cache, db)
n := negroni.New(negroni.NewRecovery(), &middleware.Logger{log})
n.UseHandler(r)
return http.ListenAndServe(listenAddr, n)
}