wip-http-server #45
252
cmd/main.go
252
cmd/main.go
@ -4,6 +4,8 @@ import (
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"context"
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"flag"
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"fmt"
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"io"
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"net/http"
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"os"
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"path"
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@ -23,6 +25,65 @@ var (
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scriptDir = path.Join("services", "registration")
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)
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type LocalHandler struct {
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sessionId string
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}
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func NewLocalHandler() *LocalHandler {
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return &LocalHandler{
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sessionId: "",
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}
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}
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type RequestParser interface {
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GetSessionId(*http.Request) (string, error)
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GetInput(*http.Request) ([]byte, error)
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}
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type DefaultRequestParser struct {
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}
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func(rp *DefaultRequestParser) GetSessionId(rq *http.Request) (string, error) {
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v := rq.Header.Get("X-Vise-Session")
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if v == "" {
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return "", fmt.Errorf("no session found")
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}
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return v, nil
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}
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func(rp *DefaultRequestParser) GetInput(rq *http.Request) ([]byte, error) {
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defer rq.Body.Close()
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v, err := io.ReadAll(rq.Body)
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if err != nil {
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return nil, err
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}
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return v, nil
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}
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type DefaultSessionHandler struct {
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cfgTemplate engine.Config
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rp RequestParser
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rh *LocalHandler
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dbDir string
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resourceDir string
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}
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func NewDefaultSessionHandler(dbDir string, resourceDir string, rp RequestParser, outputSize uint32, flagCount uint32) *DefaultSessionHandler {
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rh := NewLocalHandler()
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return &DefaultSessionHandler{
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cfgTemplate: engine.Config{
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OutputSize: outputSize,
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Root: "root",
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FlagCount: flagCount,
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},
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rh: rh,
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rp: rp,
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dbDir: dbDir,
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resourceDir: resourceDir,
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}
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}
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func getParser(fp string, debug bool) (*asm.FlagParser, error) {
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flagParser := asm.NewFlagParser().WithDebug()
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_, err := flagParser.Load(fp)
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@ -74,29 +135,29 @@ func getHandler(appFlags *asm.FlagParser, rs *resource.DbResource, pe *persist.P
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return ussdHandlers, nil
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}
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func getPersister(dbDir string, ctx context.Context) (*persist.Persister, error) {
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err := os.MkdirAll(dbDir, 0700)
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func(f *DefaultSessionHandler) getPersister(ctx context.Context) (*persist.Persister, error) {
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err := os.MkdirAll(f.dbDir, 0700)
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if err != nil {
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return nil, fmt.Errorf("state dir create exited with error: %v\n", err)
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}
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store := gdbmdb.NewGdbmDb()
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storeFile := path.Join(dbDir, "state.gdbm")
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storeFile := path.Join(f.dbDir, "state.gdbm")
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store.Connect(ctx, storeFile)
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pr := persist.NewPersister(store)
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return pr, nil
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}
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func getUserdataDb(dbDir string, ctx context.Context) db.Db {
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func(f *DefaultSessionHandler) getUserdataDb(ctx context.Context) db.Db {
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store := gdbmdb.NewGdbmDb()
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storeFile := path.Join(dbDir, "userdata.gdbm")
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storeFile := path.Join(f.dbDir, "userdata.gdbm")
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store.Connect(ctx, storeFile)
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return store
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}
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func getResource(resourceDir string, ctx context.Context) (resource.Resource, error) {
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func(f *DefaultSessionHandler) getResource(ctx context.Context) (resource.Resource, error) {
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store := fsdb.NewFsDb()
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err := store.Connect(ctx, resourceDir)
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err := store.Connect(ctx, f.resourceDir)
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if err != nil {
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return nil, err
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}
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@ -104,87 +165,144 @@ func getResource(resourceDir string, ctx context.Context) (resource.Resource, er
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return rfs, nil
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}
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func getEngine(cfg engine.Config, rs resource.Resource, pr *persist.Persister) *engine.DefaultEngine {
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func(f *DefaultSessionHandler) getEngine(rs resource.Resource, pr *persist.Persister, sessionId string) *engine.DefaultEngine {
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cfg := f.cfgTemplate
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cfg.SessionId = sessionId
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en := engine.NewEngine(cfg, rs)
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en = en.WithPersister(pr)
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return en
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}
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func(f *DefaultSessionHandler) writeError(w http.ResponseWriter, code int, msg string, err error) {
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w.Header().Set("X-Vise", msg + ": " + err.Error())
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w.Header().Set("Content-Length", "0")
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w.WriteHeader(code)
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_, err = w.Write([]byte{})
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if err != nil {
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w.WriteHeader(500)
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w.Header().Set("X-Vise", err.Error())
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}
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return
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}
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func(f *DefaultSessionHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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var r bool
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sessionId, err := f.rp.GetSessionId(req)
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if err != nil {
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f.writeError(w, 400, "Session missing", err)
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return
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}
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input, err := f.rp.GetInput(req)
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if err != nil {
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f.writeError(w, 400, "Input read fail", err)
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return
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}
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ctx := req.Context()
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ctx = context.WithValue(ctx, "SessionId", sessionId)
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pfp := path.Join(scriptDir, "pp.csv")
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flagParser, err := getParser(pfp, true)
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if err != nil {
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f.writeError(w, 500, "flagParser failed with error:", err)
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return
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}
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rs, err := f.getResource(ctx)
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if err != nil {
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f.writeError(w, 500, "getResource failed with error:", err)
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return
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}
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pr, err := f.getPersister(ctx)
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if err != nil {
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f.writeError(w, 500, "getPersister failed with error:", err)
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return
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}
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store := f.getUserdataDb(ctx)
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dbResource, ok := rs.(*resource.DbResource)
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if !ok {
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f.writeError(w, 500, "getHandler exited with error:", err)
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return
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}
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hl, err := getHandler(flagParser, dbResource, pr, store)
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if err != nil {
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f.writeError(w, 500, "getHandler exited with error:", err)
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return
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}
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en := f.getEngine(rs, pr, sessionId)
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en = en.WithFirst(hl.Init)
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if len(input) == 0 {
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r, err = en.Init(ctx)
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} else {
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r, err = en.Exec(ctx, input)
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}
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if err != nil {
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f.writeError(w, 500, "Engine exec fail", err)
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return
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}
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// _, err = en.Init(ctx)
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// if err != nil {
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// f.writeError(w, 500, "Engine exec fail", err)
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// return
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// }
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// err = engine.Loop(ctx, en, os.Stdin, os.Stdout)
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// if err != nil {
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// f.writeError(w, 500, "Loop exec fail", err)
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// return
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// }
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w.WriteHeader(200)
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w.Header().Set("Content-Type", "text/plain")
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_, err = en.WriteResult(ctx, w)
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if err != nil {
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f.writeError(w, 500, "Write result fail", err)
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return
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}
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_ = r
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}
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func main() {
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var host string
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var port string
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var dbDir string
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var resourceDir string
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var size uint
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var flagCount uint
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var sessionId string
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var debug bool
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flag.StringVar(&host, "h", "127.0.0.1", "http host")
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flag.StringVar(&port, "p", "7123", "http port")
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flag.StringVar(&sessionId, "session-id", "075xx2123", "session id")
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flag.StringVar(&dbDir, "dbdir", ".state", "database dir to read from")
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flag.StringVar(&resourceDir, "resourcedir", path.Join("services", "registration"), "resource dir")
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flag.BoolVar(&debug, "d", false, "use engine debug output")
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flag.UintVar(&size, "s", 160, "max size of output")
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flag.UintVar(&flagCount, "f", 16, "flag count")
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flag.Parse()
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logg.Infof("start command", "dbdir", dbDir, "resourcedir", resourceDir, "outputsize", size)
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logg.Infof("starting server", "dbdir", dbDir, "resourcedir", resourceDir, "outputsize", size, "flagCount", flagCount)
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ctx := context.Background()
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ctx = context.WithValue(ctx, "SessionId", sessionId)
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pfp := path.Join(scriptDir, "pp.csv")
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flagParser, err := getParser(pfp, true)
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rp := &DefaultRequestParser{}
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h := NewDefaultSessionHandler(dbDir, resourceDir, rp, uint32(size), uint32(flagCount))
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s := &http.Server{
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Addr: fmt.Sprintf("%s:%s", host, port),
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Handler: h,
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}
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err := s.ListenAndServe()
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if err != nil {
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os.Exit(1)
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}
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cfg := engine.Config{
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Root: "root",
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SessionId: sessionId,
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OutputSize: uint32(size),
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FlagCount: uint32(16),
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}
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rs, err := getResource(resourceDir, ctx)
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if err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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os.Exit(1)
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}
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pr, err := getPersister(dbDir, ctx)
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if err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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os.Exit(1)
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}
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store := getUserdataDb(dbDir, ctx)
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if err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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os.Exit(1)
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}
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dbResource, ok := rs.(*resource.DbResource)
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if !ok {
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os.Exit(1)
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}
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hl, err := getHandler(flagParser, dbResource, pr, store)
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if err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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os.Exit(1)
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}
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en := getEngine(cfg, rs, pr)
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en = en.WithFirst(hl.Init)
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if debug {
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en = en.WithDebug(nil)
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}
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_, err = en.Init(ctx)
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if err != nil {
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fmt.Fprintf(os.Stderr, "engine init exited with error: %v\n", err)
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os.Exit(1)
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}
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err = engine.Loop(ctx, en, os.Stdin, os.Stdout)
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if err != nil {
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fmt.Fprintf(os.Stderr, "loop exited with error: %v\n", err)
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fmt.Fprintf(os.Stderr, "Server error: %s", err)
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os.Exit(1)
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}
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}
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