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stream.go
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stream.go
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package main
import (
"context"
"encoding/json"
"errors"
"fmt"
"log/slog"
"net/http"
"strconv"
"time"
jsonv2 "github.com/go-json-experiment/json"
"github.com/go-json-experiment/json/jsontext"
_ "github.com/mattn/go-sqlite3"
"github.com/y1w5/stream/go/internal/middleware"
)
// Stream is the main application. It stores and links all the components.
type Stream struct {
server *http.Server
db *DB
logger *slog.Logger
errChan chan error
}
// NewStreamParams stores required parameters for [NewStream].
type NewStreamParams struct {
Bind string
DB string
Logger *slog.Logger
}
// NewStream instanciates a [Stream].
func NewStream(arg NewStreamParams) (*Stream, error) {
db, err := NewDB(arg.DB)
if err != nil {
return nil, fmt.Errorf("new db: %v", err)
}
return &Stream{
db: db,
server: &http.Server{Addr: arg.Bind},
logger: arg.Logger,
errChan: make(chan error, 1),
}, nil
}
// ListenAndServe listens and serves HTTP requests.
func (s *Stream) ListenAndServe() error {
mux := http.NewServeMux()
mux.HandleFunc("/", notFoundHandler)
mux.HandleFunc("/v1/pages.list.std", s.listPagesStd)
mux.HandleFunc("/v1/pages.list.exp", s.listPagesExp)
mux.HandleFunc("/v2/pages.list", s.listPagesV2)
mux.HandleFunc("/v2/pages.stream", s.streamPagesV2)
mux.HandleFunc("/v3/pages.list", s.listPagesV3)
mux.HandleFunc("/v3/pages.stream", s.streamPagesV3)
s.server.Handler = middleware.Logger(s.logger, mux)
go func() {
s.logger.Info("listening on " + s.server.Addr)
err := s.server.ListenAndServe()
if err != nil && !errors.Is(err, http.ErrServerClosed) {
s.errChan <- fmt.Errorf("listen: %v", err)
return
}
s.errChan <- nil
}()
select {
case err := <-s.errChan:
return err
case <-time.After(time.Second):
return nil
}
}
// Close closes allocated ressources. It waits for 5 seconds for the running
// HTTP requests to finish before stopping.
func (s *Stream) Close() error {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
s.logger.Info("closing server & db")
var errs []error
if err := s.server.Shutdown(ctx); err != nil {
errs = append(errs, fmt.Errorf("server: %v", err))
}
if err := <-s.errChan; err != nil {
errs = append(errs, fmt.Errorf("server: %v", err))
}
if err := s.db.Close(); err != nil {
errs = append(errs, fmt.Errorf("db: %v", err))
}
if len(errs) > 0 {
return errs[0]
}
return nil
}
type response struct {
OK bool `json:"ok"`
Error string `json:"error,omitempty"`
Payload any `json:"payload,omitempty"`
}
func (s *Stream) listPagesStd(w http.ResponseWriter, r *http.Request) {
var pages []Page
w.Header().Set("Content-Type", "application/json")
limit, err := parseLimit(r)
if err != nil {
goto encode_err
}
pages, err = s.db.ListPages(r.Context(), limit)
if err != nil {
s.logger.Error("fail to execute handler", "err", err)
goto encode_err
}
w.WriteHeader(http.StatusOK)
_ = json.NewEncoder(w).Encode(pages)
return
encode_err:
w.WriteHeader(http.StatusInternalServerError)
_ = json.NewEncoder(w).Encode(response{Error: err.Error()})
}
func (s *Stream) listPagesExp(w http.ResponseWriter, r *http.Request) {
var pages []Page
w.Header().Set("Content-Type", "application/json")
limit, err := parseLimit(r)
if err != nil {
goto encode_err
}
pages, err = s.db.ListPages(r.Context(), limit)
if err != nil {
s.logger.Error("fail to execute handler", "err", err)
goto encode_err
}
w.WriteHeader(http.StatusOK)
_ = jsonv2.MarshalEncode(jsontext.NewEncoder(w), pages)
return
encode_err:
w.WriteHeader(http.StatusInternalServerError)
_ = json.NewEncoder(w).Encode(response{Error: err.Error()})
}
func notFoundHandler(w http.ResponseWriter, r *http.Request) {
status := http.StatusNotFound
http.Error(w, http.StatusText(status), status)
}
func parseLimit(r *http.Request) (int, error) {
tmp := r.URL.Query().Get("limit")
if tmp == "" {
return 0, nil
}
limit, err := strconv.Atoi(tmp)
if err != nil {
return 0, nil
}
return limit, nil
}