// InMemoryPlayerStore.go
package main
func NewInMemoryPlayerStore() *InMemoryPlayerStore {
return &InMemoryPlayerStore{map[string]int{}}
}
type InMemoryPlayerStore struct {
store map[string]int
}
func (i *InMemoryPlayerStore) GetLeague() []Player {
var league []Player
for name, wins := range i.store {
league = append(league, Player{name, wins})
}
return league
}
func (i *InMemoryPlayerStore) RecordWin(name string) {
i.store[name]++
}
func (i *InMemoryPlayerStore) GetPlayerScore(name string) int {
return i.store[name]
}
// main.go
package main
import (
"log"
"net/http"
)
func main() {
server := NewPlayerServer(NewInMemoryPlayerStore())
if err := http.ListenAndServe(":5000", server); err != nil {
log.Fatalf("could not listen on port 5000 %v", err)
}
}
# github.com/quii/learn-go-with-tests/json-and-io/v7
./FileSystemStore_test.go:15:28: too many values in struct initializer
./FileSystemStore_test.go:17:15: store.GetLeague undefined (type FileSystemStore has no field or method GetLeague)
func (f *FileSystemPlayerStore) GetPlayerScore(name string) int {
var wins int
for _, player := range f.GetLeague() {
if player.Name == name {
wins = player.Wins
break
}
}
return wins
}
type FileSystemPlayerStore struct {
database io.ReadWriteSeeker
}
./FileSystemStore_test.go:15:34: cannot use database (type *strings.Reader) as type io.ReadWriteSeeker in field value:
*strings.Reader does not implement io.ReadWriteSeeker (missing Write method)
./FileSystemStore_test.go:36:34: cannot use database (type *strings.Reader) as type io.ReadWriteSeeker in field value:
*strings.Reader does not implement io.ReadWriteSeeker (missing Write method)
func (f *FileSystemPlayerStore) RecordWin(name string) {
league := f.GetLeague()
for i, player := range league {
if player.Name == name {
league[i].Wins++
}
}
f.database.Seek(0,0)
json.NewEncoder(f.database).Encode(league)
}
type League []Player
func (l League) Find(name string) *Player {
for i, p := range l {
if p.Name==name {
return &l[i]
}
}
return nil
}
func (f *FileSystemPlayerStore) GetPlayerScore(name string) int {
player := f.GetLeague().Find(name)
if player != nil {
return player.Wins
}
return 0
}
func (f *FileSystemPlayerStore) RecordWin(name string) {
league := f.GetLeague()
player := league.Find(name)
if player != nil {
player.Wins++
}
f.database.Seek(0, 0)
json.NewEncoder(f.database).Encode(league)
}
type FileSystemPlayerStore struct {
database *json.Encoder
league League
}
func NewFileSystemPlayerStore(file *os.File) *FileSystemPlayerStore {
file.Seek(0, 0)
league, _ := NewLeague(file)
return &FileSystemPlayerStore{
database: json.NewEncoder(&tape{file}),
league: league,
}
}
type ReadWriteSeekTruncate interface {
io.ReadWriteSeeker
Truncate(size int64) error
}
func NewFileSystemPlayerStore(file *os.File) (*FileSystemPlayerStore, error) {
file.Seek(0, 0)
league, err := NewLeague(file)
if err != nil {
return nil, fmt.Errorf("problem loading player store from file %s, %v", file.Name(), err)
}
return &FileSystemPlayerStore{
database:&tape{file},
league:league,
}, nil
}
if err != nil {
return err
}
./main.go:18:35: multiple-value NewFileSystemPlayerStore() in single-value context
./FileSystemStore_test.go:35:36: multiple-value NewFileSystemPlayerStore() in single-value context
./FileSystemStore_test.go:57:36: multiple-value NewFileSystemPlayerStore() in single-value context
./FileSystemStore_test.go:70:36: multiple-value NewFileSystemPlayerStore() in single-value context
./FileSystemStore_test.go:85:36: multiple-value NewFileSystemPlayerStore() in single-value context
./server_integration_test.go:12:35: multiple-value NewFileSystemPlayerStore() in single-value context
store, err := NewFileSystemPlayerStore(db)
if err != nil {
log.Fatalf("problem creating file system player store, %v ", err)
}
func assertNoError(t *testing.T, err error) {
t.Helper()
if err != nil {
t.Fatalf("didnt expect an error but got one, %v", err)
}
}
=== RUN TestRecordingWinsAndRetrievingThem
--- FAIL: TestRecordingWinsAndRetrievingThem (0.00s)
server_integration_test.go:14: didnt expect an error but got one, problem loading player store from file /var/folders/nj/r_ccbj5d7flds0sf63yy4vb80000gn/T/db841037437, problem parsing league, EOF
=== RUN TestFileSystemStore/works_with_an_empty_file
--- FAIL: TestFileSystemStore/works_with_an_empty_file (0.00s)
FileSystemStore_test.go:108: didnt expect an error but got one, problem loading player store from file /var/folders/nj/r_ccbj5d7flds0sf63yy4vb80000gn/T/db019548018, problem parsing league, EOF
func NewFileSystemPlayerStore(file *os.File) (*FileSystemPlayerStore, error) {
file.Seek(0, 0)
info, err := file.Stat()
if err != nil {
return nil, fmt.Errorf("problem getting file info from file %s, %v", file.Name(), err)
}
if info.Size()==0 {
file.Write([]byte("[]"))
file.Seek(0, 0)
}
league, err := NewLeague(file)
if err != nil {
return nil, fmt.Errorf("problem loading player store from file %s, %v", file.Name(), err)
}
return &FileSystemPlayerStore{
database:&tape{file},
league:league,
}, nil
}
func initialisePlayerDBFile(file *os.File) error {
file.Seek(0, 0)
info, err := file.Stat()
if err != nil {
return fmt.Errorf("problem getting file info from file %s, %v", file.Name(), err)
}
if info.Size()==0 {
file.Write([]byte("[]"))
file.Seek(0, 0)
}
return nil
}
func NewFileSystemPlayerStore(file *os.File) (*FileSystemPlayerStore, error) {
err := initialisePlayerDBFile(file)
if err != nil {
return nil, fmt.Errorf("problem initialising player db file, %v", err)
}
league, err := NewLeague(file)
if err != nil {
return nil, fmt.Errorf("problem loading player store from file %s, %v", file.Name(), err)
}
return &FileSystemPlayerStore{
database:&tape{file},
league:league,
}, nil
}
