/*
HTTPHandlerFunc returns an http.HandlerFunc to use when hosting an AI.
*/
func HTTPHandlerFunc(lf common.LoggerFactory, ai AI) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
logger := lf(r)
defer func() {
if e := recover(); e != nil {
w.WriteHeader(500)
logger.Printf("Error delivering orders: %v", e)
}
}()
var req OrderRequest
common.MustDecodeJSON(r.Body, &req)
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
common.MustEncodeJSON(w, ai.Orders(lf(r), req.Me, req.State))
}
}
func nextTurn(cont appengine.Context, id *datastore.Key, playerNames []string) {
con := common.Context{Context: cont}
self := getGameById(con, id)
self.PlayerNames = playerNames
if self.Length > maxGameDuration {
self.State = StateFinished
self.Save(con)
con.Infof("Ended %v due to timeout", self.Id)
return
}
errorSavers := []func(){}
if err := common.Transaction(con, func(c common.Context) (err error) {
lastTurn := GetLatestTurnByParent(c, self.Id)
responses := make(chan orderResponse, len(self.Players))
for _, playerId := range self.Players {
orderResp := orderResponse{
DatastorePlayerId: playerId,
StatePlayerId: state.PlayerId(playerId.Encode()),
}
if foundAi := GetAIById(c, playerId); foundAi != nil {
go func() {
// Always deliver the order response
defer func() {
responses <- orderResp
}()
// create a request
orderRequest := ai.OrderRequest{
Me: orderResp.StatePlayerId,
State: lastTurn.State,
GameId: state.GameId(self.Id.Encode()),
}
// encode it into a body, and remember its string representation
sendBody := &bytes.Buffer{}
aiCommon.MustEncodeJSON(sendBody, orderRequest)
sendBodyString := sendBody.String()
// get a client
client := urlfetch.Client(c)
// send the request to the ai
req, err := http.NewRequest("POST", foundAi.URL, sendBody)
var resp *http.Response
if err == nil {
req.Header.Set("Content-Type", "application/json; charset=UTF-8")
resp, err = client.Do(req)
}
recvBody := &bytes.Buffer{}
recvBodyString := ""
if err == nil {
// check what we received
_, err = io.Copy(recvBody, resp.Body)
recvBodyString = recvBody.String()
}
// if we have no other errors, but we got a non-200
if err == nil && resp.StatusCode != 200 {
err = orderError{
Request: req,
RequestBody: sendBodyString,
Response: resp,
ResponseBody: recvBodyString,
}
}
// lets try to unserialize
if err == nil {
err = json.Unmarshal(recvBody.Bytes(), &orderResp.Orders)
}
// store the error, if any
if err != nil {
orderResp.Error = err
}
}()
} else {
responses <- orderResp
}
}
orderMap := map[state.PlayerId]state.Orders{}
for _, _ = range self.Players {
// wait for the responses
orderResp := <-responses
// store it
orderMap[orderResp.StatePlayerId] = orderResp.Orders
// if we got an error
if orderResp.Error != nil {
// make sure to save it later
errorSavers = append(errorSavers, func() {
if ai := GetAIById(con, orderResp.DatastorePlayerId); ai != nil {
ai.AddError(con, lastTurn.Id, orderResp.Error)
}
})
}
}
// execute the orders
newTurn, winner := lastTurn.Next(c, orderMap)
// save the new turn
newTurn.Save(c, self.Id)
// if we got a winner, end the game and store the winner
if winner == nil {
self.State = StatePlaying
} else {
self.Winner = common.MustDecodeKey(string(*winner))
self.State = StateFinished
}
// increase our length with the new turn
self.Length += 1
// save us
self.Save(c)
// if we didn't end, queue the next turn
if winner == nil {
nextTurnFunc.Call(c, self.Id, playerNames)
}
return nil
}); err != nil {
panic(err)
}
// run any error savers we got
for _, saver := range errorSavers {
saver()
}
// store the new stats in the players if we ended
if self.State == StateFinished {
for _, playerId := range self.Players {
common.Transaction(con, func(c common.Context) error {
if ai := GetAIById(c, playerId); ai != nil {
if playerId.Equal(self.Winner) {
ai.Wins += 1
} else {
ai.Losses += 1
}
ai.Save(c)
}
return nil
})
}
}
}
func (self Context) RenderJSON(i interface{}) {
self.SetContentType("application/json; charset=UTF-8", false)
common.MustEncodeJSON(self.Resp, i)
}