beexar

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README

beexar-go

Beexar operator SDK for Go. Launch game sessions, and serve the four seamless-wallet callbacks the platform calls during play.

Zero dependencies — standard library only, in the SDK and in its tests. Go 1.26+.

go get github.com/beexar-games/beexar-go

Full docs: https://docs.beexar.com · OpenAPI: https://docs.beexar.com/api-reference/

The integration in one picture

There are two halves, and the second one is the work.

you  ──  POST /api/v1/softswiss/launcher/real  ──▶  Beexar     (Client)
                                                      │
player plays                                          │
                                                      ▼
your wallet  ◀──  POST /balance /betwin /rollback /finish  ──  Beexar   (WalletServer)

Half 1 — launching a game

client, err := beexar.NewClient(os.Getenv("BEEXAR_CASINO_ID"), os.Getenv("BEEXAR_API_SECRET"))
if err != nil {
    return err
}

res, err := client.LaunchReal(ctx, beexar.LaunchRealRequest{
    Game:    "dice",
    Account: beexar.LaunchAccount{ID: "player_123", Currency: "EUR"},
    Locale:  "en",
})
// res.LaunchURL goes in an iframe

LaunchDemo does the same on a virtual balance and makes no wallet calls. ListGames returns the catalogue enabled for you.

Half 2 — serving the wallet

Implement four methods against your ledger. Everything else — signature verification, parsing, validation, the error envelope — is handled.

type Wallet struct{ db *sql.DB }

func (w *Wallet) BetWin(ctx context.Context, req beexar.BetWinRequest, _ beexar.RequestContext) (beexar.BetWinResult, error) {
    // Everything below must be in ONE database transaction. See "The boundary".
    var results []beexar.BetWinTransactionResult
    for _, t := range req.Transactions {
        if seen, ok := w.lookup(ctx, t.IDProvider); ok {
            results = append(results, beexar.BetWinTransactionResult{IDProvider: t.IDProvider, ID: seen.ID})
            continue
        }
        if w.isRolledBack(ctx, t.IDProvider) {
            return beexar.BetWinResult{}, beexar.ErrAlreadyRolledBack()
        }
        if t.Type == beexar.TransactionBet && w.balance(ctx).Cmp(t.Amount) < 0 {
            return beexar.BetWinResult{}, beexar.ErrInsufficientFunds(w.balance(ctx))
        }
        id := w.apply(ctx, t)
        results = append(results, beexar.BetWinTransactionResult{IDProvider: t.IDProvider, ID: id})
    }
    return beexar.BetWinResult{RoundID: w.roundID(req.RoundID), Balance: w.balance(ctx), Transactions: results}, nil
}

// … Balance, Rollback, Finish

server, _ := beexar.NewWalletServer(&Wallet{db}, os.Getenv("BEEXAR_API_SECRET"))
mux.Handle("/wallet/", server.NewHandler())

Then point the four callback URLs in the backoffice at https://your-host/wallet/{balance,betwin,rollback,finish} and run the Integration Test Game — 29 scenarios against your implementation.

A complete, correct wallet you can read in one sitting: examples/inmemory. A runnable server: examples/server.

The raw body

The signature is an HMAC over the exact bytes of the request. NewHandler reads them once and hands the same slice to Dispatch. If you wire the callbacks yourself, read the body before anything decodes it, and pass those bytes:

body, _ := io.ReadAll(io.LimitReader(r.Body, beexar.MaxBodyBytes+1))
out := server.Dispatch(r.Context(), beexar.RouteBetWin, body, r.Header.Get(beexar.SignatureHeader), nil)

Decoding and re-encoding the JSON changes key order, escaping and number rendering — the bytes that were signed are then gone for good. When a signature fails and the SDK can tell why, beexar.WithWarning gives you the reason in plain words.

Money

Amounts and balances are decimal strings in the currency's main unit — "0.90" is ninety cents. beexar.Money has no float constructor and marshals to a JSON string, so an amount can never become a float64 on the way past.

beexar.MustParseMoney("100.00").Sub(beexar.MustParseMoney("0.30")).String() // "99.70"
beexar.MoneyFromMinorUnits(big.NewInt(9970), 2)                             // "99.70" from an integer ledger

"1E2000000000" and anything past 16 decimals is rejected on shape, before any arithmetic touches it.

Errors

Two HTTP statuses exist on this contract, 400 and 500, and the meaning lives in meta.api_code. Return a *WalletError and the envelope is built for you:

return beexar.ErrInsufficientFunds(currentBalance) // 400 / api_code 100
return beexar.ErrAlreadyRolledBack()               // 400 / api_code 409
return beexar.ErrInvalidPlayer("")                 // 400 / api_code 101

Codes 100, 105 and 106 must carry the player's balance, so those constructors take it as a required parameter — there is no way to build one without it. Any other error becomes an opaque 500 and its message never leaves your process.

The boundary

The SDK does not do idempotency or tombstones for you, and it will not pretend to. Both have to happen in the same database transaction as the balance update, and no library can join your transaction. What you must do:

  1. Store every id_provider with a unique index, and check it inside the transaction that moves the money.
  2. Store the response you returned — a repeat must return the id and balance you gave the first time, not today's.
  3. On rollback, record a tombstone for OriginalIDProvider whether or not the original exists. Out-of-order delivery is normal; a later /betwin for a tombstoned id must be refused with ErrAlreadyRolledBack().

Your handler has 15 seconds. The platform retries 5xx and timeouts for up to 30 seconds with the same id_provider; it does not retry insufficient funds, bet limits, bad requests or signature failures.

Types come from the spec

The types in this package track the published OpenAPI documents (openapi/ in this repo). contract_test.go reads a normalised description of those specs and fails if a field the contract declares is missing here — a change to the contract breaks the build rather than reaching you as a dropped value.

License

MIT

Documentation

Index

Constants

View Source 
const (
	APICodeInsufficientFunds  = "100"
	APICodeInvalidPlayer      = "101"
	APICodeBetLimitReached    = "105"
	APICodeMaxBetExceeded     = "106"
	APICodeGameForbidden      = "107"
	APICodePlayerDisabled     = "110"
	APICodeCountryRestricted  = "153"
	APICodeCurrencyNotAllowed = "154"
	APICodeFieldImmutable     = "155"

	APICodeBadRequest = "400"
	APICodeForbidden  = "403"
	APICodeNotFound   = "404"
	// APICodeAlreadyRolledBack is a Beexar extension. Return it from /betwin to
	// reject a transaction whose id_provider was already rolled back —
	// including a rollback that arrived BEFORE the bet it reverses.
	APICodeAlreadyRolledBack = "409"

	APICodeGameNotAvailable = "405"
	APICodeCasinoDisabled   = "410"

	APICodeUnknownError       = "500"
	APICodeServiceUnavailable = "503"
	APICodeRequestTimeout     = "504"
)

SoftSwiss API codes, ported verbatim from the platform's own registry.

Two things about this contract surprise everyone once:

  1. There are only two HTTP statuses (400 and 500) and two Twirp codes ("invalid_argument" and "internal"). All meaning lives in meta.api_code. Branch on that, never on the status.
  2. A signature failure is HTTP 400 with api_code "403", not HTTP 403. Answering 403 breaks the contract.
View Source 
const (
	TwirpCodeInvalidArgument = "invalid_argument"
	TwirpCodeInternal        = "internal"
)

Twirp codes. Only these two exist on this contract.

View Source 
const (
	// MaxScale bounds fractional digits, mirroring the platform's
	// NUMERIC(38,16) storage.
	MaxScale = 16
	// MaxClientDecimalLen mirrors the `maxLength: 40` the OpenAPI contract puts
	// on amount fields.
	MaxClientDecimalLen = 40
)
View Source 
const CurrencyPattern = `^[A-Z][A-Z0-9_]{2,31}$`

CurrencyPattern is the regular expression currencies must match.

View Source 
const MaxBodyBytes = 64 * 1024

MaxBodyBytes mirrors the gateway's own cap on an operator request body, so a body it would never have sent cannot make your process allocate.

View Source 
const ProductionBaseURL = "https://gateway.beexar.com"

ProductionBaseURL is the Beexar gateway.

View Source 
const SignatureHeader = "X-REQUEST-SIGN"

SignatureHeader is the header carrying the request signature: hex-encoded HMAC-SHA256 of the RAW request body, keyed with the operator's API secret. 64 lowercase hex characters.

View Source 
const Version = "1.1.0"

Version is stamped at release time from sdk/VERSION. The same number is published for the Node, PHP, Go and Python SDKs and always means the same contract snapshot.

Variables

View Source 
var ErrMalformedAmount = errors.New("beexar: not a valid decimal amount")

ErrMalformedAmount is returned for a string outside the contract's amount shape.

View Source 
var Routes = []Route{RouteBalance, RouteBetWin, RouteRollback, RouteFinish}

Routes lists every callback route.

View Source 
var ZeroMoney = Money{/* contains filtered or unexported fields */}

ZeroMoney is zero at scale 2 — the scale the contract's examples use.

Functions

func IsFundsRelatedCode 

func IsFundsRelatedCode(code string) bool

IsFundsRelatedCode reports whether an api_code must carry the player's balance in meta.balance.

The platform will not complain if you omit it — it reads the field with the error swallowed — so the player simply sees a wrong balance. That is exactly why this SDK refuses to build such an error without one.

func Sign 

func Sign(body []byte, secret string) string

Sign returns the signature for the exact bytes you are about to put on the wire.

func ValidCurrency 

func ValidCurrency(code string) bool

ValidCurrency reports whether code matches the contract's currency pattern: ISO-4217 fiat, a crypto ticker, or an operator's CUSTOM_ code.

Lowercase is REJECTED, never normalised — the platform's schema does the same, and quietly upcasing here would hide an operator bug until settlement.

func Verify 

func Verify(body []byte, signature, secret string) bool

Verify checks a signature in constant time.

body must be the bytes as received. If anything between the socket and this call parsed the JSON and serialised it again, those bytes are gone and no amount of care here can recover them.

Types

type APIError 

type APIError struct {
	HTTPStatus int
	Code       string
	APICode    string
	APIMessage string
}

APIError is an error answer from the Beexar gateway to one of YOUR calls (LaunchReal, LaunchDemo, ListGames).

func (*APIError) Error 

func (e *APIError) Error() string

Error implements error.

func (*APIError) Retryable 

func (e *APIError) Retryable() bool

Retryable reports whether the call is worth repeating. A 400 on this contract is terminal — retrying it changes nothing.

func (*APIError) SignatureError 

func (e *APIError) SignatureError() bool

SignatureError reports whether the gateway rejected the request signature. Keyed on api_code, because the status alone is ambiguous.

type BalanceRequest 

type BalanceRequest struct {
	AccountID string `json:"account_id"`
	Currency  string `json:"currency"`
	GameID    string `json:"game_id"`
	SessionID string `json:"session_id,omitempty"`
}

BalanceRequest asks for a player's current balance.

type BalanceResult 

type BalanceResult struct {
	Balance Money
}

BalanceResult answers a BalanceRequest.

type BetWinRequest 

type BetWinRequest struct {
	AccountID string
	Currency  string
	GameID    string
	RoundID   string
	Finished  bool
	// Transactions arrive in request order. Apply them in this order, atomically.
	Transactions []BetWinTransaction
	SessionID    string
}

BetWinRequest debits and/or credits a player.

type BetWinResult 

type BetWinResult struct {
	// RoundID is YOUR round id.
	RoundID string
	// Balance after all transactions in this request.
	Balance Money
	// Transactions holds one entry per request transaction, in the same order.
	Transactions []BetWinTransactionResult
}

BetWinResult answers a BetWinRequest.

type BetWinTransaction 

type BetWinTransaction struct {
	IDProvider string
	Type       TransactionType
	// Amount is always greater than zero — the SDK rejects 0 before your code
	// runs.
	Amount Money
}

BetWinTransaction is one money movement inside a /betwin request.

type BetWinTransactionResult 

type BetWinTransactionResult struct {
	// IDProvider echoes the platform's id back unchanged.
	IDProvider string
	// ID is YOUR transaction id. On a replay, return the one you stored the
	// first time.
	ID string
	// BonusAmount is the bonus balance moved by this transaction. The contract
	// requires the field; the SDK emits "0.00" when you leave it nil.
	BonusAmount *Money
}

BetWinTransactionResult is your answer for one transaction.

type Client 

type Client struct {
	// contains filtered or unexported fields
}

Client makes the calls you send to Beexar: launch a session, list the catalogue.

Every POST is signed with hex(HMAC-SHA256(body, apiSecret)) over the exact bytes that go on the wire — the body is marshalled once, signed, and sent. Marshalling twice is how signatures mysteriously stop matching.

func NewClient 

func NewClient(casinoID, apiSecret string, opts ...ClientOption) (*Client, error)

NewClient builds a client. casinoID is your operator slug; apiSecret comes from the backoffice and must never reach a browser.

func (*Client) LaunchDemo 

func (c *Client) LaunchDemo(ctx context.Context, req LaunchDemoRequest) (LaunchResult, error)

LaunchDemo starts a demo session on a virtual balance. No wallet callbacks are made during demo play.

func (*Client) LaunchReal 

func (c *Client) LaunchReal(ctx context.Context, req LaunchRealRequest) (LaunchResult, error)

LaunchReal starts a real-money session and returns the URL to embed.

func (*Client) ListGames 

func (c *Client) ListGames(ctx context.Context, q ListGamesQuery) ([]GameInfo, error)

ListGames returns the catalogue enabled for the operator. This endpoint is public and carries no signature.

type ClientOption 

type ClientOption func(*Client)

ClientOption configures a Client.

func WithBaseURL 

func WithBaseURL(u string) ClientOption

WithBaseURL points the client at a different gateway (staging, or a local stack).

func WithHTTPClient 

func WithHTTPClient(h *http.Client) ClientOption

WithHTTPClient supplies the HTTP client to use, for timeouts, proxies or tests.

type DispatchResponse 

type DispatchResponse struct {
	Status int
	Body   []byte
}

DispatchResponse is what the transport should write back.

type ErrorEnvelope 

type ErrorEnvelope struct {
	Code string    `json:"code"`
	Msg  string    `json:"msg"`
	Meta ErrorMeta `json:"meta"`
}

ErrorEnvelope is the error body both sides of this contract exchange.

type ErrorMeta 

type ErrorMeta struct {
	APICode    string `json:"api_code"`
	APIMessage string `json:"api_message"`
	Balance    string `json:"balance,omitempty"`
}

ErrorMeta is the meta object of the Twirp error envelope.

type FinishRequest 

type FinishRequest struct {
	AccountID string
	Currency  string
	RoundID   string
	SessionID string
}

FinishRequest closes a round. It carries no game_id.

type FinishResult 

type FinishResult struct {
	Balance Money
}

FinishResult answers a FinishRequest.

type GameImage added in v1.1.0 

type GameImage struct {
	Type    string `json:"type,omitempty"`
	Width   int    `json:"width,omitempty"`
	Height  int    `json:"height,omitempty"`
	URL     string `json:"url,omitempty"`
	WebPURL string `json:"webp_url,omitempty"`
}

GameImage is one catalog image of a game: a PNG, with a WebP copy when available.

type GameInfo 

type GameInfo struct {
	Title            string   `json:"title,omitempty"`
	Identifier       string   `json:"identifier,omitempty"`
	Category         string   `json:"category,omitempty"`
	FeatureGroup     string   `json:"feature_group,omitempty"`
	Payout           float64  `json:"payout,omitempty"`
	VolatilityRating string   `json:"volatility_rating,omitempty"`
	HasFreespins     bool     `json:"has_freespins,omitempty"`
	BonusBuy         bool     `json:"bonus_buy,omitempty"`
	DemoAvailable    bool     `json:"demo_available,omitempty"`
	Thumbnail        string   `json:"thumbnail,omitempty"`
	Currencies       []string `json:"currencies,omitempty"`
	// Restrictions carries the country blacklist that applies to this game.
	Restrictions *GameRestrictions `json:"restrictions,omitempty"`
	// Images are every catalog image the game has, one per format, the
	// square tile first: square_640 (640×640), portrait_3x4 (600×800),
	// landscape_16x9 (1280×720), social_1200x630 (1200×630 link-preview
	// card). Empty when the game has none — Thumbnail then carries the
	// platform default.
	Images []GameImage `json:"images,omitempty"`
}

GameInfo describes one game in the operator catalogue.

type GameRestrictionRule 

type GameRestrictionRule struct {
	// Blacklist holds ISO country codes the game must not be offered in.
	Blacklist []string `json:"blacklist,omitempty"`
}

GameRestrictionRule is one set of country restrictions.

type GameRestrictions 

type GameRestrictions struct {
	Default *GameRestrictionRule `json:"default,omitempty"`
}

GameRestrictions groups the per-game availability rules.

type LaunchAccount 

type LaunchAccount struct {
	ID           string   `json:"id"`
	Currency     string   `json:"currency"`
	Firstname    string   `json:"firstname,omitempty"`
	Lastname     string   `json:"lastname,omitempty"`
	Nickname     string   `json:"nickname,omitempty"`
	Email        string   `json:"email,omitempty"`
	Country      string   `json:"country,omitempty"`
	DateOfBirth  string   `json:"date_of_birth,omitempty"`
	RegisteredAt string   `json:"registered_at,omitempty"`
	Tags         []string `json:"tags,omitempty"`
}

LaunchAccount identifies the player a real-money session is launched for.

type LaunchDemoRequest 

type LaunchDemoRequest struct {
	Game         string      `json:"game"`
	Currency     string      `json:"currency,omitempty"`
	Balance      string      `json:"balance,omitempty"`
	PlayerID     string      `json:"player_id,omitempty"`
	Locale       string      `json:"locale,omitempty"`
	IP           string      `json:"ip,omitempty"`
	ClientType   string      `json:"client_type,omitempty"`
	URLs         *LaunchURLs `json:"urls,omitempty"`
	Jurisdiction string      `json:"jurisdiction,omitempty"`
}

LaunchDemoRequest launches a demo session on a virtual balance.

type LaunchRealRequest 

type LaunchRealRequest struct {
	Game           string        `json:"game"`
	Account        LaunchAccount `json:"account"`
	Locale         string        `json:"locale,omitempty"`
	IP             string        `json:"ip,omitempty"`
	ClientType     string        `json:"client_type,omitempty"`
	URLs           *LaunchURLs   `json:"urls,omitempty"`
	Jurisdiction   string        `json:"jurisdiction,omitempty"`
	SessionID      string        `json:"session_id,omitempty"`
	SessionPayload string        `json:"session_payload,omitempty"`
}

LaunchRealRequest launches a real-money session.

type LaunchResult 

type LaunchResult struct {
	LaunchURL string `json:"launch_url"`
}

LaunchResult carries the URL to embed.

type LaunchURLs 

type LaunchURLs struct {
	ReturnURL  string `json:"return_url,omitempty"`
	DepositURL string `json:"deposit_url,omitempty"`
}

LaunchURLs are the pages the game links back to.

type ListGamesQuery 

type ListGamesQuery struct {
	// Operator defaults to the client's CasinoID.
	Operator string
	// Active, when set, filters by whether the game is enabled.
	Active *bool
}

ListGamesQuery filters the catalogue.

type Money 

type Money struct {
	// contains filtered or unexported fields
}

Money is a decimal amount in a currency's main unit — "0.90" is ninety cents.

There is no constructor taking a float. IEEE-754 cannot hold 0.1, and a wallet that rounds a player's balance by a hundredth of a cent per round is a reconciliation incident rather than a rounding detail.

The zero value is a valid zero amount at scale 0.

func MoneyFromMinorUnits 

func MoneyFromMinorUnits(units *big.Int, scale int) (Money, error)

MoneyFromMinorUnits builds an amount from an integer number of minor units — the bridge for a ledger that stores cents. MoneyFromMinorUnits(12345, 2) is "123.45".

func MustParseMoney 

func MustParseMoney(s string) Money

MustParseMoney is ParseMoney for constants and tests. It panics on a bad value, so never give it anything that came off the wire.

func ParseMoney 

func ParseMoney(s string) (Money, error)

ParseMoney reads a decimal string from the wire.

func (Money) Add 

func (m Money) Add(other Money) Money

Add returns m + other.

func (Money) ClampToZero 

func (m Money) ClampToZero() Money

ClampToZero returns m, or zero when m is negative.

func (Money) Cmp 

func (m Money) Cmp(other Money) int

Cmp returns -1, 0 or 1.

func (Money) Equal 

func (m Money) Equal(other Money) bool

Equal compares by value, so "1.5" and "1.50" are equal.

func (Money) Format 

func (m Money) Format(scale int) string

Format renders with exactly scale fractional digits, truncating toward zero.

func (Money) FormatBonus 

func (m Money) FormatBonus() string

FormatBonus renders bonus_amount, which the contract caps at 12 fractional digits while platform money allows 16. Clamping here keeps a 16-decimal currency from emitting a value the contract would reject.

func (Money) IsNegative 

func (m Money) IsNegative() bool

IsNegative reports whether the amount is below zero.

func (Money) IsPositive 

func (m Money) IsPositive() bool

IsPositive reports whether the amount is above zero.

func (Money) IsZero 

func (m Money) IsZero() bool

IsZero reports whether the amount is exactly zero.

func (Money) MarshalJSON 

func (m Money) MarshalJSON() ([]byte, error)

MarshalJSON emits the wire form, so an amount can never be serialised as a JSON number.

func (Money) MinorUnits 

func (m Money) MinorUnits() *big.Int

MinorUnits returns the unscaled integer value at Scale.

func (Money) Scale 

func (m Money) Scale() int

Scale is the number of fractional digits the amount is expressed in.

func (Money) String 

func (m Money) String() string

String renders at the amount's own scale — the canonical wire form.

func (Money) Sub 

func (m Money) Sub(other Money) Money

Sub returns m - other. The result may be negative, which is how an insufficient balance is detected.

func (*Money) UnmarshalJSON 

func (m *Money) UnmarshalJSON(b []byte) error

UnmarshalJSON accepts only the contract's decimal-string shape.

type RequestContext 

type RequestContext struct {
	Route Route
	// RawBody holds the exact bytes the signature was verified against.
	RawBody []byte
	// Headers has lower-cased keys.
	Headers map[string]string
}

RequestContext carries everything about the request that is not part of the parsed body.

type RollbackRequest 

type RollbackRequest struct {
	AccountID string
	Currency  string
	// GameID is required by the contract and always sent by the platform, but
	// the SDK accepts its absence and gives you "" rather than rejecting a
	// request it could have served. Liberal in, strict out.
	GameID string
	// RoundIDProvider — note the name: rollback uses round_id_provider while
	// betwin and finish use round_id.
	RoundIDProvider string
	Finished        bool
	Transactions    []RollbackTransaction
	SessionID       string
}

RollbackRequest reverses transactions in a round.

type RollbackResult 

type RollbackResult struct {
	Balance      Money
	RoundID      string
	Transactions []RollbackTransactionResult
}

RollbackResult answers a RollbackRequest.

type RollbackTransaction 

type RollbackTransaction struct {
	IDProvider string
	// OriginalIDProvider is the id_provider of the transaction being reversed.
	OriginalIDProvider string
}

RollbackTransaction reverses one earlier transaction.

type RollbackTransactionResult 

type RollbackTransactionResult struct {
	IDProvider string
	// ID is your transaction id, or "" when there was nothing to reverse.
	ID string
}

RollbackTransactionResult is your answer for one rollback transaction.

type Route 

type Route string

Route is one of the four callback paths, exactly as the contract names them. 

const (
	RouteBalance  Route = "/balance"
	RouteBetWin   Route = "/betwin"
	RouteRollback Route = "/rollback"
	RouteFinish   Route = "/finish"
)

The four callback routes.

func RouteFromPath 

func RouteFromPath(path string) (Route, bool)

RouteFromPath maps a request path to one of the four callback routes, matching on the suffix so any mount prefix works.

type TransactionType 

type TransactionType string

TransactionType is "bet" or "win". 

const (
	TransactionBet TransactionType = "bet"
	TransactionWin TransactionType = "win"
)

The two transaction types /betwin carries.

type WalletError 

type WalletError struct {
	Status    int
	TwirpCode string
	APICode   string
	Message   string
	// Balance is required for api_code 100, 105 and 106 and must be nil
	// otherwise.
	Balance *Money
}

WalletError is the error your handler returns to answer the platform with a specific api_code. Anything else you return becomes an opaque 500 — your message is never echoed to the platform.

func ErrAlreadyRolledBack 

func ErrAlreadyRolledBack() *WalletError

ErrAlreadyRolledBack builds api_code 409 — the transaction's id_provider was already rolled back (tombstoned).

func ErrBadRequest 

func ErrBadRequest(message string) *WalletError

ErrBadRequest builds api_code 400.

func ErrBetLimitReached 

func ErrBetLimitReached(balance Money) *WalletError

ErrBetLimitReached builds api_code 105.

func ErrCurrencyNotAllowed 

func ErrCurrencyNotAllowed(message string) *WalletError

ErrCurrencyNotAllowed builds api_code 154.

func ErrGameForbidden 

func ErrGameForbidden(message string) *WalletError

ErrGameForbidden builds api_code 107.

func ErrInsufficientFunds 

func ErrInsufficientFunds(balance Money) *WalletError

ErrInsufficientFunds builds api_code 100.

func ErrInternal 

func ErrInternal(message string) *WalletError

ErrInternal builds api_code 500.

func ErrInvalidPlayer 

func ErrInvalidPlayer(message string) *WalletError

ErrInvalidPlayer builds api_code 101.

func ErrInvalidSignature 

func ErrInvalidSignature() *WalletError

ErrInvalidSignature builds api_code 403 — with HTTP 400, as the contract requires.

func ErrMaxBetExceeded 

func ErrMaxBetExceeded(balance Money) *WalletError

ErrMaxBetExceeded builds api_code 106.

func ErrNotFound 

func ErrNotFound(message string) *WalletError

ErrNotFound builds api_code 404.

func ErrPlayerDisabled 

func ErrPlayerDisabled(message string) *WalletError

ErrPlayerDisabled builds api_code 110.

func ErrServiceUnavailable 

func ErrServiceUnavailable(message string) *WalletError

ErrServiceUnavailable builds api_code 503.

func WalletErrorWithAPICode 

func WalletErrorWithAPICode(apiCode, message string, balance *Money) (*WalletError, error)

WalletErrorWithAPICode is the escape hatch for an api_code without a dedicated constructor. It enforces the same balance rule, so it cannot be used to bypass it.

func (*WalletError) Envelope 

func (e *WalletError) Envelope() ErrorEnvelope

Envelope renders the wire form. It panics if a funds-related code lost its balance on the way, which can only happen through WalletErrorWithAPICode.

func (*WalletError) Error 

func (e *WalletError) Error() string

Error implements error.

type WalletHandler 

type WalletHandler interface {
	Balance(ctx context.Context, req BalanceRequest, rc RequestContext) (BalanceResult, error)
	BetWin(ctx context.Context, req BetWinRequest, rc RequestContext) (BetWinResult, error)
	Rollback(ctx context.Context, req RollbackRequest, rc RequestContext) (RollbackResult, error)
	Finish(ctx context.Context, req FinishRequest, rc RequestContext) (FinishResult, error)
}

WalletHandler is the four methods you implement against your own ledger. Everything else — signature verification, parsing, validation, the Twirp error envelope — is the SDK's job.

Return a *WalletError to answer with a specific api_code. Any other error becomes an opaque 500 and its message never leaves your process.

type WalletServer 

type WalletServer struct {
	// contains filtered or unexported fields
}

WalletServer turns the four callbacks into one pure function.

Dispatch takes bytes and a signature and returns a status and a body. No framework type crosses that boundary and it never sees a parsed body from the outside, so signing the wrong thing is not expressible.

func NewWalletServer 

func NewWalletServer(handler WalletHandler, apiSecret string, opts ...WalletServerOption) (*WalletServer, error)

NewWalletServer builds a server. It fails on an empty secret: the gateway treats an empty secret as an automatic verification failure, so a server built with one would authenticate nothing while looking healthy.

func (*WalletServer) Dispatch 

func (s *WalletServer) Dispatch(ctx context.Context, route Route, rawBody []byte, signature string, headers map[string]string) DispatchResponse

Dispatch verifies, parses, validates and routes one callback.

func (*WalletServer) NewHandler 

func (s *WalletServer) NewHandler() http.Handler

NewHandler wires the four callbacks into an http.Handler.

It matches on the path SUFFIX because the mount path belongs to you: the gateway POSTs to the full callback URL configured in the backoffice, prefix and all, so /api/v2/psp/betwin is as valid as /betwin.

type WalletServerOption 

type WalletServerOption func(*WalletServer)

WalletServerOption configures a WalletServer.

func WithMaxBodyBytes 

func WithMaxBodyBytes(n int) WalletServerOption

WithMaxBodyBytes overrides the request body cap.

func WithWarning 

func WithWarning(fn func(message string)) WalletServerOption

WithWarning sets the sink for diagnostics explaining WHY a signature failed. The default writes nothing; pass a logger to see them.

Source Files

View all Source files

Directories

Path Synopsis
examples
inmemory
Package inmemory is a complete, correct Beexar wallet held in memory.
 Package inmemory is a complete, correct Beexar wallet held in memory.
server command
A complete Beexar wallet integration in one file.
 A complete Beexar wallet integration in one file.

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