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Chain-related

IsOriginCall​

func IsOriginCall() bool

Checks if the caller of the function is an EOA. Returns true if caller is an EOA, false otherwise.

Usage​

if !std.IsOriginCall() {...}

AssertOriginCall​

func AssertOriginCall()

Panics if caller of function is not an EOA.

Usage​

std.AssertOriginCall()

Emit​

func Emit(typ string, attrs ...string)

Emits a Gno event. Takes in a string type (event identifier), and an even number of string arguments acting as key-value pairs to be included in the emitted event.

Usage​

std.Emit("MyEvent", "myKey1", "myValue1", "myKey2", "myValue2")

GetChainID​

func GetChainID() string

Returns the chain ID.

Usage​

chainID := std.GetChainID() // dev | test3 | main ...

GetHeight​

func GetHeight() int64

Returns the current block number (height).

Usage​

height := std.GetHeight()

GetOrigSend​

func GetOrigSend() Coins

Returns the Coins that were sent along with the calling transaction.

Usage​

coinsSent := std.GetOrigSend()

GetOrigCaller​

func GetOrigCaller() Address

Returns the original signer of the transaction.

Usage​

caller := std.GetOrigCaller()

GetOrigPkgAddr​

func GetOrigPkgAddr() string

Returns the address of the first (entry point) realm/package in a sequence of realm/package calls.

Usage​

origPkgAddr := std.GetOrigPkgAddr()

CurrentRealm​

func CurrentRealm() Realm

Returns current Realm object.

Usage​

currentRealm := std.CurrentRealm()

PrevRealm​

func PrevRealm() Realm

Returns the previous caller realm (can be code or user realm). If caller is a user realm, pkgpath will be empty.

Usage​

prevRealm := std.PrevRealm()

GetCallerAt​

func GetCallerAt(n int) Address

Returns the n-th caller of the function, going back in the call trace.

Usage​

currentRealm := std.GetCallerAt(1)      // returns address of current realm
previousRealm := std.GetCallerAt(2)     // returns address of previous realm/caller
std.GetCallerAt(0)                      // error, n must be > 0

DerivePkgAddr​

func DerivePkgAddr(pkgPath string) Address

Derives the Realm address from its pkgpath parameter.

Usage​

realmAddr := std.DerivePkgAddr("gno.land/r/demo/tamagotchi") //  g1a3tu874agjlkrpzt9x90xv3uzncapcn959yte4