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Object Value and Type Persistence. Node persistence is simulated with the preprocessing of all files upon app restart.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| package bank | ||
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|
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| // NOTE: unexposed struct for security. | ||
| type order struct { | ||
| from Address | ||
| to Address | ||
| amount Coins | ||
| processed bool | ||
| } | ||
|
|
||
| // NOTE: unexposed methods for security. | ||
| func (ch *order) string() string { | ||
| return "TODO" | ||
| } | ||
|
|
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| // Wraps the internal *order for external use. | ||
| type Order struct { | ||
| *order | ||
| } | ||
|
|
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| // XXX only exposed for demonstration. TODO unexpose, make full demo. | ||
| func NewOrder(from Address, to Address, amount Coins) Order { | ||
| return Order{ | ||
| order: &order{ | ||
| from: from, | ||
| to: to, | ||
| amount: amount, | ||
| }, | ||
| } | ||
| } | ||
|
|
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| // Panics if error, or already processed. | ||
| func (o Order) Execute() { | ||
| if o.order.processed { | ||
| panic("order already processed") | ||
| } | ||
| o.order.processed = true | ||
| // TODO implemement. | ||
| } | ||
|
|
||
| func (o Order) IsZero() bool { | ||
| return o.order == nil | ||
| } | ||
|
|
||
| func (o Order) From() Address { | ||
| return o.order.from | ||
| } | ||
|
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||
| func (o Order) To() Address { | ||
| return o.order.to | ||
| } | ||
|
|
||
| func (o Order) Amount() Coins { | ||
| return o.order.amount | ||
| } | ||
|
|
||
| func (o Order) Processed() bool { | ||
| return o.order.processed | ||
| } | ||
|
|
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| //---------------------------------------- | ||
| // Escrow | ||
|
|
||
| type EscrowTerms struct { | ||
| PartyA Address | ||
| PartyB Address | ||
| AmountA Coins | ||
| AmountB Coins | ||
| } | ||
|
|
||
| type EscrowContract struct { | ||
| EscrowTerms | ||
| OrderA Order | ||
| OrderB Order | ||
| } | ||
|
|
||
| func CreateEscrow(terms EscrowTerms) *EscrowContract { | ||
| return &EscrowContract{ | ||
| EscrowTerms: terms, | ||
| } | ||
| } | ||
|
|
||
| func (esc *EscrowContract) SetOrderA(order Order) { | ||
| if !esc.OrderA.IsZero() { | ||
| panic("order-a already set") | ||
| } | ||
| if esc.EscrowTerms.PartyA != order.From() { | ||
| panic("invalid order-a:from mismatch") | ||
| } | ||
| if esc.EscrowTerms.PartyB != order.To() { | ||
| panic("invalid order-a:to mismatch") | ||
| } | ||
| if esc.EscrowTerms.AmountA != order.Amount() { | ||
| panic("invalid order-a amount") | ||
| } | ||
| esc.OrderA = order | ||
| } | ||
|
|
||
| func (esc *EscrowContract) SetOrderB(order Order) { | ||
| if !esc.OrderB.IsZero() { | ||
| panic("order-b already set") | ||
| } | ||
| if esc.EscrowTerms.PartyB != order.From() { | ||
| panic("invalid order-b:from mismatch") | ||
| } | ||
| if esc.EscrowTerms.PartyA != order.To() { | ||
| panic("invalid order-b:to mismatch") | ||
| } | ||
| if esc.EscrowTerms.AmountB != order.Amount() { | ||
| panic("invalid order-b amount") | ||
| } | ||
| esc.OrderA = order | ||
| } | ||
|
|
||
| func (esc *EscrowContract) Execute() { | ||
| if esc.OrderA.IsZero() { | ||
| panic("order-a not yet set") | ||
| } | ||
| if esc.OrderB.IsZero() { | ||
| panic("order-b not yet set") | ||
| } | ||
| // NOTE: succeeds atomically. | ||
| esc.OrderA.Execute() | ||
| esc.OrderB.Execute() | ||
| } | ||
|
|
||
| //---------------------------------------- | ||
| // TODO: actually implement these in std package. | ||
|
|
||
| type Address string | ||
| type Coins []Coin | ||
| type Coin struct { | ||
| Denom bool | ||
| Amount int64 | ||
| } |
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