1package core
 2
 3type Input struct {
 4	TxId  Hash
 5	Vout  int // index of the output from the TxId
 6	Value uint64
 7}
 8type Output struct {
 9	Value uint64
10}
11
12// Tx holds the data structure of a transaction
13type Tx struct {
14	From       Address
15	To         Address
16	InputCount uint64
17	Inputs     []Input
18	Outputs    []Output
19	Signature  []byte
20}
21
22func NewTx(from, to Address, in []Input, out []Output) *Tx {
23	tx := &Tx{
24		From:       from,
25		To:         to,
26		InputCount: uint64(len(in)),
27		Inputs:     in,
28		Outputs:    out,
29	}
30	return tx
31}
32
33// CheckTx checks if the transaction is consistent
34func CheckTx(tx *Tx) bool {
35	// TODO check that inputs and outputs are not empty
36
37	// check that inputs == outputs
38	totalIn := 0
39	for _, in := range tx.Inputs {
40		totalIn = totalIn + int(in.Value)
41	}
42	totalOut := 0
43	for _, out := range tx.Outputs {
44		totalOut = totalOut + int(out.Value)
45	}
46	if totalIn < totalOut {
47		return false
48	}
49
50	// TODO check signature
51	return true
52}