130 lines
2.9 KiB
Go
130 lines
2.9 KiB
Go
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package lnwire
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import (
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"fmt"
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"io"
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)
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//Multiple Clearing Requests are possible by putting this inside an array of
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//clearing requests
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type HTLCAddRequest struct {
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//We can use a different data type for this if necessary...
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ChannelID uint64
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//ID of this request
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StagingID uint64
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//When the HTLC expires
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Expiry uint32
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//Amount to pay in the hop
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//Difference between hop and first item in blob is the fee to complete
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Amount CreditsAmount
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//Hash160 address of the next hop.
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NextHop [20]byte
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//Contract Type
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//first 4 bits is n, second for is m, in n-of-m "multisig"
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ContractType uint8
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//Redemption Hashes
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RedemptionHashes []*[20]byte
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//Data to parse&pass on to the next node
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//Eventually, we need to make this into a group of 2 nested structs?
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Blob []byte
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}
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func (c *HTLCAddRequest) Decode(r io.Reader, pver uint32) error {
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//ChannelID(8)
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//StagingID(8)
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//Expiry(4)
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//Amount(4)
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//NextHop(20)
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//ContractType(1)
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//RedemptionHashes (numOfHashes * 20 + numOfHashes)
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//Blob(2+blobsize)
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err := readElements(r,
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&c.ChannelID,
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&c.StagingID,
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&c.Expiry,
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&c.Amount,
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&c.NextHop,
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&c.ContractType,
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&c.RedemptionHashes,
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&c.Blob,
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)
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if err != nil {
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return err
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}
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return nil
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}
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//Creates a new HTLCAddRequest
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func NewHTLCAddRequest() *HTLCAddRequest {
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return &HTLCAddRequest{}
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}
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//Serializes the item from the HTLCAddRequest struct
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//Writes the data to w
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func (c *HTLCAddRequest) Encode(w io.Writer, pver uint32) error {
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err := writeElements(w,
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c.ChannelID,
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c.StagingID,
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c.Expiry,
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c.Amount,
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c.NextHop,
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c.ContractType,
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c.RedemptionHashes,
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c.Blob,
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)
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if err != nil {
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return err
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}
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return nil
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}
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func (c *HTLCAddRequest) Command() uint32 {
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return CmdHTLCAddRequest
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}
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func (c *HTLCAddRequest) MaxPayloadLength(uint32) uint32 {
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//base size ~110, but blob can be variable.
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//shouldn't be bigger than 8K though...
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return 8192
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}
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//Makes sure the struct data is valid (e.g. no negatives or invalid pkscripts)
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func (c *HTLCAddRequest) Validate() error {
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if c.Amount < 0 {
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//While fees can be negative, it's too confusing to allow
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//negative payments. Maybe for some wallets, but not this one!
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return fmt.Errorf("Amount paid cannot be negative.")
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}
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//We're good!
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return nil
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}
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func (c *HTLCAddRequest) String() string {
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var redemptionHashes string
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for i, rh := range c.RedemptionHashes {
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redemptionHashes += fmt.Sprintf("\n\tSlice\t%d\n", i)
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redemptionHashes += fmt.Sprintf("\t\tRedemption Hash: %x\n", *rh)
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}
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return fmt.Sprintf("\n--- Begin HTLCAddRequest ---\n") +
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fmt.Sprintf("ChannelID:\t%d\n", c.ChannelID) +
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fmt.Sprintf("StagingID:\t%d\n", c.StagingID) +
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fmt.Sprintf("Expiry:\t\t%d\n", c.Expiry) +
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fmt.Sprintf("Amount\t\t%d\n", c.Amount) +
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fmt.Sprintf("NextHop\t\t%x\n", c.NextHop) +
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fmt.Sprintf("ContractType:\t%d (%b)\n", c.ContractType, c.ContractType) +
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fmt.Sprintf("RedemptionHashes:") +
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redemptionHashes +
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fmt.Sprintf("Blob:\t\t\t\t%x\n", c.Blob) +
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fmt.Sprintf("--- End HTLCAddRequest ---\n")
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}
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