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parse.go
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parse.go
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package host
import (
"strconv"
"strings"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
)
// ParseIdentifier parses the sequence from the identifier using the provided prefix. This function
// does not need to be used by counterparty chains. SDK generated connection and channel identifiers
// are required to use this format.
func ParseIdentifier(identifier, prefix string) (uint64, error) {
if !strings.HasPrefix(identifier, prefix) {
return 0, sdkerrors.Wrapf(ErrInvalidID, "identifier doesn't contain prefix `%s`", prefix)
}
splitStr := strings.Split(identifier, prefix)
if len(splitStr) != 2 {
return 0, sdkerrors.Wrapf(ErrInvalidID, "identifier must be in format: `%s{N}`", prefix)
}
// sanity check
if splitStr[0] != "" {
return 0, sdkerrors.Wrapf(ErrInvalidID, "identifier must begin with prefix %s", prefix)
}
sequence, err := strconv.ParseUint(splitStr[1], 10, 64)
if err != nil {
return 0, sdkerrors.Wrap(err, "failed to parse identifier sequence")
}
return sequence, nil
}
// MustParseClientStatePath returns the client ID from a client state path. It panics
// if the provided path is invalid or if the clientID is empty.
func MustParseClientStatePath(path string) string {
clientID, err := parseClientStatePath(path)
if err != nil {
panic(err.Error())
}
return clientID
}
// parseClientStatePath returns the client ID from a client state path. It returns
// an error if the provided path is invalid.
func parseClientStatePath(path string) (string, error) {
split := strings.Split(path, "/")
if len(split) != 3 {
return "", sdkerrors.Wrapf(ErrInvalidPath, "cannot parse client state path %s", path)
}
if split[0] != string(KeyClientStorePrefix) {
return "", sdkerrors.Wrapf(ErrInvalidPath, "path does not begin with client store prefix: expected %s, got %s", KeyClientStorePrefix, split[0])
}
if split[2] != KeyClientState {
return "", sdkerrors.Wrapf(ErrInvalidPath, "path does not end with client state key: expected %s, got %s", KeyClientState, split[2])
}
if strings.TrimSpace(split[1]) == "" {
return "", sdkerrors.Wrap(ErrInvalidPath, "clientID is empty")
}
return split[1], nil
}
// ParseConnectionPath returns the connection ID from a full path. It returns
// an error if the provided path is invalid.
func ParseConnectionPath(path string) (string, error) {
split := strings.Split(path, "/")
if len(split) != 2 {
return "", sdkerrors.Wrapf(ErrInvalidPath, "cannot parse connection path %s", path)
}
return split[1], nil
}
// ParseChannelPath returns the port and channel ID from a full path. It returns
// an error if the provided path is invalid.
func ParseChannelPath(path string) (string, string, error) {
split := strings.Split(path, "/")
if len(split) < 5 {
return "", "", sdkerrors.Wrapf(ErrInvalidPath, "cannot parse channel path %s", path)
}
if split[1] != KeyPortPrefix || split[3] != KeyChannelPrefix {
return "", "", sdkerrors.Wrapf(ErrInvalidPath, "cannot parse channel path %s", path)
}
return split[2], split[4], nil
}
// MustParseConnectionPath returns the connection ID from a full path. Panics
// if the provided path is invalid.
func MustParseConnectionPath(path string) string {
connectionID, err := ParseConnectionPath(path)
if err != nil {
panic(err)
}
return connectionID
}
// MustParseChannelPath returns the port and channel ID from a full path. Panics
// if the provided path is invalid.
func MustParseChannelPath(path string) (string, string) {
portID, channelID, err := ParseChannelPath(path)
if err != nil {
panic(err)
}
return portID, channelID
}