LBRYCommunity/lbcd
1
0
Fork 0
Code Issues 17 Pull requests 4 Projects Releases 28 Packages Wiki Activity

Generate usage from handler data in btcctl.

Browse source 
Rather than having to keep the usage in sync with the supported commands,
simply include the usage as a field in the command handlers map and
dynamically generate the usage from there.
This commit is contained in:
Dave Collins 2013-10-22 10:56:56 -05:00
parent d4f980c71f
commit 9ded3fa2cf
1 changed files with 33 additions and 30 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

63
util/btcctl/btcctl.go
View file

@ -7,6 +7,7 @@ import (
"github.com/conformal/go-flags"
"github.com/davecgh/go-spew/spew"
"os"
"sort"
"strconv"
)
@ -33,6 +34,7 @@ type handlerData struct {
optionalArgs int
displayHandler displayHandler
conversionHandlers []conversionHandler
usage string
}
var (
@ -41,22 +43,22 @@ var (
ErrUsage = errors.New("btcctl usage") // Real usage is shown.
)
// commandHandlers is a map of commands and associate handler data
// that is used to validate correctness and perform the command.
// commandHandlers is a map of commands and associated handler data that is used
// to validate correctness and perform the command.
var commandHandlers = map[string]*handlerData{
"addnode": &handlerData{2, 0, displaySpewDump, nil},
"decoderawtransaction": &handlerData{1, 0, displaySpewDump, nil},
"getbestblockhash": &handlerData{0, 0, displayGeneric, nil},
"getblock": &handlerData{1, 0, displaySpewDump, nil},
"getblockcount": &handlerData{0, 0, displayFloat64, nil},
"getblockhash": &handlerData{1, 0, displayGeneric, []conversionHandler{toInt}},
"getconnectioncount": &handlerData{0, 0, displayFloat64, nil},
"getdifficulty": &handlerData{0, 0, displayFloat64, nil},
"getgenerate": &handlerData{0, 0, displayGeneric, nil},
"getpeerinfo": &handlerData{0, 0, displaySpewDump, nil},
"getrawmempool": &handlerData{0, 0, displaySpewDump, nil},
"getrawtransaction": &handlerData{1, 1, displaySpewDump, []conversionHandler{nil, toInt}},
"stop": &handlerData{0, 0, displayGeneric, nil},
"addnode": &handlerData{2, 0, displaySpewDump, nil, "<ip> <add/remove/onetry>"},
"decoderawtransaction": &handlerData{1, 0, displaySpewDump, nil, "<txhash>"},
"getbestblockhash": &handlerData{0, 0, displayGeneric, nil, ""},
"getblock": &handlerData{1, 0, displaySpewDump, nil, "<blockhash>"},
"getblockcount": &handlerData{0, 0, displayFloat64, nil, ""},
"getblockhash": &handlerData{1, 0, displayGeneric, []conversionHandler{toInt}, "<blocknumber>"},
"getconnectioncount": &handlerData{0, 0, displayFloat64, nil, ""},
"getdifficulty": &handlerData{0, 0, displayFloat64, nil, ""},
"getgenerate": &handlerData{0, 0, displayGeneric, nil, ""},
"getpeerinfo": &handlerData{0, 0, displaySpewDump, nil, ""},
"getrawmempool": &handlerData{0, 0, displaySpewDump, nil, ""},
"getrawtransaction": &handlerData{1, 1, displaySpewDump, []conversionHandler{nil, toInt}, "<txhash> [verbose=0]"},
"stop": &handlerData{0, 0, displayGeneric, nil, ""},
}
// toInt attempts to convert the passed string to an integer. It returns the
@ -195,21 +197,22 @@ func commandHandler(cfg *config, command string, data *handlerData, args []strin
// usage displays the command usage.
func usage(parser *flags.Parser) {
parser.WriteHelp(os.Stderr)
fmt.Fprintf(os.Stderr,
"\nCommands:\n"+
"\taddnode <ip> <add/remove/onetry>\n"+
"\tdecoderawtransaction <txhash>\n"+
"\tgetbestblockhash\n"+
"\tgetblock <blockhash>\n"+
"\tgetblockcount\n"+
"\tgetblockhash <blocknumber>\n"+
"\tgetconnectioncount\n"+
"\tgetdifficulty\n"+
"\tgetgenerate\n"+
"\tgetpeerinfo\n"+
"\tgetrawmempool\n"+
"\tgetrawtransaction <txhash> [verbose=0]\n"+
"\tstop\n")
// Extract usage information for each command from the command handler
// data and sort by command name.
fmt.Fprintf(os.Stderr, "\nCommands:\n")
usageStrings := make([]string, 0, len(commandHandlers))
for command, data := range commandHandlers {
usage := command
if len(data.usage) > 0 {
usage += " " + data.usage
}
usageStrings = append(usageStrings, usage)
}
sort.Sort(sort.StringSlice(usageStrings))
for _, usage := range usageStrings {
fmt.Fprintf(os.Stderr, "\t%s\n", usage)
}
}
func main() {