/
main.go
131 lines (117 loc) · 3.04 KB
/
main.go
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package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"net/url"
"os"
"strings"
goa "goa.design/goa/v3/pkg"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
)
func main() {
tracer.Start(tracer.WithServiceName("goa-basic"))
defer tracer.Stop()
var (
hostF = flag.String("host", "development", "Server host (valid values: development, production)")
addrF = flag.String("url", "", "URL to service host")
versionF = flag.String("version", "v1", "API version")
verboseF = flag.Bool("verbose", false, "Print request and response details")
vF = flag.Bool("v", false, "Print request and response details")
timeoutF = flag.Int("timeout", 30, "Maximum number of seconds to wait for response")
)
flag.Usage = usage
flag.Parse()
var (
addr string
timeout int
debug bool
)
{
addr = *addrF
if addr == "" {
switch *hostF {
case "development":
addr = "http://localhost:8000/calc"
case "production":
addr = "https://{version}.goa.design/calc"
addr = strings.Replace(addr, "{version}", *versionF, -1)
default:
fmt.Fprintf(os.Stderr, "invalid host argument: %q (valid hosts: development|production)\n", *hostF)
os.Exit(1)
}
}
timeout = *timeoutF
debug = *verboseF || *vF
}
var (
scheme string
host string
)
{
u, err := url.Parse(addr)
if err != nil {
fmt.Fprintf(os.Stderr, "invalid URL %#v: %s\n", addr, err)
os.Exit(1)
}
scheme = u.Scheme
host = u.Host
}
var (
endpoint goa.Endpoint
payload interface{}
err error
)
{
switch scheme {
case "http", "https":
endpoint, payload, err = doHTTP(scheme, host, timeout, debug)
case "grpc", "grpcs":
endpoint, payload, err = doGRPC(scheme, host, timeout, debug)
default:
fmt.Fprintf(os.Stderr, "invalid scheme: %q (valid schemes: grpc|grpcs|http|https)\n", scheme)
os.Exit(1)
}
}
if err != nil {
if err == flag.ErrHelp {
os.Exit(0)
}
fmt.Fprintln(os.Stderr, err.Error())
fmt.Fprintln(os.Stderr, "run '"+os.Args[0]+" --help' for detailed usage.")
os.Exit(1)
}
data, err := endpoint(context.Background(), payload)
if err != nil {
fmt.Fprintln(os.Stderr, err.Error())
os.Exit(1)
}
if data != nil {
m, _ := json.MarshalIndent(data, "", " ")
fmt.Println(string(m))
}
}
func usage() {
fmt.Fprintf(os.Stderr, `%s is a command line client for the calc API.
Usage:
%s [-host HOST][-url URL][-timeout SECONDS][-verbose|-v][-version VERSION] SERVICE ENDPOINT [flags]
-host HOST: server host (development). valid values: development, production
-url URL: specify service URL overriding host URL (http://localhost:8080)
-timeout: maximum number of seconds to wait for response (30)
-verbose|-v: print request and response details (false)
-version: API version (v1)
Commands:
%s
Additional help:
%s SERVICE [ENDPOINT] --help
Example:
%s
`, os.Args[0], os.Args[0], indent(httpUsageCommands()), os.Args[0], indent(httpUsageExamples()))
}
func indent(s string) string {
if s == "" {
return ""
}
return " " + strings.Replace(s, "\n", "\n ", -1)
}