/
example_cli.go
240 lines (223 loc) Β· 6.29 KB
/
example_cli.go
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package example
import (
"os"
"path/filepath"
"strings"
"goa.design/goa/v3/codegen"
"goa.design/goa/v3/expr"
)
// CLIFiles returns example client tool main implementation for each server
// expression in the design.
func CLIFiles(genpkg string, root *expr.RootExpr) []*codegen.File {
var fw []*codegen.File
for _, svr := range root.API.Servers {
if m := exampleCLIMain(genpkg, root, svr); m != nil {
fw = append(fw, m)
}
}
return fw
}
// exampleCLIMain returns an example client tool main implementation for the
// given server expression.
func exampleCLIMain(genpkg string, root *expr.RootExpr, svr *expr.ServerExpr) *codegen.File {
svrdata := Servers.Get(svr)
path := filepath.Join("cmd", svrdata.Dir+"-cli", "main.go")
if _, err := os.Stat(path); !os.IsNotExist(err) {
return nil // file already exists, skip it.
}
specs := []*codegen.ImportSpec{
{Path: "context"},
{Path: "encoding/json"},
{Path: "flag"},
{Path: "fmt"},
{Path: "net/url"},
{Path: "os"},
{Path: "strings"},
codegen.GoaImport(""),
}
sections := []*codegen.SectionTemplate{
codegen.Header("", "main", specs),
&codegen.SectionTemplate{
Name: "cli-main-start",
Source: cliMainStartT,
Data: map[string]interface{}{
"Server": svrdata,
},
FuncMap: map[string]interface{}{
"join": strings.Join,
},
},
&codegen.SectionTemplate{
Name: "cli-main-var-init",
Source: cliMainVarInitT,
Data: map[string]interface{}{
"Server": svrdata,
},
FuncMap: map[string]interface{}{
"join": strings.Join,
},
},
&codegen.SectionTemplate{
Name: "cli-main-endpoint-init",
Source: cliMainEndpointInitT,
Data: map[string]interface{}{
"Server": svrdata,
},
FuncMap: map[string]interface{}{
"join": strings.Join,
"toUpper": strings.ToUpper,
},
},
&codegen.SectionTemplate{Name: "cli-main-end", Source: cliMainEndT},
&codegen.SectionTemplate{
Name: "cli-main-usage",
Source: cliMainUsageT,
Data: map[string]interface{}{
"APIName": root.API.Name,
"Server": svrdata,
},
FuncMap: map[string]interface{}{
"toUpper": strings.ToUpper,
"join": strings.Join,
},
},
}
return &codegen.File{Path: path, SectionTemplates: sections, SkipExist: true}
}
const (
// input: map[string]interface{}{"Server": *Data}
cliMainStartT = `func main() {
var (
hostF = flag.String("host", {{ printf "%q" .Server.DefaultHost.Name }}, "Server host (valid values: {{ (join .Server.AvailableHosts ", ") }})")
addrF = flag.String("url", "", "URL to service host")
{{ range .Server.Variables }}
{{ .VarName }}F = flag.String({{ printf "%q" .Name }}, {{ printf "%q" .DefaultValue }}, {{ printf "%q" .Description }})
{{- end }}
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()
`
// input: map[string]interface{}{"Server": *Data}
cliMainVarInitT = `var (
addr string
timeout int
debug bool
)
{
addr = *addrF
if addr == "" {
switch *hostF {
{{- range $h := .Server.Hosts }}
case {{ printf "%q" $h.Name }}:
addr = {{ printf "%q" ($h.DefaultURL $.Server.DefaultTransport.Type) }}
{{- range $h.Variables }}
{{- if .Values }}
var {{ .VarName }}Seen bool
{
for _, v := range []string{ {{ range $v := .Values }}"{{ $v }}",{{ end }} } {
if v == *{{ .VarName }}F {
{{ .VarName }}Seen = true
break
}
}
}
if !{{ .VarName }}Seen {
fmt.Fprintf(os.Stderr, "invalid value for URL '{{ .Name }}' variable: %q (valid values: {{ join .Values "," }})\n", *{{ .VarName }}F)
os.Exit(1)
}
{{- end }}
addr = strings.Replace(addr, {{ printf "\"{%s}\"" .Name }}, *{{ .VarName }}F, -1)
{{- end }}
{{- end }}
default:
fmt.Fprintf(os.Stderr, "invalid host argument: %q (valid hosts: {{ join .Server.AvailableHosts "|" }})\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
}
`
// input: map[string]interface{}{"Server": *Data}
cliMainEndpointInitT = `var(
endpoint goa.Endpoint
payload interface{}
err error
)
{
switch scheme {
{{- range $t := .Server.Transports }}
case "{{ $t.Type }}", "{{ $t.Type }}s":
endpoint, payload, err = do{{ toUpper $t.Name }}(scheme, host, timeout, debug)
{{- end }}
default:
fmt.Fprintf(os.Stderr, "invalid scheme: %q (valid schemes: {{ join .Server.Schemes "|" }})\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)
}
`
cliMainEndT = `
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))
}
}
`
// input: map[string]interface{}{"APIName": string, "Server": *Data}
cliMainUsageT = `
func usage() {
fmt.Fprintf(os.Stderr, ` + "`" + `%s is a command line client for the {{ .APIName }} API.
Usage:
%s [-host HOST][-url URL][-timeout SECONDS][-verbose|-v]{{ range .Server.Variables }}[-{{ .Name }} {{ toUpper .Name }}]{{ end }} SERVICE ENDPOINT [flags]
-host HOST: server host ({{ .Server.DefaultHost.Name }}). valid values: {{ (join .Server.AvailableHosts ", ") }}
-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)
{{- range .Server.Variables }}
-{{ .Name }}: {{ .Description }} ({{ .DefaultValue }})
{{- end }}
Commands:
%s
Additional help:
%s SERVICE [ENDPOINT] --help
Example:
%s
` + "`" + `, os.Args[0], os.Args[0], indent({{ .Server.DefaultTransport.Type }}UsageCommands()), os.Args[0], indent({{ .Server.DefaultTransport.Type }}UsageExamples()))
}
func indent(s string) string {
if s == "" {
return ""
}
return " " + strings.Replace(s, "\n", "\n ", -1)
}
`
)