github.com/humans-group/gqlgen@v0.7.2/cmd/init.go (about)

     1  package cmd
     2  
     3  import (
     4  	"bytes"
     5  	"fmt"
     6  	"io/ioutil"
     7  	"os"
     8  	"strings"
     9  
    10  	"github.com/99designs/gqlgen/codegen"
    11  	"github.com/pkg/errors"
    12  	"github.com/urfave/cli"
    13  	"gopkg.in/yaml.v2"
    14  )
    15  
    16  var configComment = `
    17  # .gqlgen.yml example
    18  #
    19  # Refer to https://gqlgen.com/config/
    20  # for detailed .gqlgen.yml documentation.
    21  `
    22  
    23  var schemaDefault = `
    24  # GraphQL schema example
    25  #
    26  # https://gqlgen.com/getting-started/
    27  
    28  type Todo {
    29    id: ID!
    30    text: String!
    31    done: Boolean!
    32    user: User!
    33  }
    34  
    35  type User {
    36    id: ID!
    37    name: String!
    38  }
    39  
    40  type Query {
    41    todos: [Todo!]!
    42  }
    43  
    44  input NewTodo {
    45    text: String!
    46    userId: String!
    47  }
    48  
    49  type Mutation {
    50    createTodo(input: NewTodo!): Todo!
    51  }
    52  `
    53  
    54  var initCmd = cli.Command{
    55  	Name:  "init",
    56  	Usage: "create a new gqlgen project",
    57  	Flags: []cli.Flag{
    58  		cli.BoolFlag{Name: "verbose, v", Usage: "show logs"},
    59  		cli.StringFlag{Name: "config, c", Usage: "the config filename"},
    60  		cli.StringFlag{Name: "server", Usage: "where to write the server stub to", Value: "server/server.go"},
    61  		cli.StringFlag{Name: "schema", Usage: "where to write the schema stub to", Value: "schema.graphql"},
    62  	},
    63  	Action: func(ctx *cli.Context) {
    64  		initSchema(ctx.String("schema"))
    65  		config := initConfig(ctx)
    66  
    67  		GenerateGraphServer(config, ctx.String("server"))
    68  	},
    69  }
    70  
    71  func GenerateGraphServer(config *codegen.Config, serverFilename string) {
    72  	for _, filename := range config.SchemaFilename {
    73  		schemaRaw, err := ioutil.ReadFile(filename)
    74  		if err != nil {
    75  			fmt.Fprintln(os.Stderr, "unable to open schema: "+err.Error())
    76  			os.Exit(1)
    77  		}
    78  		config.SchemaStr[filename] = string(schemaRaw)
    79  	}
    80  
    81  	if err := config.Check(); err != nil {
    82  		fmt.Fprintln(os.Stderr, "invalid config format: "+err.Error())
    83  		os.Exit(1)
    84  	}
    85  
    86  	if err := codegen.Generate(*config); err != nil {
    87  		fmt.Fprintln(os.Stderr, err.Error())
    88  		os.Exit(1)
    89  	}
    90  
    91  	if err := codegen.GenerateServer(*config, serverFilename); err != nil {
    92  		fmt.Fprintln(os.Stderr, err.Error())
    93  		os.Exit(1)
    94  	}
    95  
    96  	fmt.Fprintf(os.Stdout, "Exec \"go run ./%s\" to start GraphQL server\n", serverFilename)
    97  }
    98  
    99  func initConfig(ctx *cli.Context) *codegen.Config {
   100  	var config *codegen.Config
   101  	var err error
   102  	configFilename := ctx.String("config")
   103  	if configFilename != "" {
   104  		config, err = codegen.LoadConfig(configFilename)
   105  	} else {
   106  		config, err = codegen.LoadConfigFromDefaultLocations()
   107  	}
   108  
   109  	if config != nil {
   110  		fmt.Fprintf(os.Stderr, "init failed: a configuration file already exists at %s\n", config.FilePath)
   111  		os.Exit(1)
   112  	}
   113  
   114  	if !os.IsNotExist(errors.Cause(err)) {
   115  		fmt.Fprintln(os.Stderr, err.Error())
   116  		os.Exit(1)
   117  	}
   118  
   119  	if configFilename == "" {
   120  		configFilename = "gqlgen.yml"
   121  	}
   122  	config = codegen.DefaultConfig()
   123  
   124  	config.Resolver = codegen.PackageConfig{
   125  		Filename: "resolver.go",
   126  		Type:     "Resolver",
   127  	}
   128  
   129  	var buf bytes.Buffer
   130  	buf.WriteString(strings.TrimSpace(configComment))
   131  	buf.WriteString("\n\n")
   132  	{
   133  		var b []byte
   134  		b, err = yaml.Marshal(config)
   135  		if err != nil {
   136  			fmt.Fprintln(os.Stderr, "unable to marshal yaml: "+err.Error())
   137  			os.Exit(1)
   138  		}
   139  		buf.Write(b)
   140  	}
   141  
   142  	err = ioutil.WriteFile(configFilename, buf.Bytes(), 0644)
   143  	if err != nil {
   144  		fmt.Fprintln(os.Stderr, "unable to write config file: "+err.Error())
   145  		os.Exit(1)
   146  	}
   147  
   148  	return config
   149  }
   150  
   151  func initSchema(schemaFilename string) {
   152  	_, err := os.Stat(schemaFilename)
   153  	if !os.IsNotExist(err) {
   154  		return
   155  	}
   156  
   157  	err = ioutil.WriteFile(schemaFilename, []byte(strings.TrimSpace(schemaDefault)), 0644)
   158  	if err != nil {
   159  		fmt.Fprintln(os.Stderr, "unable to write schema file: "+err.Error())
   160  		os.Exit(1)
   161  	}
   162  }