103 lines
2.9 KiB
Go
103 lines
2.9 KiB
Go
package generate
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import (
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"fmt"
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"go/token"
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"io/ioutil"
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"path/filepath"
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"strings"
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"gopkg.in/yaml.v2"
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)
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var defaultConfig = &Config{
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Schema: "schema.graphql",
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Queries: "queries.graphql",
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Generated: "generated.go",
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ContextType: "context.Context",
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}
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type Config struct {
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// The package name for the output code; defaults to the directory name of
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// Generated
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Package string `yaml:"package"`
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// The filename with the GraphQL schema (in SDL format); defaults to
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// schema.graphql
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// TODO: Allow fetching a schema via introspection (will need to figure out
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// how to convert that to SDL).
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Schema string `yaml:"schema"`
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// The filename with the queries; defaults to queries.graphql
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// TODO: allow multiple files?
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Queries string `yaml:"queries"`
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// The filename to which to write the generated code; defaults to
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// generated.go
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Generated string `yaml:"generated"`
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// Set to the fully-qualified name of a type which generated helpers should
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// accept and use as the context.Context for HTTP requests. Defaults to
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// context.Context; set to the empty string to omit context entirely.
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ContextType string `yaml:"context_type"`
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// If set, a snippet of Go code to get a *graphql.Client from the context
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// (which will be named ctx). For example, this might do
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// ctx.Value(myKey).(*graphql.Client). If omitted, client must be
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// passed to each method explicitly.
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// TODO: what if you want to do an import in this snippet, e.g. for a
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// getter function, global var, or a context-key-type?
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// TODO: what if you want to return err?
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ClientGetter string `yaml:"client_getter"`
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}
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func (c *Config) ValidateAndFillDefaults(configFilename string) error {
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// Make paths relative to config dir
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configDir := filepath.Dir(configFilename)
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c.Schema = filepath.Join(configDir, c.Schema)
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c.Queries = filepath.Join(configDir, c.Queries)
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c.Generated = filepath.Join(configDir, c.Generated)
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if c.Package == "" {
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abs, err := filepath.Abs(c.Generated)
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if err != nil {
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return fmt.Errorf("unable to guess package-name: %v", err)
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}
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base := filepath.Base(filepath.Dir(abs))
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if !token.IsIdentifier(base) {
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return fmt.Errorf("unable to guess package-name: %v is not a valid identifier", base)
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}
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c.Package = base
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}
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return nil
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}
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func (c *Config) ContextPackage() string {
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if c.ContextType == "" {
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return ""
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}
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i := strings.LastIndex(c.ContextType, ".")
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return c.ContextType[:i]
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}
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func ReadAndValidateConfig(filename string) (*Config, error) {
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config := *defaultConfig
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if filename != "" {
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text, err := ioutil.ReadFile(filename)
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if err != nil {
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return nil, fmt.Errorf("unreadable config file %v: %v", filename, err)
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}
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err = yaml.Unmarshal(text, &config)
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if err != nil {
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return nil, fmt.Errorf("invalid config file %v: %v", filename, err)
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}
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}
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err := config.ValidateAndFillDefaults(filename)
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if err != nil {
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return nil, fmt.Errorf("invalid config file %v: %v", filename, err)
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}
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return &config, nil
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}
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