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funcfile.go
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funcfile.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
yaml "gopkg.in/yaml.v2"
)
var (
validfn = [...]string{
"func.yaml",
"func.yml",
"func.json",
}
errUnexpectedFileFormat = errors.New("unexpected file format for function file")
)
type funcfile struct {
App *string `yaml:"app,omitempty",json:"app,omitempty"`
Name string `yaml:"name,omitempty",json:"name,omitempty"`
Version string `yaml:"version,omitempty",json:"version,omitempty"`
Runtime *string `yaml:"runtime,omitempty",json:"runtime,omitempty"`
Entrypoint *string `yaml:"entrypoint,omitempty",json:"entrypoint,omitempty"`
Route *string `yaml:"route,omitempty",json:"route,omitempty"`
Type *string `yaml:"type,omitempty",json:"type,omitempty"`
Memory *int64 `yaml:"memory,omitempty",json:"memory,omitempty"`
Config map[string]string `yaml:"config,omitempty",json:"config,omitempty"`
Build []string `yaml:"build,omitempty",json:"build,omitempty"`
}
func (ff *funcfile) FullName() string {
fname := ff.Name
if ff.Version != "" {
fname = fmt.Sprintf("%s:%s", fname, ff.Version)
}
return fname
}
func (ff *funcfile) RuntimeTag() (runtime, tag string) {
if ff.Runtime == nil {
return "", ""
}
rt := *ff.Runtime
tagpos := strings.Index(rt, ":")
if tagpos == -1 {
return rt, ""
}
return rt[:tagpos], rt[tagpos+1:]
}
func findFuncfile() (*funcfile, error) {
for _, fn := range validfn {
if exists(fn) {
return parsefuncfile(fn)
}
}
return nil, newNotFoundError("could not find function file")
}
func parsefuncfile(path string) (*funcfile, error) {
ext := filepath.Ext(path)
switch ext {
case ".json":
return decodeFuncfileJSON(path)
case ".yaml", ".yml":
return decodeFuncfileYAML(path)
}
return nil, errUnexpectedFileFormat
}
func storefuncfile(path string, ff *funcfile) error {
ext := filepath.Ext(path)
switch ext {
case ".json":
return encodeFuncfileJSON(path, ff)
case ".yaml", ".yml":
return encodeFuncfileYAML(path, ff)
}
return errUnexpectedFileFormat
}
func decodeFuncfileJSON(path string) (*funcfile, error) {
f, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("could not open %s for parsing. Error: %v", path, err)
}
ff := new(funcfile)
err = json.NewDecoder(f).Decode(ff)
return ff, err
}
func decodeFuncfileYAML(path string) (*funcfile, error) {
b, err := ioutil.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("could not open %s for parsing. Error: %v", path, err)
}
ff := new(funcfile)
err = yaml.Unmarshal(b, ff)
return ff, err
}
func encodeFuncfileJSON(path string, ff *funcfile) error {
f, err := os.Open(path)
if err != nil {
return fmt.Errorf("could not open %s for encoding. Error: %v", path, err)
}
return json.NewEncoder(f).Encode(ff)
}
func encodeFuncfileYAML(path string, ff *funcfile) error {
b, err := yaml.Marshal(ff)
if err != nil {
return fmt.Errorf("could not encode function file. Error: %v", err)
}
return ioutil.WriteFile(path, b, os.FileMode(0644))
}