add toml provider

.drone.yml

@@ -72,3 +72,22 @@ steps:
   - cd provider/ini
   - golangci-lint run
 
+
+---
+kind: pipeline
+type: docker
+name: toml
+
+steps:
+- name: test 
+  image: golang
+  commands:
+  - cd provider/toml
+  - go test ./... 
+
+- name: golangci-lint
+  image: golangci/golangci-lint:v1.55
+  commands:
+  - cd provider/toml
+  - golangci-lint run
+

provider/toml/fixture/config.toml

@@ -0,0 +1,31 @@
+title = "TOML Example"
+
+[owner]
+name = "Tom Preston-Werner"
+dob = 1979-05-27T07:32:00-08:00 # First class dates
+
+[database]
+server = "192.168.1.1"
+ports = [ 8001, 8001, 8002 ]
+connection_max = 5000
+enabled = true
+
+[servers]
+
+  # Indentation (tabs and/or spaces) is allowed but not required
+  [servers.alpha]
+  ip = "10.0.0.1"
+  dc = "eqdc10"
+
+  [servers.beta]
+  ip = "10.0.0.2"
+  dc = "eqdc10"
+
+[clients]
+data = [ ["gamma", "delta"], [1, 2] ]
+
+# Line breaks are OK when inside arrays
+hosts = [
+  "alpha",
+  "omega"
+]

provider/toml/go.mod

@@ -0,0 +1,15 @@
+module gitoa.ru/go-4devs/config/provider/toml
+
+go 1.21
+
+require (
+	github.com/pelletier/go-toml v1.9.5
+	github.com/stretchr/testify v1.8.4
+	gitoa.ru/go-4devs/config v0.0.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

provider/toml/go.sum

@@ -0,0 +1,14 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pelletier/go-toml v1.9.5 h1:4yBQzkHv+7BHq2PQUZF3Mx0IYxG7LsP222s7Agd3ve8=
+github.com/pelletier/go-toml v1.9.5/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+gitoa.ru/go-4devs/config v0.0.1 h1:9KrOO09YbIMO8qL8aVn/G74DurGdOIW5y3O02bays4I=
+gitoa.ru/go-4devs/config v0.0.1/go.mod h1:xfEC2Al9xnMLJUuekYs3KhJ5BIzWAseNwkMwbN6/xss=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

provider/toml/provider.go

@@ -0,0 +1,71 @@
+package toml
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/pelletier/go-toml"
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/value"
+)
+
+const (
+	Name      = "toml"
+	Separator = "."
+)
+
+var _ config.Provider = (*Provider)(nil)
+
+func NewFile(file string, opts ...Option) (*Provider, error) {
+	tree, err := toml.LoadFile(file)
+	if err != nil {
+		return nil, fmt.Errorf("toml: failed load file: %w", err)
+	}
+
+	return configure(tree, opts...), nil
+}
+
+type Option func(*Provider)
+
+func configure(tree *toml.Tree, opts ...Option) *Provider {
+	prov := &Provider{
+		tree: tree,
+		key: func(s []string) string {
+			return strings.Join(s, Separator)
+		},
+	}
+
+	for _, opt := range opts {
+		opt(prov)
+	}
+
+	return prov
+}
+
+func New(data []byte, opts ...Option) (*Provider, error) {
+	tree, err := toml.LoadBytes(data)
+	if err != nil {
+		return nil, fmt.Errorf("toml failed load data: %w", err)
+	}
+
+	return configure(tree, opts...), nil
+}
+
+type Provider struct {
+	tree *toml.Tree
+	key  func([]string) string
+	name string
+}
+
+func (p *Provider) Name() string {
+	return p.name
+}
+
+func (p *Provider) Value(_ context.Context, path ...string) (config.Value, error) {
+	if k := p.key(path); p.tree.Has(k) {
+		return Value{Value: value.Value{Val: p.tree.Get(k)}}, nil
+	}
+
+	return nil, config.ErrValueNotFound
+}

provider/toml/provider_test.go

@@ -0,0 +1,36 @@
+package toml_test
+
+import (
+	"embed"
+	"testing"
+
+	"gitoa.ru/go-4devs/config/provider/toml"
+	"gitoa.ru/go-4devs/config/test"
+	"gitoa.ru/go-4devs/config/test/require"
+)
+
+//go:embed fixture/*
+var fixtures embed.FS
+
+func TestProvider(t *testing.T) {
+	t.Parallel()
+
+	files, ferr := fixtures.ReadFile("fixture/config.toml")
+	require.NoError(t, ferr)
+
+	prov, err := toml.New(files)
+	require.NoError(t, err)
+
+	m := []int{}
+
+	read := []test.Read{
+		test.NewRead("192.168.1.1", "database.server"),
+		test.NewRead("TOML Example", "title"),
+		test.NewRead("10.0.0.1", "servers.alpha.ip"),
+		test.NewRead(true, "database.enabled"),
+		test.NewRead(5000, "database.connection_max"),
+		test.NewReadUnmarshal(&[]int{8001, 8001, 8002}, &m, "database", "ports"),
+	}
+
+	test.Run(t, prov, read)
+}

provider/toml/value.go

@@ -0,0 +1,41 @@
+package toml
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/value"
+)
+
+type Value struct {
+	value.Value
+}
+
+func (s Value) Int() int {
+	v, _ := s.ParseInt()
+
+	return v
+}
+
+func (s Value) ParseInt() (int, error) {
+	v, err := s.ParseInt64()
+	if err != nil {
+		return 0, fmt.Errorf("toml failed parce int: %w", err)
+	}
+
+	return int(v), nil
+}
+
+func (s Value) Unmarshal(target interface{}) error {
+	b, err := json.Marshal(s.Raw())
+	if err != nil {
+		return fmt.Errorf("%w: %w", config.ErrInvalidValue, err)
+	}
+
+	if err := json.Unmarshal(b, target); err != nil {
+		return fmt.Errorf("%w: %w", config.ErrInvalidValue, err)
+	}
+
+	return nil
+}