update cfg/common interface to add Parse()->Read() and Write() methods | add 'ini' format + tests

internal/cnf/common.go

@@ -6,8 +6,11 @@ import (
 
 // ConfigurationFormat is the common interface for all configuration parser
 type ConfigurationFormat interface {
-	// Parse the given file
-	Parse(io.Reader) error
+	// Read the given file
+	Read(io.Reader) error
+
+	// Write the given update to the file
+	Write(io.Writer) error
 
 	// Get the value of a field if it exists
 	Get(string) (string, bool)

internal/cnf/ini.go

@@ -0,0 +1,104 @@
+package cnf
+
+import (
+	"github.com/go-ini/ini"
+	"io"
+	"io/ioutil"
+	"strings"
+)
+
+type Ini struct {
+	sections []string
+	data     *ini.File
+	parsed   bool
+}
+
+// Read extract a reader as its JSON representation
+func (d *Ini) Read(_reader io.Reader) error {
+
+	// 1. get json decoder
+	file, err := ini.Load(ioutil.NopCloser(_reader))
+	if err != nil {
+		return err
+	}
+
+	d.data = file
+	d.sections = file.SectionStrings()
+	d.parsed = true
+	return nil
+
+}
+
+// Write the INI representation to a writer
+func (d *Ini) Write(_writer io.Writer) error {
+	_, err := d.data.WriteTo(_writer)
+	return err
+}
+
+// Get returns the value of a dot-separated path, and if it exists
+// the maximum depth is 2 : Section.Field
+func (d *Ini) Get(_path string) (string, bool) {
+
+	// 1. split path
+	path := strings.Split(_path, ".")
+
+	// 2. fail if too long
+	if len(path) > 2 {
+		return "", false
+	}
+
+	// 3. direct field (no section)
+	if len(path) == 1 {
+		// unknown field
+		if !d.data.Section("").Haskey(path[0]) {
+			return "", false
+		}
+
+		// found
+		return d.data.Section("").Key(path[0]).String(), true
+	}
+
+	// 4. fail on missing section
+	found := false
+	for _, sec := range d.sections {
+		if sec == path[0] {
+			found = true
+			break
+		}
+	}
+	if !found {
+		return "", false
+	}
+
+	// 5. Fail on unknown field
+	if !d.data.Section(path[0]).HasKey(path[1]) {
+		return "", false
+	}
+
+	// 6. return value
+	return d.data.Section(path[0]).Key(path[1]).String(), true
+
+}
+
+// Set the value of a dot-separated path, and creates it if not found
+func (d *Ini) Set(_path, _value string) bool {
+
+	// 1. split path
+	path := strings.Split(_path, ".")
+
+	// 2. fail if too long
+	if len(path) > 2 {
+		return false
+	}
+
+	// 3. direct field (no section)
+	section, field := "", path[0]
+	if len(path) > 1 {
+		section, field = path[0], path[1]
+	}
+
+	// 4. Set field value
+	d.data.Section(section).Key(field).SetValue(_value)
+	return true
+
+}

internal/cnf/ini_test.go

@@ -0,0 +1,152 @@
+package cnf
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestIniGet(t *testing.T) {
+
+	tests := []struct {
+		raw string
+		key string
+	}{
+		{"key = value", "key"},
+		{"[section]\nkey = value", "section.key"},
+		{"[ignoresec]\nignore = xxx\n[section]\nkey = value", "section.key"},
+	}
+
+	for _, test := range tests {
+
+		parser := new(Ini)
+		reader := bytes.NewBufferString(test.raw)
+
+		// try to extract value
+		err := parser.Read(reader)
+		if err != nil {
+			t.Errorf("parse error: %s", err)
+			continue
+		}
+
+		// extract value
+		value, found := parser.Get(test.key)
+		if !found {
+			t.Errorf("expected a result, got none")
+			continue
+		}
+
+		// check value
+		if value != "value" {
+			t.Errorf("expected 'value' got '%s'", value)
+		}
+
+	}
+
+}
+
+func TestIniSetPathExists(t *testing.T) {
+
+	tests := []struct {
+		raw   string
+		key   string
+		value string
+	}{
+		{"key = value", "key", "newvalue"},
+		{"[section]\nkey = value", "section.key", "newvalue"},
+		{"[ignoresec]\nignore = xxx\n[section]\nkey = value", "section.key", "newvalue"},
+	}
+
+	for _, test := range tests {
+
+		parser := new(Ini)
+		reader := bytes.NewBufferString(test.raw)
+
+		// try to extract value
+		err := parser.Read(reader)
+		if err != nil {
+			t.Errorf("parse error: %s", err)
+			continue
+		}
+
+		// update value
+		if !parser.Set(test.key, test.value) {
+			t.Errorf("cannot set '%s' to '%s'", test.key, test.value)
+			continue
+		}
+
+		// check new value
+		value, found := parser.Get(test.key)
+		if !found {
+			t.Errorf("expected a result, got none")
+			continue
+		}
+
+		// check value
+		if value != test.value {
+			t.Errorf("expected '%s' got '%s'", test.value, value)
+		}
+
+	}
+
+}
+
+func TestIniSetCreatePath(t *testing.T) {
+
+	tests := []struct {
+		raw    string
+		key    string
+		ignore string // path to field that must be present after transformation
+		value  string
+	}{
+		{"ignore = xxx", "key", "ignore", "newvalue"},
+		{"ignore = xxx\n[section]\nkey = value", "section.key", "ignore", "newvalue"},
+		{"[section]\nkey = value\nignore = xxx", "section.key", "section.ignore", "newvalue"},
+		{"[ignoresec]\nignore = xxx\n[section]\nkey = value", "section.key", "ignoresec.ignore", "newvalue"},
+	}
+
+	for i, test := range tests {
+
+		parser := new(Ini)
+		reader := bytes.NewBufferString(test.raw)
+
+		// try to extract value
+		err := parser.Read(reader)
+		if err != nil {
+			t.Errorf("[%d] parse error: %s", i, err)
+			continue
+		}
+
+		// update value
+		if !parser.Set(test.key, test.value) {
+			t.Errorf("[%d] cannot set '%s' to '%s'", i, test.key, test.value)
+			continue
+		}
+
+		// check new value
+		value, found := parser.Get(test.key)
+		if !found {
+			t.Errorf("[%d] expected a result, got none", i)
+			continue
+		}
+
+		// check value
+		if value != test.value {
+			t.Errorf("[%d] expected '%s' got '%s'", i, test.value, value)
+			continue
+		}
+
+		// check that ignore field is still there
+		value, found = parser.Get(test.ignore)
+		if !found {
+			t.Errorf("[%d] expected ignore field, got none", i)
+			continue
+		}
+
+		// check value
+		if value != "xxx" {
+			t.Errorf("[%d] expected ignore value to be '%s' got '%s'", i, "xxx", value)
+			continue
+		}
+	}
+
+}

internal/cnf/json.go

@@ -11,8 +11,8 @@ type Json struct {
 	parsed bool
 }
 
-// Parse extract a reader as its JSON representation
-func (d *Json) Parse(_reader io.Reader) error {
+// Read extract a reader as its JSON representation
+func (d *Json) Read(_reader io.Reader) error {
 
 	// 1. get json decoder
 	decoder := json.NewDecoder(_reader)
@@ -26,6 +26,12 @@ func (d *Json) Parse(_reader io.Reader) error {
 
 }
 
+// Write the JSON representation to a writer
+func (d *Json) Write(_writer io.Writer) error {
+	encoder := json.NewEncoder(_writer)
+	return encoder.Encode(&d.data)
+}
+
 // browse returns the target of a dot-separated path (as an interface{} chain where the last is the target if found)
 func (d *Json) browse(_path string) ([]interface{}, bool) {
 

internal/cnf/json_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 )
 
-func TestGet(t *testing.T) {
+func TestJsonGet(t *testing.T) {
 
 	tests := []struct {
 		raw string
@@ -23,7 +23,7 @@ func TestGet(t *testing.T) {
 		reader := bytes.NewBufferString(test.raw)
 
 		// try to extract value
-		err := parser.Parse(reader)
+		err := parser.Read(reader)
 		if err != nil {
 			t.Errorf("parse error: %s", err)
 			continue
@@ -45,7 +45,7 @@ func TestGet(t *testing.T) {
 
 }
 
-func TestGetNotString(t *testing.T) {
+func TestJsonGetNotString(t *testing.T) {
 
 	tests := []struct {
 		raw string
@@ -63,7 +63,7 @@ func TestGetNotString(t *testing.T) {
 		reader := bytes.NewBufferString(test.raw)
 
 		// try to extract value
-		err := parser.Parse(reader)
+		err := parser.Read(reader)
 		if err != nil {
 			t.Errorf("parse error: %s", err)
 			continue
@@ -80,7 +80,7 @@ func TestGetNotString(t *testing.T) {
 
 }
 
-func TestSetPathExistsAndIsString(t *testing.T) {
+func TestJsonSetPathExistsAndIsString(t *testing.T) {
 
 	tests := []struct {
 		raw   string
@@ -99,7 +99,7 @@ func TestSetPathExistsAndIsString(t *testing.T) {
 		reader := bytes.NewBufferString(test.raw)
 
 		// try to extract value
-		err := parser.Parse(reader)
+		err := parser.Read(reader)
 		if err != nil {
 			t.Errorf("parse error: %s", err)
 			continue
@@ -127,7 +127,7 @@ func TestSetPathExistsAndIsString(t *testing.T) {
 
 }
 
-func TestSetCreatePath(t *testing.T) {
+func TestJsonSetCreatePath(t *testing.T) {
 
 	tests := []struct {
 		raw    string
@@ -150,7 +150,7 @@ func TestSetCreatePath(t *testing.T) {
 		reader := bytes.NewBufferString(test.raw)
 
 		// try to extract value
-		err := parser.Parse(reader)
+		err := parser.Read(reader)
 		if err != nil {
 			t.Errorf("[%d] parse error: %s", i, err)
 			continue

internal/cnf/loader.go

@@ -37,7 +37,7 @@ func Load(path string) (ConfigurationFormat, error) {
 		defer file.Close()
 
 		// parse
-		err = confFormat.Parse(file)
+		err = confFormat.Read(file)
 		if err != nil {
 			return nil, fmt.Errorf("cannot parse file as '%s' | %s", extension, err)
 		}
@@ -68,6 +68,8 @@ func loadFromExtension(ext string) ConfigurationFormat {
 	switch ext {
 	case "json":
 		return new(Json)
+	case "ini":
+		return new(Ini)
 	default:
 		return nil
 	}

internal/instruction/cnf.go

@@ -52,6 +52,8 @@ func (d *config) Build(_args string) error {
 
 func (d config) Exec(ctx ExecutionContext) ([]byte, error) {
 
+	fmt.Printf("path is '%v'\n", d.Path)
+
 	return nil, nil
 
 }