Merge pull request #3 from ConduitIO/add-parsing-decorator

feat: Add parsing configuration decorator
ConduitIO · Dec 18, 2024 · 9853ff7 · 9853ff7
2 parents a81cef8 + d38bc09
commit 9853ff7
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diff --git a/README.md b/README.md
@@ -103,6 +103,72 @@ func main() {
 }
 ```
 
+### Configuration
+
+Ecdysis provides an automatic way to parse a configuration file, environment variables, and flags using the [`viper`](https://github.com/spf13/viper) library. To use it, you need to implement the `CommandWithConfig` interface.
+
+The order of precedence for configuration values is:
+
+1. Default values (slices and maps are not currently supported)
+2. Configuration file
+3. Environment variables
+4. Flags
+
+
+> [!IMPORTANT]  
+> For flags, it's important to set default values to ensure that the configuration will be correctly parsed. 
+> Otherwise, they will be empty, and it will be considered as if the user set that intentionally.
+> example: `flags.SetDefault("config.path", c.cfg.ConduitCfgPath)`
+
+```go
+var (
+    _ ecdysis.CommandWithConfiguration = (*RootCommand)(nil)
+)
+
+type ConduitConfig struct {
+    ConduitCfgPath string `long:"config.path" usage:"global conduit configuration file" default:"./conduit.yaml"`
+
+    Connectors struct {
+        Path string `long:"connectors.path" usage:"path to standalone connectors' directory"`
+    }
+
+    // ...
+}
+
+type RootFlags struct {
+    ConduitConfig // you can embed any configuration, and it'll use the proper tags
+}
+
+type RootCommand struct {
+    flags RootFlags
+    cfg   ConduitConfig
+}
+
+func (c *RootCommand) ParseConfig() ecdysis.Config {
+    return ecdysis.Config{
+        EnvPrefix:  "CONDUIT", // prefix for environment variables
+        ParsedCfg:  &c.cfg, // where configuration will be parsed
+        ConfigPath: c.flags.ConduitCfgPath, // where to read the configuration file
+        DefaultCfg: c.cfg, // where to extract default values from
+    }
+}
+
+func (c *RootCommand) Execute(_ context.Context) error {
+    // c.cfg is now populated with the right parsed configuration
+    return nil
+}
+
+func (c *RootCommand) Flags() []ecdysis.Flag {
+    flags := ecdysis.BuildFlags(&c.flags)
+
+    // set a default value for each flag
+    flags.SetDefault("config.path", c.cfg.ConduitCfgPath) 
+    // ...
+
+    return flags
+}
+````
+
 ## Flags
 
 Ecdysis provides a way to define flags using field tags. Flags will be

diff --git a/config.go b/config.go
@@ -0,0 +1,109 @@
+// Copyright © 2024 Meroxa, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ecdysis
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+type Config struct {
+	EnvPrefix     string
+	Parsed        any
+	DefaultValues any
+	Path          string
+}
+
+// setDefaults sets the default values for the configuration. slices and maps are not supported.
+func setDefaults(v *viper.Viper, defaults interface{}) {
+	val := reflect.ValueOf(defaults)
+	typ := reflect.TypeOf(defaults)
+
+	if val.Kind() == reflect.Ptr {
+		if val.IsNil() {
+			return
+		}
+		val = val.Elem()
+		typ = typ.Elem()
+	}
+
+	if val.Kind() != reflect.Struct {
+		return
+	}
+
+	for i := 0; i < val.NumField(); i++ {
+		field := val.Field(i)
+		fieldType := typ.Field(i)
+
+		fieldName := fieldType.Tag.Get("long")
+		if fieldName == "" {
+			fieldName = fieldType.Tag.Get("short")
+		}
+
+		if fieldName == "" {
+			continue
+		}
+
+		switch field.Kind() { //nolint:exhaustive // no need to handle all cases
+		case reflect.Struct:
+			setDefaults(v, field.Interface())
+		case reflect.Ptr:
+			if !field.IsNil() {
+				setDefaults(v, field.Interface())
+			}
+		default:
+			if field.CanInterface() {
+				v.SetDefault(fieldName, field.Interface())
+			}
+		}
+	}
+}
+
+// parseConfig parses the configuration (from cfg and cmd) into the viper instance.
+func parseConfig(v *viper.Viper, cfg Config, cmd *cobra.Command) error {
+	// Handle env variables
+	v.SetEnvPrefix(cfg.EnvPrefix)
+	v.AutomaticEnv()
+	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+
+	// Handle config file
+	v.SetConfigFile(cfg.Path)
+	if err := v.ReadInConfig(); err != nil {
+		return fmt.Errorf("fatal error config file: %w", err)
+	}
+
+	var errors []error
+
+	// Handle flags
+	cmd.Flags().VisitAll(func(f *pflag.Flag) {
+		if err := v.BindPFlag(f.Name, f); err != nil {
+			errors = append(errors, err)
+		}
+	})
+
+	if len(errors) > 0 {
+		var errStrs []string
+		for _, err := range errors {
+			errStrs = append(errStrs, err.Error())
+		}
+		return fmt.Errorf("error binding flags: %s", strings.Join(errStrs, "; "))
+	}
+	return nil
+}
diff --git a/decorators.go b/decorators.go
@@ -21,17 +21,23 @@ import (
 	"fmt"
 	"log/slog"
 	"os"
+	"reflect"
 	"strings"
 	"time"
 
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
 )
 
 var DefaultDecorators = []Decorator{
 	CommandWithLoggerDecorator{},
 	CommandWithAliasesDecorator{},
 	CommandWithFlagsDecorator{},
+
+	// CommandWithConfigDecorator needs to be after CommandWithFlagsDecorator to make sure the flags are parsed.
+	CommandWithConfigDecorator{},
+
 	CommandWithDocsDecorator{},
 	CommandWithHiddenDecorator{},
 	CommandWithSubCommandsDecorator{},
@@ -242,6 +248,62 @@ func (CommandWithFlagsDecorator) Decorate(_ *Ecdysis, cmd *cobra.Command, c Comm
 	return nil
 }
 
+// -- PARSING CONFIGURATION --------------------------------------------------------------------
+
+// CommandWithConfig can be implemented by a command to parsing configuration.
+type CommandWithConfig interface {
+	Command
+
+	Config() Config
+}
+
+// CommandWithConfigDecorator is a decorator that sets the command flags.
+type CommandWithConfigDecorator struct{}
+
+// Decorate parses the configuration based on flags.
+func (CommandWithConfigDecorator) Decorate(_ *Ecdysis, cmd *cobra.Command, c Command) error {
+	v, ok := c.(CommandWithConfig)
+	if !ok {
+		return nil
+	}
+
+	old := cmd.PreRunE
+	cmd.PreRunE = func(cmd *cobra.Command, args []string) error {
+		if old != nil {
+			err := old(cmd, args)
+			if err != nil {
+				return err
+			}
+		}
+
+		cfg := v.Config()
+
+		// Ensure Parsed is a pointer
+		if reflect.ValueOf(cfg.Parsed).Kind() != reflect.Ptr {
+			return fmt.Errorf("parsed must be a pointer")
+		}
+
+		// Ensure both cfg.Parsed and cfg.DefaultValues are the same type
+		if reflect.TypeOf(cfg.Parsed) != reflect.TypeOf(cfg.DefaultValues) {
+			return fmt.Errorf("parsed and DefaultValues must be the same type")
+		}
+
+		viper := viper.New()
+
+		setDefaults(viper, cfg.DefaultValues)
+
+		if err := parseConfig(viper, cfg, cmd); err != nil {
+			return fmt.Errorf("error parsing config: %w", err)
+		}
+
+		if err := viper.Unmarshal(cfg.Parsed); err != nil {
+			return fmt.Errorf("error unmarshalling config: %w", err)
+		}
+		return nil
+	}
+	return nil
+}
+
 // -- DOCS ---------------------------------------------------------------------
 
 // CommandWithDocs can be implemented by a command to provide documentation.

diff --git a/go.mod b/go.mod
@@ -6,7 +6,31 @@ require (
 	github.com/google/go-cmp v0.6.0
 	github.com/spf13/cobra v1.8.1
 	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.19.0
+	github.com/stretchr/testify v1.9.0
 	go.uber.org/mock v0.5.0
 )
 
-require github.com/inconshreveable/mousetrap v1.1.0 // indirect
+require (
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/sagikazarmark/locafero v0.4.0 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.11.0 // indirect
+	github.com/spf13/cast v1.6.0 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
+	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/go.sum b/go.sum
@@ -1,14 +1,79 @@
 github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
+github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
+github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
+github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
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 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
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+github.com/sagikazarmark/locafero v0.4.0 h1:HApY1R9zGo4DBgr7dqsTH/JJxLTTsOt7u6keLGt6kNQ=
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+github.com/sourcegraph/conc v0.3.0 h1:OQTbbt6P72L20UqAkXXuLOj79LfEanQ+YQFNpLA9ySo=
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 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
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+golang.org/x/exp v0.0.0-20230905200255-921286631fa9/go.mod h1:S2oDrQGGwySpoQPVqRShND87VCbxmc6bL1Yd2oYrm6k=
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