cli

README

cli Source

The cli source reads config from parsed flags via a cli.Context.

Format

We expect the use of the urfave/cli package. Upper case flags will be lower cased. Dashes will be used as delimiters for nesting.

Example

micro.Flags(
    cli.StringFlag{
        Name: "database-address",
        Value: "127.0.0.1",
        Usage: "the db address",
    },
    cli.IntFlag{
        Name: "database-port",
        Value: 3306,
        Usage: "the db port",
    },
)

Becomes

{
    "database": {
        "address": "127.0.0.1",
        "port": 3306
    }
}

New and Load Source

Because a cli.Context is needed to retrieve the flags and their values, it is recommended to build your source from within a cli.Action.

func main() {
    // New Service
    service := micro.NewService(
        micro.Name("example"),
        micro.Flags(
            cli.StringFlag{
                Name: "database-address",
                Value: "127.0.0.1",
                Usage: "the db address",
            },
        ),
    )

    var clisrc source.Source

    service.Init(
        micro.Action(func(c *cli.Context) {
            clisrc = cli.NewSource(
                cli.Context(c),
	    )
            // Alternatively, just setup your config right here
        }),
    )
    
    // ... Load and use that source ...
    conf := config.NewConfig()
    conf.Load(clisrc)
}

Documentation

Index

• func Context(c *cli.Context) source.Option
• func NewSource(opts ...source.Option) source.Source
• func WithContext(ctx *cli.Context, opts ...source.Option) source.Source

Functions

func Context

func Context(c *cli.Context) source.Option

Context sets the cli context

func NewSource

func NewSource(opts ...source.Option) source.Source

NewSource returns a config source for integrating parsed flags from a urfave/cli.Context. Hyphens are delimiters for nesting, and all keys are lowercased. The assumption is that command line flags have already been parsed.

Example:

cli.StringFlag{Name: "db-host"},

{
    "database": {
        "host": "localhost"
    }
}

func WithContext

func WithContext(ctx *cli.Context, opts ...source.Option) source.Source

WithContext returns a new source with the context specified. The assumption is that Context is retrieved within an app.Action function.