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Asim Aslam 2019-07-28 19:47:25 +01:00
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# Agent
Agent is a library used to create commands, inputs and robot services
## Getting Started
- [Commands](#commands) - Commands are functions executed by the bot based on text based pattern matching.
- [Inputs](#inputs) - Inputs are plugins for communication e.g Slack, Telegram, IRC, etc.
- [Services](#services) - Write bots as micro services
## Commands
Commands are functions executed by the bot based on text based pattern matching.
### Write a Command
```go
import "github.com/micro/go-micro/agent/command"
func Ping() command.Command {
usage := "ping"
description := "Returns pong"
return command.NewCommand("ping", usage, desc, func(args ...string) ([]byte, error) {
return []byte("pong"), nil
})
}
```
### Register the command
Add the command to the Commands map with a pattern key that can be matched by golang/regexp.Match
```go
import "github.com/micro/go-micro/agent/command"
func init() {
command.Commands["^ping$"] = Ping()
}
```
### Rebuild Micro
Build binary
```shell
cd github.com/micro/micro
// For local use
go build -i -o micro ./main.go
// For docker image
CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags '-w' -i -o micro ./main.go
```
## Inputs
Inputs are plugins for communication e.g Slack, HipChat, XMPP, IRC, SMTP, etc, etc.
New inputs can be added in the following way.
### Write an Input
Write an input that satisfies the Input interface.
```go
type Input interface {
// Provide cli flags
Flags() []cli.Flag
// Initialise input using cli context
Init(*cli.Context) error
// Stream events from the input
Stream() (Conn, error)
// Start the input
Start() error
// Stop the input
Stop() error
// name of the input
String() string
}
```
### Register the input
Add the input to the Inputs map.
```go
import "github.com/micro/micro/bot/input"
func init() {
input.Inputs["name"] = MyInput
}
```
### Rebuild Micro
Build binary
```shell
cd github.com/micro/micro
// For local use
go build -i -o micro ./main.go
// For docker image
CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags '-w' -i -o micro ./main.go
```
## Services
The micro bot supports the ability to create commands as micro services.
### How does it work?
The bot watches the service registry for services with it's namespace. The default namespace is `go.micro.bot`.
Any service within this namespace will automatically be added to the list of available commands. When a command
is executed, the bot will call the service with method `Command.Exec`. It also expects the method `Command.Help`
to exist for usage info.
The service interface is as follows and can be found at [go-micro/agent/proto](https://github.com/micro/go-micro/agent/blob/master/proto/bot.proto)
```
syntax = "proto3";
package go.micro.bot;
service Command {
rpc Help(HelpRequest) returns (HelpResponse) {};
rpc Exec(ExecRequest) returns (ExecResponse) {};
}
message HelpRequest {
}
message HelpResponse {
string usage = 1;
string description = 2;
}
message ExecRequest {
repeated string args = 1;
}
message ExecResponse {
bytes result = 1;
string error = 2;
}
```
### Example
Here's an example echo command as a microservice
```go
package main
import (
"fmt"
"strings"
"github.com/micro/go-micro"
"golang.org/x/net/context"
proto "github.com/micro/go-micro/agent/proto"
)
type Command struct{}
// Help returns the command usage
func (c *Command) Help(ctx context.Context, req *proto.HelpRequest, rsp *proto.HelpResponse) error {
// Usage should include the name of the command
rsp.Usage = "echo"
rsp.Description = "This is an example bot command as a micro service which echos the message"
return nil
}
// Exec executes the command
func (c *Command) Exec(ctx context.Context, req *proto.ExecRequest, rsp *proto.ExecResponse) error {
rsp.Result = []byte(strings.Join(req.Args, " "))
// rsp.Error could be set to return an error instead
// the function error would only be used for service level issues
return nil
}
func main() {
service := micro.NewService(
micro.Name("go.micro.bot.echo"),
)
service.Init()
proto.RegisterCommandHandler(service.Server(), new(Command))
if err := service.Run(); err != nil {
fmt.Println(err)
}
}
```