add go example

Author: adbenitez

README.md

@@ -7,6 +7,7 @@ An echo bot in multiple languages to get you started.
 | Language                                      | core version |
 | --------------------------------------------- | ------------ |
 | [C](./c)                                      | `1.101.0`    |
+| [Go](./go)                                    | `1.110.0`    |
 | [node.js over cffi (legacy)](./nodejs_cffi)   | `1.101.0`    |
 | [node.js over jsonrpc](./nodejs_napi_jsonrpc) | `1.101.0`    |
 | [Python](./python)                            | `1.94.0`     |

go/.gitignore

@@ -0,0 +1 @@
+accounts

go/README.md

@@ -0,0 +1,34 @@
+# Echo Bot - Go
+
+### Installing deltachat-rpc-server
+
+For the bot to work, first `deltachat-rpc-server` program needs to
+be installed and available in your `PATH`. To install it from source run:
+
+```sh
+cargo install --git https://github.com/deltachat/deltachat-core-rust/ deltachat-rpc-server
+```
+
+For more info and pre-built binaries check:
+https://github.com/deltachat/deltachat-core-rust/tree/master/deltachat-rpc-server
+
+### Using the bot
+
+To run the bot, the first time you need to pass the credentials
+as command line arguments:
+
+```sh
+go run . $yourEmail $yourPassword
+```
+
+This will create a subdirectory called `accounts` in the current
+working directory, this is where deltachat stores the state.  The
+credentials will be stored there so further invocations do not need
+them specified again:
+
+```sh
+go run .
+```
+
+Open a chat with the bot address in your Delta Chat and write some messages
+to test the bot.

go/echobot.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/deltachat/deltachat-rpc-client-go/deltachat"
+)
+
+func logEvent(event *deltachat.Event) {
+	log.Printf("%v: %v", event.Type, event.Msg)
+}
+
+func main() {
+	rpc := deltachat.NewRpcIO()
+	defer rpc.Stop()
+	rpc.Start()
+
+	manager := &deltachat.AccountManager{rpc}
+	sysinfo, _ := manager.SystemInfo()
+	log.Println("Running deltachat core", sysinfo["deltachat_core_version"])
+
+	bot := deltachat.NewBotFromAccountManager(manager)
+	bot.On(deltachat.EVENT_INFO, logEvent)
+	bot.On(deltachat.EVENT_WARNING, logEvent)
+	bot.On(deltachat.EVENT_ERROR, logEvent)
+	bot.OnNewMsg(func(msg *deltachat.Message) {
+		snapshot, _ := msg.Snapshot()
+		chat := deltachat.Chat{bot.Account, snapshot.ChatId}
+		chat.SendText(snapshot.Text)
+	})
+
+	if !bot.IsConfigured() {
+		log.Println("Bot not configured, configuring...")
+		err := bot.Configure(os.Args[1], os.Args[2])
+		if err != nil {
+			log.Fatalln(err)
+		}
+	}
+
+	addr, _ := bot.GetConfig("addr")
+	log.Println("Listening at:", addr)
+	bot.RunForever()
+}

go/go.mod

@@ -0,0 +1,10 @@
+module github.com/deltachat-bot/echo/go
+
+go 1.19
+
+require github.com/deltachat/deltachat-rpc-client-go v0.1.0
+
+require (
+	github.com/creachadair/jrpc2 v0.44.0 // indirect
+	golang.org/x/sync v0.1.0 // indirect
+)

go/go.sum

@@ -0,0 +1,8 @@
+github.com/creachadair/jrpc2 v0.44.0 h1:O7H8XMliOemo2u598dN7Knld8K3TZgOnY9Mm0IIqt28=
+github.com/creachadair/jrpc2 v0.44.0/go.mod h1:mVyD3HybrKVaZqFNRVGZGWH9Gd1OXtnmfqZT7T1oLQw=
+github.com/deltachat/deltachat-rpc-client-go v0.1.0 h1:vdJbAQh7OGaXgRcFwQLrsclA1RQdPV7eF0CxxmpGqzI=
+github.com/deltachat/deltachat-rpc-client-go v0.1.0/go.mod h1:LiHW4HxGGwP4yfO5qZWRf26KwYVoUz5IrIkShHuNpWM=
+github.com/fortytw2/leaktest v1.3.0 h1:u8491cBMTQ8ft8aeV+adlcytMZylmA5nnwwkRZjI8vw=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=