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irc-client.go
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irc-client.go
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package msg
import (
"encoding/json"
"fmt"
"net"
"sync"
"cuelang.org/go/cue"
"gopkg.in/irc.v3"
hofcontext "github.com/hofstadter-io/hof/flow/context"
"github.com/hofstadter-io/hof/flow/flow"
"github.com/hofstadter-io/hof/lib/cuetils"
)
type IrcClient struct{}
func NewIrcClient(val cue.Value) (hofcontext.Runner, error) {
return &IrcClient{}, nil
}
func (T *IrcClient) Run(ctx *hofcontext.Context) (interface{}, error) {
// todo, check failure modes, fill, not return error?
// (in all tasks)
// do failed message handlings fail the client connection and IRC flow?
val := ctx.Value
var config irc.ClientConfig
var host string
ferr := func() error {
ctx.CUELock.Lock()
defer func() {
ctx.CUELock.Unlock()
}()
var err error
config, err = buildIrcConfig(val)
if err != nil {
fmt.Println("irc: buildConfig err:", err)
return err
}
handler, err := buildIrcHandler(ctx, val)
if err != nil {
fmt.Println("irc: buildHandler err:", err)
return err
}
config.Handler = handler
h := val.LookupPath(cue.ParsePath("host"))
if h.Err() != nil {
return h.Err()
}
host, err = h.String()
if err != nil {
return err
}
return nil
}()
if ferr != nil {
return nil, ferr
}
conn, err := net.Dial("tcp", host)
if err != nil {
return nil, err
}
// Create the client
client := irc.NewClient(conn, config)
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
err = client.Run()
if err != nil {
return
}
}()
wg.Wait()
return nil, err
}
func buildIrcConfig(val cue.Value) (irc.ClientConfig, error) {
config := irc.ClientConfig{}
n := val.LookupPath(cue.ParsePath("nick"))
if n.Err() != nil {
return config, n.Err()
}
nick, err := n.String()
if err != nil {
return config, err
}
config.Nick = nick
p := val.LookupPath(cue.ParsePath("pass"))
if p.Err() != nil {
return config, p.Err()
}
pass, err := p.String()
if err != nil {
return config, err
}
config.Pass = pass
return config, nil
}
func buildIrcHandler(ct_ctx *hofcontext.Context, val cue.Value) (irc.HandlerFunc, error) {
fmt.Println("Building IRC handler:")
ctx := val.Context()
c := val.LookupPath(cue.ParsePath("channel"))
if c.Err() != nil {
return nil, c.Err()
}
channel, err := c.String()
if err != nil {
return nil, err
}
lM := val.LookupPath(cue.ParsePath("log_msgs"))
if lM.Err() != nil {
return nil, lM.Err()
}
logMsgs, err := lM.Bool()
if err != nil {
return nil, err
}
cHandler := val.LookupPath(cue.ParsePath("handler"))
if !cHandler.Exists() {
fmt.Println("got here")
return nil, cHandler.Err()
}
fmt.Println("handler:", cHandler)
handler := func(c *irc.Client, m *irc.Message) {
// turn incoming msg into a cue.Value
bs, err := json.Marshal(m)
if err != nil {
fmt.Println("Error(json):", err)
return
}
mv := ctx.CompileBytes(bs)
if mv.Err() != nil {
fmt.Println("Error(cuepile):", mv.Err())
return
}
ms, err := cuetils.PrintCue(mv)
if err != nil {
fmt.Println("Error(print):", err)
return
}
if logMsgs {
fmt.Println(ms)
}
// some shortcut reposonse for all IRC
switch m.Command {
case "PING":
// do we need a pong config value?
// hopefully not, as one would assume this has been standardized
host := m.Params[0]
c.Write("PONG " + host)
return
case "001":
msgs := val.LookupPath(cue.ParsePath("init_msgs"))
iter, err := msgs.List()
if err != nil {
fmt.Printf("Error: IRC.init_msgs should be a list of strings\n%v\n", err)
}
for iter.Next() {
sv := iter.Value()
s, err := sv.String()
if err != nil {
fmt.Printf("Error: IRC.init_msgs should be a list of strings\n%v\n", err)
}
fmt.Println("sending(init):", s)
c.Write(s)
}
return
}
v := ctx.CompileString("{...}")
v = v.Unify(cHandler)
v = v.FillPath(cue.ParsePath("msg"), mv)
// is this a flow
errV := v.LookupPath(cue.ParsePath("error"))
respV := v.LookupPath(cue.ParsePath("resp"))
flowV := v.LookupPath(cue.ParsePath("flow"))
fmt.Println("errV:", errV)
fmt.Println("respV:", respV)
fmt.Println("flowV:", flowV)
// log any errors
if errV.Exists() {
fmt.Println("Error in handler:", errV)
return
}
// write back simple responses
if respV.Exists() {
fmt.Println("found respV")
s, err := respV.String()
if err != nil {
fmt.Println("Error(respV):", err)
}
fmt.Println("sending(msg):", s)
c.Writef("PRIVMSG %s :%s", channel, s)
return
}
// handle flows
if flowV.Exists() {
// build new value
v := ctx.CompileString("{...}")
v = v.Unify(flowV)
orig := ct_ctx.FlowStack
ct_ctx.FlowStack = append(ct_ctx.FlowStack, fmt.Sprint(val.Path()))
p, err := flow.NewFlow(ct_ctx, v)
if err != nil {
fmt.Println("Error(flow/new):", err)
return
}
err = p.Start()
if err != nil {
fmt.Println("Error(flow/run):", err)
return
}
ct_ctx.FlowStack = orig
rV := p.Final.LookupPath(cue.ParsePath("resp"))
if !rV.Exists() {
fmt.Println("Error(flow/resp): does not exist")
return
}
s, err := rV.String()
if err != nil {
fmt.Println("Error(flow/rVstr):", err)
return
}
// fill in go-irc.Message and then turn that into a string
if len(s) > 0 {
fmt.Println("sending(flow/msg):", s)
c.Writef("PRIVMSG %s :%s", channel, s)
}
return
}
// otherwise, unknown message
fmt.Println("unhandled message:", ms)
}
return handler, nil
}