added basic plugin structure

This commit is contained in:
Kasper Juul Hermansen 2022-11-01 14:26:54 +01:00
commit a693cbad37
Signed by: kjuulh
GPG Key ID: 0F95C140730F2F23
18 changed files with 481 additions and 0 deletions

10
README.md Normal file
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# Char
```yaml
# file: .char.yml
registry: git.front.kjuulh.io
plugins:
"kjuulh/char#/plugins/gocli":
vars:
name: "char"
```

40
cmd/char/ls.go Normal file
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package char
import (
"fmt"
"git.front.kjuulh.io/kjuulh/char/pkg/register"
"github.com/spf13/cobra"
)
func NewLsCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "ls",
RunE: func(cmd *cobra.Command, args []string) error {
ctx := cmd.Context()
r, err := register.
NewPluginRegisterBuilder().
Add("gocli", "").
Build(ctx)
if err != nil {
return err
}
about, err := r.About(ctx)
if err != nil {
return err
}
for plugin, aboutText := range about {
fmt.Printf("plugin: %s\n", plugin)
fmt.Printf("\tabout: %s\n", aboutText)
fmt.Println()
}
return nil
},
}
return cmd
}

15
cmd/char/root.go Normal file
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package char
import "github.com/spf13/cobra"
func NewCharCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "char",
}
cmd.AddCommand(
NewLsCommand(),
)
return cmd
}

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../../../../

3
examples/basic/test.sh Executable file
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#!/bin/bash
go run ../../main.go ls

27
go.mod Normal file
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module git.front.kjuulh.io/kjuulh/char
go 1.19
require (
github.com/hashicorp/go-hclog v0.14.1
github.com/hashicorp/go-plugin v1.4.5
github.com/spf13/cobra v1.6.1
golang.org/x/sync v0.0.0-20190423024810-112230192c58
)
require (
github.com/fatih/color v1.7.0 // indirect
github.com/golang/protobuf v1.3.4 // indirect
github.com/hashicorp/yamux v0.0.0-20180604194846-3520598351bb // indirect
github.com/inconshreveable/mousetrap v1.0.1 // indirect
github.com/mattn/go-colorable v0.1.4 // indirect
github.com/mattn/go-isatty v0.0.10 // indirect
github.com/mitchellh/go-testing-interface v0.0.0-20171004221916-a61a99592b77 // indirect
github.com/oklog/run v1.0.0 // indirect
github.com/spf13/pflag v1.0.5 // indirect
golang.org/x/net v0.0.0-20190311183353-d8887717615a // indirect
golang.org/x/sys v0.0.0-20191008105621-543471e840be // indirect
golang.org/x/text v0.3.0 // indirect
google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 // indirect
google.golang.org/grpc v1.27.1 // indirect
)

87
go.sum Normal file
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@ -0,0 +1,87 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.4 h1:87PNWwrRvUSnqS4dlcBU/ftvOIBep4sYuBLlh6rX2wk=
github.com/golang/protobuf v1.3.4/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
github.com/hashicorp/go-hclog v0.14.1 h1:nQcJDQwIAGnmoUWp8ubocEX40cCml/17YkF6csQLReU=
github.com/hashicorp/go-hclog v0.14.1/go.mod h1:whpDNt7SSdeAju8AWKIWsul05p54N/39EeqMAyrmvFQ=
github.com/hashicorp/go-plugin v1.4.5 h1:oTE/oQR4eghggRg8VY7PAz3dr++VwDNBGCcOfIvHpBo=
github.com/hashicorp/go-plugin v1.4.5/go.mod h1:viDMjcLJuDui6pXb8U4HVfb8AamCWhHGUjr2IrTF67s=
github.com/hashicorp/yamux v0.0.0-20180604194846-3520598351bb h1:b5rjCoWHc7eqmAS4/qyk21ZsHyb6Mxv/jykxvNTkU4M=
github.com/hashicorp/yamux v0.0.0-20180604194846-3520598351bb/go.mod h1:+NfK9FKeTrX5uv1uIXGdwYDTeHna2qgaIlx54MXqjAM=
github.com/inconshreveable/mousetrap v1.0.1 h1:U3uMjPSQEBMNp1lFxmllqCPM6P5u/Xq7Pgzkat/bFNc=
github.com/inconshreveable/mousetrap v1.0.1/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
github.com/jhump/protoreflect v1.6.0 h1:h5jfMVslIg6l29nsMs0D8Wj17RDVdNYti0vDN/PZZoE=
github.com/mattn/go-colorable v0.1.4 h1:snbPLB8fVfU9iwbbo30TPtbLRzwWu6aJS6Xh4eaaviA=
github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
github.com/mattn/go-isatty v0.0.10 h1:qxFzApOv4WsAL965uUPIsXzAKCZxN2p9UqdhFS4ZW10=
github.com/mattn/go-isatty v0.0.10/go.mod h1:qgIWMr58cqv1PHHyhnkY9lrL7etaEgOFcMEpPG5Rm84=
github.com/mitchellh/go-testing-interface v0.0.0-20171004221916-a61a99592b77 h1:7GoSOOW2jpsfkntVKaS2rAr1TJqfcxotyaUcuxoZSzg=
github.com/mitchellh/go-testing-interface v0.0.0-20171004221916-a61a99592b77/go.mod h1:kRemZodwjscx+RGhAo8eIhFbs2+BFgRtFPeD/KE+zxI=
github.com/oklog/run v1.0.0 h1:Ru7dDtJNOyC66gQ5dQmaCa0qIsAUFY3sFpK1Xk8igrw=
github.com/oklog/run v1.0.0/go.mod h1:dlhp/R75TPv97u0XWUtDeV/lRKWPKSdTuV0TZvrmrQA=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/spf13/cobra v1.6.1 h1:o94oiPyS4KD1mPy2fmcYYHHfCxLqYjJOhGsCHFZtEzA=
github.com/spf13/cobra v1.6.1/go.mod h1:IOw/AERYS7UzyrGinqmz6HLUo219MORXGxhbaJUqzrY=
github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a h1:oWX7TPOiFAMXLq8o0ikBYfCJVlRHBcsciT5bXOrH628=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20191008105621-543471e840be h1:QAcqgptGM8IQBC9K/RC4o+O9YmqEm0diQn9QmZw/0mU=
golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 h1:gSJIx1SDwno+2ElGhA4+qG2zF97qiUzTM+rQ0klBOcE=
google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.27.1 h1:zvIju4sqAGvwKspUQOhwnpcqSbzi7/H6QomNNjTL4sk=
google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

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go 1.19
use .

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go.work.sum Normal file
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golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=

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main.go Normal file
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package main
import (
"log"
"git.front.kjuulh.io/kjuulh/char/cmd/char"
)
func main() {
if err := char.NewCharCmd().Execute(); err != nil {
log.Fatal(err)
}
}

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package script

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pkg/register/plugin.go Normal file
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package register
type Plugin interface {
About() string
}

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package register
import (
"net/rpc"
"github.com/hashicorp/go-plugin"
)
type PluginAPI struct {
Impl Plugin
}
func (pa *PluginAPI) Server(*plugin.MuxBroker) (any, error) {
return &PluginServer{Impl: pa.Impl}, nil
}
func (*PluginAPI) Client(b *plugin.MuxBroker, c *rpc.Client) (any, error) {
return &PluginClient{client: c}, nil
}

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package register
import (
"context"
"os"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/go-plugin"
)
type PluginBuilder struct {
serveConfig *plugin.ServeConfig
}
func NewPluginBuilder(name string, p Plugin) *PluginBuilder {
logger := hclog.New(&hclog.LoggerOptions{
Level: hclog.Trace,
Output: os.Stderr,
JSONFormat: false,
})
var pluginMap = map[string]plugin.Plugin{
name: &PluginAPI{
Impl: p,
},
}
serveConfig := &plugin.ServeConfig{
HandshakeConfig: plugin.HandshakeConfig{
ProtocolVersion: 1,
MagicCookieKey: "BASIC_PLUGIN",
MagicCookieValue: "char",
},
Plugins: pluginMap,
Logger: logger,
}
return &PluginBuilder{
serveConfig: serveConfig,
}
}
func (pr *PluginBuilder) Serve(ctx context.Context) error {
plugin.Serve(
pr.serveConfig,
)
return nil
}

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@ -0,0 +1,22 @@
package register
import (
"log"
"net/rpc"
)
type PluginClient struct {
client *rpc.Client
}
var _ Plugin = &PluginClient{}
func (pc *PluginClient) About() string {
var resp string
err := pc.client.Call("Plugin.About", new(any), &resp)
if err != nil {
log.Fatal(err)
}
return resp
}

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@ -0,0 +1,147 @@
package register
import (
"context"
"errors"
"fmt"
"os"
"os/exec"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/go-plugin"
"golang.org/x/sync/errgroup"
)
type PluginRegisterBuilder struct {
plugins map[string]PluginAPI
}
func NewPluginRegisterBuilder() *PluginRegisterBuilder {
return &PluginRegisterBuilder{}
}
func (pr *PluginRegisterBuilder) Add(name, path string) *PluginRegisterBuilder {
pr.plugins[name] = PluginAPI{}
return pr
}
func (pr *PluginRegisterBuilder) Build(ctx context.Context) (*PluginRegister, error) {
clients := make(map[string]*pluginClientWrapper, 0)
errgroup, _ := errgroup.WithContext(ctx)
for name, p := range pr.plugins {
name, p := name, p
errgroup.Go(func() error {
client := plugin.NewClient(&plugin.ClientConfig{
HandshakeConfig: plugin.HandshakeConfig{
ProtocolVersion: 1,
MagicCookieKey: "BASIC_PLUGIN",
MagicCookieValue: "char",
},
Logger: hclog.New(&hclog.LoggerOptions{
Name: "char",
Output: os.Stdout,
Level: hclog.Debug,
}),
Cmd: exec.Command("sh", "-c", fmt.Sprintf(
"(cd ./.char/plugins/%s; go run plugins/%s/main.go)",
name,
name,
)),
Plugins: map[string]plugin.Plugin{
name: &p,
},
})
rpcClient, err := client.Client()
if err != nil {
return err
}
raw, err := rpcClient.Dispense(name)
if err != nil {
return err
}
pluginApi, ok := raw.(Plugin)
if !ok {
return errors.New("could not cast as plugin")
}
clients[name] = &pluginClientWrapper{
plugin: pluginApi,
client: client,
}
return nil
})
}
err := errgroup.Wait()
if err != nil {
return nil, err
}
return &PluginRegister{
clients: clients,
}, nil
}
// ---
type pluginClientWrapper struct {
plugin Plugin
client *plugin.Client
}
func (pcw *pluginClientWrapper) Close() {
pcw.client.Kill()
}
// ---
type PluginRegister struct {
clients map[string]*pluginClientWrapper
}
func (pr *PluginRegister) Close() error {
errgroup, _ := errgroup.WithContext(context.Background())
for _, c := range pr.clients {
c := c
errgroup.Go(func() error {
c.Close()
return nil
})
}
if err := errgroup.Wait(); err != nil {
return err
}
return nil
}
func (pr *PluginRegister) About(ctx context.Context) (map[string]string, error) {
list := make(map[string]string, len(pr.clients))
errgroup, ctx := errgroup.WithContext(ctx)
for n, c := range pr.clients {
n, c := n, c
errgroup.Go(func() error {
about := c.plugin.About()
list[n] = about
return nil
})
}
if err := errgroup.Wait(); err != nil {
return nil, err
}
return list, nil
}

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@ -0,0 +1,10 @@
package register
type PluginServer struct {
Impl Plugin
}
func (ps *PluginServer) About(args any, resp *string) error {
*resp = ps.Impl.About()
return nil
}

29
plugins/gocli/main.go Normal file
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@ -0,0 +1,29 @@
package main
import (
"context"
"log"
"git.front.kjuulh.io/kjuulh/char/pkg/register"
)
type GoCliPlugin struct {
}
// About implements register.Plugin
func (*GoCliPlugin) About() string {
return "gocli"
}
var _ register.Plugin = &GoCliPlugin{}
func main() {
if err := register.
NewPluginBuilder(
"gocli",
&GoCliPlugin{},
).
Serve(context.Background()); err != nil {
log.Fatal(err)
}
}