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httpclientproxy.go
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httpclientproxy.go
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package codegen
import (
"bufio"
"bytes"
"github.com/sirupsen/logrus"
"github.com/unionj-cloud/go-doudou/cmd/internal/astutils"
v3helper "github.com/unionj-cloud/go-doudou/cmd/internal/openapi/v3"
"github.com/unionj-cloud/go-doudou/toolkit/copier"
"github.com/unionj-cloud/go-doudou/version"
"go/ast"
"go/parser"
"go/token"
"io/ioutil"
"os"
"path/filepath"
"strings"
"text/template"
)
var cpimportTmpl = `
"context"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/sirupsen/logrus"
"github.com/slok/goresilience"
"github.com/go-resty/resty/v2"
"github.com/slok/goresilience/circuitbreaker"
rerrors "github.com/slok/goresilience/errors"
"github.com/slok/goresilience/metrics"
"github.com/slok/goresilience/retry"
"github.com/slok/goresilience/timeout"
v3 "github.com/unionj-cloud/go-doudou/toolkit/openapi/v3"
"os"
"time"
"{{.VoPackage}}"
`
var appendTmpl = `
{{- range $m := .Meta.Methods }}
func (receiver *{{$.SvcName}}ClientProxy) {{$m.Name}}(ctx context.Context, _headers map[string]string, {{- range $i, $p := $m.Params}}
{{- if ne $p.Type "context.Context" }}
{{- $p.Name}} {{$p.Type}},
{{- end }}
{{- end }}) (_resp *resty.Response, {{- range $i, $r := $m.Results}}
{{- if $i}},{{end}}
{{- $r.Name}} {{$r.Type}}
{{- end }}) {
if _err := receiver.runner.Run(ctx, func(ctx context.Context) error {
_resp, {{ range $i, $r := $m.Results }}{{- if $i}},{{- end}}{{- $r.Name }}{{- end }} = receiver.client.{{$m.Name}}(
ctx,
_headers,
{{- range $p := $m.Params }}
{{- if ne $p.Type "context.Context" }}
{{- if isVarargs $p.Type }}
{{ $p.Name }}...,
{{- else }}
{{ $p.Name }},
{{- end }}
{{- end }}
{{- end }}
)
{{- range $r := $m.Results }}
{{- if eq $r.Type "error" }}
if {{ $r.Name }} != nil {
return errors.Wrap({{ $r.Name }}, "call {{$m.Name}} fail")
}
{{- end }}
{{- end }}
return nil
}); _err != nil {
// you can implement your fallback logic here
if errors.Is(_err, rerrors.ErrCircuitOpen) {
receiver.logger.Error(_err)
}
{{- range $r := $m.Results }}
{{- if eq $r.Type "error" }}
{{ $r.Name }} = errors.Wrap(_err, "call {{$m.Name}} fail")
{{- end }}
{{- end }}
}
return
}
{{- end }}
`
var baseTmpl = `/**
* Generated by go-doudou {{.Version}}.
* You can edit it as your need.
*/
package client
import ()
type {{.SvcName}}ClientProxy struct {
client *{{.SvcName}}Client
logger *logrus.Logger
runner goresilience.Runner
}
` + appendTmpl + `
type ProxyOption func(*{{.SvcName}}ClientProxy)
func WithRunner(runner goresilience.Runner) ProxyOption {
return func(proxy *{{.SvcName}}ClientProxy) {
proxy.runner = runner
}
}
func WithLogger(logger *logrus.Logger) ProxyOption {
return func(proxy *{{.SvcName}}ClientProxy) {
proxy.logger = logger
}
}
func New{{.SvcName}}ClientProxy(client *{{.SvcName}}Client, opts ...ProxyOption) *{{.SvcName}}ClientProxy {
cp := &{{.SvcName}}ClientProxy{
client: client,
logger: logrus.StandardLogger(),
}
for _, opt := range opts {
opt(cp)
}
if cp.runner == nil {
var mid []goresilience.Middleware
mid = append(mid, metrics.NewMiddleware("{{.ServicePackage}}_client", metrics.NewPrometheusRecorder(prometheus.DefaultRegisterer)))
mid = append(mid, circuitbreaker.NewMiddleware(circuitbreaker.Config{
ErrorPercentThresholdToOpen: 50,
MinimumRequestToOpen: 6,
SuccessfulRequiredOnHalfOpen: 1,
WaitDurationInOpenState: 5 * time.Second,
MetricsSlidingWindowBucketQuantity: 10,
MetricsBucketDuration: 1 * time.Second,
}),
timeout.NewMiddleware(timeout.Config{
Timeout: 3 * time.Minute,
}),
retry.NewMiddleware(retry.Config{
Times: 3,
}))
cp.runner = goresilience.RunnerChain(mid...)
}
return cp
}
`
func unimplementedSvcMethods(meta *astutils.InterfaceMeta, clientfile string) {
fset := token.NewFileSet()
root, err := parser.ParseFile(fset, clientfile, nil, parser.ParseComments)
if err != nil {
panic(err)
}
sc := astutils.NewStructCollector(astutils.ExprString)
ast.Walk(sc, root)
if handlers, exists := sc.Methods[meta.Name+"ClientProxy"]; exists {
var notimplemented []astutils.MethodMeta
for _, item := range meta.Methods {
for _, handler := range handlers {
if item.Name == handler.Name {
goto L
}
}
notimplemented = append(notimplemented, item)
L:
}
meta.Methods = notimplemented
}
}
// GenGoClientProxy wraps client with resiliency features
func GenGoClientProxy(dir string, ic astutils.InterfaceCollector) {
var (
err error
clientfile string
f *os.File
tpl *template.Template
buf bytes.Buffer
clientDir string
fi os.FileInfo
modfile string
modName string
firstLine string
modf *os.File
meta astutils.InterfaceMeta
clientProxyTmpl string
importBuf bytes.Buffer
)
clientDir = filepath.Join(dir, "client")
if err = os.MkdirAll(clientDir, os.ModePerm); err != nil {
panic(err)
}
clientfile = filepath.Join(clientDir, "clientproxy.go")
fi, err = os.Stat(clientfile)
if err != nil && !os.IsNotExist(err) {
panic(err)
}
err = copier.DeepCopy(ic.Interfaces[0], &meta)
if err != nil {
panic(err)
}
if fi != nil {
logrus.Warningln("New content will be append to clientproxy.go file")
if f, err = os.OpenFile(clientfile, os.O_APPEND, os.ModePerm); err != nil {
panic(err)
}
defer f.Close()
clientProxyTmpl = appendTmpl
unimplementedSvcMethods(&meta, clientfile)
} else {
if f, err = os.Create(clientfile); err != nil {
panic(err)
}
defer f.Close()
clientProxyTmpl = baseTmpl
}
modfile = filepath.Join(dir, "go.mod")
if modf, err = os.Open(modfile); err != nil {
panic(err)
}
reader := bufio.NewReader(modf)
firstLine, _ = reader.ReadString('\n')
modName = strings.TrimSpace(strings.TrimPrefix(firstLine, "module"))
funcMap := make(map[string]interface{})
funcMap["isVarargs"] = v3helper.IsVarargs
if tpl, err = template.New("clientproxy.go.tmpl").Funcs(funcMap).Parse(clientProxyTmpl); err != nil {
panic(err)
}
if err = tpl.Execute(&buf, struct {
VoPackage string
Meta astutils.InterfaceMeta
ServicePackage string
ServiceAlias string
SvcName string
Version string
}{
VoPackage: modName + "/vo",
Meta: meta,
ServicePackage: modName,
ServiceAlias: ic.Package.Name,
SvcName: ic.Interfaces[0].Name,
Version: version.Release,
}); err != nil {
panic(err)
}
original, err := ioutil.ReadAll(f)
if err != nil {
panic(err)
}
original = append(original, buf.Bytes()...)
if tpl, err = template.New("cpimportimpl.go.tmpl").Parse(cpimportTmpl); err != nil {
panic(err)
}
if err = tpl.Execute(&importBuf, struct {
ConfigPackage string
VoPackage string
}{
VoPackage: modName + "/vo",
ConfigPackage: modName + "/config",
}); err != nil {
panic(err)
}
original = astutils.AppendImportStatements(original, importBuf.Bytes())
astutils.FixImport(original, clientfile)
}