Move packages to proejct/pkg to follow go project folder structure convention (#1190)

pkg/builder/client/client.go

@@ -0,0 +1,92 @@
+/*
+Copyright 2016 The Fission Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package client
+
+import (
+	"bytes"
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/pkg/errors"
+	"go.uber.org/zap"
+
+	builder "github.com/fission/fission/pkg/builder"
+	ferror "github.com/fission/fission/pkg/error"
+)
+
+type (
+	Client struct {
+		logger *zap.Logger
+		url    string
+	}
+)
+
+func MakeClient(logger *zap.Logger, builderUrl string) *Client {
+	return &Client{
+		logger: logger.Named("builder_client"),
+		url:    strings.TrimSuffix(builderUrl, "/"),
+	}
+}
+
+func (c *Client) Build(req *builder.PackageBuildRequest) (*builder.PackageBuildResponse, error) {
+	body, err := json.Marshal(req)
+	if err != nil {
+		return nil, errors.Wrap(err, "error marshaling json")
+	}
+
+	maxRetries := 20
+	var resp *http.Response
+
+	for i := 0; i < maxRetries; i++ {
+		resp, err = http.Post(c.url, "application/json", bytes.NewReader(body))
+
+		if err == nil {
+			if resp.StatusCode == 200 {
+				break
+			}
+			err = ferror.MakeErrorFromHTTP(resp)
+		}
+
+		if i < maxRetries-1 {
+			time.Sleep(50 * time.Duration(2*i) * time.Millisecond)
+			c.logger.Error("error building package, retrying", zap.Error(err))
+			continue
+		}
+
+		return nil, err
+	}
+
+	defer resp.Body.Close()
+
+	rBody, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		c.logger.Error("error reading resp body", zap.Error(err))
+		return nil, err
+	}
+
+	pkgBuildResp := builder.PackageBuildResponse{}
+	err = json.Unmarshal([]byte(rBody), &pkgBuildResp)
+	if err != nil {
+		c.logger.Error("error parsing resp body", zap.Error(err))
+		return nil, err
+	}
+
+	return &pkgBuildResp, ferror.MakeErrorFromHTTP(resp)
+}