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corge-http.go
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corge-http.go
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// Code generated by zanzibar
// @generated
// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package corgehttpclient
import (
"context"
"fmt"
"time"
"github.com/afex/hystrix-go/hystrix"
zanzibar "github.com/uber/zanzibar/runtime"
module "github.com/uber/zanzibar/examples/example-gateway/build/clients/corge-http/module"
clientsCorgeCorge "github.com/uber/zanzibar/examples/example-gateway/build/gen-code/clients/corge/corge"
)
// Client defines corge-http client interface.
type Client interface {
HTTPClient() *zanzibar.HTTPClient
EchoString(
ctx context.Context,
reqHeaders map[string]string,
args *clientsCorgeCorge.Corge_EchoString_Args,
) (string, map[string]string, error)
}
// corgeHTTPClient is the http client.
type corgeHTTPClient struct {
clientID string
httpClient *zanzibar.HTTPClient
circuitBreakerDisabled bool
requestUUIDHeaderKey string
calleeHeader string
callerHeader string
callerName string
calleeName string
}
// NewClient returns a new http client.
func NewClient(deps *module.Dependencies) Client {
ip := deps.Default.Config.MustGetString("sidecarRouter.default.http.ip")
port := deps.Default.Config.MustGetInt("sidecarRouter.default.http.port")
callerHeader := deps.Default.Config.MustGetString("sidecarRouter.default.http.callerHeader")
calleeHeader := deps.Default.Config.MustGetString("sidecarRouter.default.http.calleeHeader")
callerName := deps.Default.Config.MustGetString("serviceName")
calleeName := deps.Default.Config.MustGetString("clients.corge-http.serviceName")
baseURL := fmt.Sprintf("http://%s:%d", ip, port)
timeoutVal := int(deps.Default.Config.MustGetInt("clients.corge-http.timeout"))
timeout := time.Millisecond * time.Duration(
timeoutVal,
)
defaultHeaders := make(map[string]string)
if deps.Default.Config.ContainsKey("clients.corge-http.defaultHeaders") {
deps.Default.Config.MustGetStruct("clients.corge-http.defaultHeaders", &defaultHeaders)
}
var requestUUIDHeaderKey string
if deps.Default.Config.ContainsKey("http.clients.requestUUIDHeaderKey") {
requestUUIDHeaderKey = deps.Default.Config.MustGetString("http.clients.requestUUIDHeaderKey")
}
circuitBreakerDisabled := configureCicruitBreaker(deps, timeoutVal)
return &corgeHTTPClient{
clientID: "corge-http",
callerHeader: callerHeader,
calleeHeader: calleeHeader,
callerName: callerName,
calleeName: calleeName,
httpClient: zanzibar.NewHTTPClientContext(
deps.Default.Logger, deps.Default.ContextMetrics,
"corge-http",
map[string]string{
"EchoString": "Corge::echoString",
},
baseURL,
defaultHeaders,
timeout,
),
circuitBreakerDisabled: circuitBreakerDisabled,
requestUUIDHeaderKey: requestUUIDHeaderKey,
}
}
func configureCicruitBreaker(deps *module.Dependencies, timeoutVal int) bool {
// circuitBreakerDisabled sets whether circuit-breaker should be disabled
circuitBreakerDisabled := false
if deps.Default.Config.ContainsKey("clients.corge-http.circuitBreakerDisabled") {
circuitBreakerDisabled = deps.Default.Config.MustGetBoolean("clients.corge-http.circuitBreakerDisabled")
}
// sleepWindowInMilliseconds sets the amount of time, after tripping the circuit,
// to reject requests before allowing attempts again to determine if the circuit should again be closed
sleepWindowInMilliseconds := 5000
if deps.Default.Config.ContainsKey("clients.corge-http.sleepWindowInMilliseconds") {
sleepWindowInMilliseconds = int(deps.Default.Config.MustGetInt("clients.corge-http.sleepWindowInMilliseconds"))
}
// maxConcurrentRequests sets how many requests can be run at the same time, beyond which requests are rejected
maxConcurrentRequests := 20
if deps.Default.Config.ContainsKey("clients.corge-http.maxConcurrentRequests") {
maxConcurrentRequests = int(deps.Default.Config.MustGetInt("clients.corge-http.maxConcurrentRequests"))
}
// errorPercentThreshold sets the error percentage at or above which the circuit should trip open
errorPercentThreshold := 20
if deps.Default.Config.ContainsKey("clients.corge-http.errorPercentThreshold") {
errorPercentThreshold = int(deps.Default.Config.MustGetInt("clients.corge-http.errorPercentThreshold"))
}
// requestVolumeThreshold sets a minimum number of requests that will trip the circuit in a rolling window of 10s
// For example, if the value is 20, then if only 19 requests are received in the rolling window of 10 seconds
// the circuit will not trip open even if all 19 failed.
requestVolumeThreshold := 20
if deps.Default.Config.ContainsKey("clients.corge-http.requestVolumeThreshold") {
requestVolumeThreshold = int(deps.Default.Config.MustGetInt("clients.corge-http.requestVolumeThreshold"))
}
if !circuitBreakerDisabled {
hystrix.ConfigureCommand("corge-http", hystrix.CommandConfig{
MaxConcurrentRequests: maxConcurrentRequests,
ErrorPercentThreshold: errorPercentThreshold,
SleepWindow: sleepWindowInMilliseconds,
RequestVolumeThreshold: requestVolumeThreshold,
Timeout: timeoutVal,
})
}
return circuitBreakerDisabled
}
// HTTPClient returns the underlying HTTP client, should only be
// used for internal testing.
func (c *corgeHTTPClient) HTTPClient() *zanzibar.HTTPClient {
return c.httpClient
}
// EchoString calls "/echo/string" endpoint.
func (c *corgeHTTPClient) EchoString(
ctx context.Context,
headers map[string]string,
r *clientsCorgeCorge.Corge_EchoString_Args,
) (string, map[string]string, error) {
reqUUID := zanzibar.RequestUUIDFromCtx(ctx)
if reqUUID != "" {
if headers == nil {
headers = make(map[string]string)
}
headers[c.requestUUIDHeaderKey] = reqUUID
}
var defaultRes string
req := zanzibar.NewClientHTTPRequest(ctx, c.clientID, "EchoString", "Corge::echoString", c.httpClient)
headers[c.callerHeader] = c.callerName
headers[c.calleeHeader] = c.calleeName
// Generate full URL.
fullURL := c.httpClient.BaseURL + "/echo" + "/string"
err := req.WriteJSON("POST", fullURL, headers, r)
if err != nil {
return defaultRes, nil, err
}
var res *zanzibar.ClientHTTPResponse
if c.circuitBreakerDisabled {
res, err = req.Do()
} else {
err = hystrix.DoC(ctx, "corge-http", func(ctx context.Context) error {
res, err = req.Do()
return err
}, nil)
}
if err != nil {
return defaultRes, nil, err
}
respHeaders := map[string]string{}
for k := range res.Header {
respHeaders[k] = res.Header.Get(k)
}
res.CheckOKResponse([]int{200})
switch res.StatusCode {
case 200:
var responseBody string
err = res.ReadAndUnmarshalBody(&responseBody)
if err != nil {
return defaultRes, respHeaders, err
}
return responseBody, respHeaders, nil
default:
_, err = res.ReadAll()
if err != nil {
return defaultRes, respHeaders, err
}
}
return defaultRes, respHeaders, &zanzibar.UnexpectedHTTPError{
StatusCode: res.StatusCode,
RawBody: res.GetRawBody(),
}
}