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healthcheck.go
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healthcheck.go
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/*
* Copyright (c) 2017, MegaEase
* All rights reserved.
*
* 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 proxies
import (
"net/http"
"time"
)
// HealthCheckSpec is the spec for health check.
type HealthCheckSpec struct {
// Interval is the interval duration for health check.
Interval string `json:"interval" jsonschema:"omitempty,format=duration"`
// Path is the health check path for server
Path string `json:"path" jsonschema:"omitempty"`
// Timeout is the timeout duration for health check, default is 3.
Timeout string `json:"timeout" jsonschema:"omitempty,format=duration"`
// Fails is the consecutive fails count for assert fail, default is 1.
Fails int `json:"fails" jsonschema:"omitempty,minimum=1"`
// Passes is the consecutive passes count for assert pass, default is 1.
Passes int `json:"passes" jsonschema:"omitempty,minimum=1"`
}
// HealthChecker checks whether a server is healthy or not.
type HealthChecker interface {
Check(svr *Server) bool
Close()
}
// HTTPHealthChecker is a health checker for HTTP protocol.
type HTTPHealthChecker struct {
path string
client *http.Client
}
// NewHTTPHealthChecker creates a new HTTPHealthChecker.
func NewHTTPHealthChecker(spec *HealthCheckSpec) HealthChecker {
timeout, _ := time.ParseDuration(spec.Timeout)
if timeout <= 0 {
timeout = 3 * time.Second
}
return &HTTPHealthChecker{
path: spec.Path,
client: &http.Client{Timeout: timeout},
}
}
// Check checks whether a server is healthy or not.
func (hc *HTTPHealthChecker) Check(svr *Server) bool {
// TODO: should use url.JoinPath?
url := svr.URL + hc.path
resp, err := hc.client.Get(url)
return err == nil && resp.StatusCode < 500
}
// Close closes the health checker
func (hc *HTTPHealthChecker) Close() {
}