mirror of
https://github.com/alibaba/higress.git
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71 lines
2.0 KiB
Go
71 lines
2.0 KiB
Go
// Copyright (c) 2022 Alibaba Group Holding Ltd.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"errors"
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"fmt"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
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"github.com/tidwall/gjson"
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"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
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)
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func main() {
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wrapper.SetCtx(
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"custom-span-attribute",
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wrapper.ParseConfigBy(parseConfig),
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wrapper.ProcessRequestHeadersBy(onHttpRequestHeaders),
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)
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}
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type CustomSpanAttributeConfig struct {
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HeaderKey string
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}
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func setSpanAttribute(key string, value interface{}, log wrapper.Log) {
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if value != "" {
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traceSpanTag := wrapper.TraceSpanTagPrefix + key
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if e := proxywasm.SetProperty([]string{traceSpanTag}, []byte(fmt.Sprint(value))); e != nil {
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log.Warnf("failed to set %s in filter state: %v", traceSpanTag, e)
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}
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} else {
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log.Debugf("failed to write span attribute [%s], because it's value is empty")
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}
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}
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/*
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Example configuration:
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```yaml
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headerKey: foo
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```
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*/
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func parseConfig(configJson gjson.Result, config *CustomSpanAttributeConfig, log wrapper.Log) error {
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config.HeaderKey = configJson.Get("headerKey").String()
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if config.HeaderKey == "" {
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return errors.New("no header key specified")
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}
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return nil
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}
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func onHttpRequestHeaders(ctx wrapper.HttpContext, config CustomSpanAttributeConfig, log wrapper.Log) types.Action {
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headerValue, _ := proxywasm.GetHttpRequestHeader(config.HeaderKey)
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setSpanAttribute(config.HeaderKey, headerValue, log)
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return types.ActionContinue
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}
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