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add inject_encoded_data_to_filter_chain_on_header example (#3071)
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rinfx
GitHub
26
plugins/wasm-go/examples/test-foreign-function/README.md
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26
plugins/wasm-go/examples/test-foreign-function/README.md
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## 功能说明
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此插件示例用于展示在无响应body情况下如何添加body数据。
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**注意**
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1. 原始响应不能够有body，如果有原始的响应body，会造成网关crash
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2. header阶段需返回`types.ActionPause`
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3. `Endstream`必须设置为`true`
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示例中 `inject_encoded_data_to_filter_chain_on_header` 该函数是异步调用，需要保证调用时流不被销毁，有body或者header阶段不返回`types.ActionPause`都可能导致流被提前销毁。
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一份无响应body的flask代码示例：
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```python
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import os
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from flask import Flask, request, Response
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app = Flask(__name__)
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@app.route('/test', methods=['GET', 'POST'])
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def print_request():
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return Response(status=200)
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if __name__ == '__main__':
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app.run("0.0.0.0", 5000, debug=False)
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```
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20
plugins/wasm-go/examples/test-foreign-function/go.mod
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20
plugins/wasm-go/examples/test-foreign-function/go.mod
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module github.com/alibaba/higress/plugins/wasm-go/extensions/test-foreign-function
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go 1.24.1
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toolchain go1.24.3
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require (
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github.com/higress-group/proxy-wasm-go-sdk v0.0.0-20250822030947-8345453fddd0
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github.com/higress-group/wasm-go v1.0.3-0.20251011083635-792cb1547bac
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github.com/tidwall/gjson v1.18.0
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google.golang.org/protobuf v1.36.6
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)
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require (
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github.com/google/uuid v1.6.0 // indirect
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github.com/tidwall/match v1.1.1 // indirect
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github.com/tidwall/pretty v1.2.1 // indirect
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github.com/tidwall/resp v0.1.1 // indirect
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github.com/tidwall/sjson v1.2.5 // indirect
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)
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32
plugins/wasm-go/examples/test-foreign-function/go.sum
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32
plugins/wasm-go/examples/test-foreign-function/go.sum
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github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
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github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
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github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
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github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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github.com/higress-group/proxy-wasm-go-sdk v0.0.0-20250822030947-8345453fddd0 h1:YGdj8KBzVjabU3STUfwMZghB+VlX6YLfJtLbrsWaOD0=
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github.com/higress-group/proxy-wasm-go-sdk v0.0.0-20250822030947-8345453fddd0/go.mod h1:tRI2LfMudSkKHhyv1uex3BWzcice2s/l8Ah8axporfA=
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github.com/higress-group/wasm-go v1.0.3-0.20251011083635-792cb1547bac h1:tdJzS56Xa6BSHAi9P2omvb98bpI8qFGg6jnCPtPmDgA=
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github.com/higress-group/wasm-go v1.0.3-0.20251011083635-792cb1547bac/go.mod h1:B8C6+OlpnyYyZUBEdUXA7tYZYD+uwZTNjfkE5FywA+A=
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github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
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github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
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github.com/tidwall/gjson v1.14.2/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
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github.com/tidwall/gjson v1.18.0 h1:FIDeeyB800efLX89e5a8Y0BNH+LOngJyGrIWxG2FKQY=
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github.com/tidwall/gjson v1.18.0/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
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github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
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github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
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github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
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github.com/tidwall/pretty v1.2.1 h1:qjsOFOWWQl+N3RsoF5/ssm1pHmJJwhjlSbZ51I6wMl4=
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github.com/tidwall/pretty v1.2.1/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
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github.com/tidwall/resp v0.1.1 h1:Ly20wkhqKTmDUPlyM1S7pWo5kk0tDu8OoC/vFArXmwE=
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github.com/tidwall/resp v0.1.1/go.mod h1:3/FrruOBAxPTPtundW0VXgmsQ4ZBA0Aw714lVYgwFa0=
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github.com/tidwall/sjson v1.2.5 h1:kLy8mja+1c9jlljvWTlSazM7cKDRfJuR/bOJhcY5NcY=
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github.com/tidwall/sjson v1.2.5/go.mod h1:Fvgq9kS/6ociJEDnK0Fk1cpYF4FIW6ZF7LAe+6jwd28=
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golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
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golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
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google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
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gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
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gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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43
plugins/wasm-go/examples/test-foreign-function/main.go
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43
plugins/wasm-go/examples/test-foreign-function/main.go
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package main
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import (
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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/higress-group/wasm-go/pkg/log"
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pb "github.com/higress-group/wasm-go/pkg/protos"
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"github.com/higress-group/wasm-go/pkg/wrapper"
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"github.com/tidwall/gjson"
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"google.golang.org/protobuf/proto"
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)
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type TestConfig struct {
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}
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func main() {}
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func init() {
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wrapper.SetCtx(
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"test-foreign-function",
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wrapper.ParseConfig(parseConfig),
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wrapper.ProcessResponseHeaders(onHttpResponseHeaders),
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)
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}
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func parseConfig(configJson gjson.Result, config *TestConfig) error {
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return nil
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}
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func onHttpResponseHeaders(ctx wrapper.HttpContext, config TestConfig) types.Action {
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proxywasm.RemoveHttpResponseHeader("content-length")
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ctx.DontReadResponseBody()
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d := &pb.InjectEncodedDataToFilterChainArguments{
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Body: "hello foreign function\n",
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Endstream: true,
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}
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s, _ := proto.Marshal(d)
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_, err := proxywasm.CallForeignFunction("inject_encoded_data_to_filter_chain_on_header", s)
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if err != nil {
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log.Errorf("call inject_encoded_data_to_filter_chain_on_header failed, error: %+v", err)
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}
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return types.ActionContinue
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}
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