Wasm VM failed Failed to initialize Wasm code

[swapnilaniljanorkarjanorkar-sap]

I'm trying to run the wasm plugin in envoy but getting following error while running.

[2024-04-15 10:47:48.818][1][error][wasm] [source/extensions/common/wasm/wasm_vm.cc:39] Failed to load Wasm module due to a missing import: wasi_snapshot_preview1.sched_yield
[2024-04-15 10:47:48.818][1][error][wasm] [source/extensions/common/wasm/wasm.cc:118] Wasm VM failed Failed to initialize Wasm code
[2024-04-15 10:47:48.819][1][critical][wasm] [source/extensions/common/wasm/wasm.cc:472] Plugin configured to fail closed failed to load
[2024-04-15 10:47:48.821][1][critical][main] [source/server/server.cc:113] error initializing configuration '/etc/envoy/envoy.yaml': Unable to create Wasm HTTP filter 
[2024-04-15 10:47:48.822][1][info][main] [source/server/server.cc:815] exiting
Unable to create Wasm HTTP filter 
make: *** [run] Error 1

• Build Command:

  tinygo build -o istio-plugin.wasm -gc=custom -tags=custommalloc -scheduler=none -target=wasi main.go

• Envoy Config:

  http_filters:
                - name: envoy.filters.http.wasm
                  typed_config:
                    "@type": type.googleapis.com/udpa.type.v1.TypedStruct
                    type_url: type.googleapis.com/envoy.extensions.filters.http.wasm.v3.Wasm
                    value:
                      config:
                        configuration:
                          "@type": type.googleapis.com/google.protobuf.StringValue
                          value: |
                            {
                              "header": "appname",
                              "value": "aicore!b32291"
                            }
                        vm_config:
                          runtime: "envoy.wasm.runtime.v8"
                          code:
                            local:
                              filename: "/etc/envoy/istio-tenant-id-plugin.wasm"
                - name: envoy.filters.http.router
                  typed_config:
                    "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router

As mentioned in the README file, I have added "github.com/wasilibs/nottinygc" in import statements.

• Import Statements:

  import (
  "strings"
  
  _ "github.com/wasilibs/nottinygc"
  
  b64 "encoding/base64"
  
  "github.com/tetratelabs/proxy-wasm-go-sdk/proxywasm"
  "github.com/tetratelabs/proxy-wasm-go-sdk/proxywasm/types"
  "github.com/tidwall/gjson"
  )

[anuraaga]

Hi @swapnilaniljanorkarjanorkar-sap - did you add the build tag too?

https://github.com/wasilibs/nottinygc?tab=readme-ov-file#using-with-envoy

[swapnilaniljanorkarjanorkar-sap]

Hi @swapnilaniljanorkarjanorkar-sap - did you add the build tag too?

https://github.com/wasilibs/nottinygc?tab=readme-ov-file#using-with-envoy

Hi @anuraaga After adding both the tags (custommalloc and nottinygc_envoy) I could build the wasm plugin.

tinygo build -o plugin.wasm -gc=custom -tags="custommalloc nottinygc_envoy" -scheduler=none -target=wasi main.go

[anuraaga]

Sounds like it worked, thanks for confirming