Adding Custom Poolsize for WASM Functions

docs/running-tarmac/configuration.md

@@ -26,6 +26,7 @@ When using Environment Variables, all configurations are prefixed with `APP_`. T
 | `APP_IGNORE_CLIENT_CERT` | `ignore_client_cert` | `string` | When defined will disable Client Cert validation for m-TLS authentication |
 | `APP_WASM_FUNCTION` | `wasm_function` | `string` | Path and Filename of the WASM Function to execute \(Default: `/functions/tarmac.wasm`\) |
 | `APP_WASM_FUNCTION_CONFIG` | `wasm_function_config` | `string` | Path to Service configuration for multi-function services \(Default: `/functions/tarmac.json`\) |
+| `APP_WASM_POOL_SIZE` | `wasm_pool_size` | `int` | Number of WASM function instances to create \(Default: `100`\). Only applicable when `wasm_function` is used. |
 | `APP_ENABLE_PPROF` | `enable_pprof` | `bool` | Enable PProf Collection HTTP end-points |
 | `APP_ENABLE_KVSTORE` | `enable_kvstore` | `bool` | Enable the KV Store |
 | `APP_KVSTORE_TYPE` | `kvstore_type` | `string` | Select KV Store to use (Options: `redis`, `cassandra`, `boltdb`, `in-memory`, `internal`)|

docs/wasm-functions/multi-function-services.md

@@ -17,7 +17,8 @@ The `tarmac.json` file has a simple structure that consists of a single object w
       "name": "my-service",
       "functions": {
         "function1": {
-          "filepath": "/path/to/function1.wasm"
+          "filepath": "/path/to/function1.wasm",
+          "pool_size": 10
         },
         "function2": {
           "filepath": "/path/to/function2.wasm"
@@ -61,7 +62,7 @@ The functions object contains one or more key-value pairs, with each key represe
 Each function object should include the following properties:
 
 - `filepath`: The file path to the .wasm file containing the function code (required).
-- `configuration`: An optional object containing configuration data for the function.
+- `pool_size`: The number of instances of the function to create (optional). Defaults to 100.
 
 #### Routes
 

go.mod

@@ -13,7 +13,7 @@ require (
 	github.com/prometheus/client_golang v1.18.0
 	github.com/sirupsen/logrus v1.9.3
 	github.com/spf13/viper v1.18.2
-	github.com/tarmac-project/wapc-toolkit v0.1.0
+	github.com/tarmac-project/wapc-toolkit v0.1.1
 	github.com/wapc/wapc-go v0.6.2
 )
 

go.sum

@@ -324,6 +324,8 @@ github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8
 github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
 github.com/tarmac-project/wapc-toolkit v0.1.0 h1:GbL3SqbgD0O4aSX2GdxDiu/g1tqNxCR/eQF4wOKtLbQ=
 github.com/tarmac-project/wapc-toolkit v0.1.0/go.mod h1:3u2DX1cOveIKuYVL3hmD9lkFbF2HVVfYTpF6Y17cWBo=
+github.com/tarmac-project/wapc-toolkit v0.1.1 h1:Mp4C8Iv9mHMkCLOzXjmWbjUsVwUp5QO+GmZm0tQU2L0=
+github.com/tarmac-project/wapc-toolkit v0.1.1/go.mod h1:3u2DX1cOveIKuYVL3hmD9lkFbF2HVVfYTpF6Y17cWBo=
 github.com/tetratelabs/wazero v1.5.0 h1:Yz3fZHivfDiZFUXnWMPUoiW7s8tC1sjdBtlJn08qYa0=
 github.com/tetratelabs/wazero v1.5.0/go.mod h1:0U0G41+ochRKoPKCJlh0jMg1CHkyfK8kDqiirMmKY8A=
 github.com/tinylib/msgp v1.1.5/go.mod h1:eQsjooMTnV42mHu917E26IogZ2930nFyBQdofk10Udg=

pkg/app/app.go

@@ -575,6 +575,7 @@
 		err = srv.engine.LoadModule(engine.ModuleConfig{
 			Name:     "default",
 			Filepath: srv.cfg.GetString("wasm_function"),
+			PoolSize: srv.cfg.GetInt("wasm_pool_size"),
 		})
 		if err != nil {
 			return fmt.Errorf("could not load default function path for wasm_function (%s) - %s", srv.cfg.GetString("wasm_function"), err)
@@ -599,6 +600,7 @@
 				err := srv.engine.LoadModule(engine.ModuleConfig{
 					Name:     fName,
 					Filepath: fCfg.Filepath,
+					PoolSize: fCfg.PoolSize,
 				})
 				if err != nil {
 					return fmt.Errorf("could not load function %s from path %s - %s", fName, fCfg.Filepath, err)

pkg/app/server_test.go

@@ -179,7 +179,7 @@ func TestFullService(t *testing.T) {
 			defer srv.Stop()
 
 			// Wait for Server to start
-			time.Sleep(10 * time.Second)
+			time.Sleep(30 * time.Second)
 
 			// Call /logger with POST
 			t.Run("Do a Post on /logger", func(t *testing.T) {
@@ -236,6 +236,7 @@ func TestFullService(t *testing.T) {
 					t.Errorf("Unexpected http status code when making request %d", r.StatusCode)
 				}
 			})
+
 		})
 	}
 }

pkg/config/config.go

@@ -39,6 +39,9 @@ type Service struct {
 type Function struct {
 	// Filepath to the WASM function
 	Filepath string `json:"filepath"`
+
+	// PoolSize defines the number of instances of the function to create
+	PoolSize int `json:"pool_size"`
 }
 
 // Route defines available routes for the service.

testdata/tarmac.json

@@ -7,16 +7,19 @@
           "filepath": "/testdata/default/tarmac.wasm"
         },
         "kv": {
-          "filepath": "/testdata/kv/tarmac.wasm"
+          "filepath": "/testdata/kv/tarmac.wasm",
+          "pool_size": 1000
         },
         "logger": {
           "filepath": "/testdata/logger/tarmac.wasm"
         },
         "sql": {
-          "filepath": "/testdata/sql/tarmac.wasm"
+          "filepath": "/testdata/sql/tarmac.wasm",
+          "pool_size": 10
         },
         "func": {
-          "filepath": "/testdata/function/tarmac.wasm"
+          "filepath": "/testdata/function/tarmac.wasm",
+          "pool_size": 1
         }
       },
       "routes": [