Switch extension config file based on languages (#125)

Signed-off-by: Takeshi Yoneda <takeshi@tetrate.io>
tetratelabs · Mar 25, 2021 · 5c46136 · 5c46136
1 parent aef7e79
commit 5c46136
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diff --git a/data/example/init/templates/envoy.access_loggers/default/README.md b/data/example/init/templates/envoy.access_loggers/default/README.md
@@ -6,7 +6,7 @@
 | ----------------- | ------------------------ | ----------------------------------------------------------------------- |
 | `example.yaml`    | `Example` descriptor     | Describes runtime requirements, e.g. a specific version of `Envoy`      |
 | `envoy.tmpl.yaml` | `Envoy` bootstrap config | Provides `Envoy` config that demoes extension in action                 |
-| `extension.json`  | `Extension` config       | Provides configuration for extension itself                             |
+| `${EXTENSION_CONFIG_FILE_NAME}`  | `Extension` config       | Provides configuration for extension itself                             |
 
 ## Components
 

diff --git a/data/example/init/templates/envoy.filters.http/default/README.md b/data/example/init/templates/envoy.filters.http/default/README.md
@@ -6,7 +6,7 @@
 | ----------------- | ------------------------ | ----------------------------------------------------------------------- |
 | `example.yaml`    | `Example` descriptor     | Describes runtime requirements, e.g. a specific version of `Envoy`      |
 | `envoy.tmpl.yaml` | `Envoy` bootstrap config | Provides `Envoy` config that demoes extension in action                 |
-| `extension.json`  | `Extension` config       | Provides configuration for extension itself                             |
+| `${EXTENSION_CONFIG_FILE_NAME}`  | `Extension` config       | Provides configuration for extension itself                             |
 
 ## Components
 

diff --git a/data/example/init/templates/envoy.filters.http/default/extension.json b/data/example/init/templates/envoy.filters.http/default/extension.json
diff --git a/data/example/init/templates/envoy.filters.network/default/README.md b/data/example/init/templates/envoy.filters.network/default/README.md
@@ -6,7 +6,7 @@
 | ----------------- | ------------------------ | ----------------------------------------------------------------------- |
 | `example.yaml`    | `Example` descriptor     | Describes runtime requirements, e.g. a specific version of `Envoy`      |
 | `envoy.tmpl.yaml` | `Envoy` bootstrap config | Provides `Envoy` config that demoes extension in action                 |
-| `extension.json`  | `Extension` config       | Provides configuration for extension itself                             |
+| `${EXTENSION_CONFIG_FILE_NAME}`  | `Extension` config       | Provides configuration for extension itself                             |
 
 ## Components
 

diff --git a/data/example/init/templates/envoy.filters.network/default/extension.json b/data/example/init/templates/envoy.filters.network/default/extension.json
diff --git a/...voy.access_loggers/default/extension.json → ...tes/language-specific/rust/extension.json b/...voy.access_loggers/default/extension.json → ...tes/language-specific/rust/extension.json
diff --git a/data/example/init/templates/language-specific/tinygo/extension.txt b/data/example/init/templates/language-specific/tinygo/extension.txt
@@ -0,0 +1,3 @@
+# We recommend to use json as the configuration format,
+# however, some languages (e.g. TinyGo) does not support ready-to-use json library as of now.
+# As a temporary alternative, we use ".txt" format.
diff --git a/data/extension/init/templates/tinygo/envoy.access_loggers/default/go.mod b/data/extension/init/templates/tinygo/envoy.access_loggers/default/go.mod
@@ -4,5 +4,5 @@ go 1.15
 
 require (
 	github.com/stretchr/testify v1.6.1
-	github.com/tetratelabs/proxy-wasm-go-sdk v0.1.0
+	github.com/tetratelabs/proxy-wasm-go-sdk v0.1.1
 )
diff --git a/data/extension/init/templates/tinygo/envoy.access_loggers/default/go.sum b/data/extension/init/templates/tinygo/envoy.access_loggers/default/go.sum
@@ -5,8 +5,8 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/tetratelabs/proxy-wasm-go-sdk v0.1.0 h1:9CUaOB8CZInfG/VRCjOEOkzS4JLkri/weqogwmrl2a0=
-github.com/tetratelabs/proxy-wasm-go-sdk v0.1.0/go.mod h1:y1ZQT4bQEBnR8Do4nSOzb3roczzPvcAp8UrF6NEYWNY=
+github.com/tetratelabs/proxy-wasm-go-sdk v0.1.1 h1:m8O4nWCyb+8VlAxVxppobGNnC1N9CoAQBmMfRjTq/hU=
+github.com/tetratelabs/proxy-wasm-go-sdk v0.1.1/go.mod h1:y1ZQT4bQEBnR8Do4nSOzb3roczzPvcAp8UrF6NEYWNY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=

diff --git a/data/extension/init/templates/tinygo/envoy.access_loggers/default/main.go b/data/extension/init/templates/tinygo/envoy.access_loggers/default/main.go
@@ -1,6 +1,10 @@
 package main
 
 import (
+	"bufio"
+	"bytes"
+	"strings"
+
 	"github.com/tetratelabs/proxy-wasm-go-sdk/proxywasm"
 	"github.com/tetratelabs/proxy-wasm-go-sdk/proxywasm/types"
 )
@@ -28,7 +32,20 @@ func (l *accessLogger) OnPluginStart(configurationSize int) types.OnPluginStartS
 		proxywasm.LogCriticalf("failed to load config: %v", err)
 		return types.OnPluginStartStatusFailed
 	}
-	l.logMessage = string(data)
+
+	// Ignore comment lines starting with "#" in the configuration.
+	// Note that we recommend to use json as the configuration format,
+	// however, some languages (e.g. TinyGo) does not support ready-to-use json library as of now.
+	// As a temporary alternative, we use ".txt" format for the plugin configuration.
+	var lines []string
+	scanner := bufio.NewScanner(bytes.NewReader(data))
+	for scanner.Scan() {
+		line := scanner.Text()
+		if !strings.HasPrefix(line, "#") {
+			lines = append(lines, line)
+		}
+	}
+	l.logMessage = strings.Join(lines, "\n")
 	return types.OnPluginStartStatusOK
 }
 

diff --git a/data/extension/init/templates/tinygo/envoy.access_loggers/default/main_test.go b/data/extension/init/templates/tinygo/envoy.access_loggers/default/main_test.go
@@ -10,7 +10,8 @@ import (
 )
 
 func TestAccessLogger_OnLog(t *testing.T) {
-	configuration := `this is my log message`
+	configuration := `# this is comment line, and should be ignored.
+this is my log message`
 	opt := proxytest.NewEmulatorOption().
 		WithNewRootContext(newAccessLogger).
 		WithPluginConfiguration([]byte(configuration))

diff --git a/data/extension/init/templates/tinygo/envoy.filters.http/default/go.mod b/data/extension/init/templates/tinygo/envoy.filters.http/default/go.mod
@@ -4,5 +4,5 @@ go 1.15
 
 require (
 	github.com/stretchr/testify v1.6.1
-	github.com/tetratelabs/proxy-wasm-go-sdk v0.1.0
+	github.com/tetratelabs/proxy-wasm-go-sdk v0.1.1
 )
diff --git a/data/extension/init/templates/tinygo/envoy.filters.http/default/go.sum b/data/extension/init/templates/tinygo/envoy.filters.http/default/go.sum
@@ -5,8 +5,8 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/tetratelabs/proxy-wasm-go-sdk v0.1.0 h1:9CUaOB8CZInfG/VRCjOEOkzS4JLkri/weqogwmrl2a0=
-github.com/tetratelabs/proxy-wasm-go-sdk v0.1.0/go.mod h1:y1ZQT4bQEBnR8Do4nSOzb3roczzPvcAp8UrF6NEYWNY=
+github.com/tetratelabs/proxy-wasm-go-sdk v0.1.1 h1:m8O4nWCyb+8VlAxVxppobGNnC1N9CoAQBmMfRjTq/hU=
+github.com/tetratelabs/proxy-wasm-go-sdk v0.1.1/go.mod h1:y1ZQT4bQEBnR8Do4nSOzb3roczzPvcAp8UrF6NEYWNY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=

diff --git a/data/extension/init/templates/tinygo/envoy.filters.http/default/main.go b/data/extension/init/templates/tinygo/envoy.filters.http/default/main.go
@@ -42,11 +42,21 @@ func (ctx *rootContext) OnPluginStart(configurationSize int) types.OnPluginStart
 		return types.OnPluginStartStatusFailed
 	}
 
-	// Each line in the configuration is in the "KEY=VALUE" format.
+	// Read the configuration.
+	// Note that we recommend to use json as the configuration format,
+	// however, some languages (e.g. TinyGo) does not support ready-to-use json library as of now.
+	// As a temporary alternative, we use ".txt" format for the plugin configuration.
 	scanner := bufio.NewScanner(bytes.NewReader(data))
 	for scanner.Scan() {
-		tokens := strings.Split(scanner.Text(), "=")
-		ctx.additionalHeaders[tokens[0]] = tokens[1]
+		// Ignore comment lines starting with "#".
+		line := scanner.Text()
+		if strings.HasPrefix(line, "#") {
+			continue
+		}
+		// Each line in the configuration is in the "KEY=VALUE" format.
+		if tokens := strings.Split(scanner.Text(), "="); len(tokens) == 2 {
+			ctx.additionalHeaders[tokens[0]] = tokens[1]
+		}
 	}
 	return types.OnPluginStartStatusOK
 }

diff --git a/data/extension/init/templates/tinygo/envoy.filters.http/default/main_test.go b/data/extension/init/templates/tinygo/envoy.filters.http/default/main_test.go
@@ -10,7 +10,8 @@ import (
 )
 
 func TestHttpFilter_OnHttpRequestHeaders(t *testing.T) {
-	configuration := `HELLO=WORLD
+	configuration := `# this is comment line, and should be ignored.
+HELLO=WORLD
 ENVOY=ISTIO`
 	opt := proxytest.NewEmulatorOption().
 		WithNewRootContext(newRootContext).

diff --git a/data/extension/init/templates/tinygo/envoy.filters.network/default/go.mod b/data/extension/init/templates/tinygo/envoy.filters.network/default/go.mod
@@ -4,5 +4,5 @@ go 1.15
 
 require (
 	github.com/stretchr/testify v1.6.1
-	github.com/tetratelabs/proxy-wasm-go-sdk v0.1.0
+	github.com/tetratelabs/proxy-wasm-go-sdk v0.1.1
 )
diff --git a/data/extension/init/templates/tinygo/envoy.filters.network/default/go.sum b/data/extension/init/templates/tinygo/envoy.filters.network/default/go.sum
@@ -5,8 +5,8 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/tetratelabs/proxy-wasm-go-sdk v0.1.0 h1:9CUaOB8CZInfG/VRCjOEOkzS4JLkri/weqogwmrl2a0=
-github.com/tetratelabs/proxy-wasm-go-sdk v0.1.0/go.mod h1:y1ZQT4bQEBnR8Do4nSOzb3roczzPvcAp8UrF6NEYWNY=
+github.com/tetratelabs/proxy-wasm-go-sdk v0.1.1 h1:m8O4nWCyb+8VlAxVxppobGNnC1N9CoAQBmMfRjTq/hU=
+github.com/tetratelabs/proxy-wasm-go-sdk v0.1.1/go.mod h1:y1ZQT4bQEBnR8Do4nSOzb3roczzPvcAp8UrF6NEYWNY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=

diff --git a/data/extension/init/templates/tinygo/envoy.filters.network/default/main.go b/data/extension/init/templates/tinygo/envoy.filters.network/default/main.go
@@ -1,6 +1,10 @@
 package main
 
 import (
+	"bufio"
+	"bytes"
+	"strings"
+
 	"github.com/tetratelabs/proxy-wasm-go-sdk/proxywasm"
 	"github.com/tetratelabs/proxy-wasm-go-sdk/proxywasm/types"
 )
@@ -34,7 +38,20 @@ func (ctx *rootContext) OnPluginStart(configurationSize int) types.OnPluginStart
 		proxywasm.LogCriticalf("failed to load config: %v", err)
 		return types.OnPluginStartStatusFailed
 	}
-	ctx.config = string(data)
+
+	// Ignore comment lines starting with "#" in the extension.txt.
+	// Note that we recommend to use json as the configuration format,
+	// however, some languages (e.g. TinyGo) does not support ready-to-use json library as of now.
+	// As a temporary alternative, we use ".txt" format for the plugin configuration.
+	var lines []string
+	scanner := bufio.NewScanner(bytes.NewReader(data))
+	for scanner.Scan() {
+		line := scanner.Text()
+		if !strings.HasPrefix(line, "#") {
+			lines = append(lines, line)
+		}
+	}
+	ctx.config = strings.Join(lines, "\n")
 	return types.OnPluginStartStatusOK
 }
 

diff --git a/data/extension/init/templates/tinygo/envoy.filters.network/default/main_test.go b/data/extension/init/templates/tinygo/envoy.filters.network/default/main_test.go
@@ -9,7 +9,8 @@ import (
 )
 
 func TestNetworkFilter_OnNewConnection(t *testing.T) {
-	configuration := `message: this is new connection!`
+	configuration := `# this is comment line, and should be ignored.
+message: this is new connection!`
 	opt := proxytest.NewEmulatorOption().
 		WithPluginConfiguration([]byte(configuration)).
 		WithNewRootContext(newRootContext)
@@ -28,7 +29,7 @@ func TestNetworkFilter_OnNewConnection(t *testing.T) {
 
 	// Retrieve logs emitted to Envoy.
 	logs := host.GetLogs(types.LogLevelInfo)
-	require.Contains(t, logs, configuration)
+	require.Contains(t, logs, "message: this is new connection!")
 }
 
 func TestNetworkFilter_counter(t *testing.T) {

diff --git a/pkg/cmd/extension/example/cmd_add_test.go b/pkg/cmd/extension/example/cmd_add_test.go
@@ -131,10 +131,17 @@ Run 'getenvoy extension examples add --help' for usage.
 Done!
 `))
 			By("verifying file system")
-			Expect(filepath.Join(tempDir, ".getenvoy/extension/examples/default/README.md")).To(BeAnExistingFile())
+			readmePath := filepath.Join(tempDir, ".getenvoy/extension/examples/default/README.md")
+			Expect(readmePath).To(BeAnExistingFile())
 			Expect(filepath.Join(tempDir, ".getenvoy/extension/examples/default/envoy.tmpl.yaml")).To(BeAnExistingFile())
 			Expect(filepath.Join(tempDir, ".getenvoy/extension/examples/default/example.yaml")).To(BeAnExistingFile())
 			Expect(filepath.Join(tempDir, ".getenvoy/extension/examples/default/extension.json")).To(BeAnExistingFile())
+			// Check README substitution: ${EXTENSION_CONFIG_FILE_NAME} must be replaced with "extension.json".
+			data, err := ioutil.ReadFile(readmePath)
+			Expect(err).ToNot(HaveOccurred())
+			readme := string(data)
+			Expect(readme).To(ContainSubstring("extension.json"))
+			Expect(readme).NotTo(ContainSubstring("EXTENSION_CONFIG_FILE_NAME"))
 		})
 
 		It("should create example setup with a given --name", func() {
@@ -160,10 +167,17 @@ Done!
 Done!
 `))
 			By("verifying file system")
-			Expect(filepath.Join(tempDir, ".getenvoy/extension/examples/advanced/README.md")).To(BeAnExistingFile())
+			readmePath := filepath.Join(tempDir, ".getenvoy/extension/examples/advanced/README.md")
+			Expect(readmePath).To(BeAnExistingFile())
 			Expect(filepath.Join(tempDir, ".getenvoy/extension/examples/advanced/envoy.tmpl.yaml")).To(BeAnExistingFile())
 			Expect(filepath.Join(tempDir, ".getenvoy/extension/examples/advanced/example.yaml")).To(BeAnExistingFile())
 			Expect(filepath.Join(tempDir, ".getenvoy/extension/examples/advanced/extension.json")).To(BeAnExistingFile())
+			// Check README substitution: ${EXTENSION_CONFIG_FILE_NAME} must be replaced with "extension.json".
+			data, err := ioutil.ReadFile(readmePath)
+			Expect(err).ToNot(HaveOccurred())
+			readme := string(data)
+			Expect(readme).To(ContainSubstring("extension.json"))
+			Expect(readme).NotTo(ContainSubstring("${EXTENSION_CONFIG_FILE_NAME}"))
 		})
 
 		It("should fail if such example already exists", func() {
@@ -186,6 +200,42 @@ Done!
 Run 'getenvoy extension examples add --help' for usage.
 `))
 		})
+
+		It("should create 'default' example setup when no --name is omitted for TinyGo", func() {
+			By("simulating a workspace without any examples")
+			err := copy.Copy("testdata/workspace4", tempDir)
+			Expect(err).NotTo(HaveOccurred())
+
+			By("changing to a workspace dir")
+			chdir(tempDir)
+
+			By("running command")
+			c.SetArgs([]string{"extension", "examples", "add"})
+			err = cmdutil.Execute(c)
+			Expect(err).ToNot(HaveOccurred())
+
+			By("verifying command output")
+			Expect(stdout.String()).To(BeEmpty())
+			Expect(stderr.String()).To(Equal(`Scaffolding a new example setup:
+* .getenvoy/extension/examples/default/README.md
+* .getenvoy/extension/examples/default/envoy.tmpl.yaml
+* .getenvoy/extension/examples/default/example.yaml
+* .getenvoy/extension/examples/default/extension.txt
+Done!
+`))
+			By("verifying file system")
+			readmePath := filepath.Join(tempDir, ".getenvoy/extension/examples/default/README.md")
+			Expect(readmePath).To(BeAnExistingFile())
+			Expect(filepath.Join(tempDir, ".getenvoy/extension/examples/default/envoy.tmpl.yaml")).To(BeAnExistingFile())
+			Expect(filepath.Join(tempDir, ".getenvoy/extension/examples/default/example.yaml")).To(BeAnExistingFile())
+			Expect(filepath.Join(tempDir, ".getenvoy/extension/examples/default/extension.txt")).To(BeAnExistingFile())
+			// Check README substitution: ${EXTENSION_CONFIG_FILE_NAME} must be replaced with "extension.txt".
+			data, err := ioutil.ReadFile(readmePath)
+			Expect(err).ToNot(HaveOccurred())
+			readme := string(data)
+			Expect(readme).To(ContainSubstring("extension.txt"))
+			Expect(readme).NotTo(ContainSubstring("${EXTENSION_CONFIG_FILE_NAME}"))
+		})
 	})
 
 	Context("outside of a workspace directory", func() {

diff --git a/pkg/cmd/extension/example/testdata/workspace4/.getenvoy/extension/extension.yaml b/pkg/cmd/extension/example/testdata/workspace4/.getenvoy/extension/extension.yaml
@@ -0,0 +1,14 @@
+#
+# Envoy Wasm extension created with getenvoy toolkit.
+#
+kind: Extension
+
+name: me.filters.http.my_http_filter
+
+category: envoy.filters.http
+language: tinygo
+
+# Runtime the extension is being developed against.
+runtime:
+  envoy:
+    version: standard:1.17.0
diff --git a/pkg/cmd/extension/run/cmd_test.go b/pkg/cmd/extension/run/cmd_test.go
@@ -700,6 +700,43 @@ Run 'getenvoy extension run --help' for usage.
 Done!
 docker stderr
 envoy stderr
+`))
+
+			By("verifying Envoy config")
+			bootstrap := envoyCaptured.readFileToJSON("envoy.tmpl.yaml")
+			Expect(bootstrap).NotTo(BeEmpty())
+		})
+
+		It("should create default example if missing for TinyGo", func() {
+			By("simulating a workspace without 'default' example")
+			tempDir, err := ioutil.TempDir("", "")
+			Expect(err).NotTo(HaveOccurred())
+			defer func() {
+				Expect(os.RemoveAll(tempDir)).To(Succeed())
+			}()
+			err = copy.Copy("testdata/workspace_tinygo", tempDir)
+			Expect(err).NotTo(HaveOccurred())
+
+			By("changing to a workspace dir")
+			workspaceDir := chdir(tempDir)
+
+			By("running command")
+			c.SetArgs([]string{"extension", "run"})
+			err = cmdutil.Execute(c)
+			Expect(err).ToNot(HaveOccurred())
+
+			By("verifying command output")
+			Expect(stdout.String()).To(Equal(fmt.Sprintf(`%s/docker run -u 1001:1002 --rm -t -v %s:/source -w /source --init getenvoy/extension-tinygo-builder:latest build --output-file build/extension.wasm
+%s/builds/standard/1.17.0/%s/bin/envoy -c %s/envoy.tmpl.yaml
+`, dockerDir, workspaceDir, getenvoyHomeDir, platform, envoyCaptured.cwd())))
+			Expect(stderr.String()).To(Equal(`Scaffolding a new example setup:
+* .getenvoy/extension/examples/default/README.md
+* .getenvoy/extension/examples/default/envoy.tmpl.yaml
+* .getenvoy/extension/examples/default/example.yaml
+* .getenvoy/extension/examples/default/extension.txt
+Done!
+docker stderr
+envoy stderr
 `))
 
 			By("verifying Envoy config")

diff --git a/pkg/cmd/extension/run/testdata/workspace_tinygo/.getenvoy/extension/extension.yaml b/pkg/cmd/extension/run/testdata/workspace_tinygo/.getenvoy/extension/extension.yaml
@@ -0,0 +1,14 @@
+#
+# Envoy Wasm extension created with getenvoy toolkit.
+#
+kind: Extension
+
+name: mycompany.filters.http.mytest
+
+category: envoy.filters.http
+language: tinygo
+
+# Runtime the extension is being developed against.
+runtime:
+  envoy:
+    version: standard:1.17.0
diff --git a/pkg/extension/example/init/registry/global.go b/pkg/extension/example/init/registry/global.go
@@ -35,7 +35,7 @@ func globalRegistry() registry {
 }
 
 // Get returns an example template registered in a global registry for a given
-// extension category and name.
-func Get(category extension.Category, name string) (*Entry, error) {
-	return globalRegistry().Get(category, name)
+// extension category, name and language.
+func Get(descriptor *extension.Descriptor, name string) (*Entry, error) {
+	return globalRegistry().Get(descriptor, name)
 }