Add metadata block to the agent (#112)

Author: ammario

docs/resources/agent.md

@@ -51,6 +51,7 @@ resource "kubernetes_pod" "dev" {
 - `dir` (String) The starting directory when a user creates a shell session. Defaults to $HOME.
 - `env` (Map of String) A mapping of environment variables to set inside the workspace.
 - `login_before_ready` (Boolean) This option defines whether or not the user can (by default) login to the workspace before it is ready. Ready means that e.g. the startup_script is done and has exited. When enabled, users may see an incomplete workspace when logging in.
+- `metadata` (Block List) Each "metadata" block defines a single item consisting of a key/value pair. This feature is in alpha and may break in future releases. (see [below for nested schema](#nestedblock--metadata))
 - `motd_file` (String) The path to a file within the workspace containing a message to display to users when they login via SSH. A typical value would be /etc/motd.
 - `shutdown_script` (String) A script to run before the agent is stopped. The script should exit when it is done to signal that the workspace can be stopped.
 - `shutdown_script_timeout` (Number) Time in seconds until the agent lifecycle status is marked as timed out during shutdown, this happens when the shutdown script has not completed (exited) in the given time.
@@ -64,4 +65,18 @@ resource "kubernetes_pod" "dev" {
 - `init_script` (String) Run this script on startup of an instance to initialize the agent.
 - `token` (String, Sensitive) Set the environment variable "CODER_AGENT_TOKEN" with this token to authenticate an agent.
 
+<a id="nestedblock--metadata"></a>
+### Nested Schema for `metadata`
+
+Required:
+
+- `interval` (Number) The interval in seconds at which to refresh this metadata item.
+- `key` (String) The key of this metadata item.
+- `script` (String) The script that retrieves the value of this metadata item.
+
+Optional:
+
+- `display_name` (String) The user-facing name of this value.
+- `timeout` (Number) The maximum time the command is allowed to run in seconds.
+
 

provider/agent.go

@@ -137,6 +137,49 @@ func agentResource() *schema.Resource {
 				Optional:    true,
 				Description: "This option defines whether or not the user can (by default) login to the workspace before it is ready. Ready means that e.g. the startup_script is done and has exited. When enabled, users may see an incomplete workspace when logging in.",
 			},
+			"metadata": {
+				Type:        schema.TypeList,
+				Description: "Each \"metadata\" block defines a single item consisting of a key/value pair. This feature is in alpha and may break in future releases.",
+				ForceNew:    true,
+				Optional:    true,
+				Elem: &schema.Resource{
+					Schema: map[string]*schema.Schema{
+						"key": {
+							Type:        schema.TypeString,
+							Description: "The key of this metadata item.",
+							ForceNew:    true,
+							Required:    true,
+						},
+						"display_name": {
+							Type:        schema.TypeString,
+							Description: "The user-facing name of this value.",
+							ForceNew:    true,
+							Optional:    true,
+						},
+						"script": {
+							Type:        schema.TypeString,
+							Description: "The script that retrieves the value of this metadata item.",
+							ForceNew:    true,
+							Required:    true,
+							Elem: &schema.Schema{
+								Type: schema.TypeString,
+							},
+						},
+						"timeout": {
+							Type:        schema.TypeInt,
+							Description: "The maximum time the command is allowed to run in seconds.",
+							ForceNew:    true,
+							Optional:    true,
+						},
+						"interval": {
+							Type:        schema.TypeInt,
+							Description: "The interval in seconds at which to refresh this metadata item. ",
+							ForceNew:    true,
+							Required:    true,
+						},
+					},
+				},
+			},
 		},
 	}
 }

provider/agent_test.go

@@ -71,7 +71,7 @@ func TestAgent(t *testing.T) {
 	})
 }
 
-func TestAgentInstance(t *testing.T) {
+func TestAgent_Instance(t *testing.T) {
 	t.Parallel()
 	resource.Test(t, resource.TestCase{
 		Providers: map[string]*schema.Provider{
@@ -111,3 +111,49 @@ func TestAgentInstance(t *testing.T) {
 		}},
 	})
 }
+
+func TestAgent_Metadata(t *testing.T) {
+	t.Parallel()
+	resource.Test(t, resource.TestCase{
+		Providers: map[string]*schema.Provider{
+			"coder": provider.New(),
+		},
+		IsUnitTest: true,
+		Steps: []resource.TestStep{{
+			Config: `
+				provider "coder" {
+					url = "https://example.com"
+				}
+				resource "coder_agent" "dev" {
+					os = "linux"
+					arch = "amd64"
+					metadata {
+						key = "process_count"
+						display_name = "Process Count"
+						script = "ps aux | wc -l"
+						interval = 5
+						timeout = 1
+					}
+				}
+				`,
+			Check: func(state *terraform.State) error {
+				require.Len(t, state.Modules, 1)
+				require.Len(t, state.Modules[0].Resources, 1)
+
+				resource := state.Modules[0].Resources["coder_agent.dev"]
+				require.NotNil(t, resource)
+
+				t.Logf("resource: %v", resource.Primary.Attributes)
+
+				attr := resource.Primary.Attributes
+				require.Equal(t, "1", attr["metadata.#"])
+				require.Equal(t, "process_count", attr["metadata.0.key"])
+				require.Equal(t, "Process Count", attr["metadata.0.display_name"])
+				require.Equal(t, "ps aux | wc -l", attr["metadata.0.script"])
+				require.Equal(t, "5", attr["metadata.0.interval"])
+				require.Equal(t, "1", attr["metadata.0.timeout"])
+				return nil
+			},
+		}},
+	})
+}