feat(agentapi): Add support for running under a subdomain (#297)

Updates https://github.com/coder/coder/issues/18779

A separate PR will update dependant modules `goose` and `aider`.

## Description

* Adds `subdomain` argument to `agentapi` module
* Updates `agentapi` module to set `AGENTAPI_CHAT_BASE_PATH` to an
autogenerated path if `var.subdomain = false`
* Updates default `agentapi` version to `v0.3.3` to support running
without subdomain

## Type of Change

- [ ] New module
- [ ] Bug fix
- [x] Feature/enhancement
- [ ] Documentation
- [ ] Other


## Testing & Validation

- [X] Tests pass (`bun test`)
- [X] Code formatted (`bun run fmt`)
- [x] Changes tested locally

## Related Issues

- https://github.com/coder/coder/issues/18779

registry/coder/modules/agentapi/README.md

@@ -16,7 +16,7 @@ The AgentAPI module is a building block for modules that need to run an AgentAPI
 ```tf
 module "agentapi" {
   source  = "registry.coder.com/coder/agentapi/coder"
-  version = "1.0.2"
+  version = "1.1.0"
 
   agent_id             = var.agent_id
   web_app_slug         = local.app_slug

registry/coder/modules/agentapi/main.test.ts

@@ -148,4 +148,92 @@ describe("agentapi", async () => {
     ]);
     expect(respAgentAPI.exitCode).toBe(0);
   });
+
+  test("no-subdomain-base-path", async () => {
+    const { id } = await setup({
+      moduleVariables: {
+        agentapi_subdomain: "false",
+      },
+    });
+
+    const respModuleScript = await execModuleScript(id);
+    expect(respModuleScript.exitCode).toBe(0);
+
+    await expectAgentAPIStarted(id);
+    const agentApiStartLog = await readFileContainer(
+      id,
+      "/home/coder/test-agentapi-start.log",
+    );
+    expect(agentApiStartLog).toContain("Using AGENTAPI_CHAT_BASE_PATH: /@default/default.foo/apps/agentapi-web/chat");
+  });
+
+  test("validate-agentapi-version", async () => {
+    const cases = [
+      {
+        moduleVariables: {
+          agentapi_version: "v0.3.2",
+        },
+        shouldThrow: "",
+      },
+      {
+        moduleVariables: {
+          agentapi_version: "v0.3.3",
+        },
+        shouldThrow: "",
+      },
+      {
+        moduleVariables: {
+          agentapi_version: "v0.0.1",
+          agentapi_subdomain: "false",
+        },
+        shouldThrow: "Running with subdomain = false is only supported by agentapi >= v0.3.3.",
+      },
+      {
+        moduleVariables: {
+          agentapi_version: "v0.3.2",
+          agentapi_subdomain: "false",
+        },
+        shouldThrow: "Running with subdomain = false is only supported by agentapi >= v0.3.3.",
+      },
+      {
+        moduleVariables: {
+          agentapi_version: "v0.3.3",
+          agentapi_subdomain: "false",
+        },
+        shouldThrow: "",
+      },
+      {
+        moduleVariables: {
+          agentapi_version: "v0.3.999",
+          agentapi_subdomain: "false",
+        },
+        shouldThrow: "",
+      },
+      {
+        moduleVariables: {
+          agentapi_version: "v0.999.999",
+          agentapi_subdomain: "false",
+        },
+      },
+      {
+        moduleVariables: {
+          agentapi_version: "v999.999.999",
+          agentapi_subdomain: "false",
+        },
+      },
+      {
+        moduleVariables: {
+          agentapi_version: "arbitrary-string-bypasses-validation",
+        },
+        shouldThrow: "",
+      }
+    ];
+    for (const { moduleVariables, shouldThrow } of cases) {
+      if (shouldThrow) {
+        expect(setup({ moduleVariables: moduleVariables as Record<string, string> })).rejects.toThrow(shouldThrow);
+      } else {
+        expect(setup({ moduleVariables: moduleVariables as Record<string, string> })).resolves.toBeDefined();
+      }
+    }
+  });
 });

registry/coder/modules/agentapi/main.tf

@@ -117,7 +117,7 @@ variable "install_agentapi" {
 variable "agentapi_version" {
   type        = string
   description = "The version of AgentAPI to install."
-  default     = "v0.2.3"
+  default     = "v0.3.3"
 }
 
 variable "agentapi_port" {
@@ -126,6 +126,31 @@ variable "agentapi_port" {
   default     = 3284
 }
 
+locals {
+  # agentapi_subdomain_false_min_version_expr matches a semantic version >= v0.3.3.
+  # Initial support was added in v0.3.1 but configuration via environment variable
+  # was added in v0.3.3.
+  # This is unfortunately a regex because there is no builtin way to compare semantic versions in Terraform.
+  # See: https://regex101.com/r/oHPyRa/1
+  agentapi_subdomain_false_min_version_expr = "^v(0\\.(3\\.[3-9]|3.[1-9]\\d+|[4-9]\\.\\d+|[1-9]\\d+\\.\\d+)|[1-9]\\d*\\.\\d+\\.\\d+)$"
+}
+
+variable "agentapi_subdomain" {
+  type        = bool
+  description = "Whether to use a subdomain for AgentAPI."
+  default     = true
+  validation {
+    condition = var.agentapi_subdomain || (
+      # If version doesn't look like a valid semantic version, just allow it.
+      # Note that boolean operators do not short-circuit in Terraform.
+      can(regex("^v\\d+\\.\\d+\\.\\d+$", var.agentapi_version)) ?
+      can(regex(local.agentapi_subdomain_false_min_version_expr, var.agentapi_version)) :
+      true
+    )
+    error_message = "Running with subdomain = false is only supported by agentapi >= v0.3.3."
+  }
+}
+
 variable "module_dir_name" {
   type        = string
   description = "Name of the subdirectory in the home directory for module files."
@@ -140,7 +165,14 @@ locals {
   encoded_post_install_script        = var.post_install_script != null ? base64encode(var.post_install_script) : ""
   agentapi_start_script_b64          = base64encode(var.start_script)
   agentapi_wait_for_start_script_b64 = base64encode(file("${path.module}/scripts/agentapi-wait-for-start.sh"))
-  main_script                        = file("${path.module}/scripts/main.sh")
+  // Chat base path is only set if not using a subdomain.
+  // NOTE:
+  //   - Initial support for --chat-base-path was added in v0.3.1 but configuration
+  //     via environment variable AGENTAPI_CHAT_BASE_PATH was added in v0.3.3.
+  //   - As CODER_WORKSPACE_AGENT_NAME is a recent addition we use agent ID
+  //     for backward compatibility.
+  agentapi_chat_base_path = var.agentapi_subdomain ? "" : "/@${data.coder_workspace_owner.me.name}/${data.coder_workspace.me.name}.${var.agent_id}/apps/${var.web_app_slug}/chat"
+  main_script             = file("${path.module}/scripts/main.sh")
 }
 
 resource "coder_script" "agentapi" {
@@ -165,6 +197,7 @@ resource "coder_script" "agentapi" {
     ARG_WAIT_FOR_START_SCRIPT="$(echo -n '${local.agentapi_wait_for_start_script_b64}' | base64 -d)" \
     ARG_POST_INSTALL_SCRIPT="$(echo -n '${local.encoded_post_install_script}' | base64 -d)" \
     ARG_AGENTAPI_PORT='${var.agentapi_port}' \
+    ARG_AGENTAPI_CHAT_BASE_PATH='${local.agentapi_chat_base_path}' \
     /tmp/main.sh
     EOT
   run_on_start = true
@@ -178,7 +211,7 @@ resource "coder_app" "agentapi_web" {
   icon         = var.web_app_icon
   order        = var.web_app_order
   group        = var.web_app_group
-  subdomain    = true
+  subdomain    = var.agentapi_subdomain
   healthcheck {
     url       = "http://localhost:${var.agentapi_port}/status"
     interval  = 3

registry/coder/modules/agentapi/scripts/main.sh

@@ -13,6 +13,7 @@ START_SCRIPT="$ARG_START_SCRIPT"
 WAIT_FOR_START_SCRIPT="$ARG_WAIT_FOR_START_SCRIPT"
 POST_INSTALL_SCRIPT="$ARG_POST_INSTALL_SCRIPT"
 AGENTAPI_PORT="$ARG_AGENTAPI_PORT"
+AGENTAPI_CHAT_BASE_PATH="${ARG_AGENTAPI_CHAT_BASE_PATH:-}"
 set +o nounset
 
 command_exists() {
@@ -92,5 +93,7 @@ export LANG=en_US.UTF-8
 export LC_ALL=en_US.UTF-8
 
 cd "${WORKDIR}"
+
+export AGENTAPI_CHAT_BASE_PATH="${AGENTAPI_CHAT_BASE_PATH:-}"
 nohup "$module_path/scripts/agentapi-start.sh" true "${AGENTAPI_PORT}" &>"$module_path/agentapi-start.log" &
 "$module_path/scripts/agentapi-wait-for-start.sh" "${AGENTAPI_PORT}"

registry/coder/modules/agentapi/test-util.ts

@@ -24,7 +24,16 @@ export const setupContainer = async ({
   });
   const coderScript = findResourceInstance(state, "coder_script");
   const id = await runContainer(image ?? "codercom/enterprise-node:latest");
-  return { id, coderScript, cleanup: () => removeContainer(id) };
+  return {
+    id, coderScript, cleanup: async () => {
+      if (process.env["DEBUG"] === "true" || process.env["DEBUG"] === "1" || process.env["DEBUG"] === "yes") {
+        console.log(`Not removing container ${id} in debug mode`);
+        console.log(`Run "docker rm -f ${id}" to remove it manually.`);
+      } else {
+        await removeContainer(id);
+      }
+    }
+  };
 };
 
 export const loadTestFile = async (

registry/coder/modules/agentapi/testdata/agentapi-start.sh

@@ -11,6 +11,12 @@ log_file_path="$module_path/agentapi.log"
 echo "using prompt: $use_prompt" >>/home/coder/test-agentapi-start.log
 echo "using port: $port" >>/home/coder/test-agentapi-start.log
 
+AGENTAPI_CHAT_BASE_PATH="${AGENTAPI_CHAT_BASE_PATH:-}"
+if [ -n "$AGENTAPI_CHAT_BASE_PATH" ]; then
+    echo "Using AGENTAPI_CHAT_BASE_PATH: $AGENTAPI_CHAT_BASE_PATH" >>/home/coder/test-agentapi-start.log
+    export AGENTAPI_CHAT_BASE_PATH
+fi
+
 agentapi server --port "$port" --term-width 67 --term-height 1190 -- \
     bash -c aiagent \
     >"$log_file_path" 2>&1