feat: Resumable Media Upload functionality implementation

gapic-common/.gitignore

@@ -15,3 +15,7 @@ vendor
 *~
 .idea
 *.iml
+
+# Modified Gemfiles toys writes while running a step; bundler re-creates the lock
+# just after toys deletes it, so a stray one is left behind by every `toys ci`.
+.toys-tmp-gemfile-*

gapic-common/.toys.rb

@@ -30,10 +30,6 @@
 end
 tool "yard", delegate_to: "yardoc"
 
-expand :gem_build
-
-expand :gem_build, name: "install", install_gem: true
-
 tool "ci" do
   include :exec, e: true
   include :terminal

gapic-common/.toys/test-integration.rb

@@ -0,0 +1,139 @@
+# frozen_string_literal: true
+
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require "socket"
+require "tmpdir"
+
+expand :minitest, name: "" do |t|
+  t.libs = ["lib", "integration"]
+  t.files = ["integration/**/*_test.rb"]
+  t.bundler = true
+end
+
+alias_method :run_minitest, :run
+
+def run
+  if !ENV["SHOWCASE_ENDPOINT"].to_s.empty?
+    run_minitest
+    return
+  end
+
+  bin = resolve_showcase_bin
+  if bin.nil?
+    if !ENV["CI"].to_s.empty?
+      logger.error "No SHOWCASE_ENDPOINT or gapic-showcase binary found in CI environment."
+      exit 1
+    else
+      logger.warn "Skipping integration tests: no SHOWCASE_ENDPOINT or gapic-showcase binary found."
+      return
+    end
+  end
+
+  verify_showcase_version! bin
+
+  port = allocate_port
+  fallback_port = allocate_port
+  log_path = File.join Dir.tmpdir, "gapic-showcase-#{Process.pid}-#{Time.now.to_i}.log"
+
+  pid = Process.spawn(
+    bin, "run",
+    "--port", ":#{port}",
+    "--fallback-port", ":#{fallback_port}",
+    out: log_path,
+    err: log_path,
+    pgroup: true
+  )
+
+  begin
+    wait_for_showcase! pid, port, log_path
+    ENV["SHOWCASE_ENDPOINT"] = "http://localhost:#{port}"
+    run_minitest
+  ensure
+    if pid
+      begin
+        Process.kill "-TERM", pid
+        Process.waitpid pid
+      rescue Errno::ESRCH, Errno::ECHILD
+        # Process already terminated
+      end
+    end
+  end
+end
+
+def resolve_showcase_bin
+  env_bin = ENV["SHOWCASE_BIN"].to_s
+  return env_bin unless env_bin.empty?
+
+  ENV.fetch("PATH", "").split(File::PATH_SEPARATOR).each do |dir|
+    candidate = File.join dir, "gapic-showcase"
+    return candidate if File.executable?(candidate) && !File.directory?(candidate)
+  end
+  nil
+end
+
+def verify_showcase_version!(bin)
+  output = begin
+    IO.popen([bin, "--version"], err: [:child, :out], &:read).strip
+  rescue StandardError => e
+    logger.error "Failed to execute '#{bin} --version': #{e.message}"
+    exit 1
+  end
+
+  version_match = output[/\d+\.\d+(?:\.\d+)*/]
+  if version_match.nil?
+    logger.error "Could not parse version from '#{bin} --version' output: #{output.inspect}"
+    exit 1
+  end
+
+  if Gem::Version.new(version_match) < Gem::Version.new("0.43")
+    logger.error "gapic-showcase version #{version_match} is too old (minimum required is 0.43)."
+    exit 1
+  end
+end
+
+def allocate_port
+  server = TCPServer.open "127.0.0.1", 0
+  port = server.addr[1]
+  server.close
+  port
+end
+
+def wait_for_showcase!(pid, port, log_path)
+  deadline = Process.clock_gettime(Process::CLOCK_MONOTONIC) + 10.0
+
+  loop do
+    exited_pid, status = Process.waitpid2 pid, Process::WNOHANG
+    if exited_pid
+      logger.error "gapic-showcase exited prematurely (status: #{status.exitstatus}). Log file: #{log_path}"
+      exit 1
+    end
+
+    begin
+      sock = TCPSocket.new "127.0.0.1", port
+      sock.close
+      return
+    rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
+      # Server not ready yet
+    end
+
+    if Process.clock_gettime(Process::CLOCK_MONOTONIC) >= deadline
+      logger.error "Timed out waiting 10s for gapic-showcase to listen on port #{port}. Log file: #{log_path}"
+      exit 1
+    end
+
+    sleep 0.1
+  end
+end

gapic-common/integration/README.md

@@ -0,0 +1,51 @@
+# Integration Tests
+
+This directory contains integration tests for `gapic-common`, executed against a running `gapic-showcase` server via the `toys test-integration` command.
+
+## Running Integration Tests
+
+```bash
+toys test-integration
+```
+
+You can pass standard Minitest flags to filter or seed test runs:
+
+```bash
+toys test-integration --name /resumable_upload/ --seed 1234
+```
+
+## Showcase Server Management & Lifecycle
+
+The `toys test-integration` command (`.toys/test-integration.rb`) manages the `gapic-showcase` server lifecycle automatically:
+
+1. **Existing Endpoint (`SHOWCASE_ENDPOINT`)**:
+   - If `ENV["SHOWCASE_ENDPOINT"]` is present and non-empty, `toys test-integration` skips binary resolution and runs the Minitest suite directly against that endpoint.
+
+2. **Binary Resolution (`SHOWCASE_BIN` / `PATH`)**:
+   - When `SHOWCASE_ENDPOINT` is not set, the runner checks `ENV["SHOWCASE_BIN"]` first, then searches `ENV["PATH"]` for an executable `gapic-showcase` binary.
+   - **Version Check**: The runner executes `<binary> --version` and verifies that the version is at least `0.43`. If the version is older than `0.43`, it logs an error and exits with status `1`.
+
+3. **Missing Endpoint and Binary**:
+   - **CI Environment (`ENV["CI"]` set)**: Fails immediately with exit status `1`.
+   - **Local Environment (`ENV["CI"]` unset)**: Logs an informational message and skips integration tests cleanly (exit status `0`).
+
+4. **Ephemeral Port Allocation & Polling**:
+   - Allocates two ephemeral TCP ports on `127.0.0.1` for `--port :<port>` and `--fallback-port :<fallback_port>` to avoid port collisions across concurrent runs.
+   - Spawns `gapic-showcase run --port :<port> --fallback-port :<fallback_port>` in a dedicated process group (`pgroup: true`) with `stdout` and `stderr` redirected to a temporary log file in `Dir.tmpdir`.
+   - Polls `127.0.0.1:<port>` with a 10-second monotonic clock budget while checking `Process.waitpid2` (`WNOHANG`) on each iteration. If the process exits prematurely or fails to accept TCP connections within 10 seconds, the runner prints the path to the log file and exits with status `1`.
+
+5. **Execution & Teardown**:
+   - Sets `ENV["SHOWCASE_ENDPOINT"] = "http://localhost:#{port}"` and runs the Minitest suite (`integration/**/*_test.rb`).
+   - An `ensure` block sends `SIGTERM` to the entire process group (`-TERM`) and reaps the child process so no background showcase processes are leaked.
+
+## Logging and Diagnostics
+
+Each integration test captures `DEBUG`-level client and driver logs into an in-memory buffer during execution:
+
+- **Automatic Failure Dump**: If a test fails or raises an unhandled exception, the captured trace is automatically dumped to `stderr` during `teardown`.
+- **Force Log Dump (`SHOWCASE_LOG`)**: Set `SHOWCASE_LOG=1` (or any non-empty value) to dump the captured trace for all executed tests, including passing ones:
+
+```bash
+SHOWCASE_LOG=1 toys test-integration
+```
+