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e0329ceee6
Without one every c7200 busy-waits a full CPU core for the whole scenario -- the tests create raw nodes and no template supplies a value (measured: constant ~100 % per router, up to ~6 minutes per dynamips scenario). harness.dynamips_idlepc() detects a value through the controller's auto_idlepc endpoint (the GUI idle-PC finder path: a throwaway project boots the image, candidate values are validated by measuring actual CPU usage) and caches it in ~/.cache/gns3-e2e/idlepc.json keyed by the image checksum, so the cost (~100 s here) is paid once per image, not per run. GNS3_E2E_IDLEPC overrides detection; any failure returns None and the scenarios run without one rather than fail on a CPU optimisation. All four scenarios that boot c7200 routers (dynamips kernel/relay, ethernet switch kernel/relay) pass the value at creation. Live: detected 0x60189234 for the M11 image (238 s first run including detection); the routers drop from ~100 % during boot to 3-8 % steady (sampled per process), and a re-run reports the cached value with no detection.
75 lines
3.7 KiB
Markdown
75 lines
3.7 KiB
Markdown
<!--
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SPDX-License-Identifier: CC-BY-SA-4.0
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See LICENSE file for licensing information.
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-->
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# Live end-to-end tests
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Tests under this directory run against a **real** server: real uBridge, real
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kernel interfaces (privileged), real emulator binaries and real images. They
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verify what unit tests cannot — that a datapath actually forwards traffic,
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that kernel bridges actually enslave anchors, that tc impairments actually
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shape packets. They are marked `e2e` and **excluded from normal test runs**
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(see `tests/pytest.ini`); run them explicitly:
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```bash
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pytest -m e2e tests/e2e -s # -s shows the progress prints
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pytest -m e2e tests/e2e -k dynamips # one scenario
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```
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Two run modes, chosen per test through `harness.live_server(kernel=...)`:
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* **Target an existing server** — set `GNS3_E2E_URL` (e.g.
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`http://127.0.0.1:3080/v3`, plus `GNS3_E2E_USER`/`GNS3_E2E_PASSWORD`,
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default admin/admin). The server must already be configured for the
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datapath under test (kernel links need `enable_kernel_datapath = True`).
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* **Isolated instance** (the default) — the harness starts its own server
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process on a free port with its own config directory (the controller DB
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and every path follow the config), so nothing on the machine is touched.
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It needs `ubridge`, `dynamips` and an images directory
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(`GNS3_E2E_IMAGES`, default `~/GNS3/images`) available locally.
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Either way each test creates its own project and deletes it again. Set
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`GNS3_E2E_KEEP=1` to keep the project (and a started instance) on failure
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and print where to look at it.
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The dynamips scenarios give their routers an idle-PC: detected once per
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image through the controller's `auto_idlepc` (a throwaway project and a
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real CPU-usage measurement — the GUI's idle-PC finder path) and cached in
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`~/.cache/gns3-e2e/idlepc.json` keyed by the image checksum. Without one,
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each c7200 burns a **full CPU core** for the whole scenario — the e2e
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creates raw nodes, so no template supplies a value. Set `GNS3_E2E_IDLEPC`
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to skip the detection and use the given value (detection failing is never
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fatal: the routers simply run without one).
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`harness.py` holds the shared pieces — REST client, server lifecycle, the
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IOS console driver, host-side kernel inspections (bridge membership, tap
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admin state, tc qdiscs, the L2-anchor spec §E assertions) — so a new node
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type adds only its own scenario module.
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Current scenarios:
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* `test_dynamips_kernel_datapath.py` — two real c7200 routers: kernel link
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(anchors, per-link bridge, netem delay, suspend, capture, delete/re-create,
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stop/start) plus a serial link staying on the relay, and a negative
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control on an isolated relay-configured instance.
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* `test_ethernet_switch_kernel_datapath.py` — a real Ethernet switch
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(kernel bridge) between two c7200 routers: deferred joins on boot, VLAN
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isolation, absorbed-anchor filters/suspend/capture, VPCS peers staying on
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the relay, and a relay negative control.
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* `test_iol_docker_kernel_datapath.py` — two real iol-xe containers (Cisco
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CML iol-runner images): kernel link through the port bridge's swappable
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TAP leg (anchors at start, netem delay, suspend, capture, link
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delete/re-create swap, node stop/start rewiring) and a relay negative
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control.
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Every kernel scenario also asserts the L2-anchor spec's server-side
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guarantees (`docs/design/ubridge-l2-anchor-spec.md` §E): anchors and bridges
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carry no L3 identity (`assert_pure_l2`), joined ports are FORWARDING
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(`assert_forwarding`), and — in the Dynamips suite — an idle link with the
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guests silenced stays silent for 5 s (`assert_idle_silence`). These skip on
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a uBridge without `link l2only` (probed once by `harness.l2only_supported()`).
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Set `GNS3_E2E_DEBUG=1` to run the isolated instance with debug logging (the
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uBridge command stream lands in its `server.log`).
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