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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsTo tell whether a realtime auction bidder is still participating, test more than whether its WebRTC peer connection is connected. Transport state can confirm that a network path is available, but it cannot establish that the bidder is authenticated, subscribed to the auction, or responding to application messages. In Go, Pion exposes useful WebRTC state callbacks and accessors; pair them with an application-level liveness contract.
How do I test WebRTC connection state in Go?
Pion is “a pure Go implementation of the WebRTC API,” and its current major package path is github.com/pion/webrtc/v4. The project uses Go Modules. See the Pion WebRTC repository and Pion v4 API documentation. Pin a specific v4 module version in your project rather than relying on an unbounded dependency; the repository’s major version and available releases can change.
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A contract test should assert what your auction service promises to do when these signals change—not assume that WebRTC defines a bidder-presence model. The five signals below cover distinct layers. State callbacks are event-driven; application liveness is established by the freshness of messages your protocol defines.
Which five presence signals should bidder contract tests cover?
1. Signaling state: did the offer/answer contract progress?
Observe signaling lifecycle transitions with Pion’s OnSignalingStateChange callback and SignalingState() accessor. Test the sequence your service actually uses to exchange offers, answers, and any renegotiation messages. There is no single expected sequence for every auction architecture: it depends on which peer creates descriptions and how your signaling service relays them.
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A signaling state describes the offer/answer process, not whether the resulting network path works or the bidder remains subscribed. Treat it as evidence about negotiation progress; on an unexpected transition, apply the signaling contract’s error or renegotiation handling rather than marking the bidder present solely on this basis.
2. ICE connection state: is the ICE transport path available?
Test the relevant ICE states: new, checking, connected, completed, disconnected, failed, and closed. Pion exposes the ICE state and its changes; the state definitions describe transport conditions. Consult the Pion ICE connection state source.
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connected or completed means ICE has established connectivity, not that the bidder is authenticated, has acknowledged the current auction subscription, or is processing bids. A disconnected state can be transient: Pion’s play-from-disk example notes its usefulness for faster timeout detection while recognizing recovery may occur. Define a grace-period policy in your service: retain the session temporarily, mark it suspect, and decide when to reconnect or evict according to auction rules.
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3. Aggregate peer connection state: what is the overall WebRTC connection reporting?
Use OnConnectionStateChange and ConnectionState() to observe the aggregate peer connection state. Pion computes this state from ICE and DTLS transport states; it is useful for handling broader connection changes, errors, and closure. Its implementation is visible in Pion’s peerconnection.go.
Keep the aggregate state distinct from both the signaling lifecycle and application health. A connected aggregate state still does not prove auction participation. Contract tests should verify that your service responds correctly to the states it relies on, and that error and close paths release or transition session resources as intended.
4. ICE gathering and candidate flow: did candidates reach the other peer?
Verify that candidates are collected and conveyed using the signaling protocol your application chose. Pion documents that gathering begins after setting a local or remote description, and its ICE candidate callback receives nil when gathering is complete. Your contract test should check candidate delivery and completion against the actual protocol, including any ordering or message handling your implementation requires.
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Trickle ICE sends candidates as they are discovered; another design waits for gathering to finish before sending the description with its candidates. Neither choice is a universal bidder-presence rule. Pin the application’s choice in tests so a change in signaling behavior does not silently leave a peer without the candidate information it needs.
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Define an application-level signal, such as a heartbeat or an acknowledgment that the bidder is subscribed to a particular auction. Test message freshness, missing-message handling, and recovery according to your product’s service-level objectives and auction rules. This is an architectural recommendation, not a universal Pion presence feature.
There is no generally correct heartbeat cadence or bidder timeout established for an unspecified auction product. Choose those values from your own latency, reliability, and auction requirements. Make the policy explicit: for example, distinguish a temporarily stale session from one that has exceeded the product’s allowed response window, and specify whether the service retains, reconnects, or evicts it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How can I tell if a WebRTC peer is still connected?
Use the WebRTC state callbacks to determine what is happening at the signaling, ICE, and aggregate connection layers, then check your application-level message contract for evidence that the bidder remains responsive. These are complementary observations, not interchangeable proofs. A test that sees only connected can pass while the bidder is no longer subscribed or its application has stopped responding.
Pion also exposes data channel and track events, which can be useful where those are part of the application’s protocol. They should be tested as protocol events, not treated as a substitute for an explicit auction acknowledgment or heartbeat.
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How do I detect a disconnected bidder?
Decide what “disconnected” means for the auction before writing the assertion. A transport interruption, a failed negotiation, a closed peer connection, and an application heartbeat timeout are different conditions. Map each relevant observation to a deliberate service response, and include recovery behavior for transient ICE disconnection rather than treating every interruption as immediate permanent departure.
- Retain: keep the bidder session during a defined recovery window when the signal may be transient.
- Suspect: mark the session as not currently confirmed when transport or application evidence becomes stale.
- Reconnect: start the product’s recovery flow when its connection policy calls for it.
- Evict: remove the bidder when the applicable auction or liveness contract says participation has ended.
Tests should assert both the observed state and the resulting auction-service action. That keeps infrastructure-level connection reporting from being mistaken for a business decision about whether a bidder may participate.
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