Interface BackendSwitchProvider

interface BackendSwitchProvider {
    assertCandidateHostPublished(
        input: {
            candidate: ExternalReleaseSnapshot;
            fence: ExternalMutationFence;
            target: ExternalPlatformTargetDescription;
            targetSpec: DeploymentSpec;
        },
    ): Promise<void>;
    assertCandidateServing(
        input: {
            candidate: ExternalReleaseSnapshot;
            fence: ExternalMutationFence;
            targetSpec: DeploymentSpec;
        },
    ): Promise<void>;
    assertFinalizedState(
        input: {
            currentRecord: FleetRecord;
            fence: ExternalMutationFence;
            plan: BridgeMutationPlan;
            target: ExternalPlatformTargetDescription;
            targetSpec: DeploymentSpec;
        },
    ): Promise<void>;
    assertPlainBridgeServing(
        input: {
            bridge: BridgeSnapshot;
            fence: ExternalMutationFence;
            prior: PlainBackendSnapshot;
        },
    ): Promise<void>;
    assertSwitchApplicationR2Detached(
        resource: ApplicationR2Resource,
        fence: ExternalMutationFence,
    ): Promise<void>;
    assertSwitchApplicationR2Empty(
        resource: ApplicationR2Resource,
        fence: ExternalMutationFence,
    ): Promise<void>;
    assertSwitchTrafficRemoved(
        input: { prior: PlainBackendSnapshot; routeHostname: string },
    ): Promise<void>;
    commitFinalizedOwnership(
        input: {
            bridge: BridgeSnapshot;
            currentRecord: FleetRecord;
            fence: ExternalMutationFence;
            target: ExternalPlatformTargetDescription;
        },
    ): Promise<FleetRecord>;
    commitPlainOwnership(
        input: {
            currentRecord: FleetRecord;
            fence: ExternalMutationFence;
            prior: PlainBackendSnapshot;
            restoredArtifactVersion: string;
        },
    ): Promise<FleetRecord>;
    commitWorkersForPlatformsOwnership(
        input: {
            bridge: BridgeSnapshot;
            candidate: ExternalReleaseSnapshot;
            currentRecord: FleetRecord;
            fence: ExternalMutationFence;
            prior: PlainBackendSnapshot;
            target: ExternalPlatformTargetDescription;
            targetSpec: DeploymentSpec;
        },
    ): Promise<FleetRecord>;
    deleteSwitchApplicationR2(
        resource: ApplicationR2Resource,
        fence: ExternalMutationFence,
    ): Promise<void>;
    deleteSwitchDatabase(
        input: {
            fence: ExternalMutationFence;
            prior: PlainBackendSnapshot;
            targetSpec: DeploymentSpec;
        },
    ): Promise<void>;
    describeBridge(
        input: {
            prior: PlainBackendSnapshot;
            priorSpec: DeploymentSpec;
            targetSpec: DeploymentSpec;
        },
    ): BridgeMutationPlan;
    describeFinalizedBridgeTarget(
        targetSpec: DeploymentSpec,
        currentRecord: FleetRecord,
    ): ExternalPlatformTargetDescription;
    describeFinalizedState(
        input: {
            currentRecord: FleetRecord;
            target: ExternalPlatformTargetDescription;
            targetSpec: DeploymentSpec;
        },
    ): BridgeMutationPlan;
    detachPlainCustomDomain(
        input: {
            bridge: BridgeSnapshot;
            fence: ExternalMutationFence;
            prior: PlainBackendSnapshot;
        },
    ): Promise<void>;
    ensureBridge(
        input: {
            fence: ExternalMutationFence;
            plan: BridgeMutationPlan;
            prior: PlainBackendSnapshot;
            priorSpec: DeploymentSpec;
            secrets: DeploymentSecrets;
            targetSpec: DeploymentSpec;
        },
    ): Promise<BridgeSnapshot>;
    ensureCandidate(
        input: {
            bridge: BridgeSnapshot;
            currentRecord: FleetRecord;
            fence: ExternalMutationFence;
            secrets: DeploymentSecrets;
            target: ExternalPlatformTargetDescription;
            targetSpec: DeploymentSpec;
        },
    ): Promise<BackendSwitchCandidateSnapshot>;
    ensureFinalizedState(
        input: {
            currentRecord: FleetRecord;
            fence: ExternalMutationFence;
            plan: BridgeMutationPlan;
            target: ExternalPlatformTargetDescription;
            targetSpec: DeploymentSpec;
        },
    ): Promise<BridgeSnapshot>;
    ensureStateOnlyBridge(
        input: {
            bridge: BridgeSnapshot;
            fence: ExternalMutationFence;
            target: ExternalPlatformTargetDescription;
            targetSpec: DeploymentSpec;
        },
    ): Promise<BridgeSnapshot>;
    exportSwitchDatabase(
        input: {
            fence: ExternalMutationFence;
            prior: PlainBackendSnapshot;
            targetSpec: DeploymentSpec;
        },
    ): Promise<DatabaseExport>;
    findSwitchApplicationR2(
        resource: ApplicationR2Resource,
    ): Promise<ApplicationR2BucketSnapshot | undefined>;
    privatizeBridge(
        input: { bridge: BridgeSnapshot; fence: ExternalMutationFence },
    ): Promise<BridgeSnapshot>;
    publishCandidateHost(
        input: {
            bridge: BridgeSnapshot;
            candidate: ExternalReleaseSnapshot;
            fence: ExternalMutationFence;
            target: ExternalPlatformTargetDescription;
            targetSpec: DeploymentSpec;
        },
    ): Promise<void>;
    recoverBridge(
        input: {
            fence: ExternalMutationFence;
            plan: BridgeMutationPlan;
            prior: PlainBackendSnapshot;
            priorSpec: DeploymentSpec;
            targetSpec: DeploymentSpec;
        },
    ): Promise<BridgeSnapshot | undefined>;
    removeCandidateHostAndDrain(
        input: {
            candidate: ExternalReleaseSnapshot;
            fence: ExternalMutationFence;
            targetSpec: DeploymentSpec;
        },
    ): Promise<void>;
    removeSwitchBridge(
        input: {
            allowedArtifactVersions: readonly string[];
            bridge?: BridgeSnapshot;
            fence: ExternalMutationFence;
            plan?: BridgeMutationPlan;
            prior: PlainBackendSnapshot;
            priorSpec: DeploymentSpec;
            targetSpec: DeploymentSpec;
        },
    ): Promise<void>;
    removeSwitchRelease(
        input: {
            environment: string;
            fence: ExternalMutationFence;
            prior: PlainBackendSnapshot;
            release: ExternalReleaseSnapshot;
            routeHostname: string;
            tenantTag: string;
        },
    ): Promise<void>;
    removeSwitchTraffic(
        input: {
            allowedArtifactVersions: readonly string[];
            bridge?: BridgeSnapshot;
            environment: string;
            fence: ExternalMutationFence;
            plan?: BridgeMutationPlan;
            prior: PlainBackendSnapshot;
            priorSpec: DeploymentSpec;
            routeHostname: string;
            routeTargets: readonly HostRoutingTarget[];
            targetSpec: DeploymentSpec;
            tenantTag: string;
        },
    ): Promise<void>;
    restorePlainDeployment(
        input: {
            bridge: BridgeSnapshot;
            fence: ExternalMutationFence;
            prior: PlainBackendSnapshot;
            priorSpec: DeploymentSpec;
            secrets: DeploymentSecrets;
            targetSpec: DeploymentSpec;
        },
    ): Promise<string>;
    routePlainDomainToBridge(
        input: {
            bridge: BridgeSnapshot;
            fence: ExternalMutationFence;
            prior: PlainBackendSnapshot;
        },
    ): Promise<void>;
    snapshotPlainDeployment(
        priorSpec: DeploymentSpec,
        currentRecord: FleetRecord,
        fence: ExternalMutationFence,
    ): Promise<PlainBackendSnapshot>;
}