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Contents

handle1 method

IngressMount

An opaque capability for subscribing to one operator-named ingress channel. The operator configures the channel, its access control and its decryption keys; none of it is visible to the app. Handles come only from datumhue.args.ingress_mounts, and an app holding one can pass it on to a child through app.spawn's ingress_mounts. Records travel to subscribers encrypted, and subscribe delivers each authenticated record to a callback.

Obtained from
datumhue.args
Accepted by
datumhue.app.spawn

The examples on this page start from:

lua
local orders = datumhue.args.ingress_mounts.orders

Methods 1

IngressMount:subscribe

method
IngressMount:subscribe(opts: IngressMount.SubscribeOptions) -> Subscription

Subscribe to the channel behind this handle. The callback fires with each authenticated record. Returns a subscription; call :unsubscribe() to stop it. Records that are not authenticated for the channel, or that fail decryption, are dropped silently. Delivery starts once the subscription has joined the channel, usually within a second; a record pushed before that may not arrive.

Example
local sub = orders:subscribe({
    callback = function(record)
        local order = record.payload:json()
        print(record.channel, order.id)
    end,
})

opts IngressMount.SubscribeOptions options 2 keys

KeyTypeDefaultDescription
channelstringthe mount's default channelSub-channel selector, when the mount carries several streams.
callback requiredfun(event: IngressEvent)no defaultInvoked with each authenticated record. Duplicates (by the source's idempotency key) are collapsed before delivery.

Types 1

IngressEvent

record

record 3 keys

KeyTypeDescription
channelstringThe channel the record arrived on.
payloadBytesThe record's application payload as opaque Bytes.
headerstable<string, string>Application headers the source set that the mount passes on with the record.

Nested in: IngressMount.SubscribeOptions

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This Font Software is licensed under the SIL Open Font License, Version 1.1.
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