Spider API

Start thread

Poke spider with mark %spider-start and a vase containing start-args:

+$  start-args
  [parent=(unit tid) use=(unit tid) =beak file=term =vase]

Where:

• parent - optional tid of parent thread if the thread is a child. If specified, the child thread will be killed with the parent thread ends.
• use - tid (thread ID) to give the new thread. Can be generated with something like (scot %ta (cat 3 'my-agent_' (scot %uv (sham eny)))). However you do it, make sure it's unique.
• beak - A $beak is a triple of [p=ship q=desk r=case]. p is always our ship, q is the desk which contains the thread we want to run. r is a case, which specifies a desk revision and is a tagged union of:

  +$  case
    $%  [%da p=@da]      ::  date
        [%tas p=@tas]    ::  label
        [%ud p=@ud]      ::  number
    ==

  You'll almost always just want the current revision, so you can specify the case as da+now.bowl. If the thread is on the same desk as the agent you can also just use byk.bowl(r da+now.bowl) for the beak.
• file - name of the thread file in /ted. For example, if the thread you want to start is /ted/foo/hoon you'd specify %foo.
• vase - vase to be given to the thread when it's started. Can be whatever or just !>(~) if it doesn't need any args.

Example

[%pass /some-path %agent [our.bowl %spider] %poke %spider-start !>([~ `tid byk.bowl(r da+now.bowl) %foo !>(~)])]

Stop thread

Poke spider with mark %spider-stop and a vase containing [tid ?], where:

• tid - the tid of the thread you want to stop
• ? - whether thread should end nicely. If %.y it'll end with mark %thread-done and the bunt value of a vase. If %.n it'll end with mark %thread-fail and a [term tang] where term is %cancelled and tang is ~.

Example

[%pass /some-path %agent [our.bowl %spider] %poke %spider-stop !>([tid %.y)]

Subscribe for result

Spider will send the result on /thread-result/[tid] so you can subscribe there for the result. You should subscribe before starting the thread.

The result will have a mark of either %thread-fail or %thread-done.

• %thread-fail - has a vase containing a [term tang] where term is an error message and tang is a traceback.
• %thread-done - has a vase of the result of the thread.

Example

[%pass /some-path %agent [our.bowl %spider] %watch /thread-result/[tid]]

Subscribe to thread

You can subscribe to a thread on /thread/[tid]/path. Note this is for facts sent off by the thread while it's running, not the final result. The path depends on the particular thread.

Example

[%pass /some-path %agent [our.bowl %spider] %watch /thread/[tid]/thread-path]

Poke thread

To poke a thread you poke spider with a mark of %spider-input and a vase of [tid cage].

• tid is the tid of the thread you want to poke
• cage is whatever mark and vase you want to poke it with

Example

[%pass /some-path %agent [our.bowl %spider] %poke %spider-input !>([tid %foo !>('foooo')])]