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feat: add InternetComputer.subnetSelfNodeCount #565

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1 change: 1 addition & 0 deletions Changelog.md
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
## Next
* Add `InternetComputer.subnetSelfNodeCount`, wrapping `ic0.subnet_self_node_count`, so sizing a flexible HTTPS outcall's committee no longer requires importing `mo:⛔` (#TBD).

## 2.7.0
* Derive `toText` implicit arguments for variants: import the new `Variants` module, plus the new `Unit` module for cases without a payload, and a variant renders the way `debug_show` prints it, for example `#active` or `#banned(3, abuse)`. Add the `toText`, `equal`, and `compare` functions that derivation needs but that were missing: `Blob.toText`, `Order.compare`, `Order.toText`, and `PriorityQueue.equal`, `PriorityQueue.compare`, and `PriorityQueue.toText`, which list elements in priority order (#560).
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9 changes: 9 additions & 0 deletions src/InternetComputer.mo
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Expand Up @@ -39,6 +39,15 @@ module {
/// `isReplicated` is true for update messages and for queries that passed through consensus.
public let isReplicated : () -> Bool = Prim.isReplicatedExecution;

/// The number of nodes on the subnet this canister runs on.
///
/// Useful for sizing a flexible HTTPS outcall, whose `total_requests` must not exceed it:
///
/// ```motoko no-repl
/// let totalRequests = Nat32.min(InternetComputer.subnetSelfNodeCount(), 5);
/// ```
public let subnetSelfNodeCount : () -> Nat32 = Prim.subnetSelfNodeCount;

/// Given computation, `comp`, counts the number of actual and (for IC system calls) notional WebAssembly
/// instructions performed during the execution of `comp()`.
///
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