Initial commit

node_modules/effect/dist/esm/internal/channel/channelExecutor.js

@@ -0,0 +1,688 @@
+import * as Cause from "../../Cause.js";
+import * as Deferred from "../../Deferred.js";
+import * as Effect from "../../Effect.js";
+import * as ExecutionStrategy from "../../ExecutionStrategy.js";
+import * as Exit from "../../Exit.js";
+import * as Fiber from "../../Fiber.js";
+import * as FiberId from "../../FiberId.js";
+import { dual, identity, pipe } from "../../Function.js";
+import * as HashSet from "../../HashSet.js";
+import * as Option from "../../Option.js";
+import * as Scope from "../../Scope.js";
+import * as core from "../core-stream.js";
+import * as ChannelOpCodes from "../opCodes/channel.js";
+import * as ChildExecutorDecisionOpCodes from "../opCodes/channelChildExecutorDecision.js";
+import * as ChannelStateOpCodes from "../opCodes/channelState.js";
+import * as UpstreamPullStrategyOpCodes from "../opCodes/channelUpstreamPullStrategy.js";
+import * as ContinuationOpCodes from "../opCodes/continuation.js";
+import * as ChannelState from "./channelState.js";
+import * as Continuation from "./continuation.js";
+import * as Subexecutor from "./subexecutor.js";
+import * as upstreamPullRequest from "./upstreamPullRequest.js";
+/** @internal */
+export class ChannelExecutor {
+  _activeSubexecutor = undefined;
+  _cancelled = undefined;
+  _closeLastSubstream = undefined;
+  _currentChannel;
+  _done = undefined;
+  _doneStack = [];
+  _emitted = undefined;
+  _executeCloseLastSubstream;
+  _input = undefined;
+  _inProgressFinalizer = undefined;
+  _providedEnv;
+  constructor(initialChannel, providedEnv, executeCloseLastSubstream) {
+    this._currentChannel = initialChannel;
+    this._executeCloseLastSubstream = executeCloseLastSubstream;
+    this._providedEnv = providedEnv;
+  }
+  run() {
+    let result = undefined;
+    while (result === undefined) {
+      if (this._cancelled !== undefined) {
+        result = this.processCancellation();
+      } else if (this._activeSubexecutor !== undefined) {
+        result = this.runSubexecutor();
+      } else {
+        try {
+          if (this._currentChannel === undefined) {
+            result = ChannelState.Done();
+          } else {
+            if (Effect.isEffect(this._currentChannel)) {
+              this._currentChannel = core.fromEffect(this._currentChannel);
+            }
+            switch (this._currentChannel._tag) {
+              case ChannelOpCodes.OP_BRACKET_OUT:
+                {
+                  result = this.runBracketOut(this._currentChannel);
+                  break;
+                }
+              case ChannelOpCodes.OP_BRIDGE:
+                {
+                  const bridgeInput = this._currentChannel.input;
+                  // PipeTo(left, Bridge(queue, channel))
+                  // In a fiber: repeatedly run left and push its outputs to the queue
+                  // Add a finalizer to interrupt the fiber and close the executor
+                  this._currentChannel = this._currentChannel.channel;
+                  if (this._input !== undefined) {
+                    const inputExecutor = this._input;
+                    this._input = undefined;
+                    const drainer = () => Effect.flatMap(bridgeInput.awaitRead(), () => Effect.suspend(() => {
+                      const state = inputExecutor.run();
+                      switch (state._tag) {
+                        case ChannelStateOpCodes.OP_DONE:
+                          {
+                            return Exit.match(inputExecutor.getDone(), {
+                              onFailure: cause => bridgeInput.error(cause),
+                              onSuccess: value => bridgeInput.done(value)
+                            });
+                          }
+                        case ChannelStateOpCodes.OP_EMIT:
+                          {
+                            return Effect.flatMap(bridgeInput.emit(inputExecutor.getEmit()), () => drainer());
+                          }
+                        case ChannelStateOpCodes.OP_FROM_EFFECT:
+                          {
+                            return Effect.matchCauseEffect(state.effect, {
+                              onFailure: cause => bridgeInput.error(cause),
+                              onSuccess: () => drainer()
+                            });
+                          }
+                        case ChannelStateOpCodes.OP_READ:
+                          {
+                            return readUpstream(state, () => drainer(), cause => bridgeInput.error(cause));
+                          }
+                      }
+                    }));
+                    result = ChannelState.fromEffect(Effect.flatMap(Effect.forkDaemon(Effect.interruptible(drainer())), fiber => Effect.sync(() => this.addFinalizer(exit => Effect.flatMap(Fiber.interrupt(fiber), () => Effect.suspend(() => {
+                      const effect = this.restorePipe(exit, inputExecutor);
+                      return effect !== undefined ? effect : Effect.void;
+                    }))))));
+                  }
+                  break;
+                }
+              case ChannelOpCodes.OP_CONCAT_ALL:
+                {
+                  const executor = new ChannelExecutor(this._currentChannel.value(), this._providedEnv, effect => Effect.sync(() => {
+                    const prevLastClose = this._closeLastSubstream === undefined ? Effect.void : this._closeLastSubstream;
+                    this._closeLastSubstream = pipe(prevLastClose, Effect.zipRight(effect));
+                  }));
+                  executor._input = this._input;
+                  const channel = this._currentChannel;
+                  this._activeSubexecutor = new Subexecutor.PullFromUpstream(executor, value => channel.k(value), undefined, [], (x, y) => channel.combineInners(x, y), (x, y) => channel.combineAll(x, y), request => channel.onPull(request), value => channel.onEmit(value));
+                  this._closeLastSubstream = undefined;
+                  this._currentChannel = undefined;
+                  break;
+                }
+              case ChannelOpCodes.OP_EMIT:
+                {
+                  this._emitted = this._currentChannel.out;
+                  this._currentChannel = this._activeSubexecutor !== undefined ? undefined : core.void;
+                  result = ChannelState.Emit();
+                  break;
+                }
+              case ChannelOpCodes.OP_ENSURING:
+                {
+                  this.runEnsuring(this._currentChannel);
+                  break;
+                }
+              case ChannelOpCodes.OP_FAIL:
+                {
+                  result = this.doneHalt(this._currentChannel.error());
+                  break;
+                }
+              case ChannelOpCodes.OP_FOLD:
+                {
+                  this._doneStack.push(this._currentChannel.k);
+                  this._currentChannel = this._currentChannel.channel;
+                  break;
+                }
+              case ChannelOpCodes.OP_FROM_EFFECT:
+                {
+                  const effect = this._providedEnv === undefined ? this._currentChannel.effect() : pipe(this._currentChannel.effect(), Effect.provide(this._providedEnv));
+                  result = ChannelState.fromEffect(Effect.matchCauseEffect(effect, {
+                    onFailure: cause => {
+                      const state = this.doneHalt(cause);
+                      return state !== undefined && ChannelState.isFromEffect(state) ? state.effect : Effect.void;
+                    },
+                    onSuccess: value => {
+                      const state = this.doneSucceed(value);
+                      return state !== undefined && ChannelState.isFromEffect(state) ? state.effect : Effect.void;
+                    }
+                  }));
+                  break;
+                }
+              case ChannelOpCodes.OP_PIPE_TO:
+                {
+                  const previousInput = this._input;
+                  const leftExec = new ChannelExecutor(this._currentChannel.left(), this._providedEnv, effect => this._executeCloseLastSubstream(effect));
+                  leftExec._input = previousInput;
+                  this._input = leftExec;
+                  this.addFinalizer(exit => {
+                    const effect = this.restorePipe(exit, previousInput);
+                    return effect !== undefined ? effect : Effect.void;
+                  });
+                  this._currentChannel = this._currentChannel.right();
+                  break;
+                }
+              case ChannelOpCodes.OP_PROVIDE:
+                {
+                  const previousEnv = this._providedEnv;
+                  this._providedEnv = this._currentChannel.context();
+                  this._currentChannel = this._currentChannel.inner;
+                  this.addFinalizer(() => Effect.sync(() => {
+                    this._providedEnv = previousEnv;
+                  }));
+                  break;
+                }
+              case ChannelOpCodes.OP_READ:
+                {
+                  const read = this._currentChannel;
+                  result = ChannelState.Read(this._input, identity, emitted => {
+                    try {
+                      this._currentChannel = read.more(emitted);
+                    } catch (error) {
+                      this._currentChannel = read.done.onExit(Exit.die(error));
+                    }
+                    return undefined;
+                  }, exit => {
+                    const onExit = exit => {
+                      return read.done.onExit(exit);
+                    };
+                    this._currentChannel = onExit(exit);
+                    return undefined;
+                  });
+                  break;
+                }
+              case ChannelOpCodes.OP_SUCCEED:
+                {
+                  result = this.doneSucceed(this._currentChannel.evaluate());
+                  break;
+                }
+              case ChannelOpCodes.OP_SUCCEED_NOW:
+                {
+                  result = this.doneSucceed(this._currentChannel.terminal);
+                  break;
+                }
+              case ChannelOpCodes.OP_SUSPEND:
+                {
+                  this._currentChannel = this._currentChannel.channel();
+                  break;
+                }
+            }
+          }
+        } catch (error) {
+          this._currentChannel = core.failCause(Cause.die(error));
+        }
+      }
+    }
+    return result;
+  }
+  getDone() {
+    return this._done;
+  }
+  getEmit() {
+    return this._emitted;
+  }
+  cancelWith(exit) {
+    this._cancelled = exit;
+  }
+  clearInProgressFinalizer() {
+    this._inProgressFinalizer = undefined;
+  }
+  storeInProgressFinalizer(finalizer) {
+    this._inProgressFinalizer = finalizer;
+  }
+  popAllFinalizers(exit) {
+    const finalizers = [];
+    let next = this._doneStack.pop();
+    while (next) {
+      if (next._tag === "ContinuationFinalizer") {
+        finalizers.push(next.finalizer);
+      }
+      next = this._doneStack.pop();
+    }
+    const effect = finalizers.length === 0 ? Effect.void : runFinalizers(finalizers, exit);
+    this.storeInProgressFinalizer(effect);
+    return effect;
+  }
+  popNextFinalizers() {
+    const builder = [];
+    while (this._doneStack.length !== 0) {
+      const cont = this._doneStack[this._doneStack.length - 1];
+      if (cont._tag === ContinuationOpCodes.OP_CONTINUATION_K) {
+        return builder;
+      }
+      builder.push(cont);
+      this._doneStack.pop();
+    }
+    return builder;
+  }
+  restorePipe(exit, prev) {
+    const currInput = this._input;
+    this._input = prev;
+    if (currInput !== undefined) {
+      const effect = currInput.close(exit);
+      return effect;
+    }
+    return Effect.void;
+  }
+  close(exit) {
+    let runInProgressFinalizers = undefined;
+    const finalizer = this._inProgressFinalizer;
+    if (finalizer !== undefined) {
+      runInProgressFinalizers = pipe(finalizer, Effect.ensuring(Effect.sync(() => this.clearInProgressFinalizer())));
+    }
+    let closeSelf = undefined;
+    const selfFinalizers = this.popAllFinalizers(exit);
+    if (selfFinalizers !== undefined) {
+      closeSelf = pipe(selfFinalizers, Effect.ensuring(Effect.sync(() => this.clearInProgressFinalizer())));
+    }
+    const closeSubexecutors = this._activeSubexecutor === undefined ? undefined : this._activeSubexecutor.close(exit);
+    if (closeSubexecutors === undefined && runInProgressFinalizers === undefined && closeSelf === undefined) {
+      return undefined;
+    }
+    return pipe(Effect.exit(ifNotNull(closeSubexecutors)), Effect.zip(Effect.exit(ifNotNull(runInProgressFinalizers))), Effect.zip(Effect.exit(ifNotNull(closeSelf))), Effect.map(([[exit1, exit2], exit3]) => pipe(exit1, Exit.zipRight(exit2), Exit.zipRight(exit3))), Effect.uninterruptible,
+    // TODO: remove
+    Effect.flatMap(exit => Effect.suspend(() => exit)));
+  }
+  doneSucceed(value) {
+    if (this._doneStack.length === 0) {
+      this._done = Exit.succeed(value);
+      this._currentChannel = undefined;
+      return ChannelState.Done();
+    }
+    const head = this._doneStack[this._doneStack.length - 1];
+    if (head._tag === ContinuationOpCodes.OP_CONTINUATION_K) {
+      this._doneStack.pop();
+      this._currentChannel = head.onSuccess(value);
+      return undefined;
+    }
+    const finalizers = this.popNextFinalizers();
+    if (this._doneStack.length === 0) {
+      this._doneStack = finalizers.reverse();
+      this._done = Exit.succeed(value);
+      this._currentChannel = undefined;
+      return ChannelState.Done();
+    }
+    const finalizerEffect = runFinalizers(finalizers.map(f => f.finalizer), Exit.succeed(value));
+    this.storeInProgressFinalizer(finalizerEffect);
+    const effect = pipe(finalizerEffect, Effect.ensuring(Effect.sync(() => this.clearInProgressFinalizer())), Effect.uninterruptible, Effect.flatMap(() => Effect.sync(() => this.doneSucceed(value))));
+    return ChannelState.fromEffect(effect);
+  }
+  doneHalt(cause) {
+    if (this._doneStack.length === 0) {
+      this._done = Exit.failCause(cause);
+      this._currentChannel = undefined;
+      return ChannelState.Done();
+    }
+    const head = this._doneStack[this._doneStack.length - 1];
+    if (head._tag === ContinuationOpCodes.OP_CONTINUATION_K) {
+      this._doneStack.pop();
+      try {
+        this._currentChannel = head.onHalt(cause);
+      } catch (error) {
+        this._currentChannel = core.failCause(Cause.die(error));
+      }
+      return undefined;
+    }
+    const finalizers = this.popNextFinalizers();
+    if (this._doneStack.length === 0) {
+      this._doneStack = finalizers.reverse();
+      this._done = Exit.failCause(cause);
+      this._currentChannel = undefined;
+      return ChannelState.Done();
+    }
+    const finalizerEffect = runFinalizers(finalizers.map(f => f.finalizer), Exit.failCause(cause));
+    this.storeInProgressFinalizer(finalizerEffect);
+    const effect = pipe(finalizerEffect, Effect.ensuring(Effect.sync(() => this.clearInProgressFinalizer())), Effect.uninterruptible, Effect.flatMap(() => Effect.sync(() => this.doneHalt(cause))));
+    return ChannelState.fromEffect(effect);
+  }
+  processCancellation() {
+    this._currentChannel = undefined;
+    this._done = this._cancelled;
+    this._cancelled = undefined;
+    return ChannelState.Done();
+  }
+  runBracketOut(bracketOut) {
+    const effect = Effect.uninterruptible(Effect.matchCauseEffect(this.provide(bracketOut.acquire()), {
+      onFailure: cause => Effect.sync(() => {
+        this._currentChannel = core.failCause(cause);
+      }),
+      onSuccess: out => Effect.sync(() => {
+        this.addFinalizer(exit => this.provide(bracketOut.finalizer(out, exit)));
+        this._currentChannel = core.write(out);
+      })
+    }));
+    return ChannelState.fromEffect(effect);
+  }
+  provide(effect) {
+    if (this._providedEnv === undefined) {
+      return effect;
+    }
+    return pipe(effect, Effect.provide(this._providedEnv));
+  }
+  runEnsuring(ensuring) {
+    this.addFinalizer(ensuring.finalizer);
+    this._currentChannel = ensuring.channel;
+  }
+  addFinalizer(f) {
+    this._doneStack.push(new Continuation.ContinuationFinalizerImpl(f));
+  }
+  runSubexecutor() {
+    const subexecutor = this._activeSubexecutor;
+    switch (subexecutor._tag) {
+      case Subexecutor.OP_PULL_FROM_CHILD:
+        {
+          return this.pullFromChild(subexecutor.childExecutor, subexecutor.parentSubexecutor, subexecutor.onEmit, subexecutor);
+        }
+      case Subexecutor.OP_PULL_FROM_UPSTREAM:
+        {
+          return this.pullFromUpstream(subexecutor);
+        }
+      case Subexecutor.OP_DRAIN_CHILD_EXECUTORS:
+        {
+          return this.drainChildExecutors(subexecutor);
+        }
+      case Subexecutor.OP_EMIT:
+        {
+          this._emitted = subexecutor.value;
+          this._activeSubexecutor = subexecutor.next;
+          return ChannelState.Emit();
+        }
+    }
+  }
+  replaceSubexecutor(nextSubExec) {
+    this._currentChannel = undefined;
+    this._activeSubexecutor = nextSubExec;
+  }
+  finishWithExit(exit) {
+    const state = Exit.match(exit, {
+      onFailure: cause => this.doneHalt(cause),
+      onSuccess: value => this.doneSucceed(value)
+    });
+    this._activeSubexecutor = undefined;
+    return state === undefined ? Effect.void : ChannelState.effect(state);
+  }
+  finishSubexecutorWithCloseEffect(subexecutorDone, ...closeFuncs) {
+    this.addFinalizer(() => pipe(closeFuncs, Effect.forEach(closeFunc => pipe(Effect.sync(() => closeFunc(subexecutorDone)), Effect.flatMap(closeEffect => closeEffect !== undefined ? closeEffect : Effect.void)), {
+      discard: true
+    })));
+    const state = pipe(subexecutorDone, Exit.match({
+      onFailure: cause => this.doneHalt(cause),
+      onSuccess: value => this.doneSucceed(value)
+    }));
+    this._activeSubexecutor = undefined;
+    return state;
+  }
+  applyUpstreamPullStrategy(upstreamFinished, queue, strategy) {
+    switch (strategy._tag) {
+      case UpstreamPullStrategyOpCodes.OP_PULL_AFTER_NEXT:
+        {
+          const shouldPrepend = !upstreamFinished || queue.some(subexecutor => subexecutor !== undefined);
+          return [strategy.emitSeparator, shouldPrepend ? [undefined, ...queue] : queue];
+        }
+      case UpstreamPullStrategyOpCodes.OP_PULL_AFTER_ALL_ENQUEUED:
+        {
+          const shouldEnqueue = !upstreamFinished || queue.some(subexecutor => subexecutor !== undefined);
+          return [strategy.emitSeparator, shouldEnqueue ? [...queue, undefined] : queue];
+        }
+    }
+  }
+  pullFromChild(childExecutor, parentSubexecutor, onEmitted, subexecutor) {
+    return ChannelState.Read(childExecutor, identity, emitted => {
+      const childExecutorDecision = onEmitted(emitted);
+      switch (childExecutorDecision._tag) {
+        case ChildExecutorDecisionOpCodes.OP_CONTINUE:
+          {
+            break;
+          }
+        case ChildExecutorDecisionOpCodes.OP_CLOSE:
+          {
+            this.finishWithDoneValue(childExecutor, parentSubexecutor, childExecutorDecision.value);
+            break;
+          }
+        case ChildExecutorDecisionOpCodes.OP_YIELD:
+          {
+            const modifiedParent = parentSubexecutor.enqueuePullFromChild(subexecutor);
+            this.replaceSubexecutor(modifiedParent);
+            break;
+          }
+      }
+      this._activeSubexecutor = new Subexecutor.Emit(emitted, this._activeSubexecutor);
+      return undefined;
+    }, Exit.match({
+      onFailure: cause => {
+        const state = this.handleSubexecutorFailure(childExecutor, parentSubexecutor, cause);
+        return state === undefined ? undefined : ChannelState.effectOrUndefinedIgnored(state);
+      },
+      onSuccess: doneValue => {
+        this.finishWithDoneValue(childExecutor, parentSubexecutor, doneValue);
+        return undefined;
+      }
+    }));
+  }
+  finishWithDoneValue(childExecutor, parentSubexecutor, doneValue) {
+    const subexecutor = parentSubexecutor;
+    switch (subexecutor._tag) {
+      case Subexecutor.OP_PULL_FROM_UPSTREAM:
+        {
+          const modifiedParent = new Subexecutor.PullFromUpstream(subexecutor.upstreamExecutor, subexecutor.createChild, subexecutor.lastDone !== undefined ? subexecutor.combineChildResults(subexecutor.lastDone, doneValue) : doneValue, subexecutor.activeChildExecutors, subexecutor.combineChildResults, subexecutor.combineWithChildResult, subexecutor.onPull, subexecutor.onEmit);
+          this._closeLastSubstream = childExecutor.close(Exit.succeed(doneValue));
+          this.replaceSubexecutor(modifiedParent);
+          break;
+        }
+      case Subexecutor.OP_DRAIN_CHILD_EXECUTORS:
+        {
+          const modifiedParent = new Subexecutor.DrainChildExecutors(subexecutor.upstreamExecutor, subexecutor.lastDone !== undefined ? subexecutor.combineChildResults(subexecutor.lastDone, doneValue) : doneValue, subexecutor.activeChildExecutors, subexecutor.upstreamDone, subexecutor.combineChildResults, subexecutor.combineWithChildResult, subexecutor.onPull);
+          this._closeLastSubstream = childExecutor.close(Exit.succeed(doneValue));
+          this.replaceSubexecutor(modifiedParent);
+          break;
+        }
+      default:
+        {
+          break;
+        }
+    }
+  }
+  handleSubexecutorFailure(childExecutor, parentSubexecutor, cause) {
+    return this.finishSubexecutorWithCloseEffect(Exit.failCause(cause), exit => parentSubexecutor.close(exit), exit => childExecutor.close(exit));
+  }
+  pullFromUpstream(subexecutor) {
+    if (subexecutor.activeChildExecutors.length === 0) {
+      return this.performPullFromUpstream(subexecutor);
+    }
+    const activeChild = subexecutor.activeChildExecutors[0];
+    const parentSubexecutor = new Subexecutor.PullFromUpstream(subexecutor.upstreamExecutor, subexecutor.createChild, subexecutor.lastDone, subexecutor.activeChildExecutors.slice(1), subexecutor.combineChildResults, subexecutor.combineWithChildResult, subexecutor.onPull, subexecutor.onEmit);
+    if (activeChild === undefined) {
+      return this.performPullFromUpstream(parentSubexecutor);
+    }
+    this.replaceSubexecutor(new Subexecutor.PullFromChild(activeChild.childExecutor, parentSubexecutor, activeChild.onEmit));
+    return undefined;
+  }
+  performPullFromUpstream(subexecutor) {
+    return ChannelState.Read(subexecutor.upstreamExecutor, effect => {
+      const closeLastSubstream = this._closeLastSubstream === undefined ? Effect.void : this._closeLastSubstream;
+      this._closeLastSubstream = undefined;
+      return pipe(this._executeCloseLastSubstream(closeLastSubstream), Effect.zipRight(effect));
+    }, emitted => {
+      if (this._closeLastSubstream !== undefined) {
+        const closeLastSubstream = this._closeLastSubstream;
+        this._closeLastSubstream = undefined;
+        return pipe(this._executeCloseLastSubstream(closeLastSubstream), Effect.map(() => {
+          const childExecutor = new ChannelExecutor(subexecutor.createChild(emitted), this._providedEnv, this._executeCloseLastSubstream);
+          childExecutor._input = this._input;
+          const [emitSeparator, updatedChildExecutors] = this.applyUpstreamPullStrategy(false, subexecutor.activeChildExecutors, subexecutor.onPull(upstreamPullRequest.Pulled(emitted)));
+          this._activeSubexecutor = new Subexecutor.PullFromChild(childExecutor, new Subexecutor.PullFromUpstream(subexecutor.upstreamExecutor, subexecutor.createChild, subexecutor.lastDone, updatedChildExecutors, subexecutor.combineChildResults, subexecutor.combineWithChildResult, subexecutor.onPull, subexecutor.onEmit), subexecutor.onEmit);
+          if (Option.isSome(emitSeparator)) {
+            this._activeSubexecutor = new Subexecutor.Emit(emitSeparator.value, this._activeSubexecutor);
+          }
+          return undefined;
+        }));
+      }
+      const childExecutor = new ChannelExecutor(subexecutor.createChild(emitted), this._providedEnv, this._executeCloseLastSubstream);
+      childExecutor._input = this._input;
+      const [emitSeparator, updatedChildExecutors] = this.applyUpstreamPullStrategy(false, subexecutor.activeChildExecutors, subexecutor.onPull(upstreamPullRequest.Pulled(emitted)));
+      this._activeSubexecutor = new Subexecutor.PullFromChild(childExecutor, new Subexecutor.PullFromUpstream(subexecutor.upstreamExecutor, subexecutor.createChild, subexecutor.lastDone, updatedChildExecutors, subexecutor.combineChildResults, subexecutor.combineWithChildResult, subexecutor.onPull, subexecutor.onEmit), subexecutor.onEmit);
+      if (Option.isSome(emitSeparator)) {
+        this._activeSubexecutor = new Subexecutor.Emit(emitSeparator.value, this._activeSubexecutor);
+      }
+      return undefined;
+    }, exit => {
+      if (subexecutor.activeChildExecutors.some(subexecutor => subexecutor !== undefined)) {
+        const drain = new Subexecutor.DrainChildExecutors(subexecutor.upstreamExecutor, subexecutor.lastDone, [undefined, ...subexecutor.activeChildExecutors], subexecutor.upstreamExecutor.getDone(), subexecutor.combineChildResults, subexecutor.combineWithChildResult, subexecutor.onPull);
+        if (this._closeLastSubstream !== undefined) {
+          const closeLastSubstream = this._closeLastSubstream;
+          this._closeLastSubstream = undefined;
+          return pipe(this._executeCloseLastSubstream(closeLastSubstream), Effect.map(() => this.replaceSubexecutor(drain)));
+        }
+        this.replaceSubexecutor(drain);
+        return undefined;
+      }
+      const closeLastSubstream = this._closeLastSubstream;
+      const state = this.finishSubexecutorWithCloseEffect(pipe(exit, Exit.map(a => subexecutor.combineWithChildResult(subexecutor.lastDone, a))), () => closeLastSubstream, exit => subexecutor.upstreamExecutor.close(exit));
+      return state === undefined ? undefined :
+      // NOTE: assuming finalizers cannot fail
+      ChannelState.effectOrUndefinedIgnored(state);
+    });
+  }
+  drainChildExecutors(subexecutor) {
+    if (subexecutor.activeChildExecutors.length === 0) {
+      const lastClose = this._closeLastSubstream;
+      if (lastClose !== undefined) {
+        this.addFinalizer(() => Effect.succeed(lastClose));
+      }
+      return this.finishSubexecutorWithCloseEffect(subexecutor.upstreamDone, () => lastClose, exit => subexecutor.upstreamExecutor.close(exit));
+    }
+    const activeChild = subexecutor.activeChildExecutors[0];
+    const rest = subexecutor.activeChildExecutors.slice(1);
+    if (activeChild === undefined) {
+      const [emitSeparator, remainingExecutors] = this.applyUpstreamPullStrategy(true, rest, subexecutor.onPull(upstreamPullRequest.NoUpstream(rest.reduce((n, curr) => curr !== undefined ? n + 1 : n, 0))));
+      this.replaceSubexecutor(new Subexecutor.DrainChildExecutors(subexecutor.upstreamExecutor, subexecutor.lastDone, remainingExecutors, subexecutor.upstreamDone, subexecutor.combineChildResults, subexecutor.combineWithChildResult, subexecutor.onPull));
+      if (Option.isSome(emitSeparator)) {
+        this._emitted = emitSeparator.value;
+        return ChannelState.Emit();
+      }
+      return undefined;
+    }
+    const parentSubexecutor = new Subexecutor.DrainChildExecutors(subexecutor.upstreamExecutor, subexecutor.lastDone, rest, subexecutor.upstreamDone, subexecutor.combineChildResults, subexecutor.combineWithChildResult, subexecutor.onPull);
+    this.replaceSubexecutor(new Subexecutor.PullFromChild(activeChild.childExecutor, parentSubexecutor, activeChild.onEmit));
+    return undefined;
+  }
+}
+const ifNotNull = effect => effect !== undefined ? effect : Effect.void;
+const runFinalizers = (finalizers, exit) => {
+  return pipe(Effect.forEach(finalizers, fin => Effect.exit(fin(exit))), Effect.map(exits => pipe(Exit.all(exits), Option.getOrElse(() => Exit.void))), Effect.flatMap(exit => Effect.suspend(() => exit)));
+};
+/**
+ * @internal
+ */
+export const readUpstream = (r, onSuccess, onFailure) => {
+  const readStack = [r];
+  const read = () => {
+    const current = readStack.pop();
+    if (current === undefined || current.upstream === undefined) {
+      return Effect.dieMessage("Unexpected end of input for channel execution");
+    }
+    const state = current.upstream.run();
+    switch (state._tag) {
+      case ChannelStateOpCodes.OP_EMIT:
+        {
+          const emitEffect = current.onEmit(current.upstream.getEmit());
+          if (readStack.length === 0) {
+            if (emitEffect === undefined) {
+              return Effect.suspend(onSuccess);
+            }
+            return pipe(emitEffect, Effect.matchCauseEffect({
+              onFailure,
+              onSuccess
+            }));
+          }
+          if (emitEffect === undefined) {
+            return Effect.suspend(() => read());
+          }
+          return pipe(emitEffect, Effect.matchCauseEffect({
+            onFailure,
+            onSuccess: () => read()
+          }));
+        }
+      case ChannelStateOpCodes.OP_DONE:
+        {
+          const doneEffect = current.onDone(current.upstream.getDone());
+          if (readStack.length === 0) {
+            if (doneEffect === undefined) {
+              return Effect.suspend(onSuccess);
+            }
+            return pipe(doneEffect, Effect.matchCauseEffect({
+              onFailure,
+              onSuccess
+            }));
+          }
+          if (doneEffect === undefined) {
+            return Effect.suspend(() => read());
+          }
+          return pipe(doneEffect, Effect.matchCauseEffect({
+            onFailure,
+            onSuccess: () => read()
+          }));
+        }
+      case ChannelStateOpCodes.OP_FROM_EFFECT:
+        {
+          readStack.push(current);
+          return pipe(current.onEffect(state.effect), Effect.catchAllCause(cause => Effect.suspend(() => {
+            const doneEffect = current.onDone(Exit.failCause(cause));
+            return doneEffect === undefined ? Effect.void : doneEffect;
+          })), Effect.matchCauseEffect({
+            onFailure,
+            onSuccess: () => read()
+          }));
+        }
+      case ChannelStateOpCodes.OP_READ:
+        {
+          readStack.push(current);
+          readStack.push(state);
+          return Effect.suspend(() => read());
+        }
+    }
+  };
+  return read();
+};
+/** @internal */
+export const runIn = /*#__PURE__*/dual(2, (self, scope) => {
+  const run = (channelDeferred, scopeDeferred, scope) => Effect.acquireUseRelease(Effect.sync(() => new ChannelExecutor(self, void 0, identity)), exec => Effect.suspend(() => runScopedInterpret(exec.run(), exec).pipe(Effect.intoDeferred(channelDeferred), Effect.zipRight(Deferred.await(channelDeferred)), Effect.zipLeft(Deferred.await(scopeDeferred)))), (exec, exit) => {
+    const finalize = exec.close(exit);
+    if (finalize === undefined) {
+      return Effect.void;
+    }
+    return Effect.tapErrorCause(finalize, cause => Scope.addFinalizer(scope, Effect.failCause(cause)));
+  });
+  return Effect.uninterruptibleMask(restore => Effect.all([Scope.fork(scope, ExecutionStrategy.sequential), Deferred.make(), Deferred.make()]).pipe(Effect.flatMap(([child, channelDeferred, scopeDeferred]) => restore(run(channelDeferred, scopeDeferred, child)).pipe(Effect.forkIn(scope), Effect.flatMap(fiber => scope.addFinalizer(exit => {
+    const interruptors = Exit.isFailure(exit) ? Cause.interruptors(exit.cause) : undefined;
+    return Deferred.isDone(channelDeferred).pipe(Effect.flatMap(isDone => isDone ? Deferred.succeed(scopeDeferred, void 0).pipe(Effect.zipRight(Fiber.await(fiber)), Effect.zipRight(Fiber.inheritAll(fiber))) : Deferred.succeed(scopeDeferred, void 0).pipe(Effect.zipRight(interruptors && HashSet.size(interruptors) > 0 ? Fiber.interruptAs(fiber, FiberId.combineAll(interruptors)) : Fiber.interrupt(fiber)), Effect.zipRight(Fiber.inheritAll(fiber)))));
+  }).pipe(Effect.zipRight(restore(Deferred.await(channelDeferred)))))))));
+});
+/** @internal */
+const runScopedInterpret = (channelState, exec) => {
+  const op = channelState;
+  switch (op._tag) {
+    case ChannelStateOpCodes.OP_FROM_EFFECT:
+      {
+        return pipe(op.effect, Effect.flatMap(() => runScopedInterpret(exec.run(), exec)));
+      }
+    case ChannelStateOpCodes.OP_EMIT:
+      {
+        // Can't really happen because Out <:< Nothing. So just skip ahead.
+        return runScopedInterpret(exec.run(), exec);
+      }
+    case ChannelStateOpCodes.OP_DONE:
+      {
+        return Effect.suspend(() => exec.getDone());
+      }
+    case ChannelStateOpCodes.OP_READ:
+      {
+        return readUpstream(op, () => runScopedInterpret(exec.run(), exec), Effect.failCause);
+      }
+  }
+};
+//# sourceMappingURL=channelExecutor.js.map