in src/NuGet.Core/NuGet.Resolver/PackageResolver.cs [28:213]
public IEnumerable<PackageIdentity> Resolve(PackageResolverContext context, CancellationToken token)
{
var stopWatch = new Stopwatch();
token.ThrowIfCancellationRequested();
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
// validation
foreach (var requiredId in context.RequiredPackageIds)
{
if (!context.AvailablePackages.Any(p => StringComparer.OrdinalIgnoreCase.Equals(p.Id, requiredId)))
{
throw new NuGetResolverInputException(String.Format(CultureInfo.CurrentCulture, Strings.MissingDependencyInfo, requiredId));
}
}
var invalidExistingPackages = new List<string>();
var installedPackages = context.PackagesConfig.Select(p => p.PackageIdentity).ToArray();
// validate existing package.config for any invalid dependency
foreach (var package in installedPackages)
{
var existingPackage =
context.AvailablePackages.FirstOrDefault(
p =>
StringComparer.OrdinalIgnoreCase.Equals(p.Id, package.Id) &&
p.Version.Equals(package.Version));
if (existingPackage != null)
{
// check if each dependency can be satisfied with existing packages
var brokenDependencies = GetBrokenDependencies(existingPackage, installedPackages);
if (brokenDependencies != null && brokenDependencies.Any())
{
invalidExistingPackages.AddRange(brokenDependencies.Select(dependency => FormatDependencyConstraint(existingPackage, dependency)));
}
}
else
{
// check same package is being updated and we've a higher version then
// ignore logging warning for that.
existingPackage =
context.AvailablePackages.FirstOrDefault(
p =>
StringComparer.OrdinalIgnoreCase.Equals(p.Id, package.Id) &&
VersionComparer.Default.Compare(p.Version, package.Version) > 0);
if (existingPackage == null)
{
var packageString = $"'{package.Id} {package.Version.ToNormalizedString()}'";
invalidExistingPackages.Add(packageString);
}
}
}
// log warning message for all the invalid package dependencies
if (invalidExistingPackages.Count > 0)
{
context.Log.LogWarning(
string.Format(
CultureInfo.CurrentCulture, Strings.InvalidPackageConfig, string.Join(", ", invalidExistingPackages)));
}
// convert the available packages into ResolverPackages
var resolverPackages = new List<ResolverPackage>();
// pre-process the available packages to remove any packages that can't possibly form part of a solution
var availablePackages = RemoveImpossiblePackages(context.AvailablePackages, context.RequiredPackageIds);
foreach (var package in availablePackages)
{
IEnumerable<PackageDependency> dependencies = null;
// clear out the dependencies if the behavior is set to ignore
if (context.DependencyBehavior == DependencyBehavior.Ignore)
{
dependencies = Enumerable.Empty<PackageDependency>();
}
else
{
dependencies = package.Dependencies ?? Enumerable.Empty<PackageDependency>();
}
resolverPackages.Add(new ResolverPackage(package.Id, package.Version, dependencies, package.Listed, false));
}
// Sort the packages to make this process as deterministic as possible
resolverPackages.Sort(PackageIdentityComparer.Default);
// Keep track of the ids we have added
var groupsAdded = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
var grouped = new List<List<ResolverPackage>>();
// group the packages by id
foreach (var group in resolverPackages.GroupBy(e => e.Id, StringComparer.OrdinalIgnoreCase))
{
groupsAdded.Add(group.Key);
var curSet = group.ToList();
// add an absent package for non-targets
// being absent allows the resolver to throw it out if it is not needed
if (!context.RequiredPackageIds.Contains(group.Key, StringComparer.OrdinalIgnoreCase))
{
curSet.Add(new ResolverPackage(id: group.Key, version: null, dependencies: null, listed: true, absent: true));
}
grouped.Add(curSet);
}
// find all needed dependencies
var dependencyIds = resolverPackages.Where(e => e.Dependencies != null)
.SelectMany(e => e.Dependencies.Select(d => d.Id).Distinct(StringComparer.OrdinalIgnoreCase));
foreach (string depId in dependencyIds)
{
// packages which are unavailable need to be added as absent packages
// ex: if A -> B and B is not found anywhere in the source repositories we add B as absent
if (!groupsAdded.Contains(depId))
{
groupsAdded.Add(depId);
grouped.Add(new List<ResolverPackage>() { new ResolverPackage(id: depId, version: null, dependencies: null, listed: true, absent: true) });
}
}
token.ThrowIfCancellationRequested();
// keep track of the best partial solution
var bestSolution = Enumerable.Empty<ResolverPackage>();
Action<IEnumerable<ResolverPackage>> diagnosticOutput = (partialSolution) =>
{
// store each solution as they pass through.
// the combination solver verifies that the last one returned is the best
bestSolution = partialSolution;
};
// Run solver
var comparer = new ResolverComparer(context.DependencyBehavior, context.PreferredVersions, context.TargetIds);
var sortedGroups = ResolverInputSort.TreeFlatten(grouped, context);
var solution = CombinationSolver<ResolverPackage>.FindSolution(
groupedItems: sortedGroups,
itemSorter: comparer,
shouldRejectPairFunc: ResolverUtility.ShouldRejectPackagePair,
diagnosticOutput: diagnosticOutput);
// check if a solution was found
if (solution != null)
{
var nonAbsentCandidates = solution.Where(c => !c.Absent);
if (nonAbsentCandidates.Any())
{
// topologically sort non absent packages
var sortedSolution = ResolverUtility.TopologicalSort(nonAbsentCandidates);
// Find circular dependency for topologically sorted non absent packages since it will help maintain cache of
// already processed packages
var circularReferences = ResolverUtility.FindFirstCircularDependency(sortedSolution);
if (circularReferences.Any())
{
// the resolver is able to handle circular dependencies, however we should throw here to keep these from happening
throw new NuGetResolverConstraintException(
String.Format(CultureInfo.CurrentCulture, Strings.CircularDependencyDetected,
String.Join(" => ", circularReferences.Select(package => $"{package.Id} {package.Version.ToNormalizedString()}"))));
}
// solution found!
stopWatch.Stop();
context.Log.LogMinimal(
string.Format(CultureInfo.CurrentCulture, Strings.ResolverTotalTime, DatetimeUtility.ToReadableTimeFormat(stopWatch.Elapsed)));
return sortedSolution.ToArray();
}
}
// no solution was found, throw an error with a diagnostic message
var message = ResolverUtility.GetDiagnosticMessage(bestSolution, context.AvailablePackages, context.PackagesConfig, context.TargetIds, context.PackageSources);
throw new NuGetResolverConstraintException(message);
}