90 lines
3.7 KiB
Go
90 lines
3.7 KiB
Go
package addrs
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import (
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"strings"
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svchost "github.com/hashicorp/terraform-svchost"
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)
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// A ModulePackage represents a physical location where Terraform can retrieve
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// a module package, which is an archive, repository, or other similar
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// container which delivers the source code for one or more Terraform modules.
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//
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// A ModulePackage is a string in go-getter's address syntax. By convention,
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// we use ModulePackage-typed values only for the result of successfully
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// running the go-getter "detectors", which produces an address string which
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// includes an explicit installation method prefix along with an address
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// string in the format expected by that installation method.
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//
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// Note that although the "detector" phase of go-getter does do some simple
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// normalization in certain cases, it isn't generally possible to compare
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// two ModulePackage values to decide if they refer to the same package. Two
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// equal ModulePackage values represent the same package, but there might be
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// other non-equal ModulePackage values that also refer to that package, and
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// there is no reliable way to determine that.
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//
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// Don't convert a user-provided string directly to ModulePackage. Instead,
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// use ParseModuleSource with a remote module address and then access the
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// ModulePackage value from the result, making sure to also handle the
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// selected subdirectory if any. You should convert directly to ModulePackage
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// only for a string that is hard-coded into the program (e.g. in a unit test)
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// where you've ensured that it's already in the expected syntax.
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type ModulePackage string
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func (p ModulePackage) String() string {
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return string(p)
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}
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// A ModuleRegistryPackage is an extra indirection over a ModulePackage where
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// we use a module registry to translate a more symbolic address (and
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// associated version constraint given out of band) into a physical source
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// location.
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//
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// ModuleRegistryPackage is distinct from ModulePackage because they have
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// disjoint use-cases: registry package addresses are only used to query a
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// registry in order to find a real module package address. These being
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// distinct is intended to help future maintainers more easily follow the
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// series of steps in the module installer, with the help of the type checker.
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type ModuleRegistryPackage struct {
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Host svchost.Hostname
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Namespace string
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Name string
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TargetSystem string
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}
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func (s ModuleRegistryPackage) String() string {
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var buf strings.Builder
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// Note: we're using the "display" form of the hostname here because
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// for our service hostnames "for display" means something different:
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// it means to render non-ASCII characters directly as Unicode
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// characters, rather than using the "punycode" representation we
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// use for internal processing, and so the "display" representation
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// is actually what users would write in their configurations.
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return s.Host.ForDisplay() + "/" + s.ForRegistryProtocol()
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return buf.String()
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}
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func (s ModuleRegistryPackage) ForDisplay() string {
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if s.Host == DefaultModuleRegistryHost {
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return s.ForRegistryProtocol()
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}
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return s.Host.ForDisplay() + "/" + s.ForRegistryProtocol()
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}
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// ForRegistryProtocol returns a string representation of just the namespace,
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// name, and target system portions of the address, always omitting the
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// registry hostname and the subdirectory portion, if any.
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//
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// This is primarily intended for generating addresses to send to the
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// registry in question via the registry protocol, since the protocol
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// skips sending the registry its own hostname as part of identifiers.
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func (s ModuleRegistryPackage) ForRegistryProtocol() string {
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var buf strings.Builder
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buf.WriteString(s.Namespace)
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buf.WriteByte('/')
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buf.WriteString(s.Name)
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buf.WriteByte('/')
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buf.WriteString(s.TargetSystem)
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return buf.String()
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}
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