terraform: simplify semantic checks out into sep functions
This commit is contained in:
Mitchell Hashimoto
parent
9018beda81
commit
02fde14fb6
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@ -0,0 +1,134 @@
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package terraform
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import (
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"fmt"
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"strings"
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"github.com/hashicorp/terraform/config"
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)
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// smcProviders matches up the resources with a provider
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// those providers and does the initial `Configure` on the provider.
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func smcProviders(c *Config) (map[*config.Resource]ResourceProvider, []error) {
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var errs []error
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// Keep track of providers we know we couldn't instantiate so
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// that we don't get a ton of errors about the same provider.
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failures := make(map[string]struct{})
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// Go through each resource and match it up to a provider
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mapping := make(map[*config.Resource]ResourceProvider)
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providers := make(map[string]ResourceProvider)
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ResourceLoop:
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for _, r := range c.Config.Resources {
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// Find the prefixes that match this in the order of
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// longest matching first (most specific)
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prefixes := matchingPrefixes(r.Type, c.Providers)
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if len(prefixes) > 0 {
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if _, ok := failures[prefixes[0]]; ok {
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// We already failed this provider, meaning this
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// resource will never succeed, so just continue.
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continue
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}
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}
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// Go through each prefix and instantiate if necessary, then
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// verify if this provider is of use to us or not.
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var provider ResourceProvider = nil
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for _, prefix := range prefixes {
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// Initialize the provider
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p, ok := providers[prefix]
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if !ok {
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var err error
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p, err = c.Providers[prefix]()
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if err != nil {
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errs = append(errs, fmt.Errorf(
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"Error instantiating resource provider for "+
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"prefix %s: %s", prefix, err))
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// Record the error so that we don't check it again
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failures[prefix] = struct{}{}
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// Jump to the next resource
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continue ResourceLoop
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}
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providers[prefix] = p
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}
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// Test if this provider matches what we need
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if !ProviderSatisfies(p, r.Type) {
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continue
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}
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// A match! Set it and break
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provider = p
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break
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}
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if provider == nil {
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// We never found a matching provider.
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errs = append(errs, fmt.Errorf(
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"Provider for resource %s not found.",
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r.Id()))
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}
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mapping[r] = provider
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}
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if len(errs) > 0 {
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return nil, errs
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}
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return mapping, nil
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}
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// smcVariables does all the semantic checks to verify that the
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// variables given in the configuration to instantiate a Terraform
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// struct are valid.
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func smcVariables(c *Config) []error {
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var errs []error
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// Check that all required variables are present
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required := make(map[string]struct{})
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for k, v := range c.Config.Variables {
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if v.Required() {
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required[k] = struct{}{}
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}
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}
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for k, _ := range c.Variables {
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delete(required, k)
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}
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if len(required) > 0 {
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for k, _ := range required {
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errs = append(errs, fmt.Errorf(
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"Required variable not set: %s", k))
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}
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}
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// TODO(mitchellh): variables that are unknown
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return errs
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}
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// matchingPrefixes takes a resource type and a set of resource
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// providers we know about by prefix and returns a list of prefixes
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// that might be valid for that resource.
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//
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// The list returned is in the order that they should be attempted.
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func matchingPrefixes(
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t string,
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ps map[string]ResourceProviderFactory) []string {
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result := make([]string, 0, 1)
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for prefix, _ := range ps {
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if strings.HasPrefix(t, prefix) {
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result = append(result, prefix)
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}
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}
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// TODO(mitchellh): Order by longest prefix first
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return result
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}
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@ -2,7 +2,6 @@ package terraform
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import (
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"fmt"
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"strings"
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"sync"
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"github.com/hashicorp/terraform/config"
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@ -37,68 +36,14 @@ func New(c *Config) (*Terraform, error) {
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var errs []error
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// Validate that all required variables have values
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required := make(map[string]struct{})
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for k, v := range c.Config.Variables {
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if v.Required() {
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required[k] = struct{}{}
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}
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}
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for k, _ := range c.Variables {
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delete(required, k)
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}
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if len(required) > 0 {
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for k, _ := range required {
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errs = append(errs, fmt.Errorf(
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"Required variable not set: %s", k))
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}
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if err := smcVariables(c); err != nil {
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errs = append(errs, err...)
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}
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// TODO(mitchellh): variables that are unknown
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// Go through each resource and match it up to a provider
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mapping := make(map[*config.Resource]ResourceProvider)
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providers := make(map[string]ResourceProvider)
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for _, r := range c.Config.Resources {
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// Find the prefixes that match this in the order of
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// longest matching first (most specific)
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prefixes := matchingPrefixes(r.Type, c.Providers)
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// Go through each prefix and instantiate if necessary, then
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// verify if this provider is of use to us or not.
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var provider ResourceProvider = nil
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for _, prefix := range prefixes {
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p, ok := providers[prefix]
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if !ok {
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var err error
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p, err = c.Providers[prefix]()
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// Match all the resources with a provider and initialize the providers
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mapping, err := smcProviders(c)
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if err != nil {
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err = fmt.Errorf(
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"Error instantiating resource provider for "+
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"prefix %s: %s", prefix, err)
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return nil, err
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}
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providers[prefix] = p
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}
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// Test if this provider matches what we need
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if !ProviderSatisfies(p, r.Type) {
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continue
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}
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// A match! Set it and break
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provider = p
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break
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}
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if provider == nil {
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// We never found a matching provider.
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errs = append(errs, fmt.Errorf(
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"Provider for resource %s not found.",
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r.Id()))
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}
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mapping[r] = provider
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errs = append(errs, err...)
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}
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// Build the resource graph
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@ -203,23 +148,3 @@ func (t *Terraform) diffWalkFn(
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return nil
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}
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}
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// matchingPrefixes takes a resource type and a set of resource
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// providers we know about by prefix and returns a list of prefixes
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// that might be valid for that resource.
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//
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// The list returned is in the order that they should be attempted.
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func matchingPrefixes(
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t string,
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ps map[string]ResourceProviderFactory) []string {
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result := make([]string, 0, 1)
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for prefix, _ := range ps {
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if strings.HasPrefix(t, prefix) {
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result = append(result, prefix)
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}
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}
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// TODO(mitchellh): Order by longest prefix first
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return result
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}
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