terraform/plans/internal/planproto/planfile.proto

syntax = "proto3";
package tfplan;

// For Terraform's own parsing, the proto stub types go into an internal Go
// package. The public API is in github.com/hashicorp/terraform/plans/planfile .
option go_package = "github.com/hashicorp/terraform/plans/internal/planproto";

// Plan is the root message type for the tfplan file
message Plan {
    // Version is incremented whenever there is a breaking change to
    // the serialization format. Programs reading serialized plans should
    // verify that version is set to the expected value and abort processing
    // if not. A breaking change is any change that may cause an older
    // consumer to interpret the structure incorrectly. This number will
    // not be incremented if an existing consumer can either safely ignore
    // changes to the format or if an existing consumer would fail to process
    // the file for another message- or field-specific reason.
    uint64 version = 1;

    // The variables that were set when creating the plan. Each value is
    // a msgpack serialization of an HCL value.
    map<string, DynamicValue> variables = 2;

    // An unordered set of proposed changes to resources throughout the
    // configuration, including any nested modules. Use the address of
    // each resource to determine which module it belongs to.
    repeated ResourceInstanceChange resource_changes = 3;

    // An unordered set of proposed changes to outputs in the root module
    // of the configuration. This set also includes "no action" changes for
    // outputs that are not changing, as context for detecting inconsistencies
    // at apply time.
    repeated OutputChange output_changes = 4;

    // The version string for the Terraform binary that created this plan.
    string terraform_version = 14;

    // SHA256 digests of all of the provider plugin binaries that were used
    // in the creation of this plan.
    map<string, Hash> provider_hashes = 15;
}

// Action describes the type of action planned for an object.
// Not all action values are valid for all object types.
enum Action {
    NOOP = 0;
    CREATE = 1;
    READ = 2;
    UPDATE = 3;
    REPLACE = 4;
    DELETE = 5;
}

// Change represents a change made to some object, transforming it from an old
// state to a new state.
message Change {
    // Not all action values are valid for all object types. Consult
    // the documentation for any message that embeds Change.
    Action action = 1;

    // msgpack-encoded HCL values involved in the change.
    // - For update and replace, two values are provided that give the old and new values,
    //   respectively.
    // - For create, one value is provided that gives the new value to be created
    // - For delete, one value is provided that describes the value being deleted
    // - For read, two values are provided that give the prior value for this object
    //   (or null, if no prior value exists) and the value that was or will be read,
    //   respectively.
    // - For no-op, one value is provided that is left unmodified by this non-change.
    repeated DynamicValue values = 2;
}

message ResourceInstanceChange {
    // module_path is an address to the module that defined this resource.
    // module_path is omitted for resources in the root module. For descendent modules
    // it is a string like module.foo.module.bar as would be seen at the beginning of a
    // resource address. The format of this string is not yet frozen and so external
    // callers should treat it as an opaque key for filtering purposes.
    string module_path = 1;

    // mode is the resource mode.
    ResourceMode mode = 2;
    enum ResourceMode {
        managed = 0; // for "resource" blocks in configuration
        data = 1;    // for "data" blocks in configuration
    }

    // type is the resource type name, like "aws_instance".
    string type = 3;

    // name is the logical name of the resource as defined in configuration.
    // For example, in aws_instance.foo this would be "foo".
    string name = 4;

    // instance_key is either an integer index or a string key, depending on which iteration
    // attributes ("count" or "for_each") are being used for this resource. If none
    // are in use, this field is omitted.
    oneof instance_key {
        string str = 5;
        int64 int = 6;
    };

    // deposed_key, if set, indicates that this change applies to a deposed
    // object for the indicated instance with the given deposed key. If not
    // set, the change applies to the instance's current object.
    string deposed_key = 7;

    // Description of the proposed change. May use "create", "read", "update",
    // "replace" and "delete" actions. "no-op" changes are not currently used here
    // but consumers must accept and discard them to allow for future expansion.
    Change change = 8;

    // msgpack representation of an arbitrary object value provided by
    // the resource provider as additional context for the change. Must
    // be considered an opaque value for any consumer other than the
    // provider that generated it.
    DynamicValue private = 9;

    // An unordered set of paths that prompted the change action to be
    // "replace" rather than "update". Empty for any action other than
    // "replace".
    repeated Path required_replace = 10;
}

message OutputChange {
    // Name of the output as defined in the root module.
    string name = 1;

    // Description of the proposed change. May use "no-op", "create",
    // "update" and "delete" actions.
    Change change = 2;

    // Sensitive, if true, indicates that one or more of the values given
    // in "change" is sensitive and should not be shown directly in any
    // rendered plan.
    bool sensitive = 3;
}

// DynamicValue represents a value whose type is not decided until runtime,
// often based on schema information obtained from a plugin.
//
// At present dynamic values are always encoded as msgpack, with extension
// id 0 used to represent the special "unknown" value indicating results
// that won't be known until after apply.
//
// In future other serialization formats may be used, possibly with a
// transitional period of including both as separate attributes of this type.
// Consumers must ignore attributes they don't support and fail if no supported
// attribute is present. The top-level format version will not be incremented
// for changes to the set of dynamic serialization formats.
message DynamicValue {
    bytes msgpack = 1;
}

// Hash represents a hash value.
//
// At present hashes always use the SHA256 algorithm. In future other hash
// algorithms may be used, possibly with a transitional period of including
// both as separate attributes of this type. Consumers must ignore attributes
// they don't support and fail if no supported attribute is present. The
// top-level format version will not be incremented for changes to the set of
// hash algorithms.
message Hash {
    bytes sha256 = 1;
}

// Path represents a set of steps to traverse into a data structure. It is
// used to refer to a sub-structure within a dynamic data structure presented
// separately.
message Path {
    message Step {
        oneof selector {
            // Set "attribute_name" to represent looking up an attribute
            // in the current object value.
            string attribute_name = 1;

            // Set "element_key" to represent looking up an element in
            // an indexable collection type.
            DynamicValue element_key = 2;
        }
    }
    repeated Step steps = 1;
}