syntax = "proto3";

package wsman;

option go_package = "github.com/gitpod-io/gitpod/ws-manager/api";

import "content-service-api/initializer.proto";
import "google/protobuf/timestamp.proto";

service WorkspaceManager {
    // getWorkspaces produces a list of running workspaces and their status
    rpc GetWorkspaces(GetWorkspacesRequest) returns (GetWorkspacesResponse) {}

    // startWorkspace creates a new running workspace within the manager's cluster
    rpc StartWorkspace(StartWorkspaceRequest) returns (StartWorkspaceResponse) {}

    // stopWorkspace stops a running workspace
    rpc StopWorkspace(StopWorkspaceRequest) returns (StopWorkspaceResponse) {}

    // describeWorkspace investigates a workspace and returns its status, and configuration
    rpc DescribeWorkspace(DescribeWorkspaceRequest) returns (DescribeWorkspaceResponse) {}

    // subscribe streams all status updates to a client
    rpc Subscribe(SubscribeRequest) returns (stream SubscribeResponse) {}

    // markActive records a workspace as being active which prevents it from timing out
    rpc MarkActive(MarkActiveRequest) returns (MarkActiveResponse) {}
    
    // setTimeout changes the default timeout for a running workspace
    rpc SetTimeout(SetTimeoutRequest) returns (SetTimeoutResponse) {}

    // controlPort publicly exposes or un-exposes a network port for a workspace
    rpc ControlPort(ControlPortRequest) returns (ControlPortResponse) {}

    // takeSnapshot creates a copy of the workspace content which can initialize a new workspace.
    rpc TakeSnapshot(TakeSnapshotRequest) returns (TakeSnapshotResponse) {}

    // controlAdmission makes a workspace accessible for everyone or for the owner only
    rpc ControlAdmission(ControlAdmissionRequest) returns (ControlAdmissionResponse) {}
}

// GetWorkspacesRequest requests a list of running workspaces
message GetWorkspacesRequest {}

// GetWorkspacesResponse is the response to a get w
message GetWorkspacesResponse {
    // status are the status of all running workspaces
    repeated WorkspaceStatus status = 1;
}

// StartWorkspaceRequest requests that the workspace manager starts a workspace in its cluster
message StartWorkspaceRequest {
    // ID is a unique identifier of this workspace. No other workspace with the same name must be managed by this workspace manager
    string id = 1;

    // service_prefix is the unique ID/name that's prepended before the services associated with a workspace.
    // For example if the service_prefix is foobar there will be the services foobar-theia and foobar-ports.
    // If this field is empty the workspace ID becomes the service prefix.
    string service_prefix = 2;

    // Metadata is data associated with this workspace that's required for other parts of Gitpod to function
    WorkspaceMetadata metadata = 3;

    // Spec is the configuration of the workspace that's required for the ws-manager to start the workspace
    StartWorkspaceSpec spec = 4;

    // DEPRECATED bool headless = 5
    // see https://developers.google.com/protocol-buffers/docs/proto3#reserved reg. gRPC field deprecation
    reserved 5;

    // Type denots the kind of workspace we ought to start
    WorkspaceType type = 6;
}

message StartWorkspaceResponse {
    // URL is the external URL of the workspace
    string url = 1;
}

// StopWorkspaceRequest requests that the workspace manager stops a workspace
message StopWorkspaceRequest {
    // ID is the unique identifier of the workspace to stop
    string id = 1;

    // Policy determines how quickly a workspace will be stopped
    StopWorkspacePolicy policy = 2;
}

enum StopWorkspacePolicy {
    NORMALLY = 0;
    IMMEDIATELY = 1;
}

// StopWorkspaceResponse is the answer to a stop workspace request
message StopWorkspaceResponse {}

// DescribeWorkspaceRequest requests the status of a workspace
message DescribeWorkspaceRequest {
    // ID is the unique identifier of the workspace to describe
    string id = 1;
}

// DescribeWorkspaceResponse is the answer to a workspace description request
message DescribeWorkspaceResponse {
    WorkspaceStatus status = 1;

    // LastActivity is the time when the workspace was last marked active - ISO8601 formated
    string lastActivity = 2;
}

// SubscribeRequest requests to be notified whenever the workspace status changes
message SubscribeRequest {}

// SubscribeResponse notifies a client when a workspace's status changes
message SubscribeResponse {
    oneof payload {
        WorkspaceStatus status = 1;
        WorkspaceLogMessage log = 2;
    }
    
    map<string, string> header = 3;
}

// MarkActiveRequest marks a workspace as still in use
message MarkActiveRequest {
    // id is the ID of the workspace
    string id = 1;

    // closed marks a workspace as closed which will shorten its timeout
    bool closed = 2;
}

// MarkActiveResponse is the answer to a mark workspace active request
message MarkActiveResponse {}

// SetTimeoutRequest configures the timeout of a workspace
message SetTimeoutRequest {
    // id is the ID of the workspace
    string id = 1;

    // duration is the new timeout duration. Must be a valid Go duration (see https://golang.org/pkg/time/#ParseDuration)
    string duration = 2;
}

// SetTimeoutResponse is the answer to a set timeout request
message SetTimeoutResponse {}

// ControlPortRequest exposes or un-exposes networking ports of a workspace
message ControlPortRequest {
    // ID is the unique identifier of the workspace whose port to control
    string id = 1;

    // expose controls whether to make the port publicly available or bar if from being accessible outside of the worksapce.
    // If true, the port will become publicly available, if false it will become inaccessible from outside the workspace.
    bool expose = 2;

    // spec defines the port under control
    PortSpec spec = 3;
}

// ControlPortResponse is the answer to a workspace port control request
message ControlPortResponse {}

// TakeSnapshotRequest creates a copy of the workspace content. This copy can be used to initialize a new workspace.
message TakeSnapshotRequest {
    // ID is the unique identifier of the workspace of which to take a snapshot
    string id = 1;
}

// TakeSnapshotResponse is the answer to a take snapshot request
message TakeSnapshotResponse {
    // URL is the location of the snapshot encoded such that it can be passed back to a snapshot initializer.
    string url = 1;
}

// ControlAdmissionRequest controls the admission of users to a workspace
message ControlAdmissionRequest {
    // ID is the unique identifier of the workspace whoose admission to control
    string id = 1;

    // level is the new workspace admission level
    AdmissionLevel level = 2;
}

message ControlAdmissionResponse {}

enum AdmissionLevel {
    // WORKSPACE_ADMIT_OWNER_ONLY means the workspace can only be accessed using the owner token
    ADMIT_OWNER_ONLY = 0;

    // WORKSPACE_ADMIT_EVERYONE means the workspace (including ports) can be accessed by everyone.
    ADMIT_EVERYONE = 1;
}

// WorkspaceStatus describes a workspace status
message WorkspaceStatus {
    // ID is the unique identifier of the workspace
    string id = 1;

    // Metadata is data associated with this workspace that's required for other parts of Gitpod to function
    WorkspaceMetadata metadata = 2;

    // Spec is the workspace spec during runtime
    WorkspaceSpec spec = 3;

    // the phase of a workspace is a simple, high-level summary of where the workspace is in its lifecycle
    WorkspacePhase phase = 4;

    // conditions detail the current state of the workspace
    WorkspaceConditions conditions = 5;

    // message is an optional human-readable message detailing the current phase
    string message = 6;

    // repo details the Git working copy status of the workspace.
    // Note: this is a best-effort field and more often than not will not be present. Its absence does not
    // indicate the absence of a working copy.
    contentservice.GitStatus repo = 7;

    // runtime contains information about the workspace's runtime environment
    WorkspaceRuntimeInfo runtime = 8;

    // auth provides authentication information about the workspace. This info is primarily used by ws-proxy.
    WorkspaceAuthentication auth = 9;
}

// WorkspaceSpec is the specification of a workspace at runtime
message WorkspaceSpec {
    // workspace_image is the name of the Docker image this workspace runs
    string workspace_image = 1;

    // ide_image is the name of the Docker image used as IDE
    string ide_image = 2;

    // headless marks this workspace a headless one - headless workspaces are not intended for users but for automation
    bool headless = 3;

    // URL is the external URL of the workspace
    string url = 4;

    // exposed_ports lists all ports which this workspace has exposed to the outside world
    repeated PortSpec exposed_ports = 5;

    // workspace type denotes what kind of workspace this is, e.g. if it's user-facing, prebuilding content or probing the service
    WorkspaceType type = 6;

    // The intervals in which a heartbeat must be received for the workspace not to time out
    string timeout = 7;
}

// PortSpec describes a networking port exposed on a workspace
message PortSpec {
    // port is the outward-facing port
    uint32 port = 1;

    // target is the inward-facing target port
    uint32 target = 2;

    // visibility defines the visibility of the port
    PortVisibility visibility = 3;

    // url is the public-facing URL this port is available at
    string url = 4;
}

// PortVisibility defines who may access a workspace port which is guarded by an authentication in the proxy
enum PortVisibility {
    // private (default) means the port is accessible by the workspace owner only, unless the workspace's admission is
    // set to everyone.
    PORT_VISIBILITY_PRIVATE = 0;

    // public means the port is accessible by everybody using the workspace port URL
    PORT_VISIBILITY_PUBLIC = 1;
}

// WorkspaceCondition gives more detailed information as to the state of the workspace. Which condition actually
// has a value depends on the phase the workspace is in.
message WorkspaceConditions {
    // failed contains the reason the workspace failed to operate. If this field is empty, the workspace has not failed.
    string failed = 1;

    // timeout contains the reason the workspace has timed out. If this field is empty, the workspace has not timed out.
    string timeout = 2;

    // pulling_images marks if the workspace is currently pulling its images. This condition can only be set during PhaseCreating
    WorkspaceConditionBool pulling_images = 3;

    // service_exists denotes if the workspace theia-/ports- services exist. This condition will be true if either of the two services exist.
    WorkspaceConditionBool service_exists = 4;

    // snapshot contains a snapshot URL if a snapshot was produced prior to shutting the workspace down. This condition is only used for headless workspaces.
    string snapshot = 5;

    // final_backup_complete determines if the last state of the workspace has been backed up to remote storage.
    // Once this is true, a new workspace with the same ID will be able to use this backup.
    WorkspaceConditionBool final_backup_complete = 6;

    // deployed indicates if a workspace container is currently deployed. If this condition is false, there is no means for the user to alter the workspace content.
    WorkspaceConditionBool deployed = 7;

    // network_not_ready indicates if a workspace container is currently experiencing a network problem.
    WorkspaceConditionBool network_not_ready = 8;

    // first_user_activity is the time when MarkActive was first called on the workspace
    google.protobuf.Timestamp first_user_activity = 9;
}

// WorkspaceConditionBool is a trinary bool: true/false/empty
enum WorkspaceConditionBool {
    FALSE = 0;
    TRUE = 1;
    EMPTY = 2;
}

// WorkspacePhase is a simple, high-level summary of where the workspace is in its lifecycle.
// The phase is not intended to be a comprehensive rollup of observations of the workspace state,
// nor is it intended to be a comprehensive state machine.
// (based on  https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#pod-phase)
enum WorkspacePhase {
    // Unknown indicates an issue within the workspace manager in that it cannot determine the actual phase of
    // a workspace. This phase is usually accompanied by an error.
    UNKNOWN = 0;

    // Pending means the workspace does not yet consume resources in the cluster, but rather is looking for
    // some space within the cluster. If for example the cluster needs to scale up to accomodate the
    // workspace, the workspace will be in Pending state until that happened.
    PENDING = 1;

    // Creating means the workspace is currently being created. That includes downloading the images required
    // to run the workspace over the network. The time spent in this phase varies widely and depends on the current
    // network speed, image size and cache states.
    CREATING = 2;

    // Initializing is the phase in which the workspace is executing the appropriate workspace initializer (e.g. Git
    // clone or backup download). After this phase one can expect the workspace to either be Running or Failed.
    INITIALIZING = 3;

    // Running means the workspace is able to actively perform work, either by serving a user through Theia,
    // or as a headless workspace.
    RUNNING = 4;

    // Interrupted is an exceptional state where the container should be running but is temporarily unavailable.
    // When in this state, we expect it to become running or stopping anytime soon.
    INTERRUPTED = 7;

    // Stopping means that the workspace is currently shutting down. It could go to stopped every moment.
    STOPPING = 5;

    // Stopped means the workspace ended regularly because it was shut down.
    STOPPED = 6;
}

// WorkspaceMetadata is data associated with a workspace that's required for other parts of the system to function
message WorkspaceMetadata {
    // owner is the ID of the Gitpod user to whom we'll bill this workspace and who we consider responsible for its content
    string owner = 1;

    // meta_id is the workspace ID of this currently running workspace instance on the "meta pool" side
    string meta_id = 2;

    // started_at is the time when this workspace was started. Consider this field read-only, i.e. setting in a request will have no effect.
    google.protobuf.Timestamp started_at = 3;
}

// WorkspaceRuntimeInfo details the workspace's runtime, e.g. executing system, node other information
// about the environment the workspace runs in. This information serves a diangostic purpose only and
// should not be directly acted upon.
message WorkspaceRuntimeInfo {
    // node_name is the name of the node the workspace runs on
    string node_name = 1;
}

// WorkspaceAuthentication contains authentication information used by ws-proxy to allow/deny access to
// workspaces and their ports.
message WorkspaceAuthentication {
    // Admission describes who can access the workspace and its ports.
    AdmissionLevel admission = 1;

    // Owner token is the token one needs to access the workspace. Its presence is checked by ws-proxy.
    string owner_token = 2;
}

// StartWorkspaceSpec specifies the configuration of a workspace for a workspace start
message StartWorkspaceSpec {
    // workspace_image is the Docker image name of the workspace container
    string workspace_image = 1;

    // ide_image is the Docker image name of the IDE image
    string ide_image = 2;

    // feature_flags provide a means for starting variants of workspaces (e.g. a privileged one)
    repeated WorkspaceFeatureFlag feature_flags = 3;

    // initializer configures how the workspace is to be initialized
    contentservice.WorkspaceInitializer initializer = 4;

    // ports is the set of ports which ought to be exposed to the internet
    repeated PortSpec ports = 5;

    // envvars are user-defined environment variables which ought to be available in the workspace
    repeated EnvironmentVariable envvars = 6;

    // checkout_location describes where the code has been checked out to
    string checkout_location = 7;

    // workspace_location describes where the workspace root of Theia will be
    string workspace_location = 8;

    // Git configures the Git user in the workspace
    GitSpec git = 9;

    // timeout optionally sets a custom workspace timeout
    string timeout = 10;

    // admission controlls who can access the workspace and its ports.
    AdmissionLevel admission = 11;
}

// WorkspaceFeatureFlag enable non-standard behaviour in workspaces
enum WorkspaceFeatureFlag {
    // NOOP feature flag is just here because I don't want privileged to be 0
    NOOP = 0;

    // Privileged workspaces allow users to become root
    PRIVILEGED = 1;

    // Was used for appplitools-specific workspace config (e.g., proxy + network restriction)
    // APPLITOOLS = 2;
    reserved 2;

    // RegistryFacade enables the image pull through the registry facade.
    // When this feature flag is set we do not mount Theia from the node but expect
    // it to be part of the image provided by the facade.
    REGISTRY_FACADE = 3;

    // FullWorkspaceBackup does away with the /workspace host mount. All workspace content lives
    // in the ephemeral container storage. We initlialize workspaces using content layer served by
    // the registry facade and back them up using regular "hardlink backups".
    //
    // This flag implies REGISTRY_FACADE
    FULL_WORKSPACE_BACKUP = 4;

    // FixedResources ensures this workspace is not subject to ws-daemon's dynamic resource limits.
    // In this sence it's akin to "guaranteed" (as compared to burstable) resources for workspaces.
    FIXED_RESOURCES = 5;

    // UserNamespace enables user namespace specific behaviour in the pod. It disables a host of 
    // security features and - for now - should be considered equivalent to PRIVILEGED.
    //
    // TODO(cw): update this comment when userns are more secure.
    USER_NAMESPACE = 6;
}

// GitSpec configures the Git available within the workspace
message GitSpec {
    // The Git username
    string username = 1;

    // The Git email address
    string email = 2;
}

// EnvironmentVariable describes an env var as key/value pair
message EnvironmentVariable {
    string name = 1;
    string value = 2;
}

// WorkspaceType specifies the purpose/use of a workspace. Different workspace types are handled differently by all parts of the system.
enum WorkspaceType {
    // Regular workspaces are your off-the-mill workspaces intended for users. They are directly user-facing and hence are most important.
    REGULAR = 0;

    // Prebuild workspaces are workspaces used to pre-build the content of other workspaces. They run headless and have no direct user-interaction.
    PREBUILD = 1;

    // Probe workspaces are used to perform end-to-end health checks on the system. They require little to no resources, run headless and never
    // interact with users directly.
    PROBE = 2;

    // Ghost workspaces are placeholders that pre-scale a cluster for faster workspace startup. They request the same amount of resources
    // as a regular workspace, but run no actual load. They're removed at will to make space for an actual workspace.
    GHOST = 3;
}

// HeadlessWorkspaceEvent is a log statement issued by a headless workspace
message WorkspaceLogMessage {
    // ID is the ID of the workspace this event eminated from
    string id = 1;

    // metadata is the workspace metadata
    WorkspaceMetadata metadata = 2;

    // Message is the payload associated with this event
    string message = 4;
}