go-ansible/docs/api-contract.md

API Contract

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Function and method coverage percentages below come from go test -coverprofile=/tmp/ansible.cover ./... run on 2026-03-23. Type rows list the tests that exercise or validate each type because Go coverage does not report percentages for type declarations. Exported variables are intentionally excluded because the task requested exported types, functions, and methods only.

Package ansible: Types

Name	Signature	Description	Test coverage
Playbook	type Playbook struct	Top-level playbook container for an inline list of plays.	No direct tests; parser tests work with []Play rather than Playbook.
Play	type Play struct	Declares play metadata, host targeting, vars, lifecycle task lists, roles, handlers, tags, and execution settings.	Exercised by parser_test.go playbook cases and executor_extra_test.go: TestParsePlaybookIter_Good.
RoleRef	type RoleRef struct	Represents a role reference, including string and map forms plus role-scoped vars, tags, and when.	Directly validated by types_test.go: TestRoleRef_UnmarshalYAML_*; also parsed in parser_test.go: TestParsePlaybook_Good_RoleRefs.
Task	type Task struct	Represents a task, including module selection, args, conditions, loops, block/rescue/always sections, includes, notify, and privilege controls.	Directly validated by types_test.go: TestTask_UnmarshalYAML_*; also exercised throughout parser_test.go and module dispatch tests.
LoopControl	type LoopControl struct	Configures loop variable names, labels, pauses, and extended loop metadata.	No dedicated tests; only reachable through Task.loop_control parsing.
TaskResult	type TaskResult struct	Standard task execution result with change/failure state, output streams, loop subresults, module data, and duration.	Directly validated by types_test.go: TestTaskResult_*; also used across executor and module tests.
Inventory	type Inventory struct	Root Ansible inventory object keyed under all.	Directly validated by types_test.go: TestInventory_UnmarshalYAML_Good_Complex; also exercised by parser and host-resolution tests.
InventoryGroup	type InventoryGroup struct	Inventory group containing hosts, child groups, and inherited vars.	Exercised by parser_test.go inventory and host-matching cases plus executor_extra_test.go: TestAllHostsIter_Good.
Host	type Host struct	Host-level connection settings plus inline custom vars.	Exercised by inventory parsing and host-var inheritance tests in types_test.go and parser_test.go.
Facts	type Facts struct	Captures gathered host facts such as identity, OS, kernel, memory, CPUs, and primary IPv4.	Directly validated by types_test.go: TestFacts_Struct; also exercised by fact resolution tests in modules_infra_test.go and executor_extra_test.go.
Parser	type Parser struct	Stateful YAML parser for playbooks, inventories, task files, and roles.	Directly exercised by parser_test.go: TestNewParser_Good and all parser method tests.
Executor	type Executor struct	Playbook execution engine holding parser/inventory state, callbacks, vars/results/facts, SSH clients, and run options.	Directly exercised by executor_test.go, executor_extra_test.go, and module tests; the public Run entrypoint itself is untested.
SSHClient	type SSHClient struct	Lazy SSH client that tracks connection, auth, privilege-escalation state, and timeout.	Constructor and become state are covered in ssh_test.go and modules_infra_test.go; network and file-transfer methods are untested.
SSHConfig	type SSHConfig struct	Public configuration for SSH connection, auth, become, and timeout defaults.	Directly exercised by ssh_test.go: TestNewSSHClient, TestSSHConfig_Defaults, and become-state tests in modules_infra_test.go.

Package ansible: Parser and Inventory API

Name	Signature	Description	Test coverage
(*RoleRef).UnmarshalYAML	func (r *RoleRef) UnmarshalYAML(unmarshal func(any) error) error	Accepts either a scalar role name or a structured role reference and normalises name into Role.	91.7%; covered by types_test.go: TestRoleRef_UnmarshalYAML_*.
(*Task).UnmarshalYAML	func (t *Task) UnmarshalYAML(node *yaml.Node) error	Decodes known task fields, extracts the module key dynamically, and converts with_items into Loop.	87.5%; covered by types_test.go: TestTask_UnmarshalYAML_*.
NewParser	func NewParser(basePath string) *Parser	Constructs a parser rooted at basePath with an empty variable map.	100.0%; covered by parser_test.go: TestNewParser_Good.
(*Parser).ParsePlaybook	func (p *Parser) ParsePlaybook(path string) ([]Play, error)	Reads a playbook YAML file into plays and post-processes each play's tasks.	90.0%; covered by parser_test.go: TestParsePlaybook_*.
(*Parser).ParsePlaybookIter	func (p *Parser) ParsePlaybookIter(path string) (iter.Seq[Play], error)	Wraps ParsePlaybook with an iterator over plays.	85.7%; covered by executor_extra_test.go: TestParsePlaybookIter_*.
(*Parser).ParseInventory	func (p *Parser) ParseInventory(path string) (*Inventory, error)	Reads an inventory YAML file into the public inventory model.	100.0%; covered by parser_test.go: TestParseInventory_*.
(*Parser).ParseTasks	func (p *Parser) ParseTasks(path string) ([]Task, error)	Reads a task file and extracts module metadata for each task.	90.0%; covered by parser_test.go: TestParseTasks_*.
(*Parser).ParseTasksIter	func (p *Parser) ParseTasksIter(path string) (iter.Seq[Task], error)	Wraps ParseTasks with an iterator over tasks.	85.7%; covered by executor_extra_test.go: TestParseTasksIter_*.
(*Parser).ParseRole	func (p *Parser) ParseRole(name string, tasksFrom string) ([]Task, error)	Resolves a role across several search paths, loads role defaults and vars, then parses the requested task file.	0.0%; no automated tests found.
NormalizeModule	func NormalizeModule(name string) string	Canonicalises short module names to ansible.builtin.* while leaving dotted names unchanged.	100.0%; covered by parser_test.go: TestNormalizeModule_*.
GetHosts	func GetHosts(inv *Inventory, pattern string) []string	Resolves all, localhost, group names, or explicit host names from inventory.	100.0%; covered by parser_test.go: TestGetHosts_*.
GetHostsIter	func GetHostsIter(inv *Inventory, pattern string) iter.Seq[string]	Iterator wrapper over GetHosts.	80.0%; covered by executor_extra_test.go: TestGetHostsIter_Good.
AllHostsIter	func AllHostsIter(group *InventoryGroup) iter.Seq[string]	Iterates every host in a group tree with deterministic key ordering.	84.6%; covered by executor_extra_test.go: TestAllHostsIter_*.
GetHostVars	func GetHostVars(inv *Inventory, hostname string) map[string]any	Collects effective variables for a host by merging group ancestry with host-specific connection vars and inline vars.	100.0%; covered by parser_test.go: TestGetHostVars_*.

Package ansible: Executor API

Name	Signature	Description	Test coverage
NewExecutor	func NewExecutor(basePath string) *Executor	Constructs an executor with parser state, variable stores, handler tracking, and SSH client cache.	100.0%; covered by executor_test.go: TestNewExecutor_Good.
(*Executor).SetInventory	func (e *Executor) SetInventory(path string) error	Loads inventory from disk via the embedded parser and stores it on the executor.	100.0%; covered by executor_extra_test.go: TestSetInventory_*.
(*Executor).SetInventoryDirect	func (e *Executor) SetInventoryDirect(inv *Inventory)	Replaces the executor inventory with a caller-supplied value.	100.0%; covered by executor_test.go: TestSetInventoryDirect_Good.
(*Executor).SetVar	func (e *Executor) SetVar(key string, value any)	Stores a variable in the executor-scoped variable map under lock.	100.0%; covered by executor_test.go: TestSetVar_Good.
(*Executor).Run	func (e *Executor) Run(ctx context.Context, playbookPath string) error	Parses a playbook and executes each play in order.	0.0%; no automated tests found for the public run path.
(*Executor).Close	func (e *Executor) Close()	Closes all cached SSH clients and resets the client cache.	80.0%; covered by executor_test.go: TestClose_Good_EmptyClients.
(*Executor).TemplateFile	func (e *Executor) TemplateFile(src, host string, task *Task) (string, error)	Reads a template, performs a basic Jinja2-to-Go-template conversion, and falls back to string substitution if parsing or execution fails.	75.0%; exercised indirectly by modules_file_test.go: TestModuleTemplate_*.

Package ansible: SSH API

Name	Signature	Description	Test coverage
NewSSHClient	func NewSSHClient(cfg SSHConfig) (*SSHClient, error)	Applies SSH defaults and constructs a client from the supplied config.	100.0%; covered by ssh_test.go: TestNewSSHClient, TestSSHConfig_Defaults, plus become-state tests in modules_infra_test.go.
(*SSHClient).Connect	func (c *SSHClient) Connect(ctx context.Context) error	Lazily establishes an SSH connection using key, password, and known_hosts handling.	0.0%; no automated tests found.
(*SSHClient).Close	func (c *SSHClient) Close() error	Closes the active SSH connection if one exists.	0.0%; no automated tests found.
(*SSHClient).Run	func (c *SSHClient) Run(ctx context.Context, cmd string) (stdout, stderr string, exitCode int, err error)	Executes a remote command, optionally wrapped with sudo, and returns streams plus exit code.	0.0%; no automated tests found for the concrete SSH implementation.
(*SSHClient).RunScript	func (c *SSHClient) RunScript(ctx context.Context, script string) (stdout, stderr string, exitCode int, err error)	Executes a remote shell script through a heredoc wrapper.	0.0%; no automated tests found.
(*SSHClient).Upload	func (c *SSHClient) Upload(ctx context.Context, local io.Reader, remote string, mode os.FileMode) error	Uploads content to a remote file, creating parent directories and handling sudo writes when needed.	0.0%; no automated tests found.
(*SSHClient).Download	func (c *SSHClient) Download(ctx context.Context, remote string) ([]byte, error)	Downloads a remote file by reading it with cat.	0.0%; no automated tests found.
(*SSHClient).FileExists	func (c *SSHClient) FileExists(ctx context.Context, path string) (bool, error)	Checks remote path existence with test -e.	0.0%; no automated tests found.
(*SSHClient).Stat	func (c *SSHClient) Stat(ctx context.Context, path string) (map[string]any, error)	Returns a minimal remote stat map describing existence and directory state.	0.0%; no automated tests found.
(*SSHClient).SetBecome	func (c *SSHClient) SetBecome(become bool, user, password string)	Updates the privilege-escalation settings stored on the client.	100.0%; covered by modules_infra_test.go: TestBecome_Infra_Good_*.

Package anscmd: CLI API

Name	Signature	Description	Test coverage
Register	func Register(c *core.Core)	Registers the ansible and ansible/test CLI commands and their flags on a core.Core instance.	0.0%; cmd/ansible has no test files.