Enable PHP feature flag configuration from the CDN

Cargo.toml

@@ -50,14 +50,14 @@ tracing-subscriber = ["tracing"]
 trigger_time_sample = ["profiling"]
 
 [dependencies]
-libdd-common = { path = "libdatadog/libdd-common", features = ["cgroup_testing"] }
+libdd-common = { path = "libdatadog/libdd-common", features = ["cgroup_testing", "hyper-proxy"] }
 libdd-common-ffi = { path = "libdatadog/libdd-common-ffi", default-features = false, features = ["std"] }
 libdd-telemetry = { path = "libdatadog/libdd-telemetry" }
 libdd-telemetry-ffi = { path = "libdatadog/libdd-telemetry-ffi", default-features = false }
 libdd-live-debugger = { path = "libdatadog/libdd-live-debugger" }
 libdd-live-debugger-ffi = { path = "libdatadog/libdd-live-debugger-ffi", default-features = false }
 libdd-ipc = { path = "libdatadog/libdd-ipc" }
-datadog-ffe = { package = "libdd-ffe", path = "libdatadog/libdd-ffe" }
+datadog-ffe = { package = "libdd-ffe", path = "libdatadog/libdd-ffe", features = ["cdn"] }
 libdd-remote-config = { path = "libdatadog/libdd-remote-config" }
 datadog-sidecar = { path = "libdatadog/datadog-sidecar" }
 datadog-sidecar-ffi = { path = "libdatadog/datadog-sidecar-ffi" }
@@ -87,7 +87,9 @@ tempfile = "3.3"
 tracing = { version = "0.1", default-features = false, features = ["std", "attributes"] }
 tracing-core = "0.1.32"
 tracing-subscriber = { version = "0.3", default-features = false, features = ["std", "fmt", "env-filter", "smallvec"] }
-serde_json = "1.0.113"
+tokio = { version = "1.36", features = ["macros", "rt", "sync", "time"] }
+tokio-util = "0.7.11"
+serde_json = { version = "1.0.113", features = ["raw_value"] }
 regex = "1.10.5"
 regex-automata = "0.4.5"
 http = "1.4"
@@ -217,6 +219,7 @@ hex = { version = "0.4", default-features = false }
 http = { version = "1.1", default-features = false }
 http-body = { version = "1", default-features = false }
 http-body-util = { version = "0.1", default-features = false }
+httpdate = { version = "1.0", default-features = false }
 # allow(workspace-deps-features): httpmock 0.8.0-alpha.1 does not compile
 # without the `cookies` feature: its own `readers.rs` calls `req.cookies()`
 # unconditionally while that method is gated behind `cookies`. Keep it as a
@@ -341,6 +344,8 @@ walkdir = { version = "2.4", default-features = false }
 wasm-bindgen-futures = { version = "0.4", default-features = false }
 wasm-bindgen-test = { version = "=0.3.50", default-features = false }
 web-time = { version = "1", default-features = false }
+webpki-roots = { version = "1.0.10", default-features = false }
+webpki-root-certs = { version = "1.0.10", default-features = false }
 windows = { version = "0.59.0", default-features = false }
 windows-sys = { version = "0.52", default-features = false }
 winver = { version = "1.0.0", default-features = false }

components-rs/common.h

@@ -293,6 +293,18 @@ typedef struct _zend_string _zend_string;
 
 #define ddog_DYANMIC_CONFIG_UPDATE_UNMODIFIED (_zend_string*)1
 
+#define ddog_DEFAULT_POLL_INTERVAL_SECONDS 30
+
+#define ddog_MAX_POLL_INTERVAL_SECONDS 3600
+
+#define ddog_DEFAULT_REQUEST_TIMEOUT_SECONDS 5
+
+#define ddog_MAX_REQUEST_TIMEOUT_SECONDS 300
+
+#define ddog_DEFAULT_INITIALIZATION_TIMEOUT_MS 10000
+
+#define ddog_MAX_INITIALIZATION_TIMEOUT_MS (int64_t)INT32_MAX
+
 #define ddog_LOG_ONCE (1 << 3)
 
 /**
@@ -317,6 +329,8 @@ typedef enum ddog_ConfigurationOrigin {
   DDOG_CONFIGURATION_ORIGIN_UNKNOWN,
 } ddog_ConfigurationOrigin;
 
+typedef uint8_t ddog_DeliveryState;
+
 typedef enum ddog_DynamicConfigUpdateMode {
   DDOG_DYNAMIC_CONFIG_UPDATE_MODE_READ,
   DDOG_DYNAMIC_CONFIG_UPDATE_MODE_READ_WRITE,
@@ -329,6 +343,12 @@ typedef enum ddog_EvaluateAt {
   DDOG_EVALUATE_AT_EXIT,
 } ddog_EvaluateAt;
 
+typedef enum ddog_FfeConfigurationSource {
+  DDOG_FFE_CONFIGURATION_SOURCE_DISABLED,
+  DDOG_FFE_CONFIGURATION_SOURCE_REMOTE_CONFIG,
+  DDOG_FFE_CONFIGURATION_SOURCE_AGENTLESS,
+} ddog_FfeConfigurationSource;
+
 typedef enum ddog_InBodyLocation {
   DDOG_IN_BODY_LOCATION_NONE,
   DDOG_IN_BODY_LOCATION_START,
@@ -466,6 +486,7 @@ typedef enum ddog_RemoteConfigProduct {
   DDOG_REMOTE_CONFIG_PRODUCT_LIVE_DEBUGGING,
   DDOG_REMOTE_CONFIG_PRODUCT_LIVE_DEBUGGING_SYMBOL_DB,
   DDOG_REMOTE_CONFIG_PRODUCT_DEBUG,
+  DDOG_REMOTE_CONFIG_PRODUCT_APM_PROFILING,
 } ddog_RemoteConfigProduct;
 
 typedef enum ddog_SpanProbeTarget {
@@ -549,6 +570,35 @@ typedef struct ddog_FfeAttribute {
   bool bool_value;
 } ddog_FfeAttribute;
 
+typedef struct ddog_FfeRuntimeConfig {
+  enum ddog_FfeConfigurationSource source;
+  bool enabled;
+  bool endpoint_valid;
+} ddog_FfeRuntimeConfig;
+
+/**
+ * Borrowed process settings. Strings are copied; credentials are never logged.
+ * The optional cleanup callback must remain valid until shutdown joins workers.
+ */
+typedef struct ddog_FfeSettingsInput {
+  bool enabled;
+  bool enabled_set;
+  ddog_CharSlice source;
+  bool source_set;
+  bool legacy_enabled;
+  bool legacy_enabled_set;
+  ddog_CharSlice agentless_base_url;
+  int64_t poll_interval_seconds;
+  int64_t request_timeout_seconds;
+  int64_t initialization_timeout_ms;
+  ddog_CharSlice site;
+  ddog_CharSlice api_key;
+  ddog_CharSlice environment;
+  bool sidecar_subprocess_enabled;
+  bool sidecar_self_telemetry;
+  void (*thread_cleanup)(void*);
+} ddog_FfeSettingsInput;
+
 /**
  * Flags selecting which Remote Config products/capabilities to subscribe to.
  *
@@ -1206,6 +1256,15 @@ typedef enum ddog_DynamicInstrumentationConfigState {
   DDOG_DYNAMIC_INSTRUMENTATION_CONFIG_STATE_NOT_SET,
 } ddog_DynamicInstrumentationConfigState;
 
+/**
+ * Controls whether an EVP client stays fixed to the Agent or opts into local
+ * discovery and direct-intake fallback.
+ */
+typedef enum ddog_EvpTransportMode {
+  DDOG_EVP_TRANSPORT_MODE_AGENT_ONLY,
+  DDOG_EVP_TRANSPORT_MODE_PREFER_LOCAL_THEN_DIRECT,
+} ddog_EvpTransportMode;
+
 typedef struct ddog_AgentRemoteConfigReader ddog_AgentRemoteConfigReader;
 
 typedef struct ddog_AgentRemoteConfigWriter_ShmHandle ddog_AgentRemoteConfigWriter_ShmHandle;
@@ -1267,12 +1326,29 @@ typedef struct ddog_TracerHeaderTags {
   bool client_computed_stats;
 } ddog_TracerHeaderTags;
 
+/**
+ * Logical tracer identity attached to EVP requests.
+ *
+ * Both fields must be non-empty, valid HTTP header values no longer than 256
+ * bytes. This identifies the producing SDK, not the sidecar transport.
+ */
+typedef struct ddog_EvpProducerIdentity {
+  ddog_CharSlice origin;
+  ddog_CharSlice version;
+} ddog_EvpProducerIdentity;
+
+/**
+ * C representation of the context attached to Feature Flags telemetry.
+ */
 typedef struct ddog_FfeTelemetryContext {
   ddog_CharSlice service;
   ddog_CharSlice env;
   ddog_CharSlice version;
 } ddog_FfeTelemetryContext;
 
+/**
+ * C representation of a Feature Flags exposure event.
+ */
 typedef struct ddog_FfeExposure {
   uint64_t timestamp_ms;
   ddog_CharSlice flag_key;
@@ -1301,6 +1377,9 @@ typedef struct ddog_Slice_FfeExposure {
    */
   uintptr_t len;
 } ddog_Slice_FfeExposure;
+/**
+ * C representation of a Feature Flags evaluation event.
+ */
 typedef struct ddog_FfeFlagEvaluation {
   int64_t timestamp_ms;
   ddog_CharSlice flag_key;
@@ -1339,6 +1418,9 @@ typedef struct ddog_Slice_FfeFlagEvaluation {
    */
   uintptr_t len;
 } ddog_Slice_FfeFlagEvaluation;
+/**
+ * C representation of a Feature Flags evaluation metric.
+ */
 typedef struct ddog_FfeEvaluationMetric {
   ddog_CharSlice flag_key;
   ddog_CharSlice variant;